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I have been struggling with a water leak in a flex space I have.

I don't know where it is coming from. I have removed the bottom siding panel, the paper behind and the wood is dry, but the concrete is very wet. I live in Vancouver and it rains a lot here. At first I thought it was coming underneath the siding from capillary action, but now I am inclined to think the concrete itself is the suspect. Thoughts?

How can I fix this? Tar? waterproof paint? Do you guys think it is the concrete or something else? Only the baseboards and floor on the sides are wet inside.

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  • Can you take a picture of what is above that corner on the exterior? It looks like the concrete is far more wet on that corner that just a few feet over (first pic). It might by puddling, but it doesn't really look like it to me. I'm thinking maybe a leak running down that corner on the exterior. – UnhandledExcepSean Jan 4 at 14:27
  • It's because the dry part is undercover. Any side that is exposed to rain is facing the same problem. Basically 3 sides of the space are exposed to rain, and the 1 side is not. – sci-guy Jan 4 at 14:39
  • I think a picture from above that outside corner would still be helpful. Also, a picture of the inside with the plastic lifted. The first picture: is the right side that outside corner? – UnhandledExcepSean Jan 4 at 14:50
  • I have updated the post to show the surroundings – sci-guy Jan 4 at 21:36
  • sorry, but I’m having a hard time seeing how those new pics tie into the old ones. Can you plastic/tarp the entire area and see if the water issues go away? That could help to narrow the cause – UnhandledExcepSean Jan 4 at 22:33
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the reason is the shape and location of this ledge:a white ledge absolutely unsuitable for use here

Therefore, take all the ledge off, look for slits (which are taking water inside from all terrace),
seal them and if need, give on edge some suitable profile you can see here:
https://www.riversidesheetmetal.net/flashing-metal/masonry/custom/

  • Hello, and welcome to Home Improvement. Good picture, but it's still not clear what your concern is, what you think needs fixing, and where the new flashing would be. – Daniel Griscom Jan 6 at 14:19
  • Take what ledge off? And out the flashing where? – sci-guy Jan 8 at 6:14
  • The water damage inside looks more like water is getting in around that window or as johny said. It could be the deck flashing doesn't skirt the water to the outside of the wood siding. Was the water coming in before that shed was there? The shed might be the problem if rain bounces off of it and into the window. – user68386 Feb 8 at 0:50
  • Gutter not wide nor long enough. Bolts from railings probably also leak. If the flashing doesn't go inside the gutter, the whole thing definitely leaks. – Mazura Jun 8 at 3:14

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