Flat Roof and Commercial Roofing
Flat roofs fail at seams, drains and edges. We repair those spots or install a new TPO single ply roof that reflects sun and holds up to standing water. Flat roof and commercial roofing work gets the same written quote and photos as a house.
Homes and Commercial Buildings
Ontario has some of the largest warehouse roofs in the country. Most of the low slope work we do is closer to home, though. Patio rooms, additions, garages, small retail centers and office buildings near the airport.
Why Flat Roofs Leak
Water sits on a flat roof longer than on a sloped one. Any seam that has opened, any drain that is clogged, any edge where the flashing has pulled loose will let it in. Rooftop units add more holes in the roof that need sealing.
We start by clearing drains and finding where water ponds. Then we check every seam and penetration. Many flat roofs need repair, not replacement, and we will say so.
TPO and Coatings
TPO is a white single ply membrane with seams welded by heat. It reflects sun, which helps cooling bills, and the welded seams hold up to ponding. For roofs that are still sound, a reflective coating can add years and cut heat gain. Our roof coatings page covers when a coating is worth it.
Flat and Commercial Roofing by City
Pages for the towns where we do the most of this work, written for the homes there.
Flat and Commercial Roofing in Ontario, Rancho Cucamonga, Upland, Chino, Chino Hills, Fontana, Montclair, Eastvale, Pomona, Claremont.
Questions People Ask
Do you work on commercial buildings?
Yes. We repair and replace low slope roofs on shops, offices and small commercial buildings. Call to talk through the size and access.
Is a roof coating worth it?
On a sound roof with minor wear, a coating can add years for far less than a new roof. On a roof that is wet inside or has failed seams, a coating only hides the problem.
Related Services
Where to Find Ontario Roofing
4335 E Lowell St Ste G, Ontario, CA 91761
Get a Free Roof Estimate
Tell us what your roof is doing. We look, take photos and give you a written price.