Posted by Doug Cartwright [50.37.86.217] on Saturday, February 08, 2014 at 01:46:01 :
In Reply to: O/t Foam board flammability ? posted by Perry [108.5.241.32] on Friday, February 07, 2014 at 21:28:06 :
Most likely Polyisocyanurate. It will not support combustion,but is toxic when burning in a house fire.(SIANIC GAS)Most codes require you to cover it for this reason.
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