Published on March 29th, 2016 | by Henri0
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.by