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willy1094 02-25-2009 03:21 AM

Basement Bathroom remodel
I purchased a bi-level that had a full bathroom in the lower level. I'm sure it was installed by a previous owner because they raised the floor under the shower and toilet for the plumbing instead of installing under the slab. Now I would like to do it right and install the plumbing under the slab. I've drawn out how I would like to lay this out but not sure of a couple issues. One issue would be that I indend to install the shower drain at a location that is down stream from all other fixtures in the house (including two toilets). Since a toilet should not drain up stream of shower/sink, is there a way to make this connection that is ok? Here is my layout drawing, let me know the good and the bad. Thanks in advance for the help!

willy1094 02-25-2009 03:29 AM

Oh, and in my layout I'm wet venting the toilet via the stack. Is this ok or should I include a dry vent? If so, could I get away with tying in with the other 1 1/2" vent or will I need to run 2" all the way up to the attick as well? How large would the vent from this level up to the attick have to be to vent all these fixtures together? Thanks again!

Bob Mariani 02-25-2009 05:44 AM

you need a 2" vent in any case

PLUMBINGITALL 02-25-2009 12:01 PM

i would increase the 1 1/2 to a 2" vent were the washer and sink connect and you can carry the 2" out or tie it into the 3" vent and penatrate the roof with the 3" vent. The wet vent is the best vent for the toilet and no need for a dry vent

zosoplumber 02-25-2009 05:51 PM

I that 3" stack rises up through the house with no other offset fittings you may use it as a vent, but if it were installed just to catch waste from above then no, if there is anyway of throwing a 3x2 combo just before the toilet and running a 2" line back to you shower and dry vent, that would be better, then your shower is now up stream of the toilet and you have eliminated the need for an extra vent for the toilet as long as where you put the dryvent is not more than 4' from the toilet line and not more than 6' away from the showers trap, and remember all dry vents must be plumbed vertical or no more then 45degree angle going vertical, dry vents must stay dry.

willy1094 02-26-2009 04:18 AM

thanks for all the replies! I'm not sure I'd be able to work out the show being attached/run up to the toilet because it would not leave enough room for the 1/8-1/4 in per foot slope. The stack takes a 90 degree only about 4' under the slab. The stack does go up and out and I'm pretty sure it goes straight out (that would be easy enough to check). There is a 1 1/2 vent that runs up to the attick and attaches to the 3" stack. I could remove this and change it over to a 2" vent but may have to remove walls upstairs. If that is my only option then that's what I'll have to do.

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