Best Flat and Low Slope Roofing Contractors for Commercial Buildings (2026)

The research in brief

CentiMark is the consensus leader for flat and low-slope commercial roofing in this 7-platform AI study, named by all seven platforms (100.0% share) at an average listed position of 1.86 and a best position of 1. Tecta America is the strongest alternative for buyers who want local execution backed by a national network, and Nations Roof is the leading choice for multi-site portfolios that need centralized national-account coordination. Baker Roofing Company is the strongest regional option for the Southeast and Mid-Atlantic, while North American Roofing, Flynn Group of Companies, Commercial Flat Roof Company, Roofing Corp of America, and Greenwood Industries serve narrower geographic or structural niches. Nine entities qualified from 31 unique names. The principal limitation: this study used one standardized prompt sent once to each platform, and most supporting citations are company-owned rather than independent.

Research Snapshot

• Topic: Flat and low-slope commercial roofing - installation, replacement, and lifecycle service for business buildings.
• Target buyer: A commercial property owner or manager who needs a flat or low-slope roof system installed or replaced on a business building.
• Platforms included (7): ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, Gemini.
• Research date: 2026-09-30 (authoritative run date).
• Unique entities named: 31.
• Qualifying entities: 9.
• Eligibility rule: Named by at least two platforms during ranking discovery.
• Ranking unit: Roofing contractor or company brand.
• Geography: United States.
• Research prompt: A single standardized prompt describing an aging, leaking flat commercial roof, a need for TPO/EPDM/modified-bitumen expertise, large-scale installation without long business shutdowns, code compliance, warranty coverage, and on-schedule commercial project management.

Platform mentions in this report count only platforms that named the entity during ranking discovery. All seven included platforms evaluated fit, but that is a separate measure and is never substituted for platform mentions.

The Consensus Ranking

Questions explored

• What are the best commercial roofing contractors for flat and low-slope commercial roofing in 2026?
• Which flat roofing contractor was named by the most AI platforms, and how often was each one recommended?

Which provider fits your needs?

Questions explored

• Which commercial roofing contractor should a buyer choose for a multi-site portfolio that needs one national point of contact?
• Is a national contractor or a regional specialist better for a single occupied commercial building that cannot shut down?
• Which flat roofing contractor is best for a buyer who needs a published, verifiable manufacturer warranty before bidding?

1. CentiMark

Questions explored

• Is CentiMark worth it for flat and low-slope commercial roofing, and what are its main drawbacks?
• Which commercial roofing contractor should a buyer choose if they need one warranty covering both workmanship and materials?

CentiMark is the only entity named by all seven platforms, and it is the consensus leader for large, occupied, or geographically distributed commercial flat-roof programs. Platforms consistently describe it as a full-service commercial contractor covering TPO, EPDM, modified bitumen, PVC, BUR, coatings, and SPF, with installation, reroofing, repair, inspection, maintenance, emergency service, and portfolio management under one roof ^[149]. The strongest differentiator across platforms is the Single Source Warranty, which CentiMark states covers both workmanship and materials and may be customizable, transferable, and extendable ^[165]. Anthropic reported a 20-year term with a possible 5-year extension tied to preventative maintenance, while Grok reported manufacturer warranties up to 30 years; these are platform-reported figures and the reviewed public pages do not include a complete standard warranty document ^[170].

Why it ranked here. CentiMark was named by 7 of 7 platforms at an average listed position of 1.86, with a best position of 1. It was ranked first by DeepSeek and second by the other six platforms. No other entity in this study was named by every platform.

Best suited for. Large or complex commercial reroofing and replacement; owners or managers of multiple buildings needing centralized roof records, condition assessments, budgeting, and project coordination; buyers seeking TPO, EPDM, modified bitumen, PVC, BUR, or other commercial low-slope systems; facilities requiring ongoing preventative maintenance, emergency response, and a single contractor for installation and service.

Main strengths for the use case. Broad low-slope system coverage; integrated replacement, repair, inspection, maintenance, emergency, and warranty services; a stated national footprint of more than 100 offices and more than 650 commercial roofing crews; portfolio-management tools with centralized documentation; a published replacement workflow covering inspection, design choices, permits, safety planning, materials, and construction; and a Single Source Warranty positioned as covering workmanship and materials ^[158]. Google also reported an ESOP ownership structure and top-tier manufacturer certifications including GAF Chairman's Circle, Carlisle Centurion, Firestone/Holcim Elevate, and Sika Sarnafil ^[255].

Main limitations. Detailed prices, warranty duration, exclusions, service-level commitments, and contract terms are not publicly standardized. The company's service and warranty claims are primarily self-reported on its website, and independent evidence of project outcomes, disruption levels, or comparative pricing was not established in the reviewed sources. Local office capabilities, crew availability, licensing, manufacturer certifications, emergency response times, and subcontractor use may vary by market. Warranty-related preventative maintenance requirements can create ongoing ownership costs and administrative obligations. Anthropic reported coverage in 32 of 50 U.S.

2. Tecta America

Questions explored

• Is Tecta America or CentiMark better for a large commercial reroof when local crew quality matters?
• Which commercial roofing contractor should a buyer choose if they need manufacturer-backed No Dollar Limit warranties?

Tecta America is the strongest alternative to CentiMark for buyers who want local execution backed by a national commercial-roofing network. It was named by 6 of 7 platforms at an average listed position of 2.33, with a best position of 1. Platforms describe a national network of local operating companies covering TPO, EPDM, PVC, modified bitumen, BUR, and related low-slope systems, with roof replacement, new construction, repair, maintenance, and roof asset management ^[26]. The most frequently cited differentiator is manufacturer certification depth - Anthropic and Google both reported certifications with Carlisle, GAF, Versico, Sika Sarnafil, and Johns Manville, which platforms linked to eligibility for No Dollar Limit (NDL) manufacturer warranties ^[257].

Why it ranked here. Tecta America was named by 6 of 7 platforms at an average listed position of 2.33, with a best position of 1. It was ranked first by Claude, Gemini, Grok, and Kimi, second by DeepSeek, and eighth by ChatGPT - the widest single-platform spread of any top-five entity.

Best suited for. Large commercial, industrial, institutional, education, healthcare, government, and multi-site properties; roof replacement or installation requiring TPO, EPDM, PVC, modified bitumen, BUR, or related low-slope systems; buyers wanting local execution backed by a national commercial-roofing network; owners seeking ongoing inspections, preventative maintenance, leak response, and roof-portfolio tracking.

Main strengths for the use case. Broad low-slope system coverage; a national network with local operating companies; documented commercial replacement work and formal project-management functions; maintenance, repair, inspection, and roof-portfolio-management services; and a stated 24/7 Customer Solutions Center with an average dispatch time under 9 minutes and emergency response of 4 hours or less, based on company-reported service data ^[200]. TectaTracker provides roof-condition records, deficiency reports, repair prioritization, budget forecasting, and remaining-service-life tracking ^[206].

Main limitations. Tecta America operates through local member companies, so capabilities, staffing, manufacturer approvals, service territory, pricing, and customer experience may differ by location. Public pricing and standardized contract terms are not available. NDL warranty availability and exact warranty terms were not verified from the reviewed sources. Public evidence is primarily company-controlled, and independent comparative evidence on quality, schedule adherence, disruption, and warranty claims was not verified. The sources do not establish guaranteed code compliance, completion dates, emergency response times, or uninterrupted operations ^[26].

Pricing or cost summary. No public commercial roof installation or replacement price schedule was verified. A project-specific quotation and site inspection should be expected.

3. Nations Roof

Questions explored

• Is Nations Roof worth it for a multi-site commercial portfolio that needs one national account manager?
• Which flat roofing contractor should a buyer choose if they need documented preventive maintenance tied to manufacturer warranty compliance?

