I am having an extension to sort out some layout issues caused by the
previous 2 extensions done before I bought the house. This involves
moving some bathrooms and the downstairs toilet and therefore am
considering my options for rerouting the underground drains.
Looking at the building regs plans from the latest extension (dated
1988), the main drain run is from the back left, under the house to a
man hole in the hallway in the middle of the right extension. Then
from this man hole through the garage and out to the street ( this run
is from back to front of the house).
Looking under the various manholes along the route, the drains do
appear to run this way however, the manhole in the hallway doesn't
exist (would have been very odd if it had!!) but there is one about 1m
further along the pipe from where it should be to the main sewer in
the street. The only conclusion I can make is that the builders who
built the extension burried a 90 degree turn in the pipe under the
concrete floor so that the manhole is in the garage rather than on the
Based on this, I have a couple of questions.....
1. is this normal / allowable under regs?
I need to add a couple of soil stacks to the drains for a couple of
2. Can I have these either inside or outside the house
3. Do they have to be open to the air - my exisiting ones are but
obviously if I could have it inside, I wouldn't want this.
4. Can I plumb the toilet waste directly into the underground soil
without any form of "stack"? The exisiting toilets appear to be like
this but I thought you couldn't do that...
All help gratefully appreciated.
thanks in advance
- posted 12 years ago