new plumbing drops
Remodeling home and building out over garage. I would like to put in bathroom with tub in new space. I can install drains that have nine foot drop before they take 90 degree turn into basement to conect to main stack. My question is once the drain line enters the basement the run is 12 feet and there is only the joist space (2x10) before it crosses over foundation wall to main stack. Would the inability to pitch the line in the basement be compensated by big drop in garage? I can move bathroom over to wet wall in existing part of the house but it would be easier to construct new.
No. You need a pitch or slope of 1/4" per foot for proper drainage. It's simple math. Measure from the highest point (in your case the bottom of the joist) from where the new line will tie into the old. You said the run is 12'x .25= a pitch of 3 inches. If you can't get the 3" try notching a joist out from the bottom to get more height. You can alway's offset the drain line as it leaves the top of the foundation wall as long as it's lower. Good Luck, plumber Tom, Moderator www.bobvila.com/BBs/plumbing
generally speaking what would be percentage increase in cost of job to run water and drainage to two locations twenty feet apart or have it serviced of of one wet wall? I don't need specific cost just a rough idea. (tub, toliet, sink) or share wet wall with same.