Re: Do I have to move the drain?
There will be 3 considerations for relocating the sink :
Once you've determined how to run the vent then the drain becomes more tricky depending how the floor joists are running.
- the vent
- the drain
- water supplies
Personally I wouldn't run the drain pipe "through" the floor joists since this would involve notching and drilling holes in the joists .... there are rules and common sense that govern this without compromising the structure and the need for re-enforcement.
You need to have at least a 1/4 inch slope for every foot of run which would be a 2 inch difference in an 8 foot run .
Drilling and notching of standard wood members is subject to the following:
- Notches in joists, rafters, and beams may not exceed one-sixth of the depth of the member, may not be longer than one-third of the depth of the member and may not be located in the middle third of the span.
- Notches at the ends of a joist, rafter, or beam may not exceed one-fourth the depth of the member.
If there are other items run through the joists already ... wires , water pipes .... this will restrict any more holes and notches.
- The diameter of holes bored or cut into joists, rafters, and beams may not exceed one-third the actual depth of the member. Holes may not be closer than 2 inches to the top or bottom of the member or any other hole located in the member. Where the member is also notched, the hole may be no closer than 2 inches to the notch.
The new location may have the opportunity to run the pipe in the space between joists .... running parallel.
If they will run perpendicular ... you should consider running them below the joists.
This would depend on what's below the kitchen floor and accessibility.
Hope this helps.
"" an ounce of perception -- a pound of obscure "