Flat Roofing Companies and Contractors in 2026: National Specialists and Regional Players

Flat roofing contractors for commercial low-slope work in 2026 fall into two groups: company-owned national branch networks (Tecta America, CentiMark, Nations Roof) and long-tenured regional firms, and both are gated by the membrane maker’s contractor tier that controls NDL warranty eligibility. When a facilities director or REIT asset manager needs a flat roof replacement contractor for a 400,000 square foot TPO roof on a distribution center, the shortlist shrinks fast: the bidder needs the right maker approval, state licenses, a workers’ compensation experience mod at or below 1.00, and the surety backing to bond a seven-figure project. The profiles below come from each company’s own website, Roofing Contractor’s 2026 Top 10 table and published ownership announcements.

By The Roofing Brief Team. Last reviewed: October 2026.

The shape of the commercial flat roofing market in 2026

Federal survey data give the only public read on flat roof materials. In The Roofing Brief’s analysis of the EIA 2018 Commercial Buildings Energy Consumption Survey microdata, single-ply and synthetic membranes cover 44.3% of U.S. commercial flat roof area and built-up roofing covers 28.1%; in buildings constructed 2013 to 2018, membranes hold 40.9% of roof area against 7.8% for built-up. CBECS does not split membrane into TPO, EPDM and PVC, and published vendor estimates of those shares disagree, so treat any precise TPO percentage as a vendor estimate. The buyer side is concentrated: industrial REITs, healthcare systems, school districts, big-box retail chains and federal facilities account for most multi-million dollar projects, which is why private equity has rolled up the top tier of contractors (modified bitumen and built-up specialists included).

Our commercial membrane market share report shows the full EIA CBECS 2018 breakdown, and the commercial flat roof overview compares TPO, EPDM, PVC and modified bitumen by climate zone.

Decision table: which flat roofing contractor fits the job

If your project is	Shortlist	Rule or source
Multi-site portfolio in 5 or more states	1 national branch network (Tecta America, CentiMark, Nations Roof) plus 1 regional per metro on the same spec	Editorial rule: one contract and one warranty desk
Single building or 2 to 3 buildings in one metro	2 or 3 regional specialists plus 1 national branch	Editorial rule: local crews, local inspectors
GAF system with an NDL guarantee longer than 25 years	GAF PlatinumElite contractors only (up to 35 years)	GAF commercial contractor certification page
Carlisle or Elevate system with a 30-year warranty	Approved applicators for that exact assembly (deck, attachment, membrane line)	Carlisle warranty services; Elevate QuickSpec sheets
Federal construction contract over $150,000	Bidders able to post performance and payment bonds	40 U.S.C. 3131 as applied by FAR 28.102-1
Miami-Dade or Broward building	Bidders with HVHZ project history and product approvals for the assembly	Florida Building Code HVHZ provisions
Bidder EMR above 1.00	Ask for 3 years of loss runs before shortlisting	NCCI: a mod above 1.00 is a debit

National flat roofing companies with multi-state coverage

National coverage in commercial roofing is uncommon. Tecta America, CentiMark and Nations Roof operate company-owned branch networks; KPost is included because it bids large commercial work from its Dallas base. Footprints below come from each company’s own website, viewed October 2026.

Company	Headquarters	Footprint	Ownership	2025 revenue (RC 2026)
Tecta America	Rosemont, IL	More than 110 locations	Private equity backed; Altas Partners majority since 2018	$1.6 billion, 100% commercial
CentiMark	Canonsburg, PA	Over 100 offices: about 70 US roofing, 22 US QuestMark flooring and 13 Canadian	Family and employee-owned (ESOP)	Did not submit for 2026
Nations Roof	Mobile, AL (per Roofing Contractor)	40+ branch locations	AEA Investors, since July 2024	$500 million, 98% commercial
KPost Company	Dallas, TX	Mainly North Texas, plus other Texas markets	Not stated	Not in the 2026 Top 10

Tecta America

Tecta America reported $1.6 billion in revenue, all commercial, on Roofing Contractor’s 2026 Top 100, the highest among commercial roofers that submitted. Its website lists more than 110 locations and 5,500 roofing professionals. Altas Partners took majority ownership in 2018, Leonard Green & Partners added a minority stake in 2021, and Tecta has continued to acquire regional roofers. Tecta offers sheet metal, waterproofing, daylighting (skylights), and exterior wall work alongside single-ply membrane and built-up roofing. For multi-site portfolios that want one contractor across many states, Tecta is a common name on the bid list; confirm its manufacturer approvals for your system in each manufacturer’s locator.

