There is no insulation value to this stove board. It doesn't say it on the packaging (which says that it is for wood stoves). In the instructions it states: R-value = 0. If you need a stove board, check out the type 2 stove boards from Hy-C. I've tried 3 times to post a negative review on the Lowes' site. They keep getting rejected. Hopefully this last one will go through.