Slab foundation for garden house

Hello everyone

I have a garden shed with a base area of 6mx2.5m, that is 15sqm. Since I also want to create a walking area all around it, the foundation extends to 8mx4.5m, that is 36sqm.

At first, I thought I would create a full-surface concrete foundation, then build an underlying frame using squared timber on it, and then place the garden shed on top. That way it would also be firmly anchored.

However, I have to admit that the foundation slab would already exceed the price of the garden shed and I feel that this is overkill.

After contacting the garden shed manufacturer, they said that a simple slab foundation (paving slabs) is completely sufficient. However, I definitely want to anchor it.

Therefore my question is what you think about the following plan:

I will create a slab foundation made of walkways. 15cm gravel, 5cm paving grit, then the slabs on top. At the corners I will drill 20x80cm deep holes and create a point foundation. The squared timber construction will then be anchored at the corners, through the paving slabs, into the point foundations using bolt anchors. The squared timbers that form the inner frame (where the floor lies on top) will only be laid on the paving slabs and not screwed.

Now my question:
1. Is it bad if only the corners are anchored?
2. Do I need a frost skirt around the slab foundation?

Thank you very much
Best regards Jumbo

You could put a border under the edge of the little house, embed it a little. You can screw the little house to that. We set up our metal garages this way, it holds great. In our experience, you don’t need a frost skirt for this. The depth of the border is also completely sufficient.

You could put borders under the edge of the little house, embed them a bit in concrete. You can screw the little house firmly to them.
We set up our sheet metal garages this way, it holds great. From our experience, you don’t need a frost skirt for that. The depth of the borders is also completely sufficient.

Do you mean curbstones by border?

Yes, exactly. The 30s, 8 width.

Yes, exactly. The 30s, 8 width.

Did you concrete in the curbs?

You could put a border under the edge of the little house, cement it a bit.

Did you cement the curbstones?

I would read it like that.