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Author:
ymazur (CA)
Hello --
I am facing the need to redo the drainage for my toilet that was moved by the previous owner from one wall of the same bathroom to another. The drainage was done incorrectly, and now I have to correct it. I've never done drainage plumbing before, though I am quite handy what it comes to analysis and execution of a home improvement project. So these are my specifics:
1) The distance from center of the toilet flange to the exterior wall/sanitary tee is about 7.5 feet
2) The size of the sanitary tee and the stack (which is right outside of the exterior wall) is 4in
3) The thickness of the joists supporting the floor of the bathroom is 8in
4) Access to the closet bend and the sloping pipe is easy, because it is in the ceiling of the garage
My dilemma is in the fact that the thickness of the joist is only 8in. Per my understanding, if the length of the drain pipe is more than 6 feet, I have to use the 4in pipes. After looking into available 4in elbows/bends, I realize that they are so big that neither 1/4, nor 1/8 slope is possible without the pipe sticking below the 8in beam, which I cannot allow, as it will be under the risk of getting hit by a car.
Are there any 4in closet bends out there that are super-small in size that will not eat so much space under the toilet flange, and will give me enough wiggle room for 1/4in drop?
Any other ideas are appreciated.
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Author:
North Carolina Plumber (NC)
Codes vary, but here in NC 3" pipe with 1/8" fall per foot would be fine. I usually use a st.90 out of the toilet flange to keep up in the joist.
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Author:
hj (AZ)
A "True" closet bend is basically a square 90 degree corner that you cut the riser at the floor level. THere is nothing that COULD be any smaller than that.
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Author:
Paul48 (CT)
You should be able to make 4" work. You have the thickness of the floor,that will account for some of the vertical part of the bend. You have an 8" space, 4.5" OD pipe. That leaves you 3.5" of working room. You need 2" for 1/4" per foot.
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