Does foam add to the fire rating of a masonry wall?
Foams will add about 1/2hour to a masonry wall, however most manufactures will not recognize there product as a fire rated component. One manufacture claims there product will add two hours to a 12″ wall. The only problem is the testing they had been done with a wall grouted 32″ on center vertically and horizontally. This wall would add two hours with out the foam because the grouting stops the air flow within the wall.
