How Can I Support Joist After I Cut It For Waste Pipe? - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 03-16-2013, 02:16 PM   #1
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How can I support joist after I cut it for waste pipe?

I am trying to add a bathroom to my attic. The only spot to run the pipe is next to the chimney. I have looked at every possible location to run the pipe and the only options I have is this spot or go down the laundry chute. We still use the chute and if we used it to run a waste line through the bathroom in the attic would not be where we want it. Running the pipe next to the chimney will be pretty easy except for in the basement. Where the pipe comes down from is right on top of a joist.

Here is some pictures. I was going to try and do this

But I can't because the chimney is on the other side

What can I do? Thanks in advance


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Old 03-17-2013, 04:54 AM   #2
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Old 03-17-2013, 07:16 AM   #3
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No way would I cut that old joist for that pipe. I would try to offset around it or figure out something else. Looks like a real old place , got to be careful what you cut and what reason.
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Old 03-17-2013, 08:30 AM   #4
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I think you can follow the diagram you posted. Usually you need to double up on the joists to install the headers across, but the area around the chimney rarely supports any weight. Just make sure the full joist away from the chimney is above a dead space, or if you can, sister 2x6 or full width 3/4 plywood, spanning 8' center.
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Old 03-17-2013, 09:09 AM   #5
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Nope no cutting that! Time to use 22 degree or 45's to offset it. don't always have to be a strait line.
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