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www.homebuildi... Visit our website to learn more about plumbing, bathrooms and home remodeling. Here's another big problem home remodeler's deal with when add a new bathroom to a second story house or homes with more than two floors. If you can't drill through the floor joist or get enough slope to install drain pipes in floor framing, then maybe you can dig a trench in the ground and go around the perimeter of the building foundation with new pipes connecting to drain pipes in back, side or front yard to solve your problem.