I’ve completely demoed my bathroom, I’m going to install the alcove tub and then tile the floor. It’s a one story house and it’s a concrete subfloor. My question is: do I apply the waterproof membrane on the entire floor, under the tub? Or do I install the tub and then apply the waterproof membrane? I live near the golf coast so it is very humid and wet most of the year. That’s why I’m thinking to put the waterproof membrane down. My garage doesn’t have a moisture barrier and the concrete in there gets very wet daily. Anyone have a idea for this on a side note...?