I've got a two-car garage (4-inch concrete slab on grade) that I'm turning into living space. I want to put a bathroom out there but I need to get plumbing through the floor. I didn't think it was possible. I had a contractor come over and take a look. He said no problem. We could just cut a 6-inch trench in the concrete halfway-across the garage. This did not sound like a good idea to me. Is this generally a safe thing to do while keeping the integrity of the slab intact?
The garage is on a slab, but the rest of the home is on a crawlspace. So we'd just need to cut the trench from the middle of the garage to the wall of the crawlspace to tie it in with the plumbing.
Best Answer
This is done all the time in slab-on-grade houses. The slab is there to give you a nice surface to park on, but is not required for the structural integrity of the garage.
So, sure, go right ahead.