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And would I seal it with fire lick great stuff or regular great stuff?
It doesn't make a difference. Great Stuff fire block is NOT a fire stop. It is very flammable. It is only intended to draft stop openings. It is orange in color so the inspector can see it at a distance. AFAIK, the color is the major difference.

Fire Stop foams are red, not orange.
 

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I'd first remove the bulb and trim ring to see if these are IC air tight can lights.
If they are you can just insulate over them and see if that makes a difference.
 

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Discussion Starter · #7 ·
Well I took the rim cover off of the light over the sink.
No caulk, second picture up in the light you can see a little 'daylight' meaning were the wires are coming into the canned light, there's no insulation over it. I'll need to verify this when I get over to that side of the attic.
So other than caulk between the sheetrock and light can, what ways could I insulate these lights from the top 'attic'?
Thanks.
 

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Huge letters air tight.
I'd just seal around it with caulking and insulate over it from the back side.
 
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