A: Yes it is similiar but not exact. It is our formulation.
A: They will absord a very tiny amount of water, but not enough to promoite mold or mildew growth.
A: This pad is designed as a thermal break and will support up to an 80 gallon water heater.
A: in the instructions it says 1/2" of gypsum. drywall (sheetrock) is made of gypsum so i assume that they mean a least 1/2" thick drywall
A: This is a thermal barrier designed to prevent the transfer of cold zone (concrete) from affecting the water heater.