I've got a damp patch (about 1m x 300mm) above this window in the ceiling of a shower room. I suspect it's caused by the moss. Would spraying with glyphosate remove the moss? It's a bungalow built around 1960.
The moss will end up in the gutter and block it but I am not sure the moss is causing your damp patch. It could be that lead flashing on the end of the pitch during heavy rain shooting down and being directed under the tile
Also that lead flashing cut into the bricks doesn’t seem to be doing anything, it should be sitting on top of the tiles. Is water getting down there.
Had a roofer look at it and in their opinion, there's nothing wrong with the roof. They spent some time in the loft and reported the plasterboard was dry up there and only soggy on the underside, suggesting it's a condensation problem. When we bought the place, I uprated the fan to 90 m3/hr from the original (the timer keeps it running for around 20 min after switching off). The room's about 10m3.
I guess I need to consult an HVAC expert.
Get a dehumidifier.
We run two at this time of the year to dry washing and dry out the house. One upstairs and one down for around 4 hours every evening.
No condensation or mould anywhere
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