What is the minimum amount of space below that's required for a toilet? I understand the drop needs: 1/4 " per foot. Without going into the really long details:
I have a toilet on a basement slab that is 4 ft from the base of the main cast iron 4" stack.
I measured to the bottom of the stack before it turns toward the street and the bottom of the pipe appears to be 15" from the top of the floor(bare slab). I got this measurement by dropping a tape measure from the roof (it's a straight shot down the stack) and looking into the cleanout at the base of the stack. I also inserted the tape measure into the cleanout and bent it so it was going straight down and got 18", but probably the other measurement is more accurate.
My understanding is the allowance is about 6" for fittings, and then 1 inch for the 4 foot run, so this should be possible. Does that sound right?
Second question: if I'm able to tie in right at the base of the stack, and that arm is 4 ft, am I basically stack vented and no additional toilet vent is required?
The back story here is long - but basically converting basement plumbing that is going to a septic tank over to sewer - the sewer was put in 50 years ago but they didn't bother to attach the basement plumbing to it.
Thanks. Have drawings if needed.
I have a toilet on a basement slab that is 4 ft from the base of the main cast iron 4" stack.
I measured to the bottom of the stack before it turns toward the street and the bottom of the pipe appears to be 15" from the top of the floor(bare slab). I got this measurement by dropping a tape measure from the roof (it's a straight shot down the stack) and looking into the cleanout at the base of the stack. I also inserted the tape measure into the cleanout and bent it so it was going straight down and got 18", but probably the other measurement is more accurate.
My understanding is the allowance is about 6" for fittings, and then 1 inch for the 4 foot run, so this should be possible. Does that sound right?
Second question: if I'm able to tie in right at the base of the stack, and that arm is 4 ft, am I basically stack vented and no additional toilet vent is required?
The back story here is long - but basically converting basement plumbing that is going to a septic tank over to sewer - the sewer was put in 50 years ago but they didn't bother to attach the basement plumbing to it.
Thanks. Have drawings if needed.