Cutting a Slab for a Run of Pipe

in general you'll repour concrete to fill in the pipe run. If it's a standard 1 story residential slab then you shouldn't have a problem. Of course, the ulitmate aribrator is your local building department; I'd go ask them when you get your permit. You'd also better beware of any other (water, sewer, etc) pipes in the slab.

If it's in case that the slab you're going to cut, it's roof slab then you must be aware of the decay of reinforcing bar of concrete after cutting of 50mm depth (Because of your concrete slab 100mm thickness) regardless of re-concreting and waterproofing after then Hope it will help Tommy Vietnam

I generally agree with the first response. I would be cautious if the slab spans any opening such as a crawl space or basement. I would reveiw what the slab may be supporting other than occupancy items. However, if the slab is not spanning any open space you are probably okay. But always get the local building inspector buy-in. Showing him two opinions from an engineering bulletin board isn't going to protect your backside.