What To Do With This Gap After Concrete Base Poured

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Evening, so I had a concrete pad recently done. When I dug the original site out - I went a bit wider as I wanted to get some 'good' tree roots out. Now the pad has been done, there are 2 sides where there are sizeable dips around the concrete pad (see images)

I was just planning on filling in with some of the soil I excavated, however should I instead fill with something else - e.g. Builders/sand to the depth of the bottom of the formwork then soil on top - material that can be compacted better/quickly?

I'm confident the sub base was compacted - (done with plate whacker + manual tamper)

Thks

IMG-20210501-092337.jpg


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C

Captain Nemesis

What's the base for?

If its a shed/summerhouse/etc then extend the trench all the way round, line with membrane and fill with gravel, to stop water splashing up onto the walls.


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