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Old 10-22-2013, 09:03 AM   #1
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Install bathtub waste line over floor truss


I am installing a bath tub in a second floor bathroom. The floor is a wooden web truss about 15" deep with 2x4 top and bottom. The waste line needs to be drilled through the top 2x4, if possible because that is where the tub drain lines up. The truss is cantilevered over the lower exterior wall in this area. The drain will sit in the cantilevered area. What do we do to strengthen the truss when we drill the waste pipe hole?

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Old 10-22-2013, 09:09 AM   #2
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Install bathtub waste line over floor truss


You really need a structural engineer to answer this question. Cutting or drilling the cords of a truss compromises the strength greatly.

Better yet, change your floor layout to avoid the truss.

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Old 10-22-2013, 09:17 AM   #3
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Install bathtub waste line over floor truss


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You really need a structural engineer to answer this question. Cutting or drilling the cords of a truss compromises the strength greatly.

Better yet, change your floor layout to avoid the truss.
Unfortunately like most remodel projects the space is limited and the tub needs to fit there. I know with floor joists you can box it for waste lines. I was hoping to add something to the sides to make up for the loss of strength.
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Old 10-22-2013, 09:23 AM   #4
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Install bathtub waste line over floor truss


I think you're in the wrong department. Try the building and construction or carpentry pages they might be able to answer your questions a little better.
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Old 10-22-2013, 09:26 AM   #5
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Install bathtub waste line over floor truss


I would do what ever it takes to avoid ANY alteration of a truss. No matter what.
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Old 10-22-2013, 09:32 AM   #6
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Install bathtub waste line over floor truss


I will try that
Thank you
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Old 10-22-2013, 10:11 AM   #7
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Install bathtub waste line over floor truss


The thread continues here: Installing bath tub over floor truss
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Old 10-22-2013, 02:53 PM   #8
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Install bathtub waste line over floor truss


I checked in with the building section and they confirm that cutting the truss is a bad idea. What about other options?
This is a drop in Jacuzzi tub for which I am building the frame. I could raise the tub on a false floor to allow the drain to turn 90 degrees and go around the truss.
Any other options?
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Old 10-22-2013, 03:36 PM   #9
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Install bathtub waste line over floor truss


Here is a couple different ideas. As soon as you penetrate the floor use a tee.. branch picks up the P trap and top side of tee is for the vent. You can offset the piping coming out of the branch of the tee with long tern 90's or forty fives but do not go over 5 feet.. at least that's what my code reads.

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Old 10-22-2013, 03:39 PM   #10
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Install bathtub waste line over floor truss


Just make sure that the trap is underneath the overflow...not that you're making all sorts of offsets off of the riser of the trap.
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Old 10-22-2013, 05:34 PM   #11
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Install bathtub waste line over floor truss


Just to point this out. Notice where the vent is on the tee. Your trap on the tub cannot go above that point.
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Old 10-22-2013, 05:41 PM   #12
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Install bathtub waste line over floor truss


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Just to point this out. Notice where the vent is on the tee. Your trap on the tub cannot go above that point.
In layman's terms you cannot rise more than the diameter of the pipe..1 1/2" typically
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Old 10-22-2013, 05:41 PM   #13
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In layman's terms you cannot rise more than the diameter of the pipe..1 1/2" typically
From the tee
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Old 10-22-2013, 05:49 PM   #14
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Install bathtub waste line over floor truss


Raise the tub about 3" to get above the floor with the drain shoe.
Point the shoe at an angle so it's outlet misses the joist.
Then on the overflow 90- angle it with a 45 elbow and offset it to line up with the tub drain and install the tee.
The hang your trap in the joist bay.
Nothing says the overflow has to point straight down if you're using a pop up made out of glued up PVC or ABS.

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