S
Shevek
Does anyone know the calculations behind the limit on reducing a stack ventilation pipe to 75 mm and to one and two storey buildings?
We have an en suite to our 2nd floor loft conversion and I want to reduce the soil vent pipe down to 75 mm and run it to and out through the centre of the flat roof.
Problem is I can't do this according to Approved Doc Part H1 1.32:
They need a cut off point somewhere, but is there any BS or something I use to argue that a 75 mm reduction at 3rd floor will be fine in our situation?
We have an en suite to our 2nd floor loft conversion and I want to reduce the soil vent pipe down to 75 mm and run it to and out through the centre of the flat roof.
Problem is I can't do this according to Approved Doc Part H1 1.32:
Sizes of stack ventilation pipes – stack ventilation pipes (the dry part above the highest branch) may be reduced in size in one and two storey houses, but should be not less than 75mm.
They need a cut off point somewhere, but is there any BS or something I use to argue that a 75 mm reduction at 3rd floor will be fine in our situation?