wet shed base

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I can't really tell from the photo, but I still think that the cladding isn't lapping over the floor enough and with it being so close to the patio, water will be splashing up at the join and getting in. I'm no expert, but that's what it looks like could be happening to me.

It seems odd they haven't started the cladding off at the bottom with a full board, like they had some offcuts lying about so used them as the starting piece. You could try and seal it with silicone just to see if it makes a difference.

Here's a pic of the back of my shed when I was cutting out for some double doors. It's amazing how far up the water actually splashes, all that dried mud was from after it had just rained before I lowered the ground level.

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A lot of sheds I've seen don't have wood lapping to the floor.

Definitely your problem is that it isn't raised off the main ground level, i.e. your patio is the ground level and water will potentially pool underneath shed, certainly not drain quickly away from the edges.

As I said before, my shed is raised above ground level with patio slabs positioned where the joists are. Not a sign of damp.

I'm not sure on the easiest solution but perhaps a couple of palette trolly jacks could lift it up enough? Are you able to get behind the shed? (climbing over it of course).

Will plastic alone resolve your problem? Probably make it better but it wouldn't be the solution I would go for. My last shed was only on patio slabs and didn't have any damp issue and sat there for 10 years. When I took the shed down and removed the slabs, you could see the water had channel underneath washed away a lot of the fine hardcore I'd used - just shows the slabs did the job!

If you could get 6-10 patio slabs underneath (one side at a time) that would probably be easier than trying to get plastic underneath (probably requiring the whole shed to be raised off the ground).

Just my 2p's worth
 
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A lot of sheds I've seen don't have wood lapping to the floor.

Definitely your problem is that it isn't raised off the main ground level, i.e. your patio is the ground level and water will potentially pool underneath shed, certainly not drain quickly away from the edges.

As I said before, my shed is raised above ground level with patio slabs positioned where the joists are. Not a sign of damp.

I'm not sure on the easiest solution but perhaps a couple of palette trolly jacks could lift it up enough? Are you able to get behind the shed? (climbing over it of course).

Will plastic alone resolve your problem? Probably make it better but it wouldn't be the solution I would go for. My last shed was only on patio slabs and didn't have any damp issue and sat there for 10 years. When I took the shed down and removed the slabs, you could see the water had channel underneath washed away a lot of the fine hardcore I'd used - just shows the slabs did the job!

If you could get 6-10 patio slabs underneath (one side at a time) that would probably be easier than trying to get plastic underneath (probably requiring the whole shed to be raised off the ground).

Just my 2p's worth


Sounds like a plan,

The shed has 4 or 5 bearers I imagine how many slabs do I need per bearer to give it enough support ?

Shed is 11' long

I don't think the bearers are close enough to put 2 onto one slab (I will measure this though)
 
I'd just get cheap (level/smooth) ones and if you're wanting it to look nice at the front you could either get slabs the same as you have or do like I did and get some matching wood (I just used a length of decking) to cover the raised section.

My shed is an 8x6 and I used 4 slabs on the width and 5 on the length (I was 2 slabs short so broke 2 in half). Probably overkill but that along with some extra ply on the shed floor the thing doesn't move (no bounce).

You might just fit it one slab between two bearers but your shed is much bigger than mine. While you're doing it I'd just aim for 6-8 along the length and 4 or so along the width with plenty dotted about in the middle (I put more along the bearers that would be walked across).
 
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