I have an existing basement powder room with a toilet and sink. I
would like to add a bathtub with shower or just a shower. The drain
for the sink is exposed and goes right to the floor. Is there a tub or
showerpan drain system that would allow me to tap into the existing
sink drain without opening the concrete floor?
You can get a fiberglasss shower base which has clearance above the
floor to allow a 2" drain to pass thru the base on top of the floor.
You would have to chop some floor out to permit installation of
the trap though.
NOTE: tapping into the sink drain won't be legal and may cause
trap siphoning troubles. A mechanical vent *might* solve that
but you could be in over your head...
I was going to do the same thing you are thinking of, but I decided to go
ahead and trench it in properly. It wasn't difficult or very messy. Do it
right and you'll be glad in the long run. I'm not experienced at drainage
so I got the plumber to come in and mark where he needed me to trench, which
included digging under a wall. You will probably need to dig 8 inches wide
and 8 inches deep. The hardest part is carrying the debri up the steps and
disposing of it. Then carrying an equal amount of sand down to pack under
and around the new plumbing. Then the plumber came in and did his thing in
about one hour (I had the shower base already fitted in for him to line up
with the pipe. Of course you will have to repour the concrete. I used a
good quality ready-mix and a large plastic tub to mix it with water.
I saved myself a heap by doing the non-plumbing bull work myself.
You'll be glad you did it properly.
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