Nations Roof is the leading choice in this index for multi-site portfolios that need centralized national-account coordination. It was named by 5 of 7 platforms at an average listed position of 3.40, with a best position of 3. Platforms describe a commercial-only contractor covering TPO, EPDM, PVC, modified bitumen, and built-up roofing, with a national account structure, a 24/7/365 National Service Center, dedicated account managers, and the RoofCare preventive maintenance program ^[183]. The most consistently cited differentiator is the combination of national-account management with documented maintenance reporting intended to keep manufacturer warranties valid ^[113].

Why it ranked here. Nations Roof was named by 5 of 7 platforms at an average listed position of 3.40, with a best position of 3. It was ranked third by Claude, Gemini, Kimi, and ChatGPT, and fifth by DeepSeek. It was not named by Grok or Perplexity during ranking discovery.

Best suited for. Multi-site commercial, industrial, warehouse, logistics, retail, healthcare, education, and government portfolios; large flat-roof replacement or re-roofing projects requiring coordinated project management; owners needing ongoing inspection, repair, preventive maintenance, and emergency-response support; projects involving TPO, EPDM, PVC, modified bitumen, built-up roofing, coatings, or manufacturer warranty coordination.

Main strengths for the use case. Commercial and industrial focus rather than primarily residential roofing; relevant experience with major low-slope systems; national account infrastructure suited to multi-location portfolios; a combination of replacement, repair, maintenance, inspections, emergency response, coatings, and solar-roof coordination; manufacturer-certificate and warranty-support claims with independent GAF GoldElite evidence for at least one Nations Roof entity; and reported national coverage, facility-portal familiarity, and FM Global experience ^[126]. Anthropic reported a self-performing team of 1,100+ professionals and a reported EMR of 0.59, with a third-party source citing 0.47 ^[224].

Main limitations. No public pricing or standardized commercial proposal terms were verified. Warranty coverage is system- and contract-specific, and company statements do not establish that every project receives a particular duration or a no-dollar-limit warranty. Claims about national coverage, crew count, EMR, certifications, and service consistency are primarily company-reported. Actual local branch performance, licensing, crew availability, schedule, and subcontractor use may vary. Public review and complaint evidence is not sufficiently uniform or entity-specific to predict outcomes for every location. No independently verified evidence was found quantifying reduced business disruption, completion-time performance, leak recurrence, or long-term lifecycle cost ^[183].

Pricing or cost summary. No publicly verified price schedule was found for commercial flat or low-slope replacement, re-roofing, repairs, or RoofCare.

4. Baker Roofing Company

Questions explored

• Is Baker Roofing Company worth it for a commercial reroof in the Carolinas or Southeast, and what are its main drawbacks?
• Which commercial roofing contractor should a buyer choose if they want self-performed crews instead of subcontracted labor?

Baker Roofing Company is the strongest regional option in this index for the Southeast and Mid-Atlantic. It was named by 5 of 7 platforms at an average listed position of 4.60, with a best position of 4. Platforms describe a commercial contractor covering TPO, EPDM, PVC, modified bitumen, BUR, and coatings, with self-performed employee-owner crews, manufacturer certifications, and preventive maintenance ^[21]. The most consistently cited differentiators are the self-performed crew model and the dual warranty structure - a stated 5-year workmanship warranty plus manufacturer coverage ^[2].

Why it ranked here. Baker Roofing Company was named by 5 of 7 platforms at an average listed position of 4.60, with a best position of 4. It was ranked fourth by Claude, DeepSeek, and Kimi, and fifth by Gemini. It was not named by Grok or Perplexity during ranking discovery.

Best suited for. Commercial building owners in the Carolinas, Southeast, or Mid-Atlantic needing TPO, EPDM, modified bitumen, BUR, PVC, or coating work; large or complex commercial reroofing and new-construction projects requiring organized project management and manufacturer warranty documentation; owners seeking installation, replacement, repair, restoration, and preventive-maintenance capabilities from one commercial contractor.

Main strengths for the use case. Broad published commercial low-slope system range; commercial installation, replacement, maintenance, repair, restoration, waterproofing, and coating capabilities; manufacturer-certification and warranty-documentation claims relevant to commercial owners; and regional scale that may support larger or multi-building Southeast and Mid-Atlantic projects. Google reported GAF PlatinumElite Commercial Contractor status enabling GAF Diamond Pledge NDL guarantees up to 35 years on qualifying systems, plus a Roof Assurance maintenance program covering scheduled inspections to meet manufacturer warranty requirements ^[281]. Anthropic reported 29 locations across eight states and 100% employee ownership as of 2025 ^[23].

Main limitations. No public project pricing or standard commercial contract terms. Warranty duration and coverage depend on the selected manufacturer, assembly, inspection, maintenance, and exclusions, and advertised maximums are not universal guarantees. Limited public detail on code engineering, permitting, schedule guarantees, occupied-building logistics, and business-disruption controls. Service footprint may not meet the needs of owners outside the Southeast and Mid-Atlantic. Grok rated the fit "mixed" specifically because of limited geographic scope and sparse independent verification ^[3].

Pricing or cost summary. No public commercial flat-roof installation, replacement, maintenance, or coating price schedule was identified.

5. North American Roofing

Questions explored

• Is North American Roofing worth it for a large commercial flat roof replacement, and what are its main drawbacks?
• Which commercial roofing contractor should a buyer choose if they want a tiered maintenance program that can extend a manufacturer warranty?

North American Roofing ranked fifth despite being named by only 2 of 7 platforms, because both platforms that named it placed it first. It has the highest average listed position in the entire index at 1.00. Platforms describe a commercial-only contractor since 1979 covering TPO, PVC, EPDM, modified bitumen, metal, and coatings, with the 360° Roof Program and StarCare maintenance tiers ^[93]. The most consistently cited differentiators are the tiered StarCare maintenance program and manufacturer certifications from GAF, Johns Manville, Carlisle SynTec, Elevate, FiberTite, and Sika Sarnafil ^[90].

Why it ranked here. North American Roofing was named by 2 of 7 platforms at an average listed position of 1.00, with a best position of 1. It was ranked first by both ChatGPT and Perplexity. Its low platform-mention count places it below entities named by more platforms, even though its average listed position is the best in the index.

Best suited for. Large commercial or industrial buildings requiring TPO, EPDM, PVC, modified bitumen, metal, or coating work; owners seeking one contractor for replacement, repair, emergency response, warranty support, and recurring maintenance; multi-site or portfolio owners that value centralized project coordination and condition reporting.

Main strengths for the use case. Broad stated coverage of the principal commercial flat and low-slope systems; commercial-only positioning and nationwide service claims that may suit large buildings and multi-site portfolios; replacement proposals that reportedly include condition documentation and value-engineering analysis; StarCare recurring inspections, reporting, preventative repairs, emergency access, and warranty-administration support; and manufacturer-certification and warranty-support claims that are potentially valuable where a specified manufacturer system is required ^[93]. Anthropic reported more than 1 billion square feet installed across more than 35,000 facilities since 1979, and StarCare Max extending manufacturer warranty to up to 30 years ^[108].

Main limitations. Public evidence is primarily company-owned, and independent evidence of workmanship, project outcomes, schedule performance, and warranty-claim handling is limited. No public replacement-price schedule was verified. Detailed code-compliance, permitting, engineering, phasing, safety, and occupied-building disruption procedures are not publicly specified. StarCare maintenance is expressly not a watertightness, structural, drainage, or general roof-performance guarantee. Nationwide service may involve mobilization or travel costs and does not establish that qualified crews are immediately available in every U.S. market. The company's public claims about installed square footage, years of experience, and manufacturer status were not independently validated in the reviewed sources ^[110].

Pricing or cost summary. No public installation or replacement price was verified.

