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The fall is quite steep somewhere - we've got a manhole in the garden about 10ft from the house and by that point it's about 8ft underground.
I think it's quite gentle between the downstairs toilet and where the waste pipe meets the soil pipe from upstairs under the patio close to the back wall.
Could the gentleness of the pipe be the issue affecting the poor flush?
If so, surely it couldn't be a big enough issue to cause a major blockage after just weeks of use?
(The downstairs toilet has only been installed and functional for the last few weeks)
tbc-
Too steep a fall can also cause issues. Basically the water outruns the shit causing blockages, it would take longer to become apparent though
If this is happening after a few weeks then something is very wrong. Again, have you told your builder why you are withholding payment from him? It sounds like whoever installed the drain has messed up somewhere (I'd assume your builder either did it himself or organised someone else to do it), there are other things that could be causing this but all will be as a result of poor fitting, as I see it your two best options are:
- Talk to your builder and explain the situation, see if he will put it right.
- Get a CCTV survey carried out to find the cause (not cheap and will need to be paid upfront) and pay to get it put right. You may be able to with hold the cost of this from your final payment to the builder but may have to justify it in court.
- Talk to your builder and explain the situation, see if he will put it right.
Bobbo
The waste pipe should be installed to have a gentle fall so that once the waste clears the u bend gravity carries it into the sewer. From what you have described I'd say it sounds like a drains problem and there isn't a big enough fall leading to blockages
Who did you use to get the blockage cleared, did they offer a guarantee on their work? If so have you contacted them?
Have you explained to your builder why you are withholding payment?