Blowtorch test of Tuff-R insulation board
Dow’s Tuff-R insulation board is a polyisocyanurate insulation with aluminum foil backing on both sides. It’s primary function is as insulation in new or retrofit construction. Since it’s reasonably rigid, water resistant, and insulating, I (and many others) have considered it for temporary structures like for camping in environments with unpleasant temperatures (i.e. deserts or wintertime).
One concern is what happens when it burns? Flame suppression ratings only go so far. So, I decided to test a sample against my blowtorch (MAPP gas, FYI). As expected, it burned readily. It did not, however, maintain its own flame without additional heat, so small embers probably do not pose much of a threat, whereas proximity to a fire would.
As expected, once the aluminum sheath is compromised, the material is greatly weakened — just as if one had cut a line through the sheathing to snap it.
Duration : 0:0:45
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