6. Flynn Group of Companies

Questions explored

• Is Flynn Group of Companies worth it for a commercial flat roof replacement that also involves cladding or waterproofing?
• Which commercial roofing contractor should a buyer choose if they need a GAF Diamond Pledge NDL guarantee on a qualifying system?

Flynn Group of Companies ranked sixth, named by 2 of 7 platforms at an average listed position of 4.00, with a best position of 4. Platforms describe a North American commercial roofing and building-envelope contractor covering built-up roofing, modified bitumen, single-ply TPO, EPDM, and PVC, plus liquid-applied systems and metal roofing, with 24/7 emergency response and preventive maintenance ^[59]. The most consistently cited differentiator is total building-envelope capability - roofing combined with cladding, waterproofing, glazing, and architectural metals under one contractor ^[56].

Why it ranked here. Flynn Group of Companies was named by 2 of 7 platforms at an average listed position of 4.00, with a best position of 4. It was ranked fourth by both Gemini and ChatGPT. It was not named by Claude, DeepSeek, Grok, Perplexity, or Kimi during ranking discovery.

Best suited for. Large commercial, industrial, institutional, healthcare, education, government, and multi-building portfolios; roof replacement or retrofit projects requiring coordination with cladding, waterproofing, architectural metals, glazing, or other envelope scopes; owners needing recurring inspections, roof audits, preventive maintenance, and emergency leak response; projects in or near Flynn's established U.S. office markets.

Main strengths for the use case. Commercial-roofing focus and stated experience with TPO, EPDM, modified bitumen, single-ply, and multi-ply systems; replacement, repair, roof-audit, preventive-maintenance, and emergency-response capabilities; potentially useful total-building-envelope coordination for buildings with roof, wall, waterproofing, cladding, glazing, or architectural-metal interfaces; and multiple U.S. offices and service crews that may support larger or geographically distributed portfolios ^[56]. Google reported GAF PlatinumElite Commercial Contractor status enabling GAF Diamond Pledge NDL Roof Guarantees up to 35 years on qualifying flat roof designs, plus a proprietary digital Roof System Audit covering more than 20 points of roof health ^[258]. Anthropic reported NRCA and CRCA guideline adherence and membership ^[59].

Main limitations. No verified public pricing or standard U.S. contract terms. No verified standard warranty schedule for commercial roof replacement. No clearly documented public process for local code compliance, permitting, inspections, or engineering responsibility. Service availability, crew capacity, subcontractor use, and project-management quality may vary by branch. Public claims about cost savings, technical expertise, and disruption reduction are not independently substantiated in the reviewed sources. Anthropic reported employee reviews citing inconsistent management, poor office coordination, high turnover, and leadership quality concerns, with Glassdoor rating Flynn's Roofer position at 2.2 out of 5 stars, 41% below industry average ^[297].

Pricing or cost summary. No public standardized pricing was verified.

7. Commercial Flat Roof Company

Questions explored

• Is Commercial Flat Roof Company worth it for a commercial flat roof in St. Louis or Chicago, and what are its main drawbacks?
• Which commercial roofing contractor should a buyer choose if they want a labor-and-materials warranty rather than a materials-only manufacturer warranty?

Commercial Flat Roof Company ranked seventh, named by 2 of 7 platforms at an average listed position of 5.50, with a best position of 5. Platforms describe a regional commercial and industrial flat-roof specialist covering TPO, EPDM, PVC, modified bitumen, built-up roofing, coatings, repair, restoration, and replacement in the St. Louis and Chicago metropolitan areas ^[32]. The most consistently cited differentiator is the advertised labor-and-materials warranty structure, which platforms contrasted with manufacturer warranties that cover materials only ^[45].

Why it ranked here. Commercial Flat Roof Company was named by 2 of 7 platforms at an average listed position of 5.50, with a best position of 5. It was ranked fifth by Claude and sixth by Perplexity. It was not named by ChatGPT, DeepSeek, Grok, Kimi, or Gemini during ranking discovery.

Best suited for. Commercial and industrial buildings in the St. Louis or Chicago service regions; owners needing repair, restoration, coating, emergency response, or replacement of TPO, EPDM, modified-bitumen, built-up, or metal roofing systems; projects where a local contractor offering a site evaluation and lifecycle roofing services is preferred.

Main strengths for the use case. Narrow commercial and industrial flat-roof positioning; advertised coverage of TPO, EPDM, modified bitumen, built-up, PVC, metal, restoration, coatings, repair, replacement, and maintenance; relevant published case-study roof sizes including 42,650 square feet and 14,400 square feet; free evaluation and advertised emergency availability; and local presence and stated service coverage in the St. Louis and Chicago metropolitan areas ^[32]. Anthropic reported a 4.9-star rating across 149 customer reviews with positive feedback emphasizing responsive communication, professionalism, and owner involvement ^[320]. Google reported GAF commercial contractor certification and A+ BBB accreditation ^[144].

Main limitations. Not a nationwide option based on the published service areas. No publicly posted pricing or detailed commercial contract terms. Warranty claims are inconsistent across public pages and require written clarification. Code-compliance procedures, manufacturer certifications, insurance limits, bonding, safety record, and project-management controls are not sufficiently documented in the reviewed sources. Minimal disruption is a company claim, and supporting schedules, phasing plans, and independent outcomes were not found. Kimi rated the fit uncertain, stating that the entity identity could not be independently verified from similarly named competitors and directories, and that no crawlable website content was retrieved in that research pass ^[32].

Pricing or cost summary. No public price list or binding estimate was found.

8. Roofing Corp of America

Questions explored

• Is Roofing Corp of America worth it for a commercial reroof, and what are the risks of its affiliate network model?
• Which commercial roofing contractor should a buyer choose if they want a lifecycle maintenance program covering multiple U.S. markets?

Roofing Corp of America ranked eighth, named by 2 of 7 platforms at an average listed position of 5.50, with a best position of 5. Platforms describe a commercial roofing platform operating through acquired regional affiliate companies, covering TPO, PVC, EPDM, modified bitumen, and built-up roofing, with the RoofAdvantage 360 lifecycle program including Defend 360 maintenance, Respond 360 emergency leak repair, and Restore 360 repairs ^[192]. The most consistently cited differentiator is the multi-market affiliate network combined with a structured lifecycle maintenance program ^[190].

Why it ranked here. Roofing Corp of America was named by 2 of 7 platforms at an average listed position of 5.50, with a best position of 5. It was ranked fifth by ChatGPT and sixth by Gemini. It was not named by Claude, DeepSeek, Grok, Perplexity, or Kimi during ranking discovery.

Best suited for. Commercial building owners needing reroofing or replacement across common low-slope membrane and asphaltic systems; multi-site or multi-market property managers that may benefit from RCA's affiliate network and RoofAdvantage 360 maintenance structure; occupied commercial buildings where documented project management and HVAC/occupant protection are important.

Main strengths for the use case. Published coverage of TPO, PVC, EPDM, modified bitumen, and built-up roofing; published commercial reroofing, new-construction, repair, and maintenance capabilities; claims of project management, code-related planning, manufacturer installation certifications, and occupant/HVAC protection; RoofAdvantage 360 offering a stated preventive-maintenance, emergency-response, and repair/lifecycle framework; and a reported U.S. affiliate network that may help multi-location property managers ^[192]. Anthropic reported that one RCA partner, AAA Roofing, holds GAF GoldElite certification enabling up to 25-year NDL warranties on qualifying systems, and that Davco Roofing is certified by every major roofing manufacturer ^[283]. Google reported that RCA is a subsidiary of FirstService Corporation and operates through regional sister brands ^[176].

Main limitations. No public project pricing or standardized commercial service rates. No verified warranty schedule, workmanship warranty, manufacturer list, or warranty exclusions for the proposed project. Affiliate-level capabilities, licensing, insurance, references, staffing, and geographic coverage must be verified locally. No independently verified data was found for schedule adherence, business disruption, leak rates, or warranty claims. The recommended label "RCA Commercial Flat Roof Installation & Defend 360" combines installation with a maintenance program, and the official page presents Defend 360 as maintenance rather than installation. Entity and domain identity also conflicted: the supplied entity is associated with roofingcorp.com, while roofcorp.com is a separate-looking commercial roofing website ^[336].