CentiMark

CentiMark is headquartered in Canonsburg, PA (Pittsburgh metro). It says it has over 100 offices across North America; its locations page, viewed October 2026, lists about 70 US roofing offices, 22 US QuestMark flooring offices and 13 Canadian offices. The company describes itself as family and employee-owned, with an Employee Stock Ownership Program. Ownership, warranty terms and public safety records are in our full CentiMark profile. CentiMark’s FAQ says it is only a commercial roofing contractor, and it runs a National Accounts program and maintenance programs for owners with buildings in several states. It ranked second on Roofing Contractor’s 2024 and 2025 Top 100 lists and did not submit for 2026.

Nations Roof

Nations Roof lists more than 40 branch locations and more than 100 roofing crews on its website, and it has operated since 2004. It owns its locations rather than franchising them, according to AEA Investors, whose middle-market private equity team acquired the company in July 2024; Acacia Partners had made a growth equity investment in 2021. Roofing Contractor’s 2026 Top 100 placed it sixth with $500 million in revenue, 98% commercial. Its website says it serves single-site owners and multi-location portfolios and is certified by all manufacturers; confirm the approval for your specified system in the manufacturer’s locator.

KPost Company

KPost Company is headquartered in Dallas and opened in January 2004. Its website lists more than 400 employees and more than 60 specialized crews, roofing and waterproofing work centered on North Texas, and partnerships with the Dallas Cowboys and Texas Rangers. It is not a national branch network; confirm its manufacturer approvals for your system in each manufacturer’s locator.

Regional flat roofing contractors

For single-site projects or local clusters, regional specialists such as Baker Roofing or A.W. Farrell can win on responsiveness, pricing, and local relationships. This is why the search for commercial roofing contractors near you often ends with a regional firm rather than a national brand, and why buyers lean on guides to finding vetted regional specialists. Profiles below are drawn from each company’s own site or trade-press coverage; confirm manufacturer approvals and licenses for any of them before bidding.

Southeast and Mid-Atlantic

• Baker Roofing (founded in Raleigh NC; Cary NC per Roofing Contractor): Founded in 1915 and 100% employee-owned since 2025, according to the company. Roofing Contractor’s 2026 Top 100 placed it seventh with $356 million in revenue, 90% commercial. Serves the Southeast and Mid-Atlantic, with project pages that include churches, schools and university buildings.
• Latite Roofing (Pompano Beach FL): Dates the company to 1943 and serves commercial and residential customers across Florida, with operations in Georgia, Tennessee and Texas through its family of companies, which includes Roof Management Inc. and Invictus Roofing. A Sun Capital Partners affiliate acquired Latite in January 2025. Florida work includes high-velocity hurricane zone (HVHZ) projects, where Miami-Dade and Broward rules apply.
• Tremco WTI: Weatherproofing Technologies, the roofing services arm of Tremco, which is owned by RPM International. Relevant mainly to owners with existing Tremco roof assemblies.
• Roofing Corp of America (Atlanta GA): Placed fourth on Roofing Contractor’s 2026 Top 10 with $652 million in revenue, 90% commercial, 1,970 peak staff, and no private equity ownership reported.

Northeast

• A.W. Farrell & Son (Dunkirk NY): In business since 1946 and family and employee-owned, according to its website, with divisions in Buffalo, Dunkirk, Plattsburgh, Queensbury and the Albany Capital Region in New York, plus Erie PA, Cleveland OH and Las Vegas NV.
• Greenwood Industries (Worcester MA): Placed ninth on Roofing Contractor’s 2026 Top 10 with $350 million in revenue, 100% commercial, and 1,106 peak staff; the table marks it as private equity backed.

Midwest

• D.C. Taylor Co. (Cedar Rapids IA): Family-owned commercial and industrial roofer founded in 1949, with service locations in several states, including the Kansas City area according to Roofing Contractor.
• Maxwell Roofing (Nashville TN): Founded in 1956 and owned by the third generation of the Maxwell family; serves Middle Tennessee, southern Kentucky and northern Alabama, with an office in Huntsville.

West Coast

• Highland Commercial Roofing (Riverside CA): Commercial roofer established in 1991 that describes a service area across the Western states, including California, Arizona, Nevada, Utah, Oregon, Washington and Idaho. California work requires a C-39 license; check it on the CSLB site.
• Best Contracting Services (Gardena CA): Large Southern California commercial contractor with sheet metal and waterproofing divisions in addition to roofing.

For a deeper directory by metro and submarket, our commercial flat roofing contractors guide expands these lists with current contact information and project portfolios.

