Hi all
I bought an old bungalow a couple of years ago which we have renovated, including having a completely new roof put on.
I fitted 120mm PIR between the rafters and sealed along the edges with foil tape. During this cold weather I have come to fit a 20mm PIR across those same rafters but have found water dripping through the 120mm boards. I took a piece out and found a lot of condensation behind the board. I have only found it in one gap, it doesn't seem to be leaking anywhere else?
Why is condensation gathering in this particular spot? What can I do?
Thanks for any help