Drilling holes in floor joists for plumbing
Drilling holes in floor joists for plumbing
(OP)
To get the right flow there’s no way around it we have to drill through the floor joists for our 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 inche 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 think). I don’t know.
I can attach pictures later if needed.
I can attach pictures later if needed.
RE: Drilling holes in floor joists for plumbing
RE: Drilling holes in floor joists for plumbing
Is there any way we can divert the pipe to miss the joists?
The reverse statement of yours is just as absurd.
So adding steel framing between the wood joists that has web openings might be an option although a 6" deep framing seems very shallow and might prohibit what you need to do.
Additional support beams below these joists might be an option - but you risk losing head room clearance below.
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RE: Drilling holes in floor joists for plumbing
Extend the steel plate at least 2x the depth of the joist on each side of the hole. You will need to calculate the plate thickness & length, bolt diameter and pattern, etc.
Works great...…(paint the plates on the joists nearest to the toilet, if/when the toilet links the paint will help protect the plates from rusting)
RE: Drilling holes in floor joists for plumbing
Mike McCann, PE, SE (WA)
RE: Drilling holes in floor joists for plumbing
RE: Drilling holes in floor joists for plumbing
RE: Drilling holes in floor joists for plumbing
Mike McCann, PE, SE (WA)
RE: Drilling holes in floor joists for plumbing
RE: Drilling holes in floor joists for plumbing
RE: Drilling holes in floor joists for plumbing
RE: Drilling holes in floor joists for plumbing
I agree with this but I would add that I do not expect "2x the depth" will be nearly long enough.
Of course, I haven't calculated it for this case. ("...need to calculate..." being the key phrase).
As others have suggested, I don't think there will be enough room above and below the hole for steel angles above and below.
"horizontal chase" (aka soffit) seems like a good idea if possible.