9. Greenwood Industries

Questions explored

• Is Greenwood Industries worth it for a Northeast commercial flat roof replacement, and what are its main drawbacks?
• Which commercial roofing contractor should a buyer choose if they need roofing plus waterproofing, masonry, and architectural metal work from one contractor?

Greenwood Industries ranked ninth, named by 2 of 7 platforms at an average listed position of 7.50, with a best position of 7. Platforms describe a Northeast commercial roofing and building-envelope contractor covering EPDM, TPO/PVC, modified bitumen, built-up, and metal systems, with the Greenwood Performance Advantage maintenance program and 24/7 emergency response ^[78]. The most consistently cited differentiator is the combination of roofing with broader building-envelope services including waterproofing, masonry, architectural metal, and safety systems ^[78].

Why it ranked here. Greenwood Industries was named by 2 of 7 platforms at an average listed position of 7.50, with a best position of 7. It was ranked seventh by ChatGPT and eighth by Gemini. It was not named by Claude, DeepSeek, Grok, Perplexity, or Kimi during ranking discovery.

Best suited for. Large commercial, institutional, municipal, university, corporate-campus, and multi-building properties in the Northeast; re-roofing, roof restoration, inspections, repairs, and planned maintenance for EPDM, TPO/PVC, modified bitumen, built-up, and related low-slope systems; owners seeking one contractor for roofing plus waterproofing, masonry, architectural metal, safety, and broader building-envelope work.

Main strengths for the use case. Published experience with the principal commercial low-slope systems relevant to the use case; integrated roofing and building-envelope capabilities that may simplify complex commercial projects; maintenance, inspection, emergency-response, and multi-building service offerings; and a potentially strong fit for large or technically complex Northeast properties ^[78]. Anthropic reported GAF Chairman's Circle and Platinum Elite Commercial Contractor status enabling GAF Diamond Pledge NDL Roof Guarantee coverage up to 35 years for qualifying systems, plus custom 2-, 5-, or 10-year warranties for restoration work ^[177]. Anthropic also reported a two-year Greenwood Performance Advantage program with annual inspections, drain cleaning, debris removal, minor repairs, and OSHA-oriented rooftop safety audits ^[84].

Main limitations. Public evidence is primarily company-published, and independent performance and customer-outcome evidence was not established. No public standardized pricing or complete warranty language was identified. The Northeast-centered footprint may make another contractor more practical elsewhere in the United States. Code-compliance processes, permitting scope, manufacturer-authorized status by project, and actual disruption controls require proposal-level verification. Restoration savings and warranty claims depend on roof condition and eligibility and should not be treated as guaranteed. Deepseek, Grok, and Kimi all rated the fit mixed or uncertain, citing limited independently verifiable information ^[62].

Pricing or cost summary. No public project prices, maintenance-plan prices, minimum charges, or standard commercial contract rates were identified. Greenwood appears to use building-specific proposals and customized maintenance plans.

What this study reveals

Questions explored

• What do AI platforms consistently say about how commercial flat roofing contractors price and warranty their work?
• Which commercial roofing contractors do AI platforms treat as national versus regional, and does that change the shortlist?

Three structural patterns emerge from the nine qualifying entities.

First, national scale and multi-site capability dominate the top of the ranking. The top four entities by platform mentions - CentiMark, Tecta America, Nations Roof, and Baker Roofing Company - all publish multi-location networks, portfolio or national-account programs, and centralized reporting. The five entities named by only two platforms each serve a narrower geography or a narrower structural role. This suggests platforms weight multi-site capability heavily for this use case, which matches the research prompt's emphasis on large-scale installation and business continuity.

Second, no qualifying entity publishes a standard price schedule. Every one of the nine entities is quote-based, and every platform that assessed pricing assigned low pricing confidence. The only concrete cost figures in the evidence are industry benchmarks, not contractor-specific rates. Buyers comparing on published price alone will find no basis for comparison among these nine.

Third, warranty structure is the clearest differentiator after scale. CentiMark's Single Source Warranty covering workmanship and materials, Baker Roofing's 5-year workmanship warranty plus manufacturer coverage, North American Roofing's StarCare tiers, and Greenwood's GAF Diamond Pledge NDL access are the most frequently cited warranty features.

Where the AI Platforms Agreed

Questions explored

• Which commercial roofing contractors do all AI platforms agree belong on a shortlist for flat and low-slope commercial roofing?

Platforms agreed on several points across the nine entities.

• CentiMark belongs at or near the top. All seven platforms named it, and six of seven ranked it first or second. No platform rated its fit below "good."
• TPO, EPDM, and modified bitumen are the core systems. Every entity with published system coverage lists these three, and platforms consistently treated them as the baseline requirement for this use case.
• Pricing is opaque across the category. Every platform that assessed pricing for any entity assigned low pricing confidence and noted that no standard price schedule is published.
• Warranty terms are not fully public. Platforms repeatedly flagged that warranty duration, exclusions, maintenance conditions, and claim procedures require direct verification for every entity.
• Code compliance responsibility is unclear. For CentiMark, Tecta America, Baker Roofing, North American Roofing, Flynn, Commercial Flat Roof Company, Roofing Corp of America, and Greenwood, at least one platform stated that project-specific code-compliance, permitting, or engineering responsibility was not clearly documented in public materials.
• Business-disruption claims are company-reported. No platform found independently verified disruption metrics, guaranteed phasing methods, or business-continuity outcomes for any entity.

Where the AI Platforms Disagreed

Questions explored

• Why do AI platforms disagree about which commercial roofing contractor is best, and which disagreements should change a buyer's shortlist?

Disagreements were material and are preserved here rather than smoothed into false consensus.

• Geographic coverage. CentiMark's coverage was reported as 32 of 50 states by Anthropic and as broader national coverage by other platforms. Tecta America's coverage was reported as 110+ locations in 30+ states by the company and as 25 of 50 states by an independent 2026 review. Nations Roof's coverage was reported as 40+ branches and 50-state project completion alongside a June 2026 analysis noting remaining gaps. Greenwood's location count ranged from 4 to 15 depending on source.
• Warranty terms. CentiMark's warranty was reported as 20 years with a 5-year maintenance extension by Anthropic and as manufacturer warranties up to 30 years by Grok. Baker Roofing's workmanship warranty was reported as 5 years by Anthropic and Perplexity and as 5 to 10 years depending on division by Google. Commercial Flat Roof Company's own pages conflict between 20-year, 25-year, and 1-to-5-year coverage.
• Fit ratings. For North American Roofing, Flynn, Roofing Corp of America, and Greenwood, at least one platform rated the fit "uncertain" while at least one other rated it "strong." These splits usually trace to whether the platform could retrieve and verify the entity's own website content during its research pass.

How to compare your options

Questions explored

• What should a buyer check before choosing a commercial roofing contractor for a flat or low-slope roof replacement?
• Which commercial roofing contractor should a buyer choose if they need to verify manufacturer certification and NDL warranty eligibility before bidding?

Start with geography, then scale, then warranty, then verification.

Step 1 - Confirm the contractor actually serves the property. CentiMark, Tecta America, and Nations Roof publish the broadest footprints, but each has coverage gaps. Baker Roofing serves the Southeast and Mid-Atlantic. Commercial Flat Roof Company serves St. Louis and Chicago. Greenwood serves the Northeast. Flynn serves specific U.S. metro markets. Roofing Corp of America serves markets where its affiliates operate. North American Roofing claims 49-state eligibility. Verify the specific branch, not the national brand.

