Just put a ProBase down does what says on the tin . Rake surface level add a bit of grit sand lay membrane add the ProBase kit fill with pea gravel job done rock solid base for Log Cabin. Well impressed with results.
Did you bother with the gravel sub base beforehand? On the website i'm purchasing my shed it says not required, but a lot of DIY videos do a gravel sub base first. Seems unnecessary? I'll just do a layer of builders sand, membrane, probase and add some gravel to that.
If you get a tornado a day sure.....gravity is a thing here - weight of shed + weight of items inside will mean the shed goes nowhere, especially in the UK.
