"AndyM" wrote in message
...
Good evening,

Our 1950s roof, tiled with flat terracotta tiles, faces the prevaling wind
here
in not so sunny St Annes. I accidentally ripped the felt and found the
batten
directly over the rip was wet through and quite soft. Looking more
closely,
some of the roof trusses also show signs of water as they have a slight
white
'tide mark' up to an inch from the felt.

I guess the wet batten is a symptom of rain windblown up the roof but
should
the rain get through to the trusses?

Q1. Is this generally a problem or should I wait till summer to see if it
dries
out?

Q2. Is the 'tidemark' likely to be fungal or disolved minerals?

thanks again

AndyM

Sounds more like wet rot and the start of a serious and expensive problem