Certainteed Glasbase Base Sheet, 3 Square Roll, Gray

CertainTeed Glasbase Base Sheet is a gray asphalt base ply with glass reinforcement for built-up and low-slope roof assemblies. Each order is one roll covering 3 squares. Install it as the foundation layer beneath additional BUR plies or cap sheets.

Key Features:

• Glass reinforcement: Glass-based asphalt sheet construction for a stable base ply.
• 3 squares per roll: Each roll covers approximately 3 squares of roof area.
• Gray sheet: Gray asphalt sheet coloring.
• Low-slope assemblies: Built for built-up roofing and low-slope membrane systems.
• Efficient roll format: Roll format speeds up base layer installation.

Specifications Table:

Coverage & How Much You Need:

One roll covers approximately 3 squares (300 sq ft) before laps; add rolls for side and end laps and cut-in losses per the project specification.

Fit and Compatibility:

Use as the base ply in CertainTeed built-up or low-slope asphalt assemblies under subsequent plies or cap sheets; mopping asphalt and fasteners are specified or sold separately.

Frequently Asked Questions (FAQ):

Q: What is included?
A: One gray Glasbase base sheet roll covering 3 squares; adhesives and fasteners are not included.

Q: How much area does one roll cover?
A: About 3 squares before laps; order extra to account for overlap.

Q: How is it attached?
A: Per the assembly specification, typically nailed or set in hot asphalt as the base layer.

Q: What reinforcement does it use?
A: Glasbase uses glass-reinforced asphalt construction for dimensional stability.

Q: What does it pair with?
A: Pair with CertainTeed BUR ply sheets or cap sheets to complete the membrane assembly.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Glass-reinforced base sheets resist wrinkling and help keep the membrane flat during interply mopping. Verify deck type and fastening pattern before unrolling, and lap base sheet edges the specified amount so interply asphalt bonds fully. In cold weather, store rolls indoors so the asphalt remains workable.

Handle heavy rolls with proper lifting technique and, when installing over hot asphalt, follow hot-work and fall-protection procedures.

Order CertainTeed Glasbase Base Sheet 3-square rolls for a stable base ply on your low-slope project.