Loft condensation

cyber69

cyber69

cyber69

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Joined
16 Sep 2009
Posts
2,371
Location
Loogabarooga
Happy new year all, i'm starting off 2026 with a loft issue with condensation forming on the felt in the form of water beads all over one particular side near the loft hatch. I've put a sensor up there and it's reading 7deg with 83% humidity, not sure if that's really bad but I think the humidity is quite high.

We had replacement facia's and soffits a couple of years ago so i'm thinking maybe they did not put any or enough vents in to keep the air flowing. To try and resolve it, i've seen some plastic spacers that fit inbetween the felt to provide an air gap, anyone had any experience of using these?
 
We had the cavity wall insulation with the small foam beads and ever since have suffered with condensation upstairs. Have one dehumidifier running in the conservatory and another one running in a bedroom to try and combat the damp.
 
Fitted 12 spacers easy enough and wiped down the felt, the condensation seems to be only in one section, near the top 50% of the apex of the roof, near the loft hatch, rest of the loft is pretty dry compared to that section.

Ordered another 12 spacers just incase as I didn't quite have enough.
 
Just been up there to fit the rest of the spacers and the loft boards are now dry, the felt has a lot less droplets and seems to still be drying so hopefully the spacers have done job.
 
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