Glass Base

Glass BaseLeakBarrier Glass Base is a highly versatile glass fiber reinforced sheet coated with superior quality weathering-grade asphalt.


LeakBarrier Glass Base is designed for use as the initial or base ply in built-up and modified bitumen roof systems. It is ideal for applications involving mechanical fasteners, hot asphalt or cold adhesives.

Features and Benefits

  • Use in built-up and modified bitumen systems
  • Cost-effective
  • Versatile sheet; can be used in a variety of applications
  • Easy to handle
  • Good durability
  • Fiberglass reinforcement resists the rot prevalent with saturated felt
  • Low moisture absorption
  • Meets ASTM D4601 Type II
  • UL Classified (R 13228) for use in class A and B roofs


  • Store rolls in a dry location, protected from the elements
  • Do not store rolls in direct sunlight for prolonged time
  • Store rolls upright
  • When storing two pallets high, position a plywood sheet between pallets

General Precautions

  • Install Glass Base in strict compliance with applicable building code
  • Keep rolls clean and free of moisture prior to installation
  • Follow Occupational Safety and Health Administration (OSHA) safety standards; use common sense measures and adequate precautions to prevent accidents
  • Ensure proper ventilation of the attic

Surface Preparation

  • The substrate shall be clean, dry and free of voids prior to installing Glass Base


  • For ease of application, cut the roll into manageable lengths prior to use
  • Follow standard roofing practice when installing Glass Base


Property Typical Value Reference Test
High/Low temperature Unrolling Pass ASTM D1970
Breaking Strength 70 lbf/in ASTM D146
Moisture Content 0% ASTM D146
Pliability Pass ASTM D146
Ash Content Pass ASTM D228

Product Data

Width 36 in.
Length 108 ft.
Gross Coverage 300 sq. ft.
Weight 72 lbs. (nominal)
Rolls Per Pallet 22


LeakBarrier Glass Base is warranted to be free from manufacturer's defects.

Note: All statements, information and data, given herein are believed to be accurate and reliable but are presented without guaranty, warranty orresponsibility of any kind, expressed or implied, except as may be indicated otherwise in this literature.

Quick Reference Product Guide

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