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Old 03-24-2008, 09:50 PM   #1
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"Plumbers Box"


I have a challange with the new bathroom I put upstairs. Directly below the upstairs toilet is a window below on the first floor. In order to drop down with the 3" sewer line, I will first have to turn 90 degrees cut into a 2x8 floor joist and go down in the next bay. My uncle said that I need to build "plumbers box" in order to support the joist that will have a 3" hole in it. He didn't know exactly how to do it, I googled "plumbers box" but could not find a diagram or information on how to support the joist.

Your thoughts/ideas are appreciated. Thanks and Regards

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Old 03-24-2008, 10:08 PM   #2
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"Plumbers Box"


It's called header out the joist to allow plumbing to fit.

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Old 03-24-2008, 10:16 PM   #3
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"Plumbers Box"


Is this the idea?

Last edited by jelly; 03-24-2008 at 10:20 PM.
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Old 03-24-2008, 10:17 PM   #4
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"Plumbers Box"


Thats it.
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Old 03-24-2008, 10:26 PM   #5
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"Plumbers Box"


Thanks Ron!

Also found this diagram, do you recommend double headers AND double joists?



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Old 03-24-2008, 10:44 PM   #6
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"Plumbers Box"


I leave that up to the builder to decide.
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Old 03-25-2008, 04:07 PM   #7
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"Plumbers Box"


i wonder if this building form is applicable vertically as well as horizontally ?

i would like to build something like this to enable a loop vent where the fixture is two studs away from the drain inlet that goes into the concrete slab.

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