A few years back I came across an article in one of my magazines about insulating non-ic can lights using reflective-backed foam board boxes. These were constructed from 2″ insulating foam if I recall, and were secured to the sheetrock in tne attic above the light using caulk. Does anyone know anything about the article, the safety of such a procedure, or other suggestions for closing up these energy-suckers short of replacing them?
Thanks
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Used to do the same thing, made the boxes out of scraps of rigid polyiso, foamed the pieces together and "clamped it" with a few wrappings of duct tape while the foam cured. Never removed the duct tape.
Had two houses where we had to line the boxes with drywall.
Was concerned about heat build-up the first time, so we overlamped one of the cans then stuck a thermocouple through the foam. No excessive temps, thus no reasons for concern with a properly lamped can.
Excessive temp wouldn't be any problem at all with today's cfls.
Thanks Mongo, I'm going to give it a try.
It sounds like a good idea. Make sure to maintain proper clearance between can and box. Depending on how old the can is, it may be difficult to find the literature you need. The internet would be a great resource.
They did this 15 years ago in the NW a lot. Was OK w/ the BO, I think. Generally worked great ... until you step on it accessing the attic. :)
Thanks Clewless1 - stepping through ceiling drywall is my 21-year-old son's specialty.
Yup - a great air-sealing tip, just maintain your clearances as listed on the can light and you're good to go!
Justin Fink - FHB Editorial