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The Water Cooler
General Discussion
Spray foam under roof decking.
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<blockquote data-quote="HoLeChit" data-source="post: 4058134" data-attributes="member: 35036"><p>My understanding is that in many instances when someone creates that “envelope” spray foaming the rafters and deck, by design you’re technically changing the design of the house. They won’t blow in insulation on top of your ceiling joists because now that the attic cannot be ventilated, it needs to be air conditioned/heated by your home HVAC system. Sealing it off with insulation just creates a stagnant, non ventilated space that will allow mold to grow. I’ve seen some newer houses with the foam insulation on the rafters/deck and they’re running a very oversized HVAC system to keep the attic cool too. Sometimes just as cool as the house.</p></blockquote><p></p>
[QUOTE="HoLeChit, post: 4058134, member: 35036"] My understanding is that in many instances when someone creates that “envelope” spray foaming the rafters and deck, by design you’re technically changing the design of the house. They won’t blow in insulation on top of your ceiling joists because now that the attic cannot be ventilated, it needs to be air conditioned/heated by your home HVAC system. Sealing it off with insulation just creates a stagnant, non ventilated space that will allow mold to grow. I’ve seen some newer houses with the foam insulation on the rafters/deck and they’re running a very oversized HVAC system to keep the attic cool too. Sometimes just as cool as the house. [/QUOTE]
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The Water Cooler
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Spray foam under roof decking.
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