Flat & Low-Slope Roofing in Ontario, CA
Flat and low-slope roofing covers any commercial roof under roughly 3:12 pitch — which is most commercial buildings. Because water drains slowly and ponds, these roofs rely on a continuous waterproof membrane (TPO, PVC, EPDM, modified bitumen, or BUR) and proper drainage rather than the gravity-shedding overlap that works on a steep residential roof.
Top Flat & Low-Slope Roofing Contractors in Ontario
Listings updated July 2026
Emmons Roof Service
Ontario, CA
Emmons Roof Service provides commercial roofing in Ontario, CA, serving warehouses, industrial, office, and retail prope...
Sandoval Roofing
Ontario, CA
Sandoval Roofing provides commercial flat roofing services in Ontario, CA, including TPO, EPDM, modified bitumen, and co...
Golden Roofing Ontario
Ontario, CA
Golden Roofing Ontario provides commercial roofing in Ontario, CA — TPO, EPDM, modified bitumen & coatings for warehouse...
First Roofing
Ontario, CA
First Roofing provides commercial roof installation, replacement, and storm repair for business properties across Ontari...
Ontario Roofing and Gutter
Ontario, CA
Ontario Roofing and Gutter provides commercial flat roofing and drainage solutions in Ontario, CA for industrial, wareho...
B & M Roofing
Ontario, CA
B & M Roofing provides commercial roofing services in Ontario, CA, covering flat and low-slope systems for industrial, w...
Ontario City Roofing LLC
Ontario, CA
Ontario City Roofing LLC provides commercial roofing services in Ontario, CA, specializing in TPO, EPDM, modified bitume...
Sunset Roofing Services
Ontario, CA
Sunset Roofing Services offers commercial roof repair & replacement in Ontario, CA, serving LA, OC & Inland Empire with...
Ontario Roofing
Ontario, CA
Ontario Roofing provides commercial roof installation, repairs & free 24-hr inspections for property managers in Ontario...
Micasa Pro Roofers - Ontario
Ontario, CA
Micasa Pro Roofers offers commercial roofing services in Ontario, CA, covering TPO, EPDM, modified bitumen, and coating...
Central Roofing Company Ontario
Ontario, CA
Licensed commercial roofing contractor in Ontario, CA offering coatings, repairs, maintenance programs & 24/7 emergency...
Ontario Roofing Services
Ontario, CA
Ontario Roofing Services provides commercial flat and low-slope roofing — TPO, EPDM, modified bitumen, coatings — for wa...
What to Expect from Flat & Low-Slope Roofing
System recommendation based on building use and budget
Tear-off of the failed roof and deck inspection
Insulation upgrade to current energy code
New manufacturer-backed membrane installed by a certified crew
Final inspection and warranty registration
Flat & Low-Slope Roofing Pricing in Ontario
Pricing varies by contractor and project scope
Request quotes from multiple contractors to compare pricing. Factors that affect cost include system size, building type, equipment brand, warranty terms, and urgency. Always ask for an itemized written estimate before authorizing work.
Get free quotes from Ontario contractorsRelated Replacement Services in Ontario
Frequently Asked Questions — Flat & Low-Slope Roofing in Ontario
How much does flat & low-slope roofing cost in Ontario, CA?
Flat & Low-Slope Roofing costs in Ontario vary based on system size, building type, and scope. Request quotes from multiple contractors through My Roofing Tech to compare pricing. Always ask for itemized written estimates before authorizing any work.
How do I choose the best flat & low-slope roofing contractor in Ontario?
Look for contractors with specific experience in commercial roofing (not just residential). Verify their state license, insurance, and bonding, and confirm they're certified and experienced with your roof system. Check reviews from similar commercial properties. Ask about their workmanship warranty and their typical response time for follow-up issues.
How long does flat & low-slope roofing typically take?
The timeline depends on the size and complexity of your roof system and the scope of work. Simple repairs often complete in a few hours. Larger installations and replacements may take several days to a few weeks. Emergency service typically stabilizes the problem within hours even when the permanent fix requires returning with materials.
Is flat & low-slope roofing covered by building insurance?
Generally, sudden storm or accidental damage may be covered by commercial property insurance, while gradual wear and deferred-maintenance issues are not. Contact your insurance provider and ask specifically about coverage for your roof system. A documented inspection report strengthens any claim you file.