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How to make a shower pan
Ensure your floor can support the weight of a shower before beginning construction because the concrete can be quite heavy.
It may be a good idea to reinforce the floor below the shower pan with exterior grade plywood.
Prepare your shower drain prior to pouring the concrete or hire a professional plumber to install the drain you plan to use.
You will need a two-piece drain. One piece of the drain will sit flush with the floor and connect to drainage pipes beneath the surface.