I'm putting two bathrooms back to back, with the waste running through the stud wall between the two. In to the 50mm waste I'll have a shower, and three basins drains (one basin is a double) - as pictured.
Would you recommend an air admittance valve be put in the wall near the shower end to prevent siphoning? Using three waterless traps on the basins would add up quite a bit. Any other recommendations prior to getting BC sign off?
Rodding access will be put on the elbow where it comes out of the external wall before it goes in the stack which would allow access along the full horizontal of the waste branch.
Would you recommend an air admittance valve be put in the wall near the shower end to prevent siphoning? Using three waterless traps on the basins would add up quite a bit. Any other recommendations prior to getting BC sign off?
Rodding access will be put on the elbow where it comes out of the external wall before it goes in the stack which would allow access along the full horizontal of the waste branch.
