About ThermaCal® 2 Ventilated Roof Insulation Panels

Perfect for structures with cathedral ceilings, glue lam, post & beam construction and conditioned attic spaces, they help insulate against heat drive into the living space/conditioned space under the roof while serving as a nailable base. In addition, they exhaust excess moisture before it can condense in the deck or roofing system. These panels can be installed on top of structural wood or steel sloped roof decks (Contact GAF for other acceptable decks).

  • Panel Configuration:  Two layers of sheathing, air space, and polyiso foam insulation.
  • Sheathing Options:  Top Layer - 7/16" (11.1 mm) OSB nailing surface (standard); optional 5/8" (15.9 mm) and 3/4" (19.1 mm) OSB or plywood.  Fire-treated options also available.  Bottom Layer - 7/16" (11.1 mm) OSB. Contact GAF for additional information.
  • Solid Wood Spacer Blocks:  Positioned 12" (305 mm) or less apart in all directions minimize the chance of deflection or nail back-out.
  • Optional Air Space and Polyiso Thicknesses Available:  Contact GAF for additional information.

Features & Benefits

ThermaCal® 2

Get automatic Lifetime Protection on your entire GAF roofing system

When you install any GAF Lifetime Shingle and at least 3 qualifying GAF accessories, you'll automatically get a Lifetime limited warranty on your shingles and all qualifying GAF accessories*.

Product Documentation