Insulating knee walls


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Old 10-18-15, 04:45 PM
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Insulating knee walls

Any thoughts on insulating knee walls as opposed to rafters from floor to ceiling during attic remodel? I know it would be cheaper but are there any cons to this?
 
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Old 10-18-15, 05:19 PM
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To insulate the rafters you also need to insulate the end walls and install baffles or other material to extend the soffit venting all the way to the attic above.

One of the drawbacks is, that side attics may still get cold enough to result in moisture issues so steps need to be taken to allow that space to share the heat and air flow from the main living space. Basically, you need to keep the inside surface of the drywall on the bottom of the rafters above the dew point. And note, those rafters will need a rigid air tight air barrier to prevent moist air from reaching the bottom of the roof sheathing.

Unless you absolutely need that space for storage, it is easier to insulate the floor and back of the kneewall, plus an air block below the kneewall, than to reach code level insulation in the rafters with the sheetrock.

Bud
 
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Old 10-18-15, 07:19 PM
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What would an air block consist of?
 
 

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