The 4" vertical soil pipe in my ensuite terminates with an air admittance valve below the toilet cistern. I'd like to extend the soil pipe into the loft space and either finish in the loft with an air admittance valve or possibly vent externally.
Can I extend it using a flexible pipe or does it has to be PVC? I need to navigate round the cistern slightly and other obsticles.
Thanks
Can I extend it using a flexible pipe or does it has to be PVC? I need to navigate round the cistern slightly and other obsticles.
Thanks