CertainTeed Flintlastic® Ultra Poly SMS Base Sheet is designed for use as a base sheet for both hot and cold applied SBS modified bitumen or built-up roofing systems. It is suitable for use in the construction of various types of roof membrane assemblies for both new construction and reroofing, over a variety of substrates. Flintlastic Ultra Poly SMS Base Sheet will provide additional strength when used as the first ply over nailable, non-nailable and insulated substrates. In addition, it will perform as a venting base sheet when spot mopped over approved insulations. Also suitable as a mid ply in multi-layer systems or as a torched-down base sheet over a gypsum coverboard.

Technical Information

CertainTeed Flintlastic Ultra Poly SMS Base Sheet is manufactured using a high performance, non-woven polyester mat which is impregnated and coated with a superior grade modified bitumen compound.

  • Support Mat: High performance, puncture and tear resistant, non-woven polyester mat
  • Top Surface: Fine sand
  • Back Surface: Fine sand
  • Dimensions: 39-3/8" x 32' 10" (100 sq. ft./roll)
  • Coverage: One Square
  • Thickness: 3.7mm (148 mils)
  • ASTM D6164, Grade S, Type I

For additional technical resources please refer to the CertainTeed Commercial Roof Systems Manual or click on the Technical Information link located on the left navigation area.


CertainTeed Flintlastic® Ultra Poly SMS Base Sheet may be mechanically attached or applied in either hot asphalt or approved cold adhesive such as CertainTeed's FlintBond® or torched over approved substrates, depending on system design and selection. 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 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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