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Old 01-28-2009, 08:04 AM   #1
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what are the tricks to insulating above recessed lights?


I'm working on an addition that has cathedral ceilings. There are 6 air tight recessed IC lights going in the ceiling, and I'm looking for a good way of insulating above these. I'm going to have closed-cell foam sprayed to the underside of the roof, but is there something with even higher R-value that I can put above the recessed lights? There is only a two inch or so gap from the top of the light housing to the bottom of the roof deck.

thanks in advance for any suggestions!

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Old 01-28-2009, 10:37 AM   #2
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what are the tricks to insulating above recessed lights?


I don't think your going to find anything that gives better Rvalue in 2" than foam. I'd call the light manufacturer and make sure it's ok to spray the foam right on the can cause if you only have 2" clearance the can will get sprayed.

I don't have any experience with the can lights but I believe I read somewhere that some IC rated cans have built in overheat sensors and can trip when covered really well with insulation even though they are IC rated. Hopefuly someone will chime in and enlighten us about that.

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Old 01-28-2009, 12:22 PM   #3
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what are the tricks to insulating above recessed lights?


these are Juno brand IC lights, and yes they do have the overheat sensors.
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Old 01-28-2009, 03:12 PM   #4
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what are the tricks to insulating above recessed lights?


Even though they are IC rated cans, they can still get to something like 194 degrees before kicking off. I don't think rigid foam board insulation in contact with a can light is a good idea because it can melt and is highly combustible. My suggestion would be an unfaced fiberglass bat at each can, and whatever insulation you want elsewhere.
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Old 01-28-2009, 03:36 PM   #5
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what are the tricks to insulating above recessed lights?


KC - I'm planning on using spray foam insulation, not the rigid foam boards. The spray foam installer says the product can be sprayed on IC housings...
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Old 01-28-2009, 04:17 PM   #6
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what are the tricks to insulating above recessed lights?


It can be. It is a different product altogether and is supposedly reasonably fire safe. Be sure that they don't get foam in the housings or the boxes of the cans.
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Old 01-28-2009, 07:45 PM   #7
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what are the tricks to insulating above recessed lights?


ok - i'll pull the cans out after they've sprayed and make sure the foam hasn't expanded into the housings and trim anything away that has made it's way inside...

thanks
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Old 01-29-2009, 03:45 PM   #8
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what are the tricks to insulating above recessed lights?


So did the manufacturer of the cans say it's ok? I really would ask.
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Old 01-29-2009, 06:54 PM   #9
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what are the tricks to insulating above recessed lights?


I'm redoing out bathroom. Above the bathroom is our attic. There use to be blown insulation with FG rolled over the top. I can't use the blown insulation but I plan on using faced insulation and pull the old rolled insulation over the top. I was going to buy R-30 but I didn't know if it is possible to over insulate.

Help!!!!

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