Hi. First off, I'm a homeowner so forgive me if this sounds crazy. I have a 2 story house and want to install a new bathroom on the second floor. I would like to do this without disturbing the 1st floor ceiling and was thinking that I could raise the floor where the new bathroom will go so that the pipes can be installed under it. I realize it is not typical but can it be done? The finished bathroom would be in the master bedroom but would require a step up to get into it. (There is enough height to accommodate this.) The toilet would sit close to the main stack in the house. The sink would be about 4' away and the shower about 8' away from the central stack. As long as there's enough height to pitch the pipes properly, this should work, shouldn't it? I've been told 1/8" for every foot is the rule of thumb.