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Groundwork & Foundations

Laying concrete shed foundations over paving slabs

Anonymous user 28/02/2024 - 3.06 PM

I am planning on laying concrete foundations for my new shed. There is already a paving slab foundations left over from the old shed which is level with the lawn. I want my new foundations to be 2 inches above the lawn. Can I pour concrete over the old slabs? Is 2 inches of concrete too thin? Are there any issues with this?

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1 Answer

Anonymous user

2" of concrete would be to thin you would need 6" or more depending on the size, personally i would remove the slabs dig out 6" of soil then fill it with concrete so its level then place the slabs on top, if you were to pour concrete on top and there was movement in the slabs it would crack the concrete and cause movement in your new shed which could cause problems with split boards and door jamming etc.

Answered24 August 2014