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Author:
jfjr (CO)
Link to drawing:
[drive.google.com]
The short version of all of this is:
. What are my connection options to fit two branches at the CI, such that the height is less than 8 3/4"?
.. A double sweep fits fine. A double wye with 1/8 bend is too tall by 2 1/4'.
. What are the options to connect 4 feeder lines (2 shower, 2 lavs) to a main branch of of the CI?
. Is it necessary to use 3" pipe or 3x3x3, 3x3x2 to feed said 4 lines?
. Where is the connection made at the main branch? Is it < 20 or just before the toilet at the end of the run?
. What is the best practice for a wye? Should it be 45 (rolled) or just sloped?
Refer to the diagram (link is above)
Long version follows:
I am doing a 2nd 3/4 bath (group A). It adjoins existing 3/4 bath. I need to branch to two closets from the CI. The stack vent is outside the house another 12". The branches run perpendicular. Using x,y coordinates with CI at 0,0, the first branch is a distance of -5',0 from the CI (that is 5' to straight West) and the other branch is -40" at 0,40" (that is 40" to the South). Drain to S-Tee distance is 30". Wye is at wall.
These branches are 3" PVC and the first feeds the adjoining toilet and one of two new shower drains. The shower drains halfway between this line. I would like to dry vent the shower, so I would like to run away from the CI toward the toilet and at the wall make connections (vent, S-Tee, clean-out using 2" for the horizontal and a Wye to return to the CI. The S-Tee and the Wye (street 90 elbow) will butt to keep rise at the minimum. Therefore, the shower drain is a separate line but feeds into this branch.
The 2nd main branch at 0,40" is for the toilet and a wye for a clean-out and a wye for an auxiliary 2" branch from it for the existing shower and lavatory from the other group and a shower and lavatory drain from this new group (group A) these can meet horizontally with 45 elbows and a 22 elbow.
In addition a 2nd shower drain (only one new shower) and a lavatory need to drain in-line as the auxiliary branch as in the preceding paragraph. This shower drain line and lavatory are to dry vented as in the preceding. This will cross-vent at 7' to the 2" vent. Drain to S-Tee is 30". Wye is at wall.
The shower drain, 2 of 2, drains halfway between this line. I would like to dry vent the shower, so I would like to run away from the CI toward the wall and at the wall make connections (vent, S-Tee, clean-out using 2" for the horizontal and a street 90 or Wye to return to the CI, minimum rise as in the 1st of 2nd drains. This will cross-vent at 7'
I have vertical 14.5 inches from the main hub (CI) to the top of the slab. What are the choices for a vertical connection? What are the choices for a horizontal connection?
I need 5 3/4 inches to clear the slab, so the vertical height of the connection needs to be < 8 3/4 high. A double sweep 90 works perfectly, however, I am not sure it is the best route. A wye with 1/8 bend stands at 11 inches and is too tall.
I am not sure of my choices for a horizontal connection at the CI. Can a Double Wye Combo be fitted for this orientation?
Also, I am wondering if a third 3" branch is more appropriate for handling the 4 feeds (2 lavs, and 2 shower drains). I have read that the code is to place this auxiliary feed at less than 10 times the diameter of the feeder (< 20) to the main branch.
Where is the best place to feed these 4 lines to one of two main toilet branches?
My locale uses 2015 Internatioinal Plumbing Code Published by the International Code Council.
The short version of all of this is:
. What are my connection options to fit two branches at the CI, such that the height is less than 8 3/4"?
. What are the options to connect 4 feeder lines (2 shower, 2 lavs) to a main branch of of the CI?
. Is it necessary to use 3" pipe or 3x3x3, 3x3x2 to feed said 4 lines?
. Where is the connection made at the main branch? Is it < 20 or just before the toilet?
. What is the best practice for a wye? Should it be 45 (rolled) or just sloped?
Edited 3 times.
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Author:
hj (AZ)
Your description makes sense to you, but I get completely lost when I try to follow it. A diagram MIGHT help.
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Author:
jfjr (CO)
Thanks for the looks/see.
A diagram link has been posted at the top.
Edited 1 times.
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