CertainTeed Flintlastic® Base 20 T is a fire rated base sheet utilized in two-ply or multi-layer SBS 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 T Sheet is reinforced with a touch fiber glass fabric.

Technical Information

CertainTeed Flintlastic® Base 20 T 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 33' (100 sq. ft.)
  • Thickness: 3.0mm (120 mils)
  • Coverage: One square
  • ASTM D4601, Type II
  • ASTM D6163, Grade S, Type I

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


CertainTeed Flintlastic® Base 20 T Sheet is intended for torch application. Rolls should be stored upright, off ground, 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.

Warranty Details

CertainTeed offers four low-slope roof system warranty options: Limited Warranty on Materials, Limited Warranty on Systems, No Dollar Limit (NDL) Limited Warranty and Full System 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 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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