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Old 07-21-2018, 12:41 PM   #1
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Rigid Foamboard For Insulating Between Rafters


Are air baffles requited if installing 2" rigid foam between 2X4 rafters?
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Old 07-21-2018, 02:02 PM   #2
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Re: Rigid Foamboard For Insulating Between Rafters


Is this an attic? Normally rafters are not insulated, but the ceiling joist bays are. Attic temperatures are to remain as close to outside temperature as possible. Is this in a house or a garage/shop building? Pictures always help.
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Old 07-21-2018, 06:43 PM   #3
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Re: Rigid Foamboard For Insulating Between Rafters


A few other questions in addition to Chandlers great questions, what's your location?
Main reason I ask is just R10 of insulation is not likely to be enough.
https://www.energystar.gov/index.cfm...sulation_table
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Old 07-23-2018, 07:59 PM   #4
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Re: Rigid Foamboard For Insulating Between Rafters


I think it depends on the type of roofing you built for your home? If it is metal then you need foam insulation with aluminum
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