Manufacturer authorized applicator certifications: the real gatekeeper

Membrane maker warranties are one of the largest financial variables on a flat roof, and eligibility depends on the approval the installer holds with each maker. The programs below are the ones most often named on bid lists for NDL (No Dollar Limit) work, with the published ceilings where the maker states one. Program names change (older bid documents may still name GAF “Master Select”, while GAF’s current commercial page lists GAF Certified, GoldElite and PlatinumElite), so confirm current terms with each manufacturer.

Maker	Contractor tiers	Published warranty ceiling	Source
GAF	GAF Certified, GoldElite, PlatinumElite (less than 10% of GAF commercial contractors)	Diamond Pledge NDL up to 25 years (GoldElite), up to 35 years (PlatinumElite)	GAF
Carlisle SynTec	Authorized Applicator network	Up to 30 years; hail up to 3 in. and winds up to 120 mph covered; field inspection of every warranted roof	Carlisle
Elevate	Red Shield Warranty applicators	Adhered UltraPly Platinum TPO over lightweight concrete: up to 30 years, 55 mph	Elevate QuickSpec
Sika Sarnafil	Partners Club: Elite (highest) and Partner, rated annually	Confirm term for the specified assembly	Sika
Johns Manville	Peak Advantage: Peak, Summit Club, Pinnacle Council, 5280 Council	Confirm term for the specified assembly	JM

• Carlisle Authorized Applicator: Authorized Applicator status is the baseline for installing Carlisle warranted Sure-Weld TPO, Sure-Flex PVC and Sure-Seal EPDM systems, and Carlisle says every warranted roof is inspected by a field service representative before the warranty issues.
• GAF GoldElite and PlatinumElite: GAF’s current commercial designations above GAF Certified. GoldElite contractors can offer the Diamond Pledge NDL Roof Guarantee for up to 25 years on qualifying systems; PlatinumElite contractors, which GAF says are less than 10% of its commercial contractors, can offer up to 35 years.
• Versico: Versico is a division of Carlisle Construction Materials with its own authorized contractor network; confirm the installer’s Versico approval separately from any Carlisle approval.
• Elevate Red Shield (formerly Firestone): Holcim completed its acquisition of Firestone Building Products in March 2021 and renamed it Elevate in 2022; Elevate became part of Amrize when Holcim spun off its North American business in June 2025. Red Shield is Elevate’s contractor designation tied to its stronger warranty options.
• Sika Sarnafil contractor program: Sika Sarnafil PVC membrane is a PVC single-ply product used in healthcare, education, and federal work, among others. Sika sells to authorized applicators that it rates every year on technical and business criteria and classes as Elite or Partner.
• Johns Manville Peak Advantage: JM’s contractor program for roofers certified on JM systems, with four levels from Peak to the 5280 Council; ask JM which level its guarantee on your assembly requires.
• IB Roof Systems: IB Roof Systems is a PVC specialist; ask IB which installer approval its warranty on your assembly requires before award.

A contractor without the manufacturer’s approval for the specified system generally cannot deliver that manufacturer’s long-term NDL warranty on a new TPO or PVC roof (on GAF systems, terms over 25 years need a PlatinumElite approval), which makes approval status a major filter on bid lists for institutional and REIT owners. Our commercial roof warranty guide walks through warranty types in detail and what NDL actually covers versus material-only warranties.

National account vs regional specialist: the real tradeoffs

The decision between a national contractor and a strong regional specialist usually comes down to portfolio shape and accountability needs. Multi-site owners across five or more states favor a national firm such as Tecta America for single-vendor accountability and unified reporting, while single-site owners favor a regional specialist for responsiveness and price. At 5 or more states, the national option usually wins on administration; at 1 to 3 buildings, the regional usually wins on response time. For a broader look at how experienced buyers find and vet commercial roofers, weigh the tradeoffs below against your own portfolio rather than the brand name.

• Multi-site portfolios across 5+ states (REIT, retail chain, hospital system): A national contractor (Tecta America, CentiMark, Nations Roof) offers single-vendor accountability, consistent crew quality, unified safety reporting, and a single point of contact for warranty service across the portfolio. Owners who would otherwise manage many separate regional vendors may judge that worth some price premium; compare bids to see what it costs on your portfolio.
• Single-site or local cluster (2-3 buildings in one metro): A regional specialist such as Baker Roofing or Latite Roofing can win on responsiveness (faster service calls, faster mobilization on emergencies), pricing (lower overhead allocation), and local relationships (familiarity with local inspectors and permitting). The regional contractor often holds the same manufacturer certifications as the national.
• Specialty work (hurricane zones, hospital infection control, cold storage, federal): A regional contractor with deep local market experience can compete well against a national. Florida HVHZ work in Miami-Dade and Broward, where product approvals and ASCE 7 uplift calculations are part of the submittal, is one example.

