Hi folks,
So I'm about to embark on a full-width (approx 6.5m) rear extension to span the back of our semi. There's a shared clay sewer (approx 8~9" in diameter) that runs perpendicular to our proposed footings. The sewer serves me and the neighbour but I won't have a need for it once the extension is built as I'll tap into the run further down. The sewer is approx 2ft deep and terminates in a brick-built chamber. From there, the waste goes off towards the main road.
I'm aware of the usual 'lintel over' method and will be seeking a 'build-over' agreement from Severn Trent. They give 2 options: provide a CCTV report or replace it with plastic. I'm opting for the latter but here's the questions:
1) The clay sewer is approx 8~9" in diameter. Every builder I've spoken to has said to reduce it down to 6" plastic using those Jubilee Clip rubber couplers - does this sound right?
2) Is it ok to 'couple' the clay to plastic in the 'linteled over' section of my footings? I guess what I'm asking is how far along should I cut the clay? I'd love to bury the joint (coupler) in the neighbours garden but they won't allow me so it'll have to sit in my footings. Will that be an issue?
3) The span of my extension is 6.4m. That means I need to buy 3 x 3m lengths. Is it OK to have a similar coupler buried underneath my kitchen slab?
4) Am I wasting my time: why fix it if it ain't broke right? Should I opt for the CCTV report option instead?
So I'm about to embark on a full-width (approx 6.5m) rear extension to span the back of our semi. There's a shared clay sewer (approx 8~9" in diameter) that runs perpendicular to our proposed footings. The sewer serves me and the neighbour but I won't have a need for it once the extension is built as I'll tap into the run further down. The sewer is approx 2ft deep and terminates in a brick-built chamber. From there, the waste goes off towards the main road.
I'm aware of the usual 'lintel over' method and will be seeking a 'build-over' agreement from Severn Trent. They give 2 options: provide a CCTV report or replace it with plastic. I'm opting for the latter but here's the questions:
1) The clay sewer is approx 8~9" in diameter. Every builder I've spoken to has said to reduce it down to 6" plastic using those Jubilee Clip rubber couplers - does this sound right?
2) Is it ok to 'couple' the clay to plastic in the 'linteled over' section of my footings? I guess what I'm asking is how far along should I cut the clay? I'd love to bury the joint (coupler) in the neighbours garden but they won't allow me so it'll have to sit in my footings. Will that be an issue?
3) The span of my extension is 6.4m. That means I need to buy 3 x 3m lengths. Is it OK to have a similar coupler buried underneath my kitchen slab?
4) Am I wasting my time: why fix it if it ain't broke right? Should I opt for the CCTV report option instead?