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 backs its commercial roofing systems with the confidence of three warranty choices:

Limited Product Warranty

NDL Roof Membrane Limited Warranty*

Full System NDL Limited Warranty*

Owners and specifiers who choose the NDL or Full System NDL warranty options have the added security of manufacturer involvement in the sometimes difficult process of contractor qualifying and workmanship inspection. Consult with the roofing contractor and your CertainTeed commercial roofing territory manager to decide which CertainTeed warranty is best for your building or project.

*NDL warranties are not available on all specifications and are only available through CertainTeed Gold and Silver Star Contractors

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