Westlake Royal GatorSeal Self-Adhering Modified Asphalt Underlayment, 65 ft. x 3 ft. Roll, Gray

Westlake Royal GatorSeal is a heavy duty, polymer-modified bituminous underlayment on a fiberglass mat that self-adheres to the deck, seals around nail penetrations, and protects against ice dams and wind-driven rain. Each roll is approximately 65 ft. x 3 ft., about 2 squares, with a granulated gray surface.

Key Features:

• Seals Around Nails: Modified asphalt seals around nail penetrations to keep water out.
• Ice & Water Barrier: Protects against ice dams and wind-driven rain.
• Self-Adhering: Self-adhesive underside bonds directly to the deck.
• Fiberglass Mat: Manufactured as a fiberglass mat impregnated and coated with modified asphalt.
• Granulated Surface: Granulated top surface for handling and traction.
• Two Squares Per Roll: Rolls are approximately 65 ft. x 3 ft., covering about 2 squares.

Specifications Table:

Coverage & How Much You Need:

One roll measures approximately 65 ft. x 3 ft. and covers about 2 squares (200 sq. ft.) before laps. Follow the GatorSeal installation instructions for side and end lap requirements when estimating rolls.

Fit and Compatibility:

Intended for use as underlayment beneath Westlake Royal roofing systems and other roof coverings per the manufacturer’s installation guide. Pair with the specified drip edge and starter products; self-adhered application requires a clean, dry deck.

Frequently Asked Questions (FAQ):

Q: What is included in one roll?
A: One roll of GatorSeal underlayment, approximately 65 ft. x 3 ft., about 2 squares, in gray with a granulated surface.

Q: How does it stop leaks at fasteners?
A: The polymer modified asphalt seals around nail penetrations as fasteners pass through.

Q: Where should it be installed?
A: As underlayment where protection from ice dams and wind-driven rain is needed, per the installation instructions.

Q: Does it need separate adhesive?
A: No, the underside is self-adhesive; apply to a clean, dry deck.

Q: What is it made of?
A: A fiberglass mat impregnated and coated with modified asphalt, with a self-adhesive underside and granulated surface.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Use GatorSeal in valleys, eaves, and other ice-dam and wind-driven-rain exposure zones, and across the full deck where the roof covering manufacturer calls for a self-adhered underlayment. Roll out only as much material as you can cover the same day, and roll firmly to work out wrinkles for full adhesion. Keep the granulated surface dry and clean before the covering goes on.

Self-adhering membranes are slippery, especially when wet or hot; wear boots with good traction and avoid walking on exposed GatorSeal.

Order Westlake Royal GatorSeal Underlayment rolls for nail-sealing, ice-dam protection on your next roof.