Sealing a shed on a concrete base.

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Hi folks,

my mum bought this shed http://www.buyshedsdirect.co.uk/garden-sheds/metal-sheds/10-x-8-yardmaster-green-metal-shed and had some builders assemble it on a concrete base.

the assembly was done however they've not sealed it. being lancashire the rain water is coming through the base.

Now from some basic research i've read about black jack and how its to be applied from the outside - what else can i do?

one other thing - two of the sides are against a wall and are impossible to get access.

http://imgur.com/a/aVzA9

this is the shed

as you can see the gaps are a bit tight to get inbetween. so what can i do externally or internally?
 
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6 tubes low modulus grey silicone sealant applied round the base from the inside will go a long way to keeping any rainwater out.
Ideally the footprint of the base would not extend past the the footprint of the shed.
 
I would unscrew it from the base, prise it up a little and then squirt the silicone under the metal base, and then fix it back down.

If you coat the concrete base with anything to stop damp, then you will need to lay a board or something over the top.
 

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