ThermaCal® 2 Specs
ThermaCal® 2 Docs
ThermaCal® 2 Videos
Why ThermaCal® 2?
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).

See how this product can help you meet your environmental goals. View sustainability information here.

Reduced Heat Loss
Exclusive tongue-and-groove design minimizes heat loss up through the panel joints

Fully-Machined Panel
Pre-spaced sheathing eliminates the need for H-clips and allows for sheathing expansion

Exceptional Airflow
Unique spacer pattern maximizes airflow ("upventing") and reduces hot spots
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*.
Where to buy
Find a GAF distributor near you.