Sorted a base for a shed about 16years ago. Base was cut into a slight
slope (about 12" front to back - shed ia 6 x 8) soil is solid clay.
Laid 1" or so of pea shingle with fencing weatherboards at right angles
to joists in shed floor. I am just seeing signs of subsidence in one
corner - not surprisinly where the downcomer from the gutter discharges.
Unless it is going to form the floor of the shed, a concrete base is
unnecessary work and expense. Is this a bought or DIY shed?
In the last house I bedded some half concrete block down into weak dry
mix sand and cement, and put timber bearers (fence posts) across those,
resting on bits of DPC. The shed floor was then put on that, a little
bit of a step up but that was no problem - did consider mesh a round to
keep out animals, but it was never a problem. Plenty of under floor
Some alternatives timber bearers laid on gravel, or cheap paving slabs.
But if the shed floor is straight on that I'd expect it to rot quicker
This comes up a lot here, I wonder if it has made it into the wiki. If
not a google groups search should turn up old posts
For a smallish shed plastic pallets can make a good rot proof base ,
while not as easily available for free like wooden ones they are still
cheaper than the proprietary plastic base systems which aren't much
different and expensive.
And there are some light weight plastic pallets around which would
not be suitable.
Last month I ordered 3 for a small shed base,the shed being moved
twice in a fortnight for garden works making anything more permanent
Led to a conversation with the delivery driver a bit like a Ronnie
Lorry draws up
Me Are you delivering 3 pallets?
DVR No,Only one
Me Should be 3
DVR Only one on sheet
Me Bggr ,I'll sort it later lets get the one off.
DVR opens tailgate revealing pallet with black clingfim approx 2ft
high top of it
Me That's 3 pallets
DVR No only one, wheeling it onto tailift
Me Cuts open clingfilm with pocket knife, Look, 3 pallets
DVR Still only one on sheet
Me They've put 3 on another
DVR So you've got four then
Me Looks like it, What happens to the fourth pallet
DVR You keep it
4" is common on similar amount of well packed hardcore for a full on base.
But if the ground is firm, you can get away well enough with paving
slabs on a layer of sand.
Or 2 walls with 2x4" decking bearers (joists) across.
My 10x8' shed sits on five 8' fence posts (on top of a level-ish area of
slabs) with some bits of slate to correct for minor slope on the slabs.
No sagging or bouncing (18mm boards for walls, floor and roof).
2x4" spaced 400mm over a 6' span will give a pretty decent floor for
normal use - add noggins for stiffness.
The 400mm spacing is standard and suits sheet materials used in flooring
both in terms of convenience and adequate support.
You could get clever and put the supporting walls at 1' and 5' giving a
cantilevered base with a nominal 4' between supports - that would be
All assuming it's a shed and not a workshop with large machines?
If it's to be the actual floor yes. If it's to support a separate shed
floor, as you get with a bought shed. Then bearers at 2 foot centres, as
suggest elsewhere is fine (IIRC that's what I used when I did mine -
10x6 or 10x8 shed)
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