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Old 10-19-2011, 11:43 PM   #1
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cape cod side attics

Can you insulate both the roof in the side attic if you baffle it and the kneewall going the entire length or no? I have been told multiple answers. There is a soffit that is vented the whole length and a ridge vent at the top of the roof. In NY.


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Old 10-23-2011, 01:35 AM   #2
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I don't quite follow exactly what your situation is, but you are welcome to insulate wherever you want to, as long as it is ventilated on the outside (spray foam against a roof is an exception). More importantly, air seal on the conditioned side (heated side) before you insulate. Stopping air is A#1, then insulate.


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Old 10-23-2011, 09:04 AM   #3
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Insulation layer and air barrier need to line up and occupy the same plane.

In this case, if you have eave venting (soffits) your air barrier should be on the kneewalls as well as your insulation layer.
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