: Any suggestions on best ways to tap into a drain in a basement to install a toilet and shower? Any way to "see" what is under there before opening the concrete? (I'm thinking of the little testers for electric wires so we know where they are before opening up a wall - is there something similar for drain pipes so we know where they go under the concrete? I can back the toilet up to the drainpipe from the upstairs toilet, but obviously will have to put the shower a few feet away and get that water to the same drainline. I'm in a 1920s Seattle house and scared of what I may find when I bust into that concrete!
Physically demanding but I do it regularly. Here's how I do it. Find your point of entry into main stack/drain in basement. Layout new drains. I don't know what you might find on a house this old but I then use my skillsaw with concrete blade to cut a channel in the floor. Really noisy, messy, lots of dust. Modern slabs are about 3 to 4 inches thick. Then break out the concrete, rebar and dig out to accomodate your new drain pipe and traps with the proper slope to the main stack. Or you can look into pump-up systems which require no digging. Just use a search engine to get info.