Rising Water

This Forum is for all questions relating to Rising damp, Penetrating Damp, Basement Drainage, Cracked Masonry and Wall tie replacement.

Moderator: Moderators

Post Reply
Mark-J
Senior Member
Posts: 315
Joined: Tue Mar 29, 2016 11:10 am
Has thanked: 59 times
Been thanked: 9 times

Rising Water

Post by Mark-J » Mon Dec 10, 2018 12:58 pm

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.
Rorschach
Senior Member
Posts: 3719
Joined: Wed Feb 26, 2014 9:35 pm
Has thanked: 46 times
Been thanked: 754 times

Re: Rising Water

Post by Rorschach » Mon Dec 10, 2018 1:41 pm

The ground level outside should be lower than the DPC otherwise its pointless having it there.
Mark-J
Senior Member
Posts: 315
Joined: Tue Mar 29, 2016 11:10 am
Has thanked: 59 times
Been thanked: 9 times

Re: Rising Water

Post by Mark-J » Mon Dec 10, 2018 2:21 pm

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.
Rorschach
Senior Member
Posts: 3719
Joined: Wed Feb 26, 2014 9:35 pm
Has thanked: 46 times
Been thanked: 754 times

Re: Rising Water

Post by Rorschach » Mon Dec 10, 2018 3:11 pm

You need 150mm if I recall correctly.
These users thanked the author Rorschach for the post:
Mark-J
Rating: 7.14%
Mark-J
Senior Member
Posts: 315
Joined: Tue Mar 29, 2016 11:10 am
Has thanked: 59 times
Been thanked: 9 times

Re: Rising Water

Post by Mark-J » Mon Dec 10, 2018 5:06 pm

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.
Post Reply

Return to “Damp Proofing and Remedial problems”