Have a cargo trailer that could be used to make a heat box inside. Appears that blue Dow board is not suitable, as it will only tolerate less than 160 f. So was searching online for a heat resistant insulation board, and ran across this R Max, sold at Home Depot. They have sheets of 2" for 31.45 each, 4x8, R factor of 13.1, only heat temp mentioned is it will burn at 240 f. Is there another foam board I should be looking at?