I'm in the process of planning to build a 10'x 12' shed at the bottom
of my garden to be my workshop. The soil is a very heavy clay and at
this time of year is quite sodden.

Most of the shed sites seem to state that a slab base is fine for most
uses, but I'm concerned that whilst it maybe fine for a 6'x4' with a
couple of bikes and a lawnmower I'm going to be using this on a daily
basis and it will be storing and handling some quite heavy items. I
don't particularly want it sinking into the clay.

I was considering a 11'x 13' concrete base around 4" thick, is this
overkill (or insufficient)? Also considering the damp conditions how
long will it take a base like that to set before I can construct a
shed on it?

Regards,
Jason.

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