Asphalt shingles shield your roof against wind, water, hail and — if they have Scotchgard™ Protector — the ugly black streaks caused by algae. But what’s installed below the shingles is just as important to preventing leaks: underlayment.

Underlayment is a layer of material that repels water and protects the wooden roof deck from moisture during and after shingle installation. The two most common types are felt and synthetic.

Watch the video to learn more about this crucial part of your roof. Then, check out Atlas Roofing’s Summit® 60 and Summit 180 synthetic underlayments, as well as Gorilla Guard® 30 and Gorilla Guard Spec 30 engineered felt underlayments.

For information about other Atlas Roofing products, visit atlasroofing.com/roof-shingles.