Portland Metro Area : 503-667-0175503-667-0175 503-667-0175
Seattle Metro Area : 253-589-8999253-589-8999 201-594-0900

Roofer Installs Built-Up RoofingAs one of the most common roofing materials used on low-slope commercial roofs, built-up roofing is composed of alternating layers of bitumen and reinforcing fabric. The final product creates a continuous sealed surface that offers a number of benefits.

At McDonald & Wetle, we provide expert installations and replacements of built-up roofing to commercial and industrial customers throughout the Pacific Northwest. Call our Portland, Oregon or Seattle, Washington office today to learn about the advantages of this type of roofing.


Unlike single-ply roofing, built-up roofs consist of multiple membrane layers inserted between layers of asphalt, tar or coal tar. The result is a long-lasting roofing material that resists wear and tear. When properly maintained, built-up roofing has an average life expectancy of 20 to 30 years. However, depending on the climate and specific materials used, this type of roofing can last up to 40 years.

Water Resistance

With multiple layers of reinforcement, built-up roofing offers excellent waterproofing protection. The reason for its superior resistance goes back to the way it’s installed. After each membrane layer is put into place, the bitumen gets heated and applied by mop or mechanical spreader, helping create a watertight seal along the entire roof and providing years of reliable protection from the elements.


Most types of roofing shouldn’t be walked on – except by roofing professionals when conducting inspections or performing maintenance. However, built-up roofing can withstand high foot traffic. These roofs often serve as a platform for mechanical systems, solar panels and rooftop gardens on commercial, industrial and residential buildings. They can even be used to create usable outdoor living spaces when installed beneath a roof deck.

Experience the Benefits of Built-Up Roofing

From shopping centers to warehouses and everything in between, built-up roofing offers a number of benefits to commercial building owners and facility managers. Contact our Portland or Seattle area office today to learn more about built-up roofs or to request a quote.

Contact Us
McDonald & Wetle

Portland Metro Area

2020 NE 194th Avenue, Portland
OR 97230, USA
Phone: 503-667-0175 503-667-0175
Hours of Operation:
Monday-Friday 8am to 4pm

Seattle Metro Area

9420 39th Avenue, Lakewood
WA 98499, USA
Phone: 253-589-8999 253-589-8999
Hours of Operation:
Monday-Friday 8am to 4pm

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