Hello,
I'm in the process of replacign all of the old clay foul and surface water drains at the rear of our house with new plastic pipes for our new rear extension. As we are head of the run, the drain pipes are quite high and close the the ground surface. As a result they will be intersecting the foundations quite high up. My question is:
Can I shutter the trench from top to bottom and essentially pour the concrete on either side, filling the hole with pea shingle and using lintels over the top OR is there a maximum depth of pea shingle allowed below the pipe and do I have to carry the concrete up to a certain depth below the drain pipe to bridge the two side?
If I don't need to bridge the concrete below the pipes, I suppose I could leave a step in the existing ground below the drain pipe up to 100mm below the pipe and fill that with pea shingle?
Any advice will be much appreciated.
I'm in the process of replacign all of the old clay foul and surface water drains at the rear of our house with new plastic pipes for our new rear extension. As we are head of the run, the drain pipes are quite high and close the the ground surface. As a result they will be intersecting the foundations quite high up. My question is:
Can I shutter the trench from top to bottom and essentially pour the concrete on either side, filling the hole with pea shingle and using lintels over the top OR is there a maximum depth of pea shingle allowed below the pipe and do I have to carry the concrete up to a certain depth below the drain pipe to bridge the two side?
If I don't need to bridge the concrete below the pipes, I suppose I could leave a step in the existing ground below the drain pipe up to 100mm below the pipe and fill that with pea shingle?
Any advice will be much appreciated.