Step 2 - Match contractor scale to portfolio scale. A single occupied building may be better served by a regional specialist with direct owner access. A multi-state portfolio is better served by an entity with a national-account structure, centralized reporting, and consistent warranty administration.

Step 3 - Require the warranty in writing before bidding. Ask which manufacturer, which assembly, which term, which exclusions, which maintenance obligations, and whether the warranty is manufacturer-backed or contractor-backed. For CentiMark, ask whether the Single Source Warranty is manufacturer-backed or self-insured. For Tecta America, ask whether NDL coverage is available through the specific local member company. For Nations Roof, ask whether the NDL warranty is manufacturer-registrable or contractor-backed.

Methodology

This index was produced from a single standardized research prompt sent once to each of seven AI platforms on the authoritative run date of 2026-09-30. The platforms included were ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. The prompt described a commercial property owner or manager with an aging, leaking flat roof who needs a contractor experienced with TPO, EPDM, or modified bitumen, capable of managing a large-scale installation without long business shutdowns, with code compliance, warranty coverage, and on-schedule commercial project management.

Platforms were asked which providers they would recommend and why. The ranking was calculated from platform mentions first, then average listed position, then best listed position. The final ranking table is the sole authority for rank, platform mentions, platform share, average rank, and best rank. Platform mentions count only platforms that named the entity during ranking discovery; they do not count platforms that later completed a fit assessment.

Thirty-one unique entities were named across the seven platforms. Nine qualified by being named by at least two platforms. Each qualifying entity was then assessed for fit against the use case using the entity evidence bundles, which include platform-reported claims, pricing summaries, strengths, limitations, disagreements, and verification questions.

Citations in this report are platform-reported evidence, not independently verified facts. Company-owned citations materially outnumber independent citations across all nine entities. Where a claim rests only on a company's own website, this report says so. Where platforms disagreed, the disagreement is preserved rather than resolved.

Research limitations

• Single prompt, single pass. The study used one standardized prompt sent once to each included platform. Different wording, a different date, or a follow-up question could produce different recommendations.
• AI answers vary. Platform answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved.
• Platform-reported research dates differ from the authoritative run date. Deepseek reported 2026-01-15 for CentiMark, Tecta America, Baker Roofing, and Flynn; 2026-05-28 for Nations Roof; 2026-06-11 for North American Roofing; 2026-06-12 for Roofing Corp of America; and 2026-04-12 for Greenwood. These are provenance metadata and do not independently prove freshness.
• Platform mentions are not fit assessments. All seven platforms evaluated fit for the entities they addressed, but platform mentions count only ranking-discovery mentions. An entity named by two platforms can rank above an entity named by five if its average listed position is higher.
• Company-owned sources dominate. The evidence audit counted 337 deduplicated citations. For every entity, owned citations outnumber independent citations. Company claims are not described as independently verified in this report.
• URLs were not independently validated. The supplied URLs were collected from platform responses and were not independently validated by the writer stage.
• Entity identity is unresolved for several entities. North American Roofing, Flynn Group of Companies, Roofing Corp of America, Commercial Flat Roof Company, and Greenwood Industries all had at least one platform flag domain or entity-identity ambiguity. Buyers should confirm the contracting legal entity.

The consensus assessment

CentiMark is the consensus leader for flat and low-slope commercial roofing in this 7-platform study, named by all seven platforms and ranked first or second by six of them. Its combination of broad low-slope system coverage, national footprint, portfolio-management tools, and a Single Source Warranty covering workmanship and materials makes it the default shortlist entry for large, occupied, or geographically distributed commercial buildings.

Tecta America is the strongest alternative for buyers who want local execution backed by a national network and manufacturer-certified installation. Nations Roof is the leading choice for multi-site portfolios that need centralized national-account coordination and documented preventive maintenance. Baker Roofing Company is the strongest regional option for the Southeast and Mid-Atlantic, particularly for buyers who value self-performed crews and a dual warranty structure.

North American Roofing, Flynn Group of Companies, Commercial Flat Roof Company, Roofing Corp of America, and Greenwood Industries each serve narrower geographic or structural niches. North American Roofing has the best average listed position in the index but was named by only two platforms. Flynn and Greenwood offer building-envelope coordination. Commercial Flat Roof Company offers a narrow regional specialization with an advertised labor-and-materials warranty. Roofing Corp of America offers a multi-market affiliate network with a lifecycle maintenance program.

No entity in this study publishes a standard price schedule, and no entity publishes complete warranty terms, contract terms, or independently verified disruption outcomes.

Frequently Asked Questions

Which commercial roofing contractor is best for flat and low-slope commercial roofing in 2026? CentiMark is the consensus leader in this 7-platform study, named by all seven platforms at an average listed position of 1.86. Tecta America, Nations Roof, and Baker Roofing Company are the next most frequently named.

How many platforms were studied? Seven: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. The study used one standardized prompt sent once to each platform on 2026-09-30.

How many entities qualified for this index? Nine entities qualified out of 31 unique names, using the rule that an entity must be named by at least two platforms during ranking discovery.

Why does North American Roofing rank fifth when it has the best average listed position? Ranking is based on platform mentions first, then average listed position, then best listed position. North American Roofing was named by only two platforms, so it ranks below entities named by five or more platforms even though both platforms that named it placed it first.

Do any of these contractors publish standard pricing? No. All nine qualifying entities are quote-based, and every platform that assessed pricing assigned low pricing confidence. The dollar figures in this report are industry benchmarks or company-reported examples, not standard rates.

Which contractor is best for a multi-site commercial portfolio? CentiMark, Tecta America, and Nations Roof all publish multi-site or national-account capabilities. Nations Roof is the most explicitly national-account-focused, with dedicated account managers and a 24/7/365 National Service Center.

