Garage damp problem.

Since having a garage built & rendered I have been plagued with dampness getting in at the point where the roof & the concrete blocks meet. There is a small parapet on top of the front facing garage wall built I presume to make the garage look good from the front & to hide the roof from the front. This is the point where the damp gets in. I have been concentrating on the felt etc here but am beginning to think that I am on the wrong track. It has just struck me that the copings could be the problem. They are 5.5 inch copings & with the 4 inch blocks & the rendering on the garage walls the copes have virtually no overhang. I have phoned the local builders merchant looking for 8 inch copes but he says next size up is 11 inches which is obviously too big. Has anyone else had this problem? What did you do to solve it.
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If longer copes is the solution buy 11" - hire a disc cutter and shorten them to suit.
Maybe there's a local firm specialising in brick & tile cutting - I recall seeing one such firm in the midlands - Atherstone, I beleive
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I had thought of that but I don't know if cutting a coping would make the cut edge porous, which wouldn't help with my problem.
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get the manufacturers name and contact them - they'll tell you if it is advisable. For instance Marley offer huge amounts of technical advice both for the builder and the novice.
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