Black Diamond® Base Sheet is a heat-activated, self-adhered base sheet for hybrid roof systems with a torch-applied cap or cap set in hot asphalt for modified bitumen or built-up roofing systems. It is suitable for use in both new construction and reroofing over a variety of substrates, including but not limited to insulation, concrete and plywood/OSB.

Black Diamond Base Sheet delivers measurable labor savings over traditional fully adhered asphaltic membranes without compromising waterproofing protection. Black Diamond Base Sheet also may be used as a vapor retarder under roof insulation and may be left exposed for up to six months without asphalt degradation. This versatile base ply can be used in CertainTeed two-ply, low-slope roofing systems for up to 20-year warranty durations

Technical Information

The following information represents typical average properties of Black Diamond® Base Sheet:

  • Support Mat: Wet process fiber glass mat
  • Surfacing: Fine black mineral particles
  • Dimensions: 39-3/8" x 68' 7" (225 square feet)
  • Coverage: Two Squares
  • Thickness: 1.4mm (60 mils)
  • ASTM D1970, D6401, Type I

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


Black Diamond® Base Sheet is attached by a self-adhering method. It is not intended for attachment with hot asphalt, cold adhesive, coal tar pitch, or mechanical fasteners. Rolls should be stored upright, off the ground, and completely protected from the weather. Roof decks shall be structurally sound, dry, and 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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