Roofing

Roof replacement & installation in Portland, OR.

GAF-certified roof replacement built for forty-plus inches of Pacific Northwest rain. Premium shingles, certified installation, manufacturer-backed warranties.

What's included in a Cornerstone roof.

Every roof we install is a complete system, not just shingles. We start with a full tear-off, inspect the decking, and rebuild the waterproofing from the sheathing up, so the roof you see is backed by layers of protection you don't.

  • →Full tear-off and decking inspection
  • →Ice-and-water shield at eaves, valleys, and penetrations
  • →Synthetic underlayment and drip edge throughout
  • →GAF architectural shingles installed to manufacturer spec
  • →New flashing, pipe boots, and balanced attic ventilation
  • →Daily site cleanup and a final magnetic sweep
Harnessed Cornerstone roofer installing GAF shingles during a Hillsboro, OR roof replacement

GAF, installed the way GAF intended.

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.

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Warranty

Backed in writing.

Every Cornerstone roof is backed by manufacturer warranties on materials plus our own written workmanship guarantee. If something we installed isn't right, we come back and make it right. That's the job.

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Resource Hub

Related reading.

Aerial view of a Gladstone, OR roof mid-replacement with old shingles on one slope and exposed rafters on the otherCost GuidesRoof Replacement Cost in Portland, OR (2026 Guide)Roof replacement cost in Portland, OR explained by a local estimator: real ranges by material, per-square math, tear-off vs. overlay, and what drives price.August 4, 2026Aerial view of a Gladstone, OR roof mid-replacement with old shingles on one slope and exposed rafters on the otherInsurance & ClaimsDoes Insurance Cover Roof Replacement in Oregon?Does insurance cover roof replacement in Oregon? When storm damage is covered, what adjusters look for, and how ACV vs. RCV policies change your payout.August 4, 2026Top-down aerial view of a completed gray shingle roof with skylights and a brick chimney in Tualatin, ORRoofingHow Long Does a Roof Last in Oregon? (By Material)How long does a roof last in Oregon? Real PNW lifespans by material, what cuts them short, and the signs it's replacement time — from a local roofer.August 4, 2026
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