Should we ventilate?

How much should we ventilate?

Should we use and HRV/ERV?

Should the ventilation be balanced, negative or positive?

Are there any research projects on venting a conditioned attic?

Thanks is advance for opinions and data

Views: 143

Tags: Attic, Conditioned, Venting

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Comment by Franco Oyuela on November 12, 2018 at 3:31pm

Insulating and air sealing along the roof line offers several advantages over
insulating along the ceiling deck:

Energy Savings: An unvented atticis warmer in winter and cooler in summer,
reducing the HVAC load. The equipment will be more durable and more efficient, especially if ductwork is in the attic.

Moisture Resistance: The attic will stay dry, avoiding problems with mold and
wood rot, and thus can serve as living or storage space.

Disaster Resistance: Roofs over unvented attics are less likely to be blown off in high winds because the wind cannot readily enter the attic.

Comment by Jason Vandever on August 2, 2018 at 9:19am

Should you ventilate a sealed conditioned attic specifically? No.

How much you should ventilate will depend on a variety of factors. A few being square footage, number of occupants, lifestyle, indoor air quality, tightness of home...

If you live in Pittsburg CA an ERV would be the best but in a warm dry climate zone (you live in climate zone 3B) I'd likely opt for a smart continuous supply strategy (positive). Something like the QuFresh fan. Much less expensive to install and maintain but still very effective. An exhaust only strategy (negative) is the least desirable but allowable by code and the cheapest.

If you have combustion appliances in your home then care needs to be taken to account for those (backdraft, combustion air etc.). I'm assuming all electric.

Yes - https://buildingscience.com/documents/digests/bsd-102-understanding...

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