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Thread: Adding second floor bathroom

  1. #1
    DIY Junior Member Gtomike06's Avatar
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    Default Adding second floor bathroom vent help.

    I'm adding another bathroom on my second floor that was previously a laundry room. When it was a laundry room it only had a drain for the washer, a 2" drain line tying into the plumbing across the hall which is the master bathroom. I am making the former laundry room into a full bath, shower unit, toilet, and sink. As long as I tie into the plumbing for the master bath will I need another vent stack? If I need another vent the hot water heater was gas so it has an exhaust pipe that runs through the roof above this room that is now obsolete, could I run PVC through the exhaust pipe to the roof as a proper vent? Thanks.
    Last edited by Gtomike06; 02-16-2011 at 09:32 PM.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    I think you are taking on a pretty ambitious project for a DIYer. When you apply for your permit, you will need a drawing of the plumbing, and that is when the building department will tell you what your venting needs are.

  3. #3
    DIY Junior Member Gtomike06's Avatar
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    well this wont be my first project. a couple years back me and my dad changed out all the plumbing in my moms house from copper to pvc when they did their remodel but that was pretty easy just taking out what was there and putting in the same thing and i relocated my laundry room by myself and by reading up on the forum, that was easier though because i just knocked a hole in the slab tunneled under, and ran 2 inch pvc with a 1/4" slope all the way to the septic tank and used an AAV for venting. permits?! lol i live in the middle of nowhere i dont think we have those except for maybe new construction out here. I have been reading up on venting and have come up with 2 ideas, if yall can critique it id appreciate it.
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    Test, Don't Guess! cacher_chick's Avatar
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    As drawn, when you flush the toilet it's going to suck the water out of the shower trap.
    The "vent stack" as you have drawn it accomplishes nothing.
    Isn't plumbing fun!

  5. #5
    DIY Junior Member Gtomike06's Avatar
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    What could I change around to prevent that and vent it properly? I'd pay a plumber to do it but man just for the laundry room I moved i got estimates from 1100-1500 just to move a washer, dryer, and hot water heater as long as I dug the trench for the drain. I ended up doing it all myself for $500.
    Last edited by Gtomike06; 02-17-2011 at 06:40 PM.

  6. #6
    DIY Junior Member Gtomike06's Avatar
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    ok i read up quite a bit on proper venting and went back to the drawing board and i think ive got it. tell me what you think.
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    Moderator & Master Plumber hj's Avatar
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    In version #3, the tub trap is too far from its vent connection. Do not even think about installing it like version #2. It appears that each version gets more complicated than the previous one.

  8. #8
    DIY Junior Member Gtomike06's Avatar
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    Ok could I just tee off a vent line from the tub drain where it is right now run it up the wall and tie it to the vent stack in the attic? Or could I just turn the tub around where it won't have that 90 and the drain will be in line with the sink and wc? Thanks for the help so far.

  9. #9
    Test, Don't Guess! cacher_chick's Avatar
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    Quote Originally Posted by Gtomike06 View Post
    Ok could I just tee off a vent line from the tub drain where it is right now run it up the wall and tie it to the vent stack in the attic? Or could I just turn the tub around where it won't have that 90 and the drain will be in line with the sink and wc? Thanks for the help so far.
    You could do either as long as the vent is vertical until it is at least 6" above the flood rim of the sink.

  10. #10
    DIY Junior Member Gtomike06's Avatar
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    ok, hopefully this will be the final one, id really prefer not to flip the shower around since it would be the easiest to make an access panel to shutoff valves on the current end so lets see if this will vent it, the shower is 60 inches wide overall and the drain is about 6 inches from the wall so it will be approx 54 inches away from the vent and ive been reading to try and keep them about 5 foot from a vent so this oughta be pretty close, the pipes will all run inside the wall it was just kinda hard since im not a great artist to make it all look right. alright lets hear it.
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  11. #11
    Moderator & Master Plumber hj's Avatar
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    Depending on the construction of the building, it may still more complicated than it needs to be, but will work.

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    DIY Junior Member Gtomike06's Avatar
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    well working is my main concern, the main vent stack is about +/- 15 ft away from the sink so i didnt think i could tie anything to that one for venting. thanks for the help.

  13. #13
    DIY Junior Member Gtomike06's Avatar
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    ugh..... the problems of remodeing...... i replaced all the subfloor and started putting my water lines in and then was going to start working on the drains when i realized that under the sole plate that i planned on running my drain lines under is 3 2x10 beams sandwiched together so theres no way to run em without cutting the beam up which i dont plan on doing. so im going to move the vanity and WC to the other side of the room. so heres my plan and the diagram i based it off of but in the diagram the vent was on the other side of the room so i had to modify it some, just wanted to make sure this will vent and drain properly. i was going to just run a 2 inch vent stack since this will be all it vents and i read that if its a secondary vent it can be 2 inch. does that sound right?
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