February 5, 20242 yr Hello all i need to install a sump and pump to remedy a waste line that's got a couple of bellies. the fall was always only "just" ok so it's time to bite the bullet. it's only to serve a couple of very occasionally used shower rooms so I plan for a relatively modes sump basin. the sump basin will be buried under some placed (rather than concreted ) crazy paving. my question is about the base for the sump. i've got some hardcore in there at the moment. In France, where I installed a sump a few years ago, the advice was just hardcore under the sump, place the sump and level it, fill the sides with hard core to about 12" from the top and finish the rest with concrete (putting some heavy things in the sump to prevent ground water from moving/lifting it before the concrete had set up. Is this the norm in the UK - I've seen references to concreting a 10cm slab for the base over here. thanks justin
February 5, 20242 yr 5 minutes ago, jpadie said: Hello all i need to install a sump and pump to remedy a waste line that's got a couple of bellies. the fall was always only "just" ok so it's time to bite the bullet. it's only to serve a couple of very occasionally used shower rooms so I plan for a relatively modes sump basin. the sump basin will be buried under some placed (rather than concreted ) crazy paving. my question is about the base for the sump. i've got some hardcore in there at the moment. In France, where I installed a sump a few years ago, the advice was just hardcore under the sump, place the sump and level it, fill the sides with hard core to about 12" from the top and finish the rest with concrete (putting some heavy things in the sump to prevent ground water from moving/lifting it before the concrete had set up. Is this the norm in the UK - I've seen references to concreting a 10cm slab for the base over here. thanks justin i would suggest looking at what the manufacturer recommends for the install as a start and then see where that takes you.
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