I moved into my house 18 months ago and the back of my flat roof extension has drainage issues.
You can see from the picture that the coping stones don't fit correctly on the corner (red circle) which makes that point become the focal point for all the water run off which is damaging the wall (blue box), and the paint is starting to flake inside the house. I think this is compounded by the greenhouse (orange) which is stopping most water from falling off of the stones onto the roof.
I was thinking about using a dab of cement (at the red circle) to change the shape of the incorrect tile but I am unsure where the water will then run off and I am worried I might make the situation worse if the water then sits against the older, more porous brick wall (black circle).
Here is a close up of the problem:
- Do you think that would be an issue?
- What do you think of my idea?
- What would you do to fix the issue?
All suggestions most welcome. Thanks for your help in advance!