I was up in the loft (reading a '60s Haynes) and I noticed a white, possible growth-like on a rafter where it's adjacent to the roofing felt, but it feels hard to a thumb-nail pressing into it. There's the pointed end of a nail sticking out the side of this rafter, so possibly a batten nail? The rafter is black on the top surface heading towards the eaves. I also noticed another, nearby rafter with similar black staining on its upper surface.
It tippled down soon after, so I climbed back up but both rafters were dry.
The house is a 1960s, Wimpey built and the affected rafters are on the North facing side of the pitched roof. I've been in it for nearly forty years.
I'm wondering if this could be some kind of wood rot and the dark staining indicating water ingress.
What's the opinion, get a builder/roofer in to pull off some tiles to check the battens and felt?
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Roof problem? new
Roof problem? new