For more on matching contractor scale to project type, see best commercial roofing companies.

How ownership structure can matter

The ownership profile of a roofing contractor can affect crew tenure, leadership continuity and how a firm services a warranty over a 20 to 30 year roof life, although the effect varies by company and is hard to measure from outside. Three structures are common, and each raises different questions for owners:

• PE-backed (Tecta America, Nations Roof/AEA Investors, Latite/Sun Capital, many regional rollups): Owners can fund safety programs, technology and geographic expansion, and a PE-backed company may change hands again during a roof’s warranty term. Ask how warranty service obligations carry over after a sale.
• ESOP / employee-owned (CentiMark, Baker Roofing since 2025, A.W. Farrell): Employees hold a financial stake in the company. CentiMark is the largest example on this page; ask who administers warranty service and how long key staff have been with the branch.
• Family-held (Maxwell Roofing, D.C. Taylor Co.): Multi-generational ownership can mean continuity of leadership; ask about succession plans if your warranty term runs 20 years or more.

State licensing and bonding requirements

Commercial roofing licensing varies state by state, and the variance is operationally significant. A contractor licensed in one state cannot automatically work in an adjacent state, and requirements range from a state-issued license in Florida and California to municipal registration in Texas and city-level licensing in New York City. Verifying current licensing in every state of operation is the first qualification step before an RFP goes out.

• Florida: Requires a Certified Roofing Contractor (CCC) license issued by the Florida Department of Business and Professional Regulation. Hurricane zones (Miami-Dade, Broward, parts of Palm Beach) require additional HVHZ compliance and product approvals.
• California: Requires a C-39 Roofing Contractor license from the Contractors State License Board, with separate bonding requirements and prevailing wage compliance on public work. Under AB 2622, CSLB says any job of $1,000 or more in labor and materials, or any job needing a permit, requires a license (CSLB license check).
• Texas: No statewide roofing license requirement, but municipal registration is common in major metros. The Roofing Contractors Association of Texas (RCAT) offers a voluntary certification program.
• New York: There is no statewide roofing license; requirements are set locally. New York City licenses home improvement contractors for residential work and sets its own site safety rules for commercial jobs, so confirm both with the city before award.
• Massachusetts: The state licenses construction supervisors (CSL) and registers home improvement contractors (HIC) for residential work; commercial work follows the Massachusetts State Building Code (780 CMR) as enforced by each municipal building department, so check requirements for each address.

For multi-state portfolio work, verifying licensing in every state of operation, from the Florida DBPR to the California CSLB, is the first step before issuing an RFP. Our how to choose a roofing contractor guide includes a state-by-state licensing reference.

The six-step vetting framework

Experienced commercial property owners use a consistent six-step process to qualify roofing contractors before issuing an RFP: license verification, manufacturer certification, an EMR below 1.0, three reference checks, bonded financials, and OSHA safety documentation. Skipping any of these steps raises the risk of warranty disputes and project problems, so treat all six as required.

1. License verification: Pull the current license from the state licensing board (for example the California CSLB or Florida DBPR) for every state the contractor will work in. Confirm the license is active, in good standing, and held by the entity (not a predecessor company).
2. Manufacturer certification: Confirm current top-tier certification with the manufacturer specified in the project assembly. A lapsed certification voids NDL warranty eligibility, and on GAF systems a 35-year Diamond Pledge term requires PlatinumElite. Check the approval level the manufacturer requires for the warranty you specify.
3. EMR below 1.0: Workers compensation Experience Modification Rate (EMR) below 1.0 indicates a safety record better than the industry average. Per NCCI’s ABCs of Experience Rating, a 1.25 mod turns $100,000 of manual premium into $125,000. Many institutional and REIT owners set an EMR cap, often 1.0, in their pre-qualification requirements.
4. Three reference checks: Request three references for projects of comparable size and assembly type completed in the last 2 years. Actually call the references, ask about service after substantial completion, and ask whether they would rehire.
5. Bonded financials: Request a current bonding letter from the contractor’s surety. Confirm the contractor can carry a bond at least equal to the contract value (single project bond) and that the surety letter states both single-project and aggregate limits. On federal work over $150,000, FAR 28.102-1 requires performance and payment bonds.
6. SDS and safety documentation: Confirm OSHA 30 training for foremen, current Safety Data Sheets for every product on site, a written fall protection method for edges 6 ft or more above the lower level under OSHA 1926.501(b)(10), and current hot work permits if torch-down or open-flame work is part of the assembly.

