CertainTeed's Flintlastic® APP Base T is designed for use as a base sheet for APP modified bitumen roofing systems. It is suitable for use in the construction of various types of membranes for both new construction and reroofing, over a variety of substrates. Flintlastic APP Base T will provide additional strength and improved handling and pliability when used as the first ply over nailable, non-nailable and insulated substrates.

Technical Information

CertainTeed's Flintlastic APP Base T is produced with a high quality fiberglass mat that receives a coating of superior-grade APP modified bitumen compound.

  • Top Surface: Smooth-Talc finish
  • Back Surface: Torchable polyethylene film
  • Dimensions: 39 3/8" x 65' 4"
  • Coverage: Two squares
  • Thickness: 2.0mm (80 mils)
  • ASTM D6509


Flintlastic APP Base T is intended for mechanically fastened and heat-weld applications only and should not be exposed to adhesives or solvent-based materials. 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.

Additional specifications and precautions are contained in 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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