On Jan 25, 12:04 pm, geraldthehamster wrote:

You're not condensing the vapour. You're preventing it penetrating
into a colder space, and condensing there. Ventilation from the
kitchen should be to the outside, by means of windows or an extractor,
not into a cold roof space, where it will promote rot.

That's why ;-)

thanks for the info

I too have a kitchen ceiling to repair

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