atnash
New Member
Hi All. Going to DIY renovate a garage and laundry room and this will be my first major plumbing undertaking. I'm in California (2021 UPC based code). I'm looking for feedback on this proposed drain and vent scheme. There is a true rats nest of stuff going on in this area (gas dryer combustion air and exhaust, gas water heater air and exhaust, supply water lines for water heater and fixtures in this immediate region). I've accounted for all of this in the scheme, which is the source of a lot of the seeming excessive complexity.
Beyond comments on the scheme, I've got a few other related questions:
Beyond comments on the scheme, I've got a few other related questions:
- Any issues with joining all of the vents into one before going through the roof? Looking to minimize roof penetrations. I'd try to go through the wall, but that's not feasible here. Any need to add cleanouts to the vent branches (access would be available in the attic)?
- Cleanout on the left will be behind a washer/dryer (can be moved if needed). Does that meet code requirements?
- Can I take the tankless gas water heater condensate and air gap it to an exposed trap on the wall, then have that feed into the 3" stack? There's no ground around here to dump it on and I don't want to have it eat up concrete floors.
- Can I have the tankless gas water heater PRV discharge into a metal garage sink via copper pipe? It would then drain through the sink trap shown on the right of the image. Not sure if the sink will buffer the temp down enough or if that will melt the drain pipe. Can discharge to garage floor, but not preferred if possible.
- Permits have already been pulled for this scope. Would you think this portion of DWV piping should be isolated and pressure tested for inspection (then connected to existing drain after passing pressure test)?