Posted: Sun Aug 31, 2003 9:07 pm
I have just discovered a 6" clay sewer - 11" below what will be the finished level of a block paved drive. What should I do to prevent damage to this pipe by type one aggregate or vibrating plate.
Encase it in concrete, with flexcell joints at the couplings. There's a drawing on the Laying Drainage page which illustrates the idea.
Alternatively, you can lay a 450mm wide strip of 50/65mm thick pcc flag over the top of the pipe, ensuring there is at least 50mm of sand cover between the top of the pipe and the base of the concrete flag. This is adequate for a typical residential driveway where there'll not be owt heavier than a 4x4 travelling at low speed.