Dug down to deep for shed base

[Blueclaret]

18:29


"Hi everyone, I need some advice on a mistake I made while digging a base for a 6x4 ft plastic shed. My original plan was to dig down 90mm total, but while trying to get it flat, I accidentally over-dug it to 200mm depth. The area is 7x5ft. I already have 11 large bags (25kg each) of Tarmac MOT Type 1 sub-base and I'm hiring an industrial petrol wacker plate.
I cannot afford to buy more aggregate right now.


Can I safely put the dug-out soil back into the bottom of the hole
in thin layers and use the industrial wacker plate to compact it back down before adding my 11 bags of sub-base, or will this cause the paving stones and shed to sink later? Thanks for the advice

 

[Koolpc]

Should be fine.....

 

[Blueclaret]

AI says don’t because it will sink eventually even with a whacker plate what I’ll hire. Dunno what to do

 

[Koolpc]

AI is cráp

 

[stevie888]

With that hand tamp you don't really need a wacker, just a bit of sweat.

Type 1 will compact better if damped down

 

[Deluks]

If you backfill with soil, mix a couple of bags of cement in with it to firm it up.

 

[Blueclaret]

Ok thanks

 

[stevie888]

Save the cost of the wacker and buy more type 1 would be best option.

 

[aveatry]

I have a hand tamper and they can be a real pain to use on soil espicually when adding, because layer you just put down sticks the the base and instead tamping down you just end up with a load of dents.

 

[Deluks]

Let's rewind to the start, plastic shed!
You don't really need to do anything. If you can stand on it without making an impression into it, you'll be areet!

 

[ericmark]

My shed is on plastic pallets, so nothing stays wet.