Water ingress

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Hi there, I have water running down my wall, please see pics.
Cement was originally where the gap is.
A friend said leave open to prevent damp getting behind any obstruction. Though, I feel if left, the water will spread across the wall and worsen. There's some pooling on neighbours side and I have ran some sealant along the base of the wall on the other side. Despite this, the water's still sleeping through. So, my question is, do I fill in the gap with cement as it was in it's original form? Your thoughts will be most welcome. Thanks
Andy
 

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Thanks chaps, I think some of the water is coming from the neighbours drive, it's on a slope. And my bottom gutter runs off down into the neighbours run away drain.
As it's only a small gap between the garden wall and house, it's hard to truly ascertain where the water is coming from. I have a video, which shows the problem, but the file is too big. I'll see if I can edit it. Cheers
 
That's a fault of the lead not the wall.
I didn't blame the wall, the wall was inocent. It was a combined fault. The gutter downpipe was blocked causing the gutter to overflow, and water to cascade down the wall, and the water then compromised the lead work, but my point was, you shouldn't say "Water running down the outside wall, is not an issue", because it could be.
 
I didn't blame the wall, the wall was inocent. It was a combined fault. The gutter downpipe was blocked causing the gutter to overflow, and water to cascade down the wall, and the water then compromised the lead work, but my point was, you shouldn't say "Water running down the outside wall, is not an issue", because it could be.
Outside walls can get wet, no problem. If flashing, window/door seals, gutters, ducts or terminals are at fault, then this needs addressing.
If you want to argue on behalf of the OP about a problem they don’t have, go ahead and waste bandwidth.
 
Outside walls can get wet, no problem. If flashing, window/door seals, gutters, ducts or terminals are at fault, then this needs addressing.
If you want to argue on behalf of the OP about a problem they don’t have, go ahead and waste bandwidth.
I'm not arguing on behalf of the OP, I'm saying water running down the outside of a wall should not be ignored, unless it's just your normal amount of rain, which this does seem to be. If it's like a waterfall, like it was on my house, it's a problem not to be ignored.

You're saying, water running down the outside of a wall is not a problem, but clearly in my case it was a problem cause by a blocked downpipe, and I wondered when I saw the photos above whether this was gutter related.
 
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