Sources used in this study

Company-Owned Sources

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5. Roof Replacement: https://bakerroofing.com/commercial-roof-replacement/
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17. Our Locations: https://bakerroofing.com/our-locations/
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46. Commercial Flat Roofing Systems: https://commercialflatroofcompany.com/flat-roofing/
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51. Flynn Phoenix – Commercial Roofing & Cladding: https://flynncompanies.com/contact-us/flynn-phoenix/
52. Flynn Seattle – Commercial Roofing & Cladding: https://flynncompanies.com/contact-us/flynn-seattle/
53. Flynn Establishes New Office in Des Moines: https://flynncompanies.com/flynn-establishes-new-office-des-moines/
54. 6 Ways to Extend the Life of Your Commercial Roof: https://flynncompanies.com/how-to-extend-the-life-of-your-commercial-roof/
55. Flynn Group of Companies – Locations: https://flynncompanies.com/locations/
56. Overseas Applicants – Flynn Group of Companies: https://flynncompanies.com/overseas-applicants/
57. Repair – Flynn Group of Companies: https://flynncompanies.com/repair/
58. Flynn’s 24-Hour Service: https://flynncompanies.com/repair/24-hour-service/
59. Systems: https://flynncompanies.com/systems/
60. Flynn Group of Companies Purchase Order Terms and Conditions – U.S.: https://flynncompanies.com/wp-content/uploads/2018/06/Purchase-Order-Terms-and-Conditions-US.pdf
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62. Search results for Greenwood Industries commercial roofing: https://greenwoodindustries.com/
63. Commercial Roof Warranty: Why Maintenance Matters - Greenwood Industries: https://greenwoodindustries.com/avoid-voiding-your-roof-warranty-why-maintenance-matters/
64. In the News - Greenwood Industries: https://greenwoodindustries.com/category/news/
65. Post: https://greenwoodindustries.com/category/post/
66. Commercial v2 - Greenwood Industries: https://greenwoodindustries.com/commercial-v2/
67. Contact Greenwood Industries: https://greenwoodindustries.com/contact/
68. Greenwood Roof Services: https://greenwoodindustries.com/greenwood-roof-services/
69. Commercial Roof Maintenance Plans - Greenwood Industries: https://greenwoodindustries.com/greenwood-roof-services/maintenance-repairs-packages/
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71. Commercial Roofing and Building Envelope Services: https://greenwoodindustries.com/home/
72. Locations - Greenwood Industries: https://greenwoodindustries.com/locations/
73. Greenwood Industries Milford, MA: https://greenwoodindustries.com/locations/commercial-roofing-milford-ma/
74. Greenwood Industries Woonsocket, RI | Commercial Roofing ...: https://greenwoodindustries.com/locations/commercial-roofing-woonsocket-ri/
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76. Greenwood Industries Woonsocket, RI | Commercial Roofing Near Me: https://greenwoodindustries.com/locations/woonsocket-ri/
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78. Commercial Roof Systems: https://greenwoodindustries.com/roof-systems/commercial/
79. General 4 - Greenwood Industries: https://greenwoodindustries.com/sales-team/general-4/
80. GPA Service Plans - Greenwood Industries: https://greenwoodindustries.com/salessheets-item/gpa-service-plans/
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84. Greenwood Performance Advantage: https://greenwoodindustries.com/what-we-do/greenwood-performance-advantage/
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96. Commercial Roof Maintenance Plans & Programs | StarCare: https://naroofing.com/commercial-roofing-services/commercial-roof-maintenance/
97. Commercial Roof Repair: https://naroofing.com/commercial-roofing-services/commercial-roof-repair/
98. Commercial Roof Replacement: https://naroofing.com/commercial-roofing-services/commercial-roof-replacement/
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100. EPDM Roofing Solutions for Commercial Buildings: https://naroofing.com/commercial-roofing-systems/epdm-roofing/
101. TPO Roofing Installation & Repair: https://naroofing.com/commercial-roofing-systems/tpo-roofing/
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103. Flat Roof Replacement: https://naroofing.com/flat-roof-replacement/
104. Commercial Roofing Service Areas: https://naroofing.com/locations/
105. Single-Ply Roofing: https://naroofing.com/single-ply-roofing/
106. StarCare™ Roof Maintenance Program: https://naroofing.com/starcare/
107. Official pricing and terms source: https://naroofing.com/terms/
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109. North American Roofing Qualifications Statement: https://naroofing.com/wp-content/uploads/2024/03/NAR_Qualifications-Statement-Sheet-4_10_23-1-4.pdf
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112. Commercial Roof Asset Management Services: https://nationsroof.com/commercial-roof-asset-management
113. Commercial Roof Maintenance Plans: https://nationsroof.com/commercial-roof-maintenance-plans
114. Commercial Roofing Systems: https://nationsroof.com/commercial-roofing-systems
115. Get in Touch: https://nationsroof.com/get-in-touch
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117. Locations: https://nationsroof.com/locations
118. Dallas, TX Commercial Roofing Contractors: https://nationsroof.com/locations/dallas-tx-commercial-roofing
119. Indianapolis, IN Commercial Roofing Contractors: https://nationsroof.com/locations/indianapolis-in-commercial-roofing
120. Nashville, TN Commercial Roofing Contractors: https://nationsroof.com/locations/nashville-tn-commercial-roofing
121. Orlando, FL Commercial Roofing Contractors: https://nationsroof.com/locations/orlando-fl-commercial-roofing
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124. Commercial Roof Repair Services: https://nationsroof.com/roof-repair
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147. Protecting Your Commercial Roof With RoofAdvantage 360: https://www.aaarfg.com/news/about-roof-advantage-360/
148. Nations Roof: https://www.aeainvestors.com/portfolio/nations-roof/
149. Commercial and Industrial Roofing Contractor: CentiMark: https://www.centimark.com/
150. Hospital Roof Repair, Healthcare Facility Roofing & More | CentiMark: https://www.centimark.com/about-us/industries/hospital-roofing
151. Comprehensive Resources for Commercial Roofing | CentiMark: https://www.centimark.com/about-us/resources
152. Commercial Roof Cleaning & Warranty Solutions: https://www.centimark.com/commercial-roof-cleaning
153. Our Commercial Roof Systems: https://www.centimark.com/commercial-roof-systems
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168. Commercial Roofing Services for Pittsburgh, PA: https://www.centimark.com/locations/pittsburgh-pennsylvania
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180. Baker Roofing Company Instagram post on TPO: https://www.instagram.com/p/DT09Clbj2CZ/
181. Roofing Corp of America: https://www.linkedin.com/company/roofing-corp-of-america
182. Commercial Roof Asset Management: https://www.nationsroof.com/commercial-roofing-services/asset-management/
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184. Top 5 Trusted Commercial Flat Roofing Companies in 2026: https://www.northshoreroofing.com/blog/commercial-flat-roofing-companies
185. Why Regular Maintenance Of Commercial Roof Flashing Is Crucial: https://www.roofadvantage360.com/flashing-maintenance/
186. Which Commercial Flat Roof Material to Use: https://www.roofcorp.com/best-flat-roof-materials/
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189. Markets - Roofing Corp of America: https://www.roofingcorp.com/markets/
190. Industry veteran joins the growing team at RCA as Vice President of Premier Accounts: https://www.roofingcorp.com/press-releases/premier-accounts/
191. Roof Repairs and Maintenance: https://www.roofingcorp.com/roofing-service/roof-repairs-and-maintenance/
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193. Terms Of Use - Roofing Corp of America: https://www.roofingcorp.com/terms-of-use/
