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Old 04-05-2019, 07:10 PM   #1
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R38 insulation in 2X6 joist.


Hi, i have 2X6 ceiling joist with 16" at center. Can i install R38 faced insulation which is around 10" tall?

Please advice on what options do i have with 2X6 joist to get R38 value.

Thanks
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Old 04-05-2019, 07:14 PM   #2
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Re: R38 insulation in 2X6 joist.


You can if there's enough space above the joist. The batt can't get compressed.

You won't be able to find more than R-24 if you need 6" max thick.

You need foam, likely sprayed in layers to get even R30 with 6".
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Old 04-05-2019, 08:52 PM   #3
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Re: R38 insulation in 2X6 joist.


Is this a ceiling with an open attic space above?
If so then r-19 would fill the cavity (R-23 if Roxul) and then another layer of r-19 perpendicular across the top of it.

What is the code requirement where you live?

Bud
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