It is a good idea to have stones/gravel under your shed for several reasons. This will mean that water the water can escape and does not ‘pond’ beneath the shed. Damp – Having a layer of stone beneath the shed will enable water to quickly soakaway into the ground.Click to see full answer. Accordingly, how much gravel do you need under a shed?As a rule of thumb, your gravel shed base should extend at least 12” further than each side of your shed. For example, if you are building your shed foundation for a 10×12 structure, you should make it at least 12×14.Also, what kind of stone should I put under my shed? We recommend making the gravel base 2′ wider and 2′ longer than the size of the shed you get giving you 1′ on both sides and ends to help prevent dirt from splashing up on the sidewalls of the building. We recommend a 4″ to 6″ gravel base of either 3/4″ stone also called 57’s by some or crusher run. Beside this, what should I put under my shed? #1 Concrete Pavers. #2 Solid Concrete Blocks. #3 Deck Blocks. #4 Gravel Pad and Timber Frame. #5 Skid Foundations. #6 Plastic Foundations (or Plastic Garden Shed Base Grid) #7 Kit from Manufacturer. #8 Concrete Piers and Beams Foundation for a Shed. What is the best base for a shed? Concrete Shed Base Concrete is by far the best shed base for larger sheds or sheds containing heavy equipment.