H
hightails
Guys,
I am a reasonably competent DIYer, many years general experience, a bit on plumbing but not a lot. Currently gutting and completely relaying out my upstairs bathroom.
Bath will be 4m from stack, so I will be running waste in 50mm into a new boss on the stack, and teeing in basin half way along the run and using an anti-vac trap or AAV. Solvent weld throughout. Hoping that will be OK.
My problem is with the 40mm shower waste which is next to the stack. I have two options
I am a reasonably competent DIYer, many years general experience, a bit on plumbing but not a lot. Currently gutting and completely relaying out my upstairs bathroom.
Bath will be 4m from stack, so I will be running waste in 50mm into a new boss on the stack, and teeing in basin half way along the run and using an anti-vac trap or AAV. Solvent weld throughout. Hoping that will be OK.
My problem is with the 40mm shower waste which is next to the stack. I have two options
- Run it into an existing 30 year old push-fit boss, which looks in reasonable nick apart from a greasy residue around the old push-fit seal – not sure if this old plumbers grease or an oozing joint. This would give the shower a dedicated access to the stack, but I am concerned about that greasy residue and long term reliability. And I would need to connect push fit pipe to solvent pipe with a compression fitting. All this then buried under floor beneath the shower. For obvious reasons I would prefer a solvent weld solution.
- Second option is to tee it as a third fitting into the new 50mm run (solvent weld). But with the bath furthest from stack and this tee nearest stack will I be risking siphoning of the shower seal? There’s nowhere obvious to fit an AAV. Would it help if I minimise the fall past the tee (18mm/m)? Or use 50mm as far up the shower line as possible?