To cut the slab, I use an old worm-drive saw fitted with a $40 dry-cut diamond blade it must be plugged into a GFCI-protected outlet. wide to leave extra working room for fittings. dia., but the trenches need to be wide enough to be shoveled out. The templates register to the adjacent wall plates or wall layout lines, so after the slab is removed and the trench is dug, Paul has a guide for installing the drains. A saw and a sledgehammer open the floorīefore I start breaking up the concrete slab, I make cardboard templates of the drain-riser positions for the shower and the toilet. Other plumbed fixtures, such as a washing machine, a utility sink, a kitchen sink, and a dishwasher, can be tied in to the same drain system. The bathroom in this project is typical and includes a toilet, a pedestal sink, and a one-piece shower stall. He also identifies suitable locations for the sewage-ejector tank and draws the final trench layout. We review options, and he recommends layout changes that minimize my work and simplify his drain- and vent-pipe arrangement. I chalk a proposed fixture layout on the concrete slab, then meet with Paul. This saves me from having to move lots of broken concrete and then repour the slab. Rather than completely breaking out the concrete slab in the prospective bathroom, I cut trenches where the drains will run. The roughin process takes several days for us to complete then we can schedule the inspections. Of course, the sewer-outlet pipe on most of my projects is above the basement-floor elevation, so we have to install a tank to collect the sewage and a pump to send it up to the level of the sewer outlet. I tackle the slab work, and he lays the drain and supply piping. I work with my plumber, Paul Murray, to map out the best fixture layout, and we then divide the tasks required to complete the project. Cutting the slab and digging the trench for the waste lines are the tasks that set this project apart. It’s simple and straightforward to bring in the small-diameter supply lines for hot and cold water. It’s also important to tie in vent lines for the basement fixtures.Īdding a bathroom in a basement might sound like a complicated project, but the plumbing part of the job isn’t much different than any above-grade bath. This crucial step ensures that plumbing is located so that wastewater flows downhill to a tank from there, it is pumped to the main waste line and out of the house. Rhode Island contractor and Fine Homebuilding contributing editor Mike Guertin outlines his strategy for adding a basement bath, starting with planning the drain layout. Synopsis: Adding a basement bathroom is just like adding a bath anywhere else in the house - except for cutting through the basement’s concrete-slab floor.
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