Testing The Burn Ability Of Insulation In Wall

The majority of spray foam using your house would have a fireproofing
additive and would have trouble Catching Fire but in this example is if
you have a type without the additive such as the great stuff. A vapor
barrier is very important in a wall so just the rockwool batt insulation
it's more commonly used for an attic floor not a wall. Fiberglass
proved to be pretty safe in the test but if you're worried they make
fiberglass with a aluminum radiant / vapor barrier. They do make fire
retardant spray foam but it's usually for commercial application but I
don't see why you couldn't pay that company to put it in your house but
you're going to pay. They make fire retardant paint especially for spray
foam which I personally can't see it working very well since the heat
of the fire will cause the foam to melt behind it leading to the
collapse of the paint exposing it to Fire and on the other hand it's
most likely the firewood start behind the Paint as a slow smolder first
in the wall