Soil stack vented through roof vent - ducting full of water
Anonymous user 23/02/2024 - 3.44 PM
Hi
I’ve recently moved house and one of the “nice” surprises I’ve found is that the soil stack in an extended part of the house is vented through a roof tile connected by some flexible ducting.
While an electrician was changing the extractor fan he found that the ducting mentioned above was full of water (part of it was sagging like a u-bend.
I’ve no idea if the approach to this is sound and whether the water is the roof vent leaking or years of condensation from the soil stack accumulating in the ducting. No idea if I should call a plumber, a roofer, both, or someone else 😩
Any ideas please? Thank you.
Are you a tradesperson and able to answer this question?
The flexible ducting pipe should be removed, and replaced with 110mm soil pipe. If you have room to move the pipe you could use 2 x pipe connections. If unable to move pipe use 2 x slip collars that tighten with jubilee clips.
Hi. The soil stack should be a solid plastic pipe. If there is flexible ducting connecting it to something there should not be any U-bend in the flexible ducting. This occurs (and I am assuming that the flexible ducting is the same light weight stuff used for air extraction) as the ducting is not designed to carry water, just allow the movement of air. If the ducting is laid in such as manner that allows a drop then water will collect in that area due to condensation etc. I would reposition the ducting to remove the chances it sagging to allow water to collect.
Sounds to me that it is not anything to do with a waste pipe , if the electrician was changing the extract fan then its just the extract ducting , in some houses they go from flexi hose to a 4 inch pipe to vent out of a roof tile or through the facia board , sounds like to me that a faulty vent or incorrect vent cover used for the exterior . If vented straight up out the roof the pipe should have a cover over it like a hat so air can be pushed out but no water can come in or side exit it should have a vent with slanted or flapping grills.
Don't think it's as bad as it seems and an electrician should be able to resolve but if they are jot confident in getting high as the roof a roofer could also do it . :)
Hope this helps
