The shower pan liner membrane is usually a vinyl sheet that’s installed in the mortar base of the shower. All kinds of liners have been tried in the past, including liners of steel, iron, copper, lead and even tar. None of these materials were completely satisfactory. The currently used liner sheets seem to be the best solution yet.

Don’t even think about building a masonry tile shower without a liner membrane. Why not? Well, you see, a shower floor is not waterproof. Water seeps right into the grout of the floor and then down into the shower base. The only thing that keeps the shower leak-proof is the liner layer. It’s made to catch all the water that seeps into the floor and route it to special drain holes built into the floor. (more…)

The tile shower pan built the traditional way is built from the bottom up in layers. The heart of the pan is the vinyl membrane that really stops any water that makes it past the shower floor. You do realize that shower floors naturally leak??? The pan is built to catch that water. After the liner membrane is in place, a second layer of mortar goes over the liner and it’s the base for the tile. Here’s how it goes on.

The second mortar layer of the pan is constructed of what’s called deck mud. It’s a simple mix of portland cement, sand and water. That’s all. It’s put on and then formed using a flat trowel and pieces of boards. The mortar is sloped at about 1/4 inch per foot to make sure the water moves right to the drain. (more…)