Fireproof foam

[325abn]

Does anybody know of a expanding spray foam that is fireproof when cured? I am looking to seal some space in the back of my arch that I can't really get my hand to.

[DrTimPerkins]

Does anybody know of a expanding spray foam that is fireproof when cured? I am looking to seal some space in the back of my arch that I can't really get my hand to.

http://www.touch-n-foam.com/firebreak.php

Not sure it'll deal with the heat at the back of the arch. This stuff is fire-resistant, not fire-proof.

[Paperman]

They make a fire blocking foam that is flame rated. In my opinion it's not fire proof but is self extinguishing. It's used allot in able tray penetrations or other areas when you want to seal from fire. Could you inject some concrete in there?

[325abn]

Thanks for the link, I did not even see that when I searched but you are you correct it is resistant. It may work though as I don't think any flame reaches back the far.

[325abn]

I could spray this foam in then stuff some ceramic blanket in front of it.