Is it actually bulk moisture? What's the outside of that rafter (i.e. the roof) look like? No reason that water should be coming in from ANY fastener on the outside of the roof either way. You sure it's not sap that is yielding from the heat?
was actually a nail pop on the roof. Looks like the hole went perfecty down the wood baord and came out of the knot. I removed the old nail hammered in a larger one and added roof tar. All good now. thanks for all your responses. That was a weird one.
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