Replies

1. Expert Member
   Dana Dorsett | Dec 21, 2020 05:12pm | #1

   It depends on the door's design. Can you post a picture?

2. 
   charlie_sullivan | Dec 21, 2020 05:18pm | #2

   Buying foam insulation boards, cutting them, and gluing them to the door is cheaper and gives you more options than buying a garage door insulation kit. Leaving foam exposed is considered a fire hazard, and is often against code, but it's not clear that it's a major hazard or an actual code issue on a garage door. "Themax" polyiso insulation carries the best fire rating of any foam board insulation, so that could be a good choice. You could also use mineral wool boards, but then you'll most likely get condensation in the inside surface of the steel. A thin mineral wool board over a thick foam board would be more fire safe than foam alone and might avoid the condensation problem, if the foam is thicker than the mineral wool. But I don't know that you can get thin mineral wool boards, and I also don't know how you'd attach them.

   So probably "thermax" polyiso is the way to go.

3. 
   JC72 | Dec 22, 2020 07:56am | #3

   The best garage door is one which isn't leaky around the edges.

4. GBA Editor
   Kiley Jacques | Dec 22, 2020 12:25pm | #4

   Hi Jasmine,

   Here are a few Q&A threads with links to resources that might help inform your course of action: Ideal garage door insulation and Garage door insulation.