Cornerstone partners with GAF, North America's largest roofing manufacturer, because their shingles are engineered for exactly what our climate dishes out: months of steady rain, freeze-thaw cycles, and the moss that loves a north-facing Portland roofline.
Manufacturer training isn't a marketing line. It's what qualifies your roof for GAF's strongest available warranties, and it's why our installs pass inspection the first time. Every shingle we hang goes down to the nailing pattern the warranty requires.
The workhorse of our roofing line: architectural shingles with the dimensional shadow lines Portland neighborhoods are built on, installed as a full system from underlayment to ridge.
An oversized wood-shake profile for homeowners who want the depth of a shake roof with the durability and maintenance of premium asphalt.
Every Cornerstone roof is backed by manufacturer warranties on materials plus our own written workmanship guarantee. Installing to GAF's specifications is what qualifies your roof for their strongest available warranty coverage, and we walk you through exactly what's covered before you sign anything.
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