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Originally Posted by hayden55
How exactly do you know if you have adequate attic ventilation? I'm used to thinking about homes where the air changes per hour and humidity ranges have standards. Besides not seeing rusty nails or sweat on surfaces or mold it seems odd to talk about. Although, if you guys could see the houses they build in the south it pretty much shows they have no standards or inspections on attic ventilation.
This brings to mind one of the standards of one of the energy efficiency groups where they build house to have 1 air change per hour at 50 pascals of pressure. Which means the home is super efficient, it just needs humidity control, a hepa filter, and an air exchange system installed.
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There are rules of thumb for ratio of ventilation per attic area (not volume), like 1:150 or 1:300, split 50/50 between intake and exhaust.
I've read other rules of thumb too, like the attic temperature should not vary more than 20 degrees from outdoor.
Doesn't seem like builders actually do any math or stick to any standard of ventilation.