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Old 10-02-2010, 01:23 PM   #1
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Seal recessed lights with duct mastics?


I'm thinking about ways to seal recessed lights. One option is to use the foam box to cover the can in the attic. That seems to be too much work since those can's are covered in insulation. Can I simply seal wire penetration on the can with duct mastic from inside the can? This way I would be able to work from inside the room.

One more thing, I can't find IC label on the can, but they were buried under blown in insulation. I suppose this is what the builder did. Where exactly am I suppose to find the IC label? If these can's are not IC rated, I guess I need to remove the insulation around them?

By the way, these can's are airtight ones (But not airtight enough in my opinion, that's why I still want to seal them). Are there airtight can's that's not IC rated?


Last edited by deerhunter; 10-02-2010 at 01:27 PM.
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Old 10-02-2010, 01:34 PM   #2
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Seal recessed lights with duct mastics?


Is there any stamped writing that you can see from the inside of the can to determine if they are in fact IC? Might see something on the UL sticker also.
I sealed up a few of my cans and I used that aluminum foil duct tape, I don't think I would use mastic.

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Old 10-02-2010, 01:40 PM   #3
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Seal recessed lights with duct mastics?


I also considered the foil tape. But I tried and it's hard to wrap it around the penetration.

And I found the IC label inside the can.

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Is there any stamped writing that you can see from the inside of the can to determine if they are in fact IC? Might see something on the UL sticker also.
I sealed up a few of my cans and I used that aluminum foil duct tape, I don't think I would use mastic.

Last edited by deerhunter; 10-02-2010 at 01:44 PM.
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Old 10-02-2010, 01:44 PM   #4
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Seal recessed lights with duct mastics?


how big of an opening are we talking? Maybe some high temp silicone RTV?
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Old 10-02-2010, 01:52 PM   #5
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Seal recessed lights with duct mastics?


Just the wire penetration, not big. With the wire going through it's hard to cover it tight with tape. What gaps you used foil tape to seal with?

By the way, is it ok to caulk the gap between the can and the drywall (with the cheapest kind of caulk)?


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how big of an opening are we talking? Maybe some high temp silicone RTV?

Last edited by deerhunter; 10-02-2010 at 01:55 PM.
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Old 10-02-2010, 02:02 PM   #6
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Seal recessed lights with duct mastics?


I caulked around the drywall with the cheapest latex caulk that I could find.
I had a few extra slotted holes which I think were for adjusting the protrusion of the can thru the ceiling board maybe 4 holes @ 1/8"x1/2" maybe a couple more for the springs that holds the trim on too.

We had some asian beetles or ladybugs that were finding their way in, we have lotsa boxelder bugs too. Just not in the house any more!

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