This is most often done with spray polyurethane foam spf insulation either open cell or closed cell.
Energyvanguard power attic.
Power attic ventilators banned by new georgia energy code.
There s a new boss in town.
For decades concerned homeowners have looked for ways to keep their attics cool.
Whether you re a home or business owner we can help.
Power attic ventilators can cause problems even without air conditioning.
An attic that s brought inside the building enclosure is a beautiful thing.
Energy vanguard this powered attic ventilator in a gable wall was one of eight in that attic.
Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing.
They re going after the air but the air is hot only because all the solid materials are hot.
These are real problems from real houses that have really happened.
That s one reason power attic ventilators aren t a good solution.
And it s part of the reason that my state georgia has banned power attic ventilators unless they re solar powered which was a concession needed to get the grid powered fans banned.
Gable vents ridge vents turtlebacks and whirlybirds.
They ve been well discussed here and other places but briefly they re not cost effective don t deal with the problem where it starts are using convection to solve a radiant heat problem and can even be dangerous by backdrafting combustion appliances and putting carbon monoxide in the home.
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The new energy code that went into effect in georgia this year dealt a body blow to the power attic ventilator industry.
One potential problem would be sucking moist moldy air up from the crawl space intothe house.
Only one type is allowed.
Another would be backdrafting a water heater and putting carbon monoxide in the house.
Attic power ventilators are simply not worth the cost and effort.
Here in the southeastern us open cell is most often the spray foam of choice.
In fact the home power article states that a typical 250 watt fan would use 180 kwh per month if run continuously.
But there s really a more fundamental reason that power attic ventilators won t help a lot and for some reason i didn t mention that in the original article.
Now we don t have to settle for a technology that pulls conditioned air up from the house.
Then they moved from passive to active and latched onto the powered attic ventilator.
Powered attic ventilators are the worst way to try to keep your attic cool.
