Ridge cap shingles
The finishing touch that helps defend against leaks at the hips and ridges.
Synthetic Roof Underlayment
Explore our synthetic roof underlayment products and their protective benefits.
GAF QuickMeasure™ reports
Gain access to a complete aerial roofing measurement tool that delivers roof measurements in under 1 hour for single-family homes, and under 24 hours for multi-family and commercial properties. Terms and restrictions apply. Visit gaf.com/QuickMeasure for details
Timberline HDZ® shingles
GAF’s #1-selling shingle now offers two distinct color collections — High Definition® colors for classic elegance or Bold Definition colors for a striking statement.
Why choose a GAF synthetic roofing underlayment?
As North America’s largest roofing and waterproofing manufacturer, we engineer each product in our extensive underlayment portfolio to function as vital components of complete roofing systems. Our underlayments meet unique project-specific needs, including resistance to rain, snow, ice, fire spread, wind uplift, and more.
Underlayment’s importance in Class A roofing fire ratings
As fire-prone regions expand and building codes tighten, the selection of a roofing system with a Class A fire rating has become critical for many projects. GAF’s entire line of synthetic underlayments1 can be used to achieve a UL 790 Class A roofing fire rating as a component of UL Classified roofing assemblies.2
1 Includes, Feltbuster, Tiger Paw and Deck Armor roof deck protection.
2 Achieves ANSI/UL 790 Class A roofing fire rating as a component of UL Classified roofing assemblies. Applies only to products sold in packages bearing the ANSI/UL 790 Class A classification statement. Refer to UL Product iQ for specific assemblies. Testing performed under controlled laboratory conditions by UL Solutions. GAF makes no express or implied warranty about the fire performance of these products. Fire damage is not covered under the limited warranty. See GAF Shingle and Accessory Limited Warranty available at gaf.com/warranties for complete coverage and restrictions.
Rooftop accessories
Specialty roofing accessories designed to enhance the performance of your roofing system.
Looking for support?
Contact your local rep
Need help finding a Territory Manager near you? Our TM Locator is here to help.
Find a TM
Customer support
All inquiries regarding product order placement, product availability, shipment tracking, and jobsite deliveries
Contact GAF
Synthetic roof underlayment FAQs
Synthetic underlayments use polymers such as polypropylene and polyethylene to create a weather-resistant barrier against the elements.
Synthetic underlayments are engineered to create a barrier against moisture when installed properly.
While most underlayments are rolled over roof decks horizontally, nailed in place, and overlapping, it’s important to note that each type of underlayment is different, therefore may call for slightly different installation procedures. It’s important to follow applicable instructions closely.
Several GAF roof underlayments are engineered to meet the rigorous demands of a UL 790 Class A rating. Look for that rating information on product packaging, or speak with your GAF representative for more information on rated products.