I'm re-doing a shower using an acrylic/fiberglass base. The instructions say to put "mortar cement" under the base. Makes sense, there were lumps of grey rock-like substance under the one I pulled out. Problem is, I can't translate "mortar cement" into anything I can buy at HD, etc.
My searches tell me to use the same mortar as laying bricks, or to NOT use the same stuff, use regular concrete mix, use regular mix with sand added, don't use regular mix as it will wreck the plastic, etc etc etc. I think I know less now than when I started.
Can somebody tell me what it should say on the bag at the building center? Brand names are fine, if it isn't available around here at least I can ask for equivalent product.
Thanks, Red