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Explore our synthetic roof underlayment products and their protective benefits.
GAF certified roofing contractor installing a synthetic underlayment on a roof.

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.
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GAF roof deck protection products are Class A fire-rated underlayments, creating a formidable barrier against fire penetration.

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 
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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. Consulta UL Product iQ para obtener información sobre ensamblajes específicos. 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. Consulta la Garantía limitada para tejas y accesorios GAF, disponible en gaf.com/warranties, para conocer la cobertura completa y las restricciones.

Partes de un sistema de techo de GAF

Garantías residenciales
A pictorial representation of the layers of a GAF roofing system, highlighting the ridge cap shingles, the finishing touch that helps defend against leaks at the hips and ridges.

Tejas de caballete

El toque final que ayuda a prevenir las goteras en limas y caballetes.
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A pictorial representation of the layers of a GAF roofing system, highlighting the ridge vent layer, which helps to reduce attic moisture and heat.

Ventilación para ático

Ayuda a reducir la humedad y el calor del ático.
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A pictorial representation of the layers of a GAF roofing system, highlighting the rooftop accessories component, designed to enhance the performance of your roof system.

Accesorios para el techo

Accesorios especiales para techos, diseñados para mejorar el rendimiento de tu sistema de techo.
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A pictorial representation of the layers of a GAF roofing system, highlighting the starter strip shingles, which help guard against shingle blow off.

Tejas de hilada inicial

Ayuda a evitar la voladura de tejas.
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A pictorial representation of the layers of a GAF roofing system, highlighting the roof underlayment layer, which helps shield the roof deck from moisture infiltration.

Protección para cubierta de techo

Ayuda a proteger la cubierta del techo de las filtraciones de humedad.
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A pictorial representation of the layers of a GAF roofing system, highlighting the leak barrier layer, which helps prevent leaks caused by wind-driven rain and ice dams.

Barrera contra goteras

Ayuda a prevenir las goteras causadas por lluvias torrenciales y diques de hielo.
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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.