I’m trying to size a floor joist system to completely hide a 4″ solid waste line that originates at a toilet and drops across the width of the room at 1/4′ per foot. To be able to calculate the necessary depth of the floor I need to know how far close to the top (or bottom) of the subfloor the bend in the pipe can be. In other words: Generally speaking, how far down from the top of the subfloor is the centerline of the horizontal pipe at the top of its run? Are there special bends for these kind of limited-height circumstances? What is this bend called? Any help is greatly appreciated.
-Mike
Replies
Do you really need a 4" pipe? A three inch will carry a lot of fixture units and you can pitch it at 1/8" per foot.
Yesterday I couldn't even spell plumber, today I are one.
I was just trying to be conservative and have a rule of thumb I might be able to take to another job but I'm sure you're right about the fixture units. This pipe basically serves a lav, reservoir toilet and a shower. So what would it be if this was a 3" pipe?
Heck yes, 3" will do a whole house! The pitch needs to be only 1/8" per foot also as I stated before. I believe, top of floor to bottom of pipe is about 7" at the flange. Probably going to need 2 x 10 joists if you are going any distance. If you have to go through the joists, that's different.
Yesterday I couldn't even spell plumber, today I are one.
Thanks you so much.
If you have to go through the joists, that's different
Man I cringe when I hear the plumbers using a recip saw in the next room over....View ImageGo Jayhawks..............Next Year
I hear your concern. I would NEVER sacrifice a structure. To bad these things are not thought of in the design though. Why do they put "plumbing walls" over triple joists?-)