En-suite waste

[artgeezer]

I'm intending to install an en suite shower and hand basin. The waste run to soil stack works out at around 6m with a 90 degree bend in the middle. As far as I know 40mm waste is restricted to 3m runs, 50mm to 4m. What on earth is the solution apart from not doing it ???

 

[Bahco]

You can fit an air admittance valve within 150 mm of the basin. This will stop any self siphonage problems.

 

[artgeezer]

Thanks for that. Must forgive me as I'm learning on the job so to speak. Just to clarify, will this valve allow me to run the 6 metre waste pipe to the soil stack ? Is there a maximum lentgh of pipe that can be run across an exterior wall ?

 

[Nige F]

Or a Hep V O waste valve instead of a trap+ air valve Go up to 50mm waste from 32 dropping from basin.......use access Tees @ change of direction and provide access to them