CertainTeed Flintlastic® Poly SMS Base Sheet is designed for use as a base sheet for both hot and cold applied, modified or built-up 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 Poly SMS Base Sheet will provide additional strength when used as a first ply over nailable, non-nailable and insulated substrates. In addition, it will perform as a venting base sheet when spot mopped over plastic foam type insulations. Also suitable as a mid ply in multi-layer systems.

Technical Information

CertainTeed Flintlastic Poly SMS Base Sheet is manufactured on a high performance, non-woven polyester mat which is impregnated and coated with a superior SBS modified bitumen compound and is lightly surfaced with a mineral release agent. The polyester base mat provides excellent strength, tear and puncture resistance. Flintlastic Poly SMS Base Sheet is pliable and will confirm to most surfaces for ease of application.

  • Support Mat: High performance, strength and tear resistant non-woven polyester mat
  • Surfacing: Mineral release agent
  • Dimensions: 39-3/8" x 64' 3" (200 sq. ft.)
  • Coverage: Two Square
  • Thickness: 2.0mm (80 mils)
  • ASTM D4601, Type II

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


CertainTeed Flintlastic® Poly SMS Base Sheet may be applied in either hot asphalt or approved cold adhesive such as CertainTeed's FlintBond®, depending on system design and selection. Rolls should be stored upright, off ground, completely protected from 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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