I want to do my own DIY bathroom, wanting to know how to go about doing the shower waste through a slab of concrete.

First tell us something about the place where you plan to install new shower: 1. was there any plumbing fixture before ?
2. how far is it from nearest plumbing fixture?
3. do you plan on installing pre-fab shower unit of build it from scratch ?

Please, provide this info so we can help you... Back to you... Milo

Hi Milo
The current room is a bathroom laundry in on but never had a shower, where I am placing the shower it does not have a waste. The laundry waste is about two meteres away from where the shower waste will be. The structure is full brick with a solid concrete floor. I intend to have a framles glass shower screan and water proof the walls and floor before tiling.

There are 2 ways to proceed with such an installation:

1. If you don't mind building your shower on a step than you save yourself some floor / wall cutting. This step would build up floor about 8" high and would conceal shower trap. Then, you would run your drain pipe towards washer waste and connect it with washer waste pipe just above the floor.

2. Cutting Floor: Locate drain for washer. Cut from shower location to washer drain location. Connect. Depending on existing plumbing configuration, this connection could be in the floor or in the wall behind the washer.

Venting: shower should be vented. Some Codes allow so called "Wet Venting", some don't. If the job is permitted than you should phone your Plumbing Inspector and ask him about this detail. Nevertheless, if there are no Inspectors involved than: you are about 6' away from washer drain. You should be OK to wet vent your new shower utilizing washer drain.

Hot and Cold water: you can take h/c water from washer supplies.

Hope that helps... Milo

Excellent advice from Milo,
I prefer #2 cutting the slab.
As for #3 check to see if wet venting's allowed and if it is connect the shower to the lavatory drain, (see image) where it will be wet vented.
BTW! What material are the pipes? Cast iron or plastic? Back to you, Tom