So-called upflushing toilets sit entirely above the floor and include a pump that sends wastewater to a higher access point in the main sewer line. If any concrete construction is out of the question, there are toilets and pump systems that send wastewater straight up. This allows you to avoid tearing up the concrete floor, but it will leave your basement toilet elevated on a slab-a setup most homeowners dislike. One solution is to build up the basement floor, creating a false floor within which the new drainpipe will run. If there’s not enough room for a new drainpipe beneath the concrete floor, or if the main sewer line is actually above the floor in the first place, homeowners hoping to install a basement bathroom have other options. The new pipe must be installed with a downward slope of one-quarter inch per foot, which should be easy as long as the main sewer line connection is far enough below the floor. To install a basement drainpipe that will service a toilet, sink, and shower, the concrete floor surrounding the main sewer line must be broken up and removed so a trench can be dug. While gravity sends water from upstairs drainpipes plunging quickly down to the main sewer line, basement drainpipes are on the same level as the main sewer line and therefore must be properly graded to encourage flow. When installing plumbing fixtures in the lowest point in the house-particularly when installing basement bathrooms-make sure to account for the following factors: Gravity: The Foundation of Good Drainage The continued importance of gravity to plumbing means that elevation is crucially important. We may use electric pumps to send water up to water towers, but oftentimes, the water then proceeds to our homes simply under the power of gravity. Modern residential plumbing works surprisingly like ancient plumbing.
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