Lighting

Published on March 29th, 2016 | by Henri

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Don’t use recessed lights with cathedral ceiling

Q.   Are recessed lighting fixtures in cathedral ceilings just a highway into the insulated space?

A.  They certainly are, especially since most cathedral ceilings are erroneously insulated with fiberglass.

If cathedral ceilings are insulated with closed-cell polyurethane, it is a different story. I emphasize “closed-cell” polyurethane; open-cell must not be used in ceilings as it absorbs moisture that is trapped between the roof covering and the interior vapor retarder – assuming there is one.

In any event, though, if light fixtures are needed on a cathedral ceiling, surface-mounted fixtures should be used.

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