How do I plan for a shower rough in a cellar floor that is going to be poured with concrete?

You have to know the size of the shower. Also is it a pre-formed base or a built on the job base?

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Originally Posted by tekelly

How do I plan for a shower rough in a cellar floor that is going to be poured with concrete?

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As Letmetellu asked, we need more details before we can answer. But I cfan give you some general information. If you're planing to install a manufactured base then measure where drain will set on the cement and cring the trap raiser up there. Make the raiser a few inches above the pour and cement around it.
If you're planing a custom tile shower then make a shower dap out in the form of a square recessed a few inches and bring the raiser up where you wish the drain to set. Cement the floor of the dap out and install a flange type shower flange,(see image). You may then proceed to pan the shower and start to mud it in. Good luck, Tom