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 information.

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.

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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