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henderjohn 08-05-2012 04:00 PM

cutting a floor joist
I am installing a new walk-in shower, and the drain falls partially on a floor joist (2X10). I could remove a section of the joist to allow for the drain and trap, and sister a 2X10 in, or cut the section out and box the hole, running 2X10 s perpendicular to the cut joist to the adjacent joists. I'm wondering if both would be acceptable, but I'm leaning towards the boxing in. Code violation??
Thanks :)

mae-ling 08-05-2012 04:56 PM

Would an offset shower drain work?

May need to slightly notch/shave top of floor joist.
Sister another one in beside if you have to notch existing.

GBrackins 08-05-2012 08:38 PM

if you take out one, install two before (one of each side of the opening with maximum of 16" on centers between them. Mae-ling's suggestion may be the way to go!

joecaption 08-05-2012 08:51 PM

The one in the picture looks more like a toilet offset.

tony.g 08-06-2012 02:34 AM

Most Codes allow you to notch the joist, up to about 1/4 the depth,but only near the end of the joist (where the bending stress will be least).

For example, if your joists are 2x10 and you cut a short notch 2" deep near the end, you will be fine. If you cut a similar notch near the centre of the span, you will be converting it to a 2x8, and you will not be fine.

If you put pieces perpendicular to the joists, that will not add any meaningful strength to the notched joist.

mae-ling 08-06-2012 09:59 AM


Originally Posted by joecaption (Post 982385)
The one in the picture looks more like a toilet offset.

I does, but it is for a shower.

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