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I'm going to be doing some cutting of the slab in my basement in order to put a bathroom in. There is plumbing under the slab and a pit with a tank in it, but it is probably 30 feet from where I want the bathroom. I understand I need to saw the floor, but there is roughed in load bearing stud walls in place (see this post for actual pics if necessary).

I need to go through/under these walls, so what do I do when I reach them? Cut the footers?

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  • how deep a trench is needed? how deep is the foundation wall+footing that are under the slab that is under the 2x load bearing wall? – mike Oct 18 '13 at 2:51
  • deep enough for a 3" waste line. These are interior walls. At least a foot away from perimeter walls at all times. – Flotsam N. Jetsam Oct 18 '13 at 6:00
  • If that is a load bearing wall, I bet that directly underneath the wall, under the slab, you will discover a foundation wall with a footer. – mike Oct 22 '13 at 6:58
  • The basement was roughed in by the builder, probably 8 rooms in 2500 square feet. I say they are all load bearing because they have double 2x4 headers, which I understand to be the standard indication of load bearing. If that's true, would they go to all that trouble to do as you describe with the foundation? – Flotsam N. Jetsam Oct 23 '13 at 2:01
  • I am guessing you are talking about double top plates, which is not an indication that it is load bearing ... en.wikipedia.org/wiki/Wall_plate ... and ... thebuildingcodeforum.com/forum/residential-foundation-codes/… ... and ... arcxl.com/architects/detail?type=Spread+Footing+Detail – mike Oct 23 '13 at 5:39
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One option is don't cut under the walls. Cut up to a couple of inches away from the wall and stop. Continue a couple of inches past the other side of the wall. Then you can just dig under the slab "bridge".

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