I am installing rigid foam and am considering fire barriers.
Based on this chart, it appears the following are currently accepted fire barriers in occupied space:
Wood Panel / Particle Board / Plywood – 15/32″
Drywall – 1/2″
Steel Base Metal – .016 (?)
Aluminum Base Metal – .032 (?)
Mineral Fiber Insulation – 2″
Thermax insulation is also apparently an approved barrier in attics and crawl spaces, but not occupied spaces, so perhaps it is not as good as the other options.
Two questions. First, is there an overview of the barriers, as to what works best at preventing the spread of fire? Are there any other options?
Second, is steel or aluminum used indoor?This will be a large area, not a small area such as only the rim joists. Drywall is heavy, don’t know the weight of the wood.
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