Licensed & Insured
Sonoma County Local
Free Estimates
Low-slope and flat roofs need a different approach than pitched roofs. We install TPO, modified bitumen, and built-up membrane systems engineered for positive drainage and a watertight seal.
A flat roof lives or dies by its drainage and its seams. We get both right.
TPO and membrane systems installed across Sonoma County homes and commercial buildings.
Drainage first, seams second, no shortcuts.
We assess slope, existing drainage, ponding areas, and substrate condition to recommend the right membrane system.
Tapered insulation and crickets are designed so water moves to drains and scuppers — no standing water that shortens roof life.
We remove failed membrane, repair decking, and prepare a clean, dry substrate for the new system.
Seams are heat-welded or torch-applied and every penetration is flashed to a watertight detail.
We confirm drainage performs, document the system, and register the manufacturer warranty.
A properly installed TPO or modified bitumen system typically lasts 20–30 years. The biggest factor is drainage — flat roofs that pond water fail early, which is why we design tapered drainage into every install.
Often, yes. We add tapered insulation, crickets, or additional drains to move water off the roof. For roofs near the end of life, a coating or re-cover can buy years before a full replacement.
TPO is a single-ply white membrane with heat-welded seams — energy-efficient and great for larger low-slope roofs. Modified bitumen is an asphalt-based system well-suited to smaller residential flat sections and tie-ins. We'll recommend the right one for your roof.
Yes. We repair seams, flashings, and penetrations, and we offer roof coatings to extend the life of a flat roof that isn't ready for full replacement.
TPO, modified bitumen, and built-up flat roof systems for homes and commercial buildings throughout the North Bay.
"Our flat roof ponded after every storm. Sutter re-built the drainage with tapered insulation and a TPO membrane — bone dry through the whole rainy season."
"They re-roofed our commercial building with a white TPO system. Clean seams, proper crickets, and our cooling bills actually dropped. Professional crew start to finish."
"The low-slope section over our addition always leaked. Sutter diagnosed the real problem — bad flashing — and fixed it right. No more leaks."
Free flat & low-slope roofing estimate throughout Sonoma County. We'll assess drainage and show you the right membrane for your roof.
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