Leak from the ceiling

Hi @accelerator thank you. Gutters were just cleaned before Christmas so all clear on that side. Only thing I can think of is that huge amount of snow we had few days ago that might have created a problem. But the question is from where? I am thinking to climb on the roof tomorrow morning when there is a good visibility and have a look for any signs. The issue is it might be so small and will be hard to figure out. I have also ordered a gorilla waterproof seal to roll it on the mortar joint but thinking whether this will ne a right move or not?
 
You look to have a small triangular shaped damp patch with what might be a small hole in it neear the corner. Also is that a skylight in the pic.. Either of those coulld leak with a large covering of snow sat on them for a few days.
 
Sorry what does that mean.

The coping stones have a drip channel on the underside. When it rains the water that runs off them should reach a channel routed into the underside so that it can not track backwards (towards the parapet). In your case, there is not visible drip channel.

That said, your problem seems to be related to thawing snow rather than heavy rain fail. My (lay) gut instinct would be that the height of the snow allowed water ingress that would not be an issue were it just rain.

As I said though, it is not my area of expertise.
 

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