"Plumbers Box"

jelly

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

Ron The Plumber

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

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jelly

Is this the idea?

Ron The Plumber

Thats it.

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jelly

Thanks Ron!

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



CHEERS

Ron The Plumber

I leave that up to the builder to decide.

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amakarevic

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.