CertainTeed Flintlastic® Base 20 is a base sheet utilized in two-ply or multi-layer modified bitumen fire rated roofing systems. It is suitable for use in the construction of various types of roof membrane assemblies for both new construction and recover, over a variety of substrates. Flintlastic Base 20 is reinforced with a tough fibrous glass fabric.

Technical Information

CertainTeed's Flintlastic® Base 20 Sheet is manufactured on a durable, high quality fiber glass mat which receives a heavy coating of weathering grade, rubberized asphalt.

  • Support Mat: Wet process fiber glass mat
  • Surfacing: Mineral release agent
  • Dimensions: 39 - 3/8" x 49' 6"
  • Coverage: One and a half squares
  • Thickness: 2.3mm (92 mils)
  • ASTM D4601, Type II
  • ASTM D6163, Grade S, Type I

For additional technical information please refer to the CertainTeed Commercial Roof Systems Manual.


CertainTeed Flintlastic® Base 20 Sheet is intended for hot asphalt application or approved cold adhesive such as CertainTeed's FlintBond®. Rolls should be stored upright, off the ground, and completely protected from the weather. Roof decks shall be structurally sound, dry, smooth and meet or exceed minimum requirements of the deck manufacturer, local code and CertainTeed. For detailed installation instructions please refer to the CertainTeed Commercial Roof Systems Manual or the Flintlastic Application Handbook.

For Construction Details and Specs Click Here

Warranty Details

CertainTeed offers three asphaltic low-slope roof system warranty options: Limited Warranty on Materials, Integrity Roof System Limited Warranty, and Integrity Roof System No Dollar Limit (NDL) Limited Warranty. CertainTeed warranty durations are based on a combination of system specification and product selection. Please download an overview of these warranty options for details. Consult with your contractor or CertainTeed Territory Manager to determine which warranty is best for your project.     

CertainTeed offers standard asphaltic low-slope roof system warranty durations between ten and twenty-five years. Additionally, Gold Star Contractors can increase warranty durations by 25% by engaging in an Integrity Maintenance Agreement with their client.

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