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?
