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
  • 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.

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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