Air tight recessed lights on first floor

Pendleton123August 26, 2012

Hi all, been looking for an answer to this but can't seem to find. I remodeled my 1st floor and put some recessed can lights in. The contractor put in IC, non-air tight cans. Should I put in airtight trims? I know it isn't as big a deal as drafty cans that are under an attic, but I have to wonder am I just wasting energy by essentially turning the formerly unconditioned interstitial space between 1st and 2nd floor into a conditioned space. Any thoughts or links appreciated. I ask because the air tight trims in the style I want are twice the cost of the already spendy non-airtight trims. It adds up quick.

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brickeyee

"formerly unconditioned interstitial space between 1st and 2nd floor into a conditioned space"

It is already conditioned space.

Anything within the buildings thermal envelope is conditioned space, even if you do not directly heat or cool it.

    Bookmark   August 26, 2012 at 1:53PM
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attofarad

As brickeyee said, you are already heating that space. The R-value of the flooring above is maybe R-2 to R-3, and the sheetrock below is R-0.5. If it isn't well sealed from the outside, adding holes in the ceiling will create some additional loss, but it is already about the same temperature as the house -- maybe warmer if you have heater ducts in there.

    Bookmark   August 27, 2012 at 3:41PM
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Pendleton123

Great, thanks guys. My HVAC ducts are in there - insulated flexiducts.

I went and got the non-air tight trims (Halo 353SN - very sharp)

    Bookmark   August 29, 2012 at 10:58PM
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