According to the department of energy recessed lights account for 50 of the total thermal losses of a ceiling.
Ceiling can lights insulation.
The dam should provide a minimum 3 inch space around the perimeter of the can.
Recessed light in a cathedral ceiling recessed lights often leak warm moist air against cold roof sheathing which eventually causes roof rot.
The lights malfunction is a concern and a safety hazard.
If you have recessed lights installed in the ceiling you need to keep the insulation away from the heat generated by the lights because it is a fire hazard.
You also lose a lot of heat.
If you re concerned about heat loss through your recessed lights in a cathedral ceiling turn off the light unscrew the bulb and remove the trim to check the label inside.
Up in the attic clean the ceiling surface around each fixture slit the cover to accommodate the electrical cable and place the cover over the fixture.
Installing wooden blocks around the.
Construct a circular dam to place around each can with wire mesh or sheet metal if the lights are not ic rated.