Advice on shed concrete base please

Having spend a while researching sheds I have decided on a Yardmaster metal one. The shed base is 2.85x2.26m, Yardmaster recommend a base 4" larger than this, will the water run off tend to make its way between the shed walls and base, if so I guess I will have to install guttering. About the base though, any help on the construction of this would be welcome. Depth of concrete, hardcore and how far the base should be above the surrounding soil, indeed anything else that would help me. It will be built on an area that has been cultivated. TIA
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Hi
wrote:

We bought a Yardmaster metal garage last year - and, to be honest, I could not recommend it.
The watertight seal on the roof and the sides relies on a plastic washer under the head of a series of tiny self-tapping screws - and there was a considerable amount of fiddling and levering necessary to get all the holes to line up. In the end we resorted to globs of mastic on the screw positions as an unsightly but effective means of keeping the rain out.
As to keeping the rain out of the base - if the construction of your shed is the same as my garage, it is possible to sit the metal framework flush on the edge of your concrete slab so that you can trap a vertical piece of 4" damp-proof-course plastic under the metal cladding to deflect the rain away from the base of the shed. I can't see how you would get an effective seal any other way.....
Sorry to pour cold water (!) on your plan. In our case we wanted a very quick solution to a house-moving storage problem - but, in the end, we decided that we could have hand-built a timber shed with a plastic or felt roof just as quickly, cheaply and easily....
Regards Adrian

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says...

Can't comment on choice of shed (but could recommend Timbergarden sheds based on our recent experience - very happy with our new shed!!) but, for concrete base, builder came up with recommendation that I'd definitely use again.
Lay a rectangle of concrete blocks (will need a concrete base but don't need to go over the top as they'll be pretty well bonded at the next stage).
Make sure they're level & square, then fill in with 100mm MOT & 100mm concrete.
No shuttering required, you've got two guides to level the concrete off with, and end up with a neat, square edge.
--
Richard Sampson

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