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Basement is roughed in for shower. Hole is approx 2 feet by 2 feet. Pipe is ready for shower drain. My question is do I have to concrete over the hole and leave the pipe standing(like the concrete is poured around the toiler drain) or can I just fill the hole with stone, and frame the subfloor panels over it?
 

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I suggest that you repair the concrete slab (put plastic down before you pour the concrete. It will assist in keeping down dampness (if that is a problem) and support the shower base or subfloor and shower base. Test the waste line first.
 

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What kind of pan are you installing? Is the drain pipe 2"----A large opening is often left for a tub---but seldom for a shower---
 

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Fill with gravel----then,as you are installing, top the hole with some masons mortar----

You will want to put some mortar under the pan to properly support it---there is an advantage to having a bit of wiggle to the pipe===it's much easier to set the drain if the pipe can be moved a bit.
 
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