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GlasBase™ Base Sheet is CertainTeed's workhorse, non-modified base sheet, suitable as a starter course under BUR ply sheets or modified asphalt cap sheets applied with a torch, hot asphalt, or cold adhesive such as FlintBond® Brush. This 40 mil permeable base sheet is manufactured with a strong, dimensionally stable fiberglass reinforcement. GlasBase is most commonly mechanically attached but may serve as a non-penetrated base ply when mopped with hot asphalt or FlintBond® Brush cold adhesive. In addition, it will perform as a venting base sheet when spot mopped over plastic foam type insulations. Reach out to your local CertainTeed Territory Manager to request a sample and demonstration of GlasBase Base Sheet.

Features & Benefits

Quick Specs
• Permeable, non-modified ply Sheet • Fiberglass reinforcement • 75 lbs. • 3 Squares • 1.0 mm (40 mils)
• Meets or exceeds D4601, Type II, UL G2 • Strong
Why Buy
• Workhorse, economical base sheet • Budget-conscious 2-ply modified bitumen roof systems where 12-year warranty durations are desired
• Standard asphaltic membrane warranty durations between ten and twenty-five years • Credentialed Contractors can increase warranty durations by 25% with an Integrity Maintenance Agreement • Product and Product/Workmanship options: Limited Warranty on Materials, Integrity Roof System® Limited Warranty, and Integrity Roof System No Dollar Limit (NDL) Limited Warranty Warranty durations are based on a combination of system specification and product selection.
Three rolls of rolled and unrolled Glasbase Base Sheet on a white background.

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