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Vents in Retrofit Cavity Walls to fix Damp Issue?

Postby BMax » Mon Jan 20, 2020 10:16 am


I have a damp loft , 97% humidity to be exact and a gable end I could put a vent in. Why so damp ? well my house of 1950's vintage had cavity wall insulation installed along with bleeding expanding closed cell foam insulation in the loft. Hence I have condensation problems in the house. The loft seems to be hermetically sealed so needs some ventilation. Access to the outside of the house would require scaffolding so I have been looking at one of these. ... _container

The question is will the seal on this be ok to stop water getting at the wall insulation?

Or is there another way better way ?

Thanks for any advice
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