We have had a base created by our builders which would allow an inch or so of the shed all round to sit on slabs, then under the main part of the shed there would be a solid hardcore foundation with flat shingle base suitable for holding the bearers so plenty of room underneath for ventilation. Is this OK?
The base will need to be a completely flat and level surface on which the shed can sit. Such a base can be achieved using poured concrete or slabs. Bearers although helpful are unfortunately not miracle workers! Even a shingle base would need to be flat and level in order for the bearers to be beneficial.