Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> Roof Vents
In an enclosed roof, that is one that has ceilings to keep the roof space closed off then it is advisable to ventilate it. Providing fresh air circulation in a roof space prevents the build up of damp and so prevents various forms of wood rot and mildew and fungus growth.
In warmer climates the vents are larger and are used to prevent a build up of hot air.
In the photo above of a primary school assembly area there can be seen at the top a ridge vent.
Just under that can be seen a pair of gable vents.
To the left can be seen a wind driven rotary vent.
On the far right is an extractor fan outlet for a toilet area.
To get a good circulation of air more than one type of vent is needed. Air has to be allowed in lower down the roof, so that stale air can exit higher up.
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