ᐅ Garden Shed – What Size and Type of Foundation?

Created on: 17 May 2018 07:05
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Rollo83
Good morning everyone.

I am probably planning to set up a garden shed in my backyard after the summer this year. It will be used to store all the stuff that is currently in my garage and is not related to the car.

- Lawn mower
- Gas grill
- Shovel, pickaxe, rake, bucket, and other small tools

Optionally a wheel rack and 2 bicycles, but these items will mostly stay in the garage.

The garden shed will be placed in the farthest corner of my already relatively small garden, so the size needs to be chosen accordingly. In other words, not too small but definitely not too large.
I am considering two sizes:

1. W 1.82 m x D 1.22 m = 2.22 m² (6 ft x 4 ft = 24 sq ft)
2. W 2.12 m x D 1.54 m = 3.26 m² (7 ft x 5 ft = 35 sq ft)

It is important that one of the sides is under 2 meters (6.5 ft) so that the shed fits well into the corner.

The second point is the base. So far, I planned to pave an area of roughly 2 m x 3 m (6.5 ft x 10 ft), put the shed on it, which would also give me a paved area in front of the shed and be done. The advantage is more flexibility with the shed location and probably not the cheapest option.

Now I am considering making a pier or strip foundation and simply placing the shed on that. If needed, I could still pave an area in front of the shed.

I would appreciate some input and suggestions.
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Alex124
24 May 2018 08:28
cschiko schrieb:
put about 10cm (4 inches) of gravel/crushed stone at the bottom, compact it, and then pour the foundations measuring 30x30x30cm (12x12x12 inches).

Why is everyone always so cheap? 10cm (4 inches) of crushed stone is a bit too little, not to mention 30x30x30cm (12x12x12 inches) foundations. That’s barely more than a bucketful—what is that supposed to hold? Concrete doesn’t cost a fortune, so just double at least two of those dimensions to sleep peacefully at night. Sometimes there’s so much fiddling and cutting corners just to save a couple of dollars. Doesn’t anyone build solidly anymore to have peace of mind for many years? I tend to be the opposite—everything a bit thicker, stronger, more robust. So I better spare you my approach here, as it probably wouldn’t be well understood.
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cschiko
24 May 2018 08:56
@Alex124: For me, it’s all about what you place on the foundations! In my case, it’s just a metal storage shed for a lawnmower and similar equipment that will go on the foundations. Of course, you could still go with an 80cm (31.5 inches) deep base, with a 20cm (7.9 inches) gravel layer and a 60cm (23.6 inches) foundation on top. But that would be my approach for the proper garden shed planned for next year. Foundations measuring 60x30x60cm (24x12x24 inches) for a small storage shed seem quite excessive to me. Sure, you can also pour a reinforced concrete slab, but you should keep things reasonable. I also want to add that the shed stands on leased land (which we might be able to purchase eventually, but currently the owner is not willing, and we’re waiting for the right moment to inquire carefully).
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Alex124
24 May 2018 08:59
If it’s only temporary, that’s fine, it’s a different matter and I wouldn’t invest too much effort there.
cschiko schrieb:
@Alex124: Of course, you can also pour a slab foundation with reinforcement
This is my approach... 8m³ (10.5 cubic yards) of concrete and a lot of steel ;-)
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cschiko
24 May 2018 09:19
Alex124 schrieb:
This is my version....8m³ (10.5 yd³) of concrete and a lot of steel ;-)

For the proper log cabin, that is part of the consideration, but for the garden shed, I think simple pier foundations should be sufficient. In my opinion, a concrete slab would be a bit excessive for that.

I’m thinking of increasing the base layer to 20cm (8 inches) of gravel/sand. However, I would keep the foundation size the same; the quantity will ensure that the OSB panels and the grid for the wood are well supported.
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Rollo83
24 May 2018 12:07
You could also use driven ground sockets or sleeves directly embedded in the foundation and then plan and build the garden shed freely with your own dimensions. This idea is currently my favorite, simply because I enjoy building, I can precisely adapt the dimensions to my space, and it also allows for gradual construction over time.
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cschiko
24 May 2018 12:30
Rollo83 schrieb:
You could also embed ground sleeves or anchors directly into the foundation and then freely plan and build the garden shed with your own dimensions.

In that case, I would cast post bases or post anchors into the pad foundations, as they are designed for that purpose. Ground sleeves can work too, but post bases would probably be the better choice. And of course, building it yourself gives you the advantage of determining the dimensions yourself.