Roof Mounted Ventilators
The vents may also be very small in size as compared to the design and size of the sub floor. It is recommended that you use fans which will extract the damp air at least five times in every hour. You should consult a roof mounted ventilators expert who will assess your under floor. He will find out whether the dampness in the under floor is caused by a plumbing issue, a drainage problem or an aeration problem. For More Info:- https://roofquip.co.nz/
https://kaalama.org/post/64638
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