Flat Roof Repair & Replacement Portland, Oregon
TPO & PVC Specialists
Serving Portland's Downtown, Pearl District, Lloyd District, Central Eastside, Northwest Industrial, Swan Island, Rivergate, South Waterfront, Beaverton, Hillsboro, Lake Oswego, and Vancouver, WA.
Portland Oregon averages 43 inches of rainfall annually with humidity averaging 73% and winter wind gusts up to 60 mph — conditions that put flat roofing systems under constant stress. Flow Roofing specializes in flat roof repair and replacement for commercial properties, warehouses, industrial buildings, HOAs, and multi-family properties across the Portland metro and Pacific Northwest.
We primarily install and service TPO, PVC, and modified bitumen roofing systems — the three most widely used flat roof systems in Portland's commercial market. TPO and PVC membrane systems offer heat-welded seams, long-term moisture resistance, and 20–30 year lifespans. Modified bitumen is the proven workhorse found on thousands of older Portland commercial buildings throughout the Central Eastside, Lloyd District, Swan Island, and Northwest Industrial corridor — a durable asphalt-based system that Flow Roofing repairs and replaces daily. Flow Roofing is a certified installer, meaning we can offer extended manufacturer warranties including No Dollar Limit coverage that non-certified contractors cannot provide.
Flat Roof Services We Provide in Portland, Oregon
Flow Roofing provides the following flat roofing services for commercial and residential properties throughout the Portland metro and Southwest Washington:
Flat roof repair — leak detection, seam repair, flashing repair, penetration repair, and emergency patching for TPO, PVC, modified bitumen, and torch-down systems. Flat roof replacement — full system removal and installation of new TPO, PVC, or modified bitumen roofing to manufacturer specifications and local building codes. Flat roof maintenance — biannual inspection programs including written condition reports, drain cleaning, seam checks, and minor repairs designed to extend flat roof lifespan in Portland's rainy climate. Flat roof inspection — comprehensive written condition assessments with photos and prioritized recommendations for property owners and managers.
TPO, PVC & Modified Bitumen — Portland's Top Flat Roof Systems
TPO and PVC are thermoplastic membrane systems designed to expand and contract with temperature changes — a critical feature in the Pacific Northwest where roofs cycle through cold wet winters and warm dry summers. Both systems use heat-welded seams that are stronger than the membrane itself, resist moisture and mold, and reflect sunlight to reduce cooling costs during Portland's warmer months.
The key difference between TPO and PVC: TPO is the more cost-effective option and performs excellently across most Portland commercial applications. PVC costs slightly more but offers superior resistance to ponding water and chemical exposure — making it the better choice for restaurant rooftops, food processing facilities, or Portland buildings where drainage is slow.
Modified bitumen is an asphalt-based flat roof system applied in layers and commonly found on older commercial buildings throughout Portland's Central Eastside Industrial District, Lloyd District, Swan Island, Northwest Industrial corridor, and Rivergate. Mod bit systems are extremely durable and weather resistant — Flow Roofing repairs, maintains, and replaces modified bitumen roofs throughout the Portland metro daily. When a mod bit system reaches end of life, we can replace it in kind or upgrade to a TPO or PVC membrane depending on your building's needs and budget.
Flow Roofing will assess your building and recommend the right system based on your roof slope, drainage, budget, and building use — not whatever has the highest margin.
Flat Roof Repair & Replacement Across Portland's Commercial Districts
Flow Roofing services flat roofs throughout Portland's highest-density commercial and industrial areas including Downtown Portland, the Pearl District, Lloyd District, Central Eastside Industrial District, Northwest Industrial, Swan Island Industrial Park, Rivergate Industrial District, South Waterfront, and the Airport Way corridor near PDX. In the suburbs we serve Beaverton, Hillsboro, and the Sunset Corridor, Lake Oswego and Kruse Way, Tigard, Tualatin, Wilsonville, and Gresham Vista Business Park. In Southwest Washington we serve Vancouver, Camas, and Washougal.
Flow Roofing provides flat roof repair and replacement throughout Portland, Beaverton, Hillsboro, Lake Oswego, Tigard, Tualatin, Gresham, Oregon City, West Linn, Wilsonville, the Oregon Coast, and Vancouver, Camas, and Washougal in Southwest Washington.
Call 503-936-2476 for a free flat roof inspection.
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