When projects demand a higher standard of durability than standard roll roofing, the G.A.P. 65# Smooth Organic from A1A Wholesale Supply is the definitive choice. This heavyweight organic sheet is thoroughly saturated with asphalt and then armored on both sides with premium weathering-grade coating. A fine mineral surface is applied to the top to ensure the roll remains easy to handle and unroll without sticking, even in humid or high-heat environments.

The 65# series is highly versatile. In commercial settings, it serves as a high-strength base sheet over flat decks or insulation. In residential roofing, it is the “gold standard” for waterproofing critical high-water areas like valleys, roof edges, and transitions. When installed with hot asphalt, its dense composition acts as an exceptional vapor retardant, preventing internal moisture from compromising the roof assembly.

Product Details

• Manufacturer: G.A.P. Roofing, Inc.

• Material: Saturated organic felt with dual-sided weathering-grade asphalt coating.

• Classification: ASTM D 6380 S Type III (formerly ASTM D224-98).

• Roll Width: 36 inches.

• Coverage: 108 sq. ft. (1 Square) per roll.

• Weight: 35 lbs per roll.

• Logistics: 20 rolls per pallet / 26 pallets per truckload.

Features & Benefits

• Double-Coated Protection: Weathering-grade asphalt on both sides creates a superior moisture-proof seal that resists cracking and degradation.

• ASTM Certified Performance: Meets ASTM D 6380 S Type III standards, ensuring consistent material quality and thickness for code-compliant projects.

• Enhanced Vapor Defense: Provides an industry-leading vapor barrier when used in conjunction with hot asphalt applications.

• Superior Valley Protection: Offers a thicker, more resilient alternative to standard underlayments for residential valley lining and eave protection.

• Anti-Stick Finish: Mineral surface fines prevent “picking” or tearing when unrolling, saving time and reducing material waste on the job site.

Applications

• Built-Up Roofing (BUR): Ideal as a high-strength base layer for multi-ply asphalt roofing systems.

• Residential Waterproofing: The preferred choice for lining valleys, roof-to-wall transitions, and low-slope porch roofs.

• Vapor Retardant: Used in commercial roofing assemblies to manage moisture migration.

• Low-Slope Roofing: Suitable for any flat or low-pitch application requiring a smooth-surfaced asphaltic base.

Technical Specifications & Logistics