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 Post subject: Rising Water
PostPosted: Mon Dec 10, 2018 12:58 pm 
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Hoping someone might be able to help me.

My shed's concrete floor has damp coming up from the ground below. Actually, I don't think it's damp, not in the standard sense. I think it's moisture due to rainfall. The footings have DPC going all around but I've been told that DPC stops water vertically not horizontally. Apparently, the water is rising upwards, and then it is seeping sideways across the DPC, and then the breeze blocks are soaking up the water that's sitting on the DPC.

Here are a few pics:

Image

And

Image

I was told this is what is actually happening:

Image

So I was told to make a concrete triangular fillet like this:

Image

However, I was going to construct a roof, and in doing so, I'd have dry ground, it would protect the wall from rain, and I'd also have an extra storage area. At least that's the thinking behind it:

Image

Ideally though, I was wondering if there was a third (better) way to tackle the problem.

If at all possible, I would like to avoid digging a soakaway because I have an armoured electrical cable running underneath the patch of ground. More than that, I'd just like to avoid digging a channel in the garden.

Any suggestions?

Thanks all.


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 Post subject: Re: Rising Water
PostPosted: Mon Dec 10, 2018 1:41 pm 
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The ground level outside should be lower than the DPC otherwise its pointless having it there.


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 Post subject: Re: Rising Water
PostPosted: Mon Dec 10, 2018 2:21 pm 
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Rorschach wrote:
The ground level outside should be lower than the DPC otherwise its pointless having it there.

Good point.

I think right now it's about level. But I always had a mind to take a few inches off the top when the weather breaks.

Thanks for replying.


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 Post subject: Re: Rising Water
PostPosted: Mon Dec 10, 2018 3:11 pm 
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You need 150mm if I recall correctly.



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 Post subject: Re: Rising Water
PostPosted: Mon Dec 10, 2018 5:06 pm 
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Rorschach wrote:
You need 150mm if I recall correctly.

I've just been out in the garden with the spade and cleared a good 75mm off the top, might be closer to 100mm (though that's probably wishful thinking). I've got quite a lot of cover on that side so I'm hoping that will be enough.

I'll see how it goes the next bucket of rain we get. I'm in Wales so it should be any minute now.


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