Hi,
I'm in a victorian house (1890) in London, this is at the back, in the side return (1m wide by 8m long), fully concreted over.
The main rainwater downpipe that collect all rain from all roofs at the back falls with a bend into a clay gully. That gully is recessed quite a bit below the cemented ground level, the cement was shaped to form a hollow. In addition, the kitchen soil pipe (sink, washing machine, dishwasher, boiler) also empties in there.
We now have damp on the inside wall, and noticed lots of cracks around the gully which seems to have sunk a bit. The 2 pipes splash a lot the surrounding area. I have broken all the cement, which was hollow, fully of voids, etc... I've cleared all the sludge from the gully. It feels smooth without any cracks. This is now what I've got (i've removed the rainwater downpipe for the picture):
How to make this good?
I thought to raise the level of the square gully using a riser:
https://www.drainagesuperstore.co.uk/product/square-hopper-riser-110mm.html
How to you attach that to the clay (glue, silicon, resin) ?
Other problem is the clay top level is not horizontal, it seems to be at an angle, I don't know how to adjust that. Maybe I'll have to cut the bottom of the riser to adjust for the level?
To reduce the number of pipes getting into the hopper, I thought of merging the kitchen pipe into the rainwater downpipe. I think this is not allowed in new builds, but this is a combined system, and 30cm below it would get merged anyway, so I'm assuming it's ok to do.
Maybe using one of these:
https://www.drainagesuperstore.co.u...0mm-single-socket-triple-boss-pipe-black.html
https://www.drainagesuperstore.co.u...es/110mm-single-socket-access-pipe-black.html
Is this ok?
Do I need one of these?
http://www.wickes.co.uk/Wickes-Terracota-Drain-Inlet-Hopper/p/435196
If I need this, I have no idea how to make the round section at the bottom fit the square clay hole I've got.
I though maybe the downpipe could "end" directly inside this (without being sealed/glued). This means I wouldn't have to end the downpipe with a bend and make it splash all over the grate? In other words, do downpipes always have to end with a "Bottom Offset Socket Bend" ?
https://www.drainagesuperstore.co.u...e-solvent-weld-socket-bottom-offset-bend.html
Finally, I thought of filling all the gaps with gravel and finish it off with a thin layer of cement on top. Do I need any additives in the cement like PVA to make it extra waterproof?
Should I just pay someone?!!?
Thanks for any pointers!
T
I'm in a victorian house (1890) in London, this is at the back, in the side return (1m wide by 8m long), fully concreted over.
The main rainwater downpipe that collect all rain from all roofs at the back falls with a bend into a clay gully. That gully is recessed quite a bit below the cemented ground level, the cement was shaped to form a hollow. In addition, the kitchen soil pipe (sink, washing machine, dishwasher, boiler) also empties in there.
We now have damp on the inside wall, and noticed lots of cracks around the gully which seems to have sunk a bit. The 2 pipes splash a lot the surrounding area. I have broken all the cement, which was hollow, fully of voids, etc... I've cleared all the sludge from the gully. It feels smooth without any cracks. This is now what I've got (i've removed the rainwater downpipe for the picture):
How to make this good?
I thought to raise the level of the square gully using a riser:
https://www.drainagesuperstore.co.uk/product/square-hopper-riser-110mm.html
How to you attach that to the clay (glue, silicon, resin) ?
Other problem is the clay top level is not horizontal, it seems to be at an angle, I don't know how to adjust that. Maybe I'll have to cut the bottom of the riser to adjust for the level?
To reduce the number of pipes getting into the hopper, I thought of merging the kitchen pipe into the rainwater downpipe. I think this is not allowed in new builds, but this is a combined system, and 30cm below it would get merged anyway, so I'm assuming it's ok to do.
Maybe using one of these:
https://www.drainagesuperstore.co.u...0mm-single-socket-triple-boss-pipe-black.html
https://www.drainagesuperstore.co.u...es/110mm-single-socket-access-pipe-black.html
Is this ok?
Do I need one of these?
http://www.wickes.co.uk/Wickes-Terracota-Drain-Inlet-Hopper/p/435196
If I need this, I have no idea how to make the round section at the bottom fit the square clay hole I've got.
I though maybe the downpipe could "end" directly inside this (without being sealed/glued). This means I wouldn't have to end the downpipe with a bend and make it splash all over the grate? In other words, do downpipes always have to end with a "Bottom Offset Socket Bend" ?
https://www.drainagesuperstore.co.u...e-solvent-weld-socket-bottom-offset-bend.html
Finally, I thought of filling all the gaps with gravel and finish it off with a thin layer of cement on top. Do I need any additives in the cement like PVA to make it extra waterproof?
Should I just pay someone?!!?
Thanks for any pointers!
T