I cut out the concrete slab in my detached garage to run plumbing lines, the trench is 1 foot wide. do I need to put rebar in the slab before I pour concrete or can I just pour the concrete?
A wall(non-load bearing) will be placed on top of it.
I cut out the concrete slab in my detached garage to run plumbing lines, the trench is 1 foot wide.
I wouldn't worry about it for a small patch like that, did about the same a few years ago moving a toilet line and haven't had any problems
You'll probably be ok without rebar but I would use it just to be safe. Digging out shitcrete to find and fix a crack is no fun
I think you'd have a hard time finding a place to drill straight into the existing concrete to even put the rebar in a place it can be effective. Maybe some mesh over the pipe though because it doesnt look like the concrete will be very thick above it.
When patching a slab I always excavate a little bit below the existing slab around the perimeter of the hole (like in this pic) as it will help keep the patch from being pushed up by any hydrostatic pressure that may occur in the soil. And if there's room to get a drill in there, put in some rebar pins every few feet to help keep things in line.
Also like this guy said lay some mesh over the pipe since the concrete will be really thin in those spots.
>disclaimer: not an expert
You're probably fine to just pour the concrete. As was pointed out, you're going to have trouble even drilling into the existing slab to add rebar. If you're worried, a decent half measure would be to cut some keying into it.
Put a grate over it because you didn't put the pipe below the concrete. Pouring new over that will be complete ass and break up in no time.
Came here to post this.
I own 2 properties with this situation and it just makes better sense.
you should also strive to bury the pipe deeper, that is going to be hella thin and probably should keep the entire pipe below the bottom of the concrete if at all possible.
>bury the pipe deeper
There's an existing drain line in the slab which he's spliced in to at the circled areas. None of the new plumbing can be lower than that or the drain will not function.
Cut a lip around the hole and cover it with a metal slab then duck tape over it and put a rug there
That doesn't seem like it has enough fall. You don't want any standing water in the pipe.
was there rebar before..
how would rebar help in a patch...
why isn't the pipes below the concrete
>why isn't the pipes below the concrete
Because turds abide by the rules of gravity.
I would:
Make some sort of key on the existing concrete
Seal the exposed edges of the existing concrete with Pva or similar
Fill with glass-fiber reinforced concrete to lessen chance of cracks