I want to cut a 30mm deep channel (about 300mm long) into a 120mm thick concrete slab. Can I do this without compromising the structural integrity of the slab? The slab is elevated, It is in the laundry and is about 50mm from three of the room's walls.

Thanks.

OK. I can say this. 30mm = 1.2 inches. 300mm = about one foot. 120mm = about 5 inches. 50mm = 2 inches.

That's about all I can contribute, but the pro's might find it helpful.

Just wondering why you want to cut a 1" trench one foot long in your slab, just 2" from the wall.

Pipe is not normally embedded in concrete. Bore or drill a hole through the concrete and put the piping under the concrete slab. Will not compromise the slab.

You need to explain this a lot better for anyone to answer you correctly < lmao

There's an existing floor trap about 300mm from where I need the new one to be. I wanted to run a channel to the existing bed from the new one rather than core drill through the slab.

It should be 500mm from the walls, not 50mm.

One area of the existing laundry I wanted to put in a laundry cupboard and tile with a new floor drain. I was going to have floorbards laid over the rest of the laundry (it's being effectively added to the kitchen) and over the existing floor drain. I thought if I can cut a channel to the existing floor drain rather than have a plumber (600-700 dollars I was told) core drill down into my neighbour's garage (permsiions issues) it might save a lot of headaches and money.

It's OK to remove that much slab and put PVC in it. People take out much more than that all the time.

Hello Dezzy,

Please read item 2 of the Terms of servise, which says as follows.

Use the best English you are capable of. "Chat speak", all caps, lack of punctuation, etc. can be annoying, and will frequently result in the post being either unanswered or removed.

John

I don't think you will compromise integrity of slab at that depth and that length. A lot of chiseling but can be done..

I've just gone down and checked the slab thickness and it's actually 190mm or 7.5 inches. Anyone still think I'd be nuts to do it?

Thanks to all constructive input!

I can't imagine how a one foot long narrow cut would be a big problem.

Suggest drilling a series of holes 30 mm deep with a hammer drill and percussion bit, then hammer and chisel.

I don't think anyone thought it was nutty. It's fine.

I don't see why you could not... If it is Post-Tension slab than you have to watch for cables in bedded in concrete. Don't cut them, chip off concrete around them.