Recessed lighting has become the lighting of choice in modern construction. The ability to light entire areas with multiple lighting rather than singular fixtures that leave shadowed areas appeals to the masses and makes sense from a visual perspective. The one drawback of recessed lighting is that the lights protrude into the ceiling which gives air a pathway into your home.
Studies on air sealing and air penetration at Oakridge National Laboratory confirm that a one square inch hole will allow up to 30 cfm of air to move through it. So as you can see, air sealing around can lighting is very important. But what is more important is to understand what type of recessed lighting you have. Some types of recessed lighting are not rated to be in direct contact with insulation. Other types are. In either case, sealing the can lights can be performed effectively by following a few simple principles.
UL Rating
In order to find out what type of recessed lighting you have, you need to determine the proper air sealing and insulation method. The rating is posted on the inside of the fixture. The UL label is located on the inside wall of the recessed light. It will indicate whether your lighting is rated for contact with insulation. If the lights are not, then insulation cannot touch them.
UL Rating Non-Contact
Build a box out of 5/8 inch drywall that is about 1 inch wider on each side than the recessed light portion that is concealed in the ceiling. This work will have to be performed from the attic. Secure the box to the drywall on the ceiling using metal duct tape. The 5/8 drywall is fire rated so this is a great material for projects where fire retardanty is a concern. Once the boxes are secure over the recessed lighting, seal around the edges with can foam insulation. Make sure to seal all of the edges. Then spread the insulation over the recessed lighting. The lights are now safe and completely air sealed.
UL Rating Contact
For recessed lights with a UL rating for contact with insulation, air sealing these lights is very simple. Use can foam insulation to seal around the perimeter of the light fixture and any penetrations that goes into the can. Then cover the fixture with insulation to protect against the convecting temperatures from the attic.
Sealing recessed lighting can make a huge difference for your home comfort and hopefully, on your pocket book as well.
Adam Yeomans - Adam Yeomans has been writing Internet content for just over a year for the purpose of informing people on how to properly complete home ...
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