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?

Thanks

Kevin

Kevin Ricks wrote:
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?

Thanks

Kevin


I think you are in way too deep.
First, you can't dump the sink drain into
any vent. It should go into the main waste stack,
but exactly where would depend on the layout of
other fixtures. Too many unknowns.

Why not dispense with the sink and just have
Hot/Cold frost-free sill cocks protruding from the wall.

Jim

"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

http://www.free-ed.net/sweethaven/Bl...p?iNum=fra0309

"Colbyt" wrote in message
m...

"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.

Would it be OK to put in a 'cross T' at the basement sink so that the drains
and vent are shared but no waste water is actually passing through a vent?
This would be sorta like the 1st diagram given in the next reply by
buffalobill. The difference being that the 2 sinks would end up on
different floor levels. The drains would be connected at the same place
about a foot above the basement slab.
For the new utility sink I would either put in a 'cheater vent' or run a
vent pipe up into the attic and connect to an existing vent.
If that is all OK how do I protect the 'P' trap from freezing and/or drying
out when not in use? Do I put a 2nd trap with vent at the basement
connection as well?

Thanks
Kevin




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