I want to add a new toilet to the laundry room in our garage which is located on a concrete slab. The plumbing is already installed for a laundry sink and a washer. This will require adding a 3 inch pvc drain for a toilet that will have to be installed through the concrete slab which will be inches away from an exterior wall. How should I go about breaking up the slab to install the new 3 inch drain and how will I tie it in to the existing waster system?

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Originally Posted by blessedhop

I want to add a new toilet to the the laundry room in our garage which is located on a concrete slab. The plumbing is already installed for a laundry sink and a washer. This will require adding a 3 inch pvc drain for a toilet that will have to be installed through the concrete slab which will be inches away from an exterior wall. How should I go about breaking up the slab to install the new 3 inch drain and how will I tie it in to the existing waster system?

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You will have to break up the slab over to the house sewer main and cut in a wye or combination wye and eighth bend. You may then run over to a closet bend installed 12' to center off the stud plate or 11 1/2" off a finished wall.
Good luck, Tom