scott b

Thanks for the reply. We have 2 air bricks in the loft but they're a bit obscured by storage boxes. I'll get them moved and get some air flowing. Regarding the plastic sheet thing, this appears to have been put in place when the house was built then slated over. I've never seen this before. Any reason why this has been used and what I should do about it?

We suffer with bad condensation on our windows and plasterwork around them. I have just been in the loft and found that the roof is covered in condensation. It appears the roof consists of a plastic sheet with the roof tiles / slates behind this. The plastic is wet and has water dripping from it. Pics attached. I was planning on insulating the gaps between joist with fibreglass but worried it will just get damp. Will the fibreglass keep heat in and prevent the condensation or does anyone any other advice ot tips? Thanks