Vaporstop® is a vapor retarder designed to protect roof deck insulation from condensation damage. Used for mechanically attached metal roofs or non-sloped roofing installations (not to exceed 1-in-12), Vaporstop protects underlying insulation from moisture.

The product is comprised of two layers of durable Kraft paper laminated with asphalt. Vapor stop is reinforced with fiberglass for added strength.

Vaporstop is tested for conformance to specification and is monitored by Factory Mutual.

Vaporstop is available in 2 sizes:

  • 96” x 128 lineal feet covering 1024 square feet
  • 96” x 256 lineal feet covering 2048 square feet