194. Commercial Roofing in Savage, MN - Schwickert's Tecta America: https://www.schwickerts.com/savage/commercial-roofing/
195. Tecta America Home Page: https://www.tectaamerica.com/
196. About - Tecta America: https://www.tectaamerica.com/about/
197. Commercial Roof Coatings | Tecta America: https://www.tectaamerica.com/commercial-roof-coatings/
198. Commercial Roofing for New Construction - Tecta America: https://www.tectaamerica.com/commercial-roofing-for-new-construction/
199. Customer Solution Center - Tecta America: https://www.tectaamerica.com/customer-solution-center/
200. Customer Solutions Center - Tecta America: https://www.tectaamerica.com/customer-solutions-center-2/
201. Commercial Roofing in Savannah GA | Metalcrafts: https://www.tectaamerica.com/location/metalcrafts-roofing/
202. Tecta America Locations: https://www.tectaamerica.com/locations/
203. Masonic Memorial Auditorium Roof Replacement: https://www.tectaamerica.com/project/masonic-memorial-auditorium/
204. Service - Tecta America: https://www.tectaamerica.com/service/
205. Commercial Roofing for New Construction - Tecta America: https://www.tectaamerica.com/service/new-construction/
206. Roof Asset Management: https://www.tectaamerica.com/service/roof-asset-management
207. Commercial Roof Replacement: https://www.tectaamerica.com/service/roof-replacement/
208. Tecta America Commercial Roofing Acquires Roofing Standards: https://www.tectaamerica.com/tecta-america-commercial-roofing-acquires-roofing-standards/
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213. Commercial Roof Cost Guide (2026): https://commercialroofguide.com/guides/commercial-roof-cost/
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216. CentiMark: https://en.wikipedia.org/wiki/CentiMark
217. Greenwood Industries Named Official Commercial Roofing Company of New England Patriots: https://finance.yahoo.com/news/greenwood-industries-named-official-commercial-124700022.html
218. What Commercial Roofing Costs | Flat Roof Report: https://flatroofreport.com/cost/
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220. Tecta America Corp - GovTribe: https://govtribe.com/vendors/tecta-america-corp-90807
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222. NRCA Commercial Roofing Contractor Directory: https://industry.nrca.net/eweb/DynamicPage.aspx?webcode=NRCAes1directory
223. North American Roofing Services LLC Company Overview: https://leadiq.com/
224. Nations Roof Company Overview, Contact Details & Competitors: https://leadiq.com/c/nations-roof/5a1d95fa23000054008496c5
225. Tecta America Commercial Roofing Company Overview - LeadIQ: https://leadiq.com/c/tecta-america-commercial-roofing/5a1d962f2300005c0084d2a4
226. nations roof - Company Details | LinkedIn: https://linkedin.com/company/nations-roof-llc
227. Single-Ply Membrane Roofing: PVC, TPO & EPDM Systems Explained: https://nationsroof.com/the-roofline-bulletin/single-ply-membrane-roofing-pvc-tpo-epdm-systems-explained
228. Roofing Corp of America Launches Nationwide Commercial Roof Service and Maintenance Program: https://prnewswire.com/news-releases/roofing-corp-of-america-launches-nationwide-commercial-roof-service-and-maintenance-program-301933909.html
229. Roofing Corp of America launches roof service and maintenance program: https://professionalroofing.net/Articles/Briefings--12-01-2023/5333
230. Greenwood Industries Inc - Premier Commercial Roofing & Building Envelope Solutions in North Haven, CT: https://profoundroofing.org/roofing-companies-near-me/greenwood-industries-inc/
231. CentiMark - 19 Reviews - Roofing in Omaha, NE - Birdeye: https://reviews.birdeye.com/centimark-164639959110173
232. CentiMark - 49 Reviews - Roofing in Charlotte, NC - Birdeye: https://reviews.birdeye.com/centimark-164649836724569
233. CentiMark - 31 Reviews - Roofing in Bartlett, TN - Birdeye: https://reviews.birdeye.com/centimark-164650506377311
234. CentiMark - 8 Reviews - Roofing in Smithtown, NY - Birdeye: https://reviews.birdeye.com/centimark-164679587554978
235. CentiMark - 14 Reviews - Roofing in Tonawanda, NY - Birdeye: https://reviews.birdeye.com/centimark-165296671669521
236. CentiMark - 12 Reviews - Roofing in Charleston, WV - Birdeye: https://reviews.birdeye.com/centimark-165459115112174
237. CentiMark - 5 Reviews - Roofing in Chesapeake, VA - Birdeye: https://reviews.birdeye.com/centimark-165460056293080
238. CentiMark - 16 Reviews - Contractors in North Charleston, SC - Birdeye: https://reviews.birdeye.com/centimark-165853592015313
239. Tecta America Arizona Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-arizona-commercial-roofing-164722452127151
240. Tecta America Austin Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-austin-commercial-roofing-164720426485483
241. Tecta America Carolinas Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-carolinas-commercial-roofing-164721451362517
242. Tecta America Central Florida Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-central-florida-commercial-roofing-164685378554835
243. Tecta America Columbus Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-columbus-commercial-roofing-164667773932490
244. Tecta America East Baltimore Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-east-baltimore-commercial-roofing-164723376632856
245. Tecta America East Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-east-commercial-roofing-164720267536248
246. Tecta America West Florida Commercial Roofing Reviews - Birdeye: https://reviews.birdeye.com/tecta-america-west-florida-commercial-roofing-164720903603699
247. Commercial Roof Cost Calculator (2026 Per Sq Ft): https://roofingcalculatorusa.com/calculators/commercial-roof-cost-calculator
248. Commercial Roof Warranty Types: NDL, Material-Only, and Labor Explained: https://roofingunited.com/commercial-roof-warranty-types-ndl-material-only-and-labor-explained/
249. Nations Roof: four acquisitions, forty branches, and a national accounts bet on commercial roofing: https://schryverco.com/insights/nations-roof-platform/
250. Commercial Flat Roofing | TPO, EPDM, BUR & Coatings: https://secommercialroofing.com/commercial-flat-roofing/
251. CentiMark Commercial Roofing Review: https://smithrock-roofing.com/centimark-roofing-review
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253. Commercial Flat Roofing: Systems & TCO Comparison: https://theroofingbrief.com/commercial-flat-roof-overview/
254. Commercial Roofing Business 2026 (How It Works): https://theroofingbrief.com/commercial-roofing-business-overview/
255. Commercial Roofing Contractor Guide 2026: https://theroofingbrief.com/commercial-roofing-contractors
256. EPDM Rubber Membrane Pricing 2026 (Per Mil) | TRB: https://theroofingbrief.com/epdm-rubber-membrane-pricing/
257. Flat Roofing Companies 2026: National Specialists: https://theroofingbrief.com/flat-roofing-companies-list/
258. Flynn BEC LP | GAF Commercial Roofers: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQE8eh5gDW_IUKvQr9JlENK-_cS7jjtxKP8_HaPkBfZ5mkC7rq8pfw1VfYa_mFGyCwviDU3na01atGOYSs7DsDdEzNG22CRuvCjeqb_Tb5MvCmFs3IXJ9yfXQF6HnXCIqwuWW45zutTnwBOeJQvy46jR2dee-y6YbANzurI4MgTwQA==
259. Commercial Flat Roof Company | BBB Business Profile: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQEMYnIO1Tqh1g-GS1tm5durXmFxcP9U8pEsXzxhkJ6B3ULYGnElIhK8cmvZMb7uBGgEaW-V7JkjOVDzJX1339TSGrbhKztGQHnaxDfqEftBkaIoccWsPpUk5VTEtn8HGov2zFI4Ofeh1CX5ya1SSjD1U1y7lieuegHtyR12mPUwQW2-4jllvRez1ZJhEf2mF8qcP4fH-bk0SSS0hbA3dQ==
260. Now Hiring: 100 Flat Roofing Jobs in Minnesota | Indeed: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFRzj3WHb1CYk-o6NokZ25ZY6iN_vjQPlbUXgSa_gojoq37V47GIZFyPzjjtK5nLSknMasnDzwh11SGaDmWShdTLlQ4r8KMNPhz3Ao5Uy3goluX6blVqSJgkq4VKOO5kKA9-YASkcxpqfZFD05-1-sy
261. Commercial Chairman's Circle | GAF Roofing: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFs7_qkdajNH6tPqtf8PY5GN04JWWfAsbl_7pnAUjESFkTD7IAK0z_iBsh5S4lmx3xWD6Fjw1KQL4gLihgTW0JzsQ7cfLc7jAAGZ6hRHTn1r6XGCVft8kNmgSC869U_veKPlST46VqFUJmWVCtCdNJiweIyTUnaaMHknS5pO2AA
262. Roofing Service Technician @ Flynn Group of Companies - Teal: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGkAJNHCmWyHb1eiSwsyS4fIH4IKIUAtOjjZU7VVtt3CCtVK78S64FnpBdVMydcU45AWaNUX4mkG6vxJsiH4KyvPR6UmMGtfNxbGcZ6nujWnYCon-Z0WldZuhs52Hay9PpKZeHYxa0ZSvH5CPzXOv0Yru6KXrXZ4QFlhdKM26YS_l4dIjBJ36hx4CRfMeM1tjM=