What a tight commercial flat roofing RFP looks like

The cleanest RFPs in commercial roofing specify: membrane type and thickness (e.g., 60-mil TPO mechanically attached), insulation R-value and type, cover board, attachment method, drainage details, warranty term and type (NDL vs material-only), bonding requirements, safety requirements (EMR cap, OSHA documentation), and required manufacturer certifications. Less experienced owners issue vague RFPs and end up comparing apples to oranges on bid day.

For pricing benchmarks before issuing an RFP, see our commercial roof replacement cost guide (installed price per square foot by membrane type, region and project size), the TPO roof installation cost guide, and The Roofing Brief’s 2026 roofing cost report for material and installed-cost movement.

Service and maintenance: where the contractor relationship pays off

A commercial flat roof is a 20 to 30 year asset, and most of the financial value of the warranty is realized through routine maintenance and prompt service response. Many national and regional contractors run service divisions separate from their new-construction crews. CentiMark and Tecta America both offer national account programs; Baker Roofing, Latite, and most strong regional contractors run their own local service groups. When evaluating contractors, ask specifically about: average response time on service calls, whether the service group is a separate P&L from new construction, and how preventive maintenance contracts are priced (per square foot per year or per visit). Carlisle’s Continu-Care program, for example, lets eligible applicators extend total system warranties through annual preventive maintenance. Our commercial roof maintenance program guide goes deeper on what to expect from a preventive maintenance agreement.

Bottom line on flat roofing contractor selection

For a multi-site portfolio across 5+ states, a national contractor with company-owned branches (Tecta America, CentiMark, or Nations Roof) is a common starting point. For single-site or local cluster work, a regional specialist with the same manufacturer approvals can compete on responsiveness and price. In every case, the six-step vetting framework (license, certification, EMR, references, financials, safety) is the filter that separates qualified bidders from price-only proposals. The manufacturer certification tier determines warranty eligibility, and warranty eligibility is the single largest financial variable on a commercial flat roof project. Get those two right and the rest of the contractor selection process is much simpler.

Flat roofing companies: frequently asked questions

Who is the largest flat roofing company in the United States?

On Roofing Contractor magazine’s 2026 Top 100, published July 30, 2026, Tecta America reported $1.6 billion in revenue, all commercial, the highest among commercial roofers that submitted. Its website lists more than 110 locations. CentiMark, which ranked second in 2024 and 2025 and reported more than $1 billion in sales for 2021, did not submit for 2026. Altas Partners has held majority ownership of Tecta since 2018.

What is an NDL warranty and which companies can offer one?

NDL stands for No Dollar Limit, the manufacturer warranty that covers the full cost of covered repairs with no cap. Manufacturers generally issue NDL warranties only on systems installed by contractors they have approved for that system, so check the contractor’s approval in the manufacturer’s locator before relying on an NDL bid.

Should I hire a national or a regional flat roofing company?

Portfolio shape decides it. Multi-site portfolios across five or more states often favor a national contractor such as Tecta America or Nations Roof for single-vendor accountability and unified warranty service, which some owners judge worth a price premium. Single-site or local-cluster projects often favor a regional specialist that can compete on responsiveness, pricing, and local relationships while holding the same manufacturer approvals.

Which manufacturer certifications should a flat roofing company hold?

Programs often named on bid lists include Carlisle Authorized Applicator, GAF GoldElite and PlatinumElite, Versico, Elevate Red Shield (formerly Firestone), Sika Sarnafil Elite and Partner, and Johns Manville Peak Advantage. Each manufacturer ties its stronger warranty options to its own program, and a lapsed approval can end NDL warranty eligibility on that manufacturer’s systems.

How do I vet a flat roofing company before issuing an RFP?

Use a six-step framework: verify the state license in every state of work, confirm current top-tier manufacturer certification, require an EMR below 1.0, check three references for comparable recent projects, request a bonding letter confirming adequate capacity, and confirm safety documentation including OSHA 30 training and a written fall protection plan. Skipping a step makes warranty disputes more likely.

Do flat roofing companies need a state license?

Licensing varies by state. Florida requires a Certified Roofing Contractor (CCC) license and California requires a C-39 license for jobs of $1,000 or more, each with its own bonding rules. Texas has no statewide roofing license but common municipal registration, while New York licenses at the city level. A contractor licensed in one state cannot automatically work in an adjacent one, so verify licensing wherever the work will happen.