When performance and longevity are non-negotiable for low-slope projects, the G.A.P. Fiberglass Base G2 from A1A Wholesale Supply is the professional’s choice. Unlike organic base sheets, the fiberglass mat core is naturally resistant to moisture absorption and rot, ensuring the roof assembly remains stable under varying environmental conditions.
The G2 Type II sheet is double-coated with premium weathering-grade asphalt to provide a heavyweight moisture barrier. To ensure ease of use on the job site, the top surface is finished with white sand fines, preventing the roll from sticking to itself in the heat. This base sheet is versatile enough to serve as a high-performance vapor retarder when installed with a solid mopping of hot asphalt, making it a critical component for complex multi-layer insulation assemblies.
Product Details
Manufacturer: G.A.P. Roofing, Inc.
Material: Heavy-duty inorganic fiberglass mat with dual-sided asphalt coating.
Classification: ASTM D 4601-04 Type II.
Code Approval: Florida Building Code Approved.
Roll Width: 36 inches.
Coverage: 324 sq. ft. (3 Squares) per roll.
Weight: 72 lbs per roll.
Logistics: 20 rolls per pallet / 26 pallets per truckload.
Features & Benefits
Inorganic Fiberglass Core: Provides exceptional dimensional stability and will not rot, curl, or shrink over time.
Type II Strength: Meets the more rigorous Type II standards, offering higher tensile strength and asphalt content than standard Type I fiberglass sheets.
Dual-Sided Weathering Coating: Coated on both sides with high-quality asphalt to ensure a superior bond for BUR systems and long-term waterproofing.
Vapor Retardant Capability: Ideal for use under or between layers of roof insulation to prevent moisture migration when applied with hot asphalt.
Anti-Stick Sand Surface: Finished with white sand fines to facilitate easy unrolling and handling, even in high-temperature climates.
Applications
Built-Up Roofing (BUR): The primary base layer for professional-grade multi-ply asphalt roofing systems.
Mechanically Fastened Systems: Secured directly to the roof deck as the first layer of protection.
Hot Asphalt Applications: Applied via hot mopping for high-adhesion commercial assemblies.
Vapor Retarders: Essential for protecting roof insulation from internal building moisture.
Technical Specifications & Logistics
| Property | Value / Standard |
| Standard Specification | ASTM D 4601-04 Type II |
| FBC Approved | Yes |
| Roll Width | 36″ |
| Coverage Area | 324 sq. ft. (3 Squares) |
| Roll Weight | 72 lbs |
| Pallet Quantity | 20 Rolls |
| Truckload Quantity | 26 Pallets |
