Shingle Roof Installation, Step by Step

Deck review

Once the old roofing is off, the wood decking underneath is exposed for the first time in years. We look for soft, delaminated or water-stained sheets. If a section needs replacing, we show you what we found and explain the choice before that wood is covered.

Underlayment and leak barrier

Underlayment is the sheet layer between the deck and the shingles. It is the backup that keeps wind-driven rain from reaching the wood if water ever gets past the shingles. Along the eaves, in valleys and around openings, a self-adhering leak barrier adds protection where water collects or changes direction.

Edge metal and flashing

Drip edge at the eaves and rakes guides water into the gutters and away from the fascia. Where the roof meets a wall, a chimney or a skylight, flashing is set so each piece sheds water over the one below it. Sealant alone is never treated as a substitute for proper metal.

GAF shingle installation

Shingles are fastened and aligned according to the manufacturer's written instructions for the product chosen. Starter shingles go along the edges first, so the first course is sealed and secured.

Ridge and attic airflow

A roof works best when the attic can breathe. Air comes in low, near the eaves, and leaves high, at the ridge. We check that the intake and the exhaust are balanced and that the ridge cap is installed to match the shingle.

Cleanup and final walk

Ask how cleanup and the final walkthrough are handled on your job; the answer belongs in writing before work starts.

What is outside this page

This site does not cover flat or low-slope roof systems or insurance claims. If your question is about one of those, ask, and we will tell you plainly whether it is something Patriot does.

Trust your home to a Patriot.