"Kevin Ricks" wrote in message
t...
I want to put a utility sink in my garage. The main reason is to have
sof****er hot & cold for car washing etc. I plan on tapping into bathroom
plumbing in the basement and run pipes up and through the firewall just
above the foundation wall into the garage. I have easy access to the
basement bathroom plumbing in an adjacent unfinished utility room. I know
how to solder copper and PVC pipes etc but have never done any drain/vent
plumbing.
The toilet and sink vent are shared in sort of an 'h' configuration. There
is also a shower drain which is probably connected to that venting as well
but I can't see that. The toilet vent would be the easiest and closest for
me. I don't care about finishing the utility room so the pipes can run
outside the wall cavity.

My question is where to splice the drain for the utility sink? Can I
splice anywhere into the basement toilet (2") or bathroom sink vent (1.5")
stack without causing problems?

What measures do I take when passing the plumbing through the garage wall
(firewall)?

Garage can get cold enough to freeze I plan on putting some kind of manual
shutoff/drain valve in the basement, but I would prefer some kind of
automatic (passive) system where the pipes drain back into the house each
time the water faucet is turned off or not in use. Does such a thing
exist? (I know about anti freeze hose bibs but I do not want to use those
if possible).

Do anti siphon valves need to be permanently installed on the plumbing? Or
am I OK just using an external add-on hose bib anti siphon valve attached
to the sink faucet?


You may tap into the vent stacks for vents provided your tap in is above the
drain. You can not in most cases tap into a vent for a drain line. "Wet
vents" are not approved any more. There may be exceptions to that statement
but I am not aware of any.

You can install stop/drain valve that would let you bleed the water from the
lines at the end of each season. Whether or not anti-siphon is required for
a garage utility sink is a local code issue. If you have a hose bib type
connection then yes I believe anti-siphon is required.

Sealing around the pipes with a good layer of drywall mud or tight fitting
metal flashing should meet most codes regarding the firewall part.

Colbyt