Condensation On Rafters

Joined
27 Jan 2008
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Location
Cumbria
Country
United Kingdom
Im currently working on converting an old bran we have into a usable space. I was up a ladder yesterday and spotted some damp on one of the rafters. Its an old barn with a pitched roof, and the darm spots were quite obvious. Ive circled in the photo where I noticed the wood was damp.

The roof was done before we moved in, and is less than 2 years old. Ive inspecte the outside closely, and had a builder friend look.....cant see any problems....no loose tiles, and it looks a nice job.

My builder friend has suggested that its likely to be condensation. Ive never spotted it before, but have recently done the wall insulation, and floor insulation, so perhaps theres more moisture going up in the air than ever before. His suggestion was to check the ceiling insulation, make sure its thick enough, and then install a membrain over the top of the insulation, to prevent moisutre getting up there.

The previous owner boarded the ceiling (badly), so im going to have to take the boarding down, and see what the state of the insulation is, then either replace it with thicker, or just put a membrain over. In my head, Im thinking that the moisture has to go somwhere, so would instead just accumulate on the membrain?
 

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