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Author:
poissonn (Non-US)
Hello All,
I've asked a local plumber to give me some advices on how to relocate the components of my bathroom on the first floor of my single story house (bathtub, toilet) as well as the main stack in a wall. I felt I needed to check with other people to make sure everything's all right before I start putting everything together. That's what we came up with:
The main drain used to go from the basement all the way to the roof in straight line. Now, as you can see, I have about a 4 feet offset to get it inside the wall on the left of the picture. The piping runs either parrallel with the 2x8 floor joists or underneath. Anything wrong with this diagram?
Thanks a bunch.
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Author:
packy (MA)
i would run the tub into the end of the 'y' and roll up the side of the 'y' with a street 45 in it to accept the lav.
i don't see any cleanouts..
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Author:
poissonn (Non-US)
Good idea about the tub and lav, haven't thought of that. Do I need more than one cleanout? Where would be the best spot? I did not put one as there was none currently with the old piping routing.
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Author:
North Carolina Plumber (NC)
That 4 X 3 spigot bend needs to enter the vertical pipe with a tee, not a wye and 45. I see it's labeled both ways.
Personally I'd leave the tub wye and lavatory drain as is, although it'll work fine and pass inspection either way.
I'd use a 2" cleanout tee just below the tee for the sink drain.
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Author:
poissonn (Non-US)
Yeah, wasn't sure about how to enter the 3" vertical pipe with the water closet, I'll use the san-tee as per your recommendation! I added the 2" cleanout also. Is there a minimum length I need to have between the san-tee of the spigot bend and the elbow underneath that offsets the drain?
As for the lav and bathtub junction, if both are good, I'll see what fits best in the ceiling. Again, thanks a lot for your answers, they are very valuable
Edited 1 times.
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Author:
packy (MA)
my code says a cleanout is needed at the base of every stack.
so, where the toilet goes into what you have marked as a s-tee and down lower where it says 3 inch main drain to basement would be considered 'base of a stack'..
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Author:
poissonn (Non-US)
Good to know, i'd have to check in the canadian's code what are the requirements, but I guess I'll install some...better safe than sorry!
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Author:
packy (MA)
as far as i am concerned... you can never have enough cleanouts or enough shutoffs.
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Author:
exapprentice30 (MA)
You may want to consider increasing the vent to 4" in the attic below the roof to prevent frost closure if you have very cold winters.
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Author:
poissonn (Non-US)
I will! Actually I think the part going outside in the roof is already a 4in stack,
Is there a minimum distance i need to keep between the san-tee of the 4x3 spigot bend and the 90 elbow below that is going horizontal?
I swear I read something about that somewhere but I can't find it anymore...
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Author:
exapprentice30 (MA)
I'm not sure what your code says. I have seen several smaller vents frost over from the moist air in the pipe. In my state on 3" horizontal pipe not exceeding 1/4 inch per foot pitch the vent can be 8ft from trap to the vent and 10ft on 4inch.
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Author:
sum (FL)
not a plumber just a DIYer.
Quote
The piping runs either parallel with the 2x8 floor joists or underneath.
Does it mean if you run it underneath, you have more freedom with the layout of the pipes? Seems if you run it underneath it will be more excavating but you avoid some elbows. For example the 3" toilet line can run at whatever angle it needs to go directly into a sanitary tee, and not through a long sweep 90, and you probably avoid having to drill big holes in your floor joists...2X8 is only 7.25" deep, and a 3" pipe OD is 3.5", thats taking out half of it.
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Author:
poissonn (Non-US)
Actually, I can only run underneath in the bathtub area. Where there is the pipe from the spigot bend to the wall, I run parrallel with the floor joists, than I make a turn and run behind the wall in the basement, that's why I need those bend. Wish I could do it some other way, but I prefer to keep headroom downstairs and not make swisscheese out of my joists!
Edited 1 times.
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