Shower stall subatrate
I'm going to have a shower installed using Cultured Marble for the walls. The manufacturer tells me that the substrate mater does not matter, ie: standard sheetrock will do since the cultured marble product is waterproof. What type of substrate would be best for this installation? Should I be using a Hardyboard type of cement board, greenboard, standard drywall, or is there a more appropriate backer to use for a solid wall shower solution?