CertainTeed Flintglas® Ply 4 is designed for use as an interply felt for both hot and cold applied, inorganic built-up roofing systems. It is specially constructed to provide uniform strength and promote improved asphalt uniformity and adhesion between plies.

Technical Information

CertainTeed Flintglas Ply 4 is manufactured on a durable, high quality fiber glass mat which receives a coating of asphalt and is lightly surfaced with a release agent. The fiber glass base mat provides excellent strength and moisture resistance with uniform porosity to allow complete bitumen embedment without excessive bleed through.

  • Support Mat: Wet process fiber glass mat
  • Surfacing: Release agent
  • Thickness: 0.6mm (24 mils)
  • Coverage: 500 sq. ft. (5 squares)
  • ASTM D2174, Type IV
  • UL Type G1

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


CertainTeed Flintglas® Ply 4 may be applied in either hot asphalt or approved, cold adhesive such as FlintBond® depending on system design and selection. Rolls should be stored upright, off the ground, and 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. Roof decks shall provide positive drainage.

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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