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Drilling holes into floor joists for plumbing ?

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Kmbarnin

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Discussion starter · #1 ·
I’m putting in a half bathroom and I’m having a problem with toilet draining. To get the right flow there’s no way around it we have to drill through the floor joists for the toilet drain pipe. The pipes are 3 inch pvc. We have to drill through 6 or 7 of the joists. The floor joists are a weird 3 inch thick by 6 inches wide. They are roughly 20-22 inches apart and they run 8 ft long to the center giant IBeam that looks like it was meant for a bridge. How can I reinforce these beams or add support so that I can put in the 3 inch holes? There has to be a way but 6 inch wide joists (5.75 inches) does not seem wide enough to accommodate a 3 inch hole. I mean they are 3 inches thick (2.75 actual)

I can attach pictures later if needed.
 
#4 ·
I know where I am there's no way I'm getting a permit to cut that much out of floor joists. With that being said, We did a job where we went through ten inch joists with three inch pipes and we had 1/4 inch steel plates fabbed up with all the holes predrilled for the pipe and bolts that we impacted on either side of the joists. IDK dude, that way too much wood out of a joist. Iirc my local code is no more than a 20 % or something like that.
 
#6 ·
It's a basic code question. Holes have to be a minimum of 2" from the top or bottom of the joist, and no more than 1/3 the depth.

Run it above the joists, below the joists, or get an engineered solution for running it through the joists.
 
#7 ·
There's all kinds of options. You just need to find one.

Welcome to the world of remodeling.

You can run the pipe between the joists, and down a wall. (Usually the best way)

You can hire an engineer and then a fab shop to make some fancy pieces of steel, if you want to go the expensive route.

You can box it in, as was suggested.

You can drop the entire ceiling.

You can elevate the WC and install a tank and sewage ejector, and run it up through the attic.

You can relocate the bathroom.

Lots of options. But drilling those joists ain't one. :thumbsup:
 
#8 ·
You could use one of those janky Saniflo toilets.

Sent from my Pixel 2 using Tapatalk
 
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#12 · (Edited)
Maybe i should start another thread. i happen to see this one on the same subject so thought i would tag along. would appreciate input. This is how i found it and before putting up drywall it obviously needs addressing. was going to do a plumber type box but will not work as i see it but i can move shower drain an inch and with offset should clear but then there is the toilet drain that was also hacked out so within a 1/4 inch in spots. shocking

.
 
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rselectric1
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