@risingerbuilds puts exterior mineral fiber insulation to the test — and the results are wild. Using a propane torch, he compares PowerWool’s Class A, non-combustible mineral fiber board to traditional foam. The foam melts, burns, and drips within seconds… while the mineral fiber takes over 2,000°F with barely any change. Wrapped around a monopoly-framed wall, a 2" layer of PowerWool keeps the sheathing close to room temperature even after a full minute of direct flame — acting like a true fire