"Kipper at sea" wrote in message
...
On Jan 8, 8:06 pm, Donwill wrote:
Fred wrote:
Hi,

I went into our loft to put the Christmas tree away and the rafters
were wet and some of the cardboard boxes up there were damp. At first
I wondered whether some of the snow had melted and leaked through an
iffy ridge tile but I've been told it is likely to be condensation.
I'm puzzled how the warm air gets up there because there's a good ten
inches or so of insulation (rolls). I've been told that once the cold
spell goes everything will return to normal. I am concerned about the
timber getting wet and all the boxes (and presumably their contents)
getting soggy. Is it likely to just be condensation and nothing worse,
and is there anything I can do to limit it? Would wedging slabs of
insulation between the rafters help?

TIA

Insulation (rolls)wont stop water vapour moving from of high vapour
pressure area to an area of low Vp. your easiest and probably best
solution is to make sure that your loft is adequately ventilated, also
your habitable rooms particularily bathrooms and kitchen.
Don- Hide quoted text -

- Show quoted text -

Youve got to get rid of the vapour before it hit the cold inside of
the roof covering. This is done by venting through the highest part
of the roof.


Or stop the vapour entering the roof space, which is the best way and saves
high energy bills.