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amakarevic 11-26-2007 06:36 PM

basement bathroom (concrete floor drain plumbing)
when laying concrete over drain plumbing, e.g. for a tub, toilet, etc., i was wondering if it is customary to box some space around the fixture outlet to allow room for posterior modifications, as patcher can be filled just before installing fixtures.

or should i be sure that everything is calibrated right 100% before pouring ?

Chris Johnson 11-26-2007 08:00 PM

Bathtubs are generally boxed out to allow for drain connection at a later date, all others are pretty much stationary and should not need movement provided you have figured out your layout. Don't forget to wrap at least a 1/2" of foam around any pipes that will be in contact with the concrete.

amakarevic 11-26-2007 09:51 PM

thanks chris
which foam should i be using ? is that the only extra thing i need to do in this scenario that you can think of ?


- a

Chris Johnson 11-26-2007 10:38 PM

I use sill gasket (sill seal) (The foam you put between the bottom plate and the concrete slab) Wrap it around a few times and your ready to go.

Marlin 11-27-2007 05:37 AM

Slide the next size larger piece of pipe over your drain line before pouring and remove it once set. This will keep the pipe out of direct contact with the cement and allow you just a little bit of movement if you need it.

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