[patrickpresti]

Hi guys,

I have to run a 3" toilet PVC drain pipe through a 2x8 floor joist. I know that the biggest hole you can drill through a 2x8 is 2 3/8" but I have no other option but to go through this joist. Is there any way I can scab the joist?

Thanks,

Pat

 

[Anti-wingnut]

Pluming or carpentry are better forums for this thread.

There are a variety of ways to repair this, some would take an engineers approval

 

[patrickpresti]

Oops. I put this in the wrong forum. Thanks!

 

[Anti-wingnut]

If we had a photo or lay out, there may be other methods or runs which would save the poor joist

 

[TheEplumber]

Moved.
Need more info such as span, # of joists drilled, pipe layout, etc

 

[Colbyt]

The proper way to do it is to add double headers on each side of the pipe to to the 2 adjacent joists. Technically they should probably be doubled bit I seen a lot of them that aren't. Add the framing before you drill the hole and use joist hangers.