263. Commercial Roof Warranties Explained: https://wncroofing.com/commercial-roof-warranties-explained/
264. North American Roofing Company Reviews - Spring, TX: https://www.angi.com/companylist/us/tx/spring/north-american-roofing-company-reviews-6287244.htm
265. North American Roofing business profile: https://www.bbb.org/
266. North American Roofing | BBB Business Profile: https://www.bbb.org/us/ca/vacaville/profile/roofing-contractors/north-american-roofing-1116-927998
267. Nations Roofing, Construction & Mechanical, LLC BBB Complaints: https://www.bbb.org/us/fl/dade-city/profile/roofing-contractors/nations-roofing-construction-mechanical-llc-0653-90360072/complaints
268. Commercial Flat Roof Company of Chicago | BBB Business Profile: https://www.bbb.org/us/il/elk-grove-village/profile/commercial-roofing/commercial-flat-roof-company-of-chicago-0654-1000102426
269. North American Roofing, Inc. | BBB Business Profile: https://www.bbb.org/us/md/baltimore/profile/roofing-contractors/north-american-roofing-inc-0011-90206369/addressId/45862
270. Commercial Flat Roof Company | BBB Business Profile: https://www.bbb.org/us/mo/clayton/profile/commercial-roofing/commercial-flat-roof-company-0734-310045619
271. Baker Roofing | BBB Business Profile: https://www.bbb.org/us/nc/raleigh/profile/roofing-contractors/baker-roofing-0593-1244
272. Baker Roofing Company profile: https://www.bbb.org/us/nc/raleigh/profile/roofing-contractors/baker-roofing-company-0593-1090
273. Nations Roof, LLC BBB Business Profile: https://www.bbb.org/us/oh/springboro/profile/roofing-contractors/nations-roof-llc-0322-2265
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276. Springer-Peterson Roofing Joins Roofing Corp of America: https://www.businesswire.com/news/home/20250911930853/en
277. Baker Roofing Reviews & Complaints: https://www.consumeraffairs.com/homeowners/baker-roofing-company.html
278. Dunes Point Capital, LP Announces the Acquisition of Greenwood Industries, LLC: https://www.dunespointcapital.com/dunes-point-capital-lp-announces-the-acquisition-of-greenwood-industries-llc/
279. Commercial Flat Roof Replacement Cost: 2026 Expert Guide: https://www.firststateroofingexteriors.com/how-to-calculate-your-commercial-flat-roof-replacement-cost/
280. Commercial roof maintenance: A smarter way to preserve your roof and safeguard your warranty: https://www.fluidrealty.com/commercial-roof-maintenance-ways-to-protect-it/
281. Baker Roofing GAF Certification Directory Profile: https://www.gaf.com/
282. Greenwood Industries Inc | GAF Commercial Roofers: https://www.gaf.com/en-ca/roofing-contractors/commercial/greenwood-industries-inc-40592
283. AAA Roofing A Roofing Corp of America Co: https://www.gaf.com/en-us/roofing-contractors/commercial/aaa-roofing-a-roofing-corp-of-america-co-meridian-id-1126215
284. Baker Roofing Company | GAF Commercial Roofers: https://www.gaf.com/en-us/roofing-contractors/commercial/baker-roofing-company-raleigh-nc-61325
285. CentiMark Corporation: https://www.gaf.com/en-us/roofing-contractors/commercial/centimark-corporation-charlotte-nc-17971
286. Centimark: https://www.gaf.com/en-us/roofing-contractors/commercial/centimark-corporation-jessup-md-17946
287. Greenwood Industries Inc | GAF Commercial Roofers: https://www.gaf.com/en-us/roofing-contractors/commercial/greenwood-industries-inc-1100230
288. Nations Roof LLC: https://www.gaf.com/en-us/roofing-contractors/commercial/nations-roof-east-llc-1004877
289. Nations Roof LLC | GAF Commercial Roofers: https://www.gaf.com/en-us/roofing-contractors/commercial/nations-roof-llc-springboro-oh-1002231
290. Nations Roof Mountain LLC: https://www.gaf.com/en-us/roofing-contractors/commercial/nations-roof-mountain-llc-boise-id-1108359
291. Nations Roof XL LLC: https://www.gaf.com/en-us/roofing-contractors/commercial/nations-roof-xl-llc-mobile-al-1117073
292. North American Roofing Services LLC: https://www.gaf.com/en-us/roofing-contractors/commercial/north-american-roofing-services-llc-tampa-fl-62264
293. Roof Services a Tecta America Company - GAF Certified: https://www.gaf.com/en-us/roofing-contractors/commercial/roof-services-a-tecta-america-company-virginia-beach-va-1002777
294. Tecta America West Florida LLC - GAF Certified Contractor: https://www.gaf.com/en-us/roofing-contractors/commercial/tectaamericawestfloridallc-1005056
295. The Melanson Company, a Tecta America Co: https://www.gaf.com/en-us/roofing-contractors/commercial/the-melanson-company-a-tecta-america-co-keene-nh-1152813
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298. Nations Roof Reviews (82): Pros & Cons of Working At Nations Roof: https://www.glassdoor.com/Reviews/Nations-Roof-Reviews-E660348.htm
299. Working at Flynn Group of Companies: 281 Reviews: https://www.indeed.com/cmp/Flynn-Group-of-Companies/reviews?fcountry=ALL
300. Working at Nations Roof: 67 Reviews: https://www.indeed.com/cmp/Nations-Roof/reviews
301. Working at North American Roofing: 88 Reviews: https://www.indeed.com/cmp/North-American-Roofing/reviews?fcountry=ALL
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303. CentiMark Corporation: https://www.linkedin.com/company/centimark
304. Flynn Group of Companies: https://www.linkedin.com/company/flynn-companies
305. Centimark Corporation Profile: https://www.mesc.org/vendors/centimark-corporation
306. Baker Roofing Company Careers Profile: https://www.monster.com/
307. Flynn Group: Dallas-Fort Worth: https://www.monstercommercial.com/flynn-group-commercial-roofing-and-total-building-envelope-solutions
308. NRCA or similar directory references to Greenwood Industries: https://www.nrca.net/
309. AEA Investors acquires NRCA member Nations Roof: https://www.nrca.net/RoofingNews/aea-investors-acquires-nrca-member-nations-roof.7-18-2024.12253/details/story
310. Tecta America Corp | PCA: https://www.pcamerica.org/tecta-america-corp
311. GREENWOOD INDUSTRIES EXPANDS SPECIALTY AND HISTORIC ROOFING CAPABILITIES WITH GILBERT & BECKER: https://www.prnewswire.com/news-releases/greenwood-industries-expands-specialty-and-historic-roofing-capabilities-with-gilbert--becker-302131590.html
312. Roofing Corp of America Launches Nationwide Commercial Roof Service and Maintenance Program: https://www.rooferscoffeeshop.com/
313. Greenwood Industries - RoofersCoffeeShop: https://www.rooferscoffeeshop.com/directory/greenwood-industries
314. Roofing Corp of America - RoofersCoffeeShop: https://www.rooferscoffeeshop.com/directory/roofing-corp-of-america
315. Tecta America Marks 20 Years in Commercial Roofing Business: https://www.roofingcontractor.com/articles/94291-tecta-america-marks-20-years-in-commercial-roofing-business
316. The Benefits of an NDL Warranty for Commercial Roofs: https://www.skylineroofingcompany.com/the-benefits-of-an-ndl-warranty/
317. Commercial Roofing Cost (2026): https://www.squaredash.com/cost/commercial/
318. Baker Roofing Commercial Roofer Job Description: https://www.tealhq.com/
319. A Look At Modern Roofing Companies: Top 10 In The U.S.: https://www.techsciresearch.com/blog/a-look-at-modern-roofing-companies-top-in-the-u-s/4581.html
320. Commercial Flat Roof Company Reviews 2025: https://www.trustindex.io/reviews/commercialflatroofcompany.com
321. Flynn Group of Companies: https://www.useappello.com/directory/contractors/flynn-group-companies
322. FLYNN ROOFING - Updated September 2026: https://www.yelp.com/biz/flynn-roofing-weymouth-4
323. North American Roofing Company - San Antonio, Texas - Yelp: https://www.yelp.com/biz/north-american-roofing-company-san-antonio-2
324. Baker Roofing Project Manager Job Details: https://www.ziprecruiter.com/
325. Baker Roofing - ZoomInfo: https://www.zoominfo.com/c/baker-roofing-co/9604601
326. Greenwood Industries - ZoomInfo: https://www.zoominfo.com/c/greenwood-industries-llc/1118430947
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331. R-73-24 Approving Public Works Facility Roof Replacement: https://www.lemont.il.us/home/showpublisheddocument/11832
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