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Shed base queries...

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andyoxon:
I've partially excavated the area, which was part patio (in corner), part ex-greenhouse - taken it back to non-level heavy clay substrate.



The 5x6 shed (existing) would be moved into the corner and the new 8x12 shed sit next to it...

I have 8x 3'x2' mega slabs and thought I could use six of these to do the area in the corner.  Buy the rest in 600x600mmx50mm in.  I actually have 25 30mmx450mm slabs I dug up that used to comprise a wonky mini patio (they'd built on builders sand!).

Also have a large mount of pebble/shingle/gravel/whole and part bricks/concrete blocks... which could used for hardcore. But advice seems to be don't put hardcore down for slab base, is this right?

Does one need to compact dry sand/cement mix or just level off?

Any tips or ideas?  The drain cover is a real fly in the ointment...

hairyhippy:
Don't, whatever you do, cover the drain. It is a recipe for a disaster. Do not ask how I know this.

Jaded:
It depends just how many in-laws you have to go under the shed  ;D

Feline:
Personally I use a few inches of hardcore and lay slabs with 5-spot mortar for my shed bases. It's probably overkill but makes it easier to get the area level (for me anyway).

citoyen:
The one and only time I've done this job, I levelled the area with a dry sand and cement mix (didn't compact it) and laid slabs without mortar for the shed to sit on (with a row of square fence posts under the shed to raise it slightly for drainage). A hardcore foundation does seem like overkill for a garden shed, which is a relatively light structure, even an 8x12 one.

d.

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