Fire Blocking in Basement
12/27/2020 at 11:05:22 AM
I am finishing my basement. I have blown foam insulation on the foundation and the stud framing. For the horizontal and vertical fire block I usually use 1/2" drywall but I am wondering if you can use Rockwool SAFE'n'SOUND Insulation for the fire block. Would make life much easier for sure.
12/27/2020 at 5:12:19 PM
You have to use fire rated drywall where code requires. Any other location on exterior basement walls I use green board.
12/27/2020 at 10:52:50 PM
No; you need to use drywall. Even if mineral wool is a good sound barrier and its not flammable, code doesnt allow it to be used as fire block or fire seperation.
12/28/2020 at 9:15:47 PM
Your question is not entirely clear. Foamed plastic insulation is required to be protected where exposed; also rim joists require protection over foamed plastic insulation if the joist space acts as a return air plenum.
The Code lists a number of materials acceptable for fire blocks and also to cover foamed plastic insulation however Roxul insulation is not listed for either use; most commonly 1/2" regular drywall is used to protect foamed plastic insulation.
Without knowing more specifics of your question best thing is to confirm with your local municipality.
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