Installing wooden blocks around the.
Ceiling can lights insulation.
Apply the sealant around the cable and along the edge of the cover where it rests on the ceiling.
You also lose a lot of heat.
Construct a circular dam to place around each can with wire mesh or sheet metal if the lights are not ic rated.
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.
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.
The lights malfunction is a concern and a safety hazard.
According to the department of energy recessed lights account for 50 of the total thermal losses of a ceiling.
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.
Pushing the insulation away is not an effective solution since it creates air passages in the building envelope and wastes energy.