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 ???
En-suite waste
- Thread starter artgeezer
- Start date
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You can fit an air admittance valve within 150 mm of the basin. This will stop any self siphonage problems. 
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 ?
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