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.

For Construction Details and Specs Click Here

Warranty Details

CertainTeed offers three asphaltic low-slope roof system warranty options: Limited Warranty on Materials, Integrity Roof System Limited Warranty, and Integrity Roof System No Dollar Limit (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 asphaltic 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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