The Latest from the Energy Vanguard Blog

Abundant pressure drops in flex duct installation
Posted by Allison Bailes on February 8, 2019
"Don't sweat the small stuff," they say.  You know what, though?  That may be great advice for your emotional life but it's terrible advice for just about anything to do with buildings.  Whether you're designing them, specifying materials, putting them together, or fixing them later, buildings have...
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Do convective loops in loose-fill fiberglass attic insulation cause it to lose up to half its R-value?
Posted by Allison Bailes on January 7, 2019
When you get into the world of building science, it's inevitable that you'll hear about the study that proved fiberglass insulation loses half its R-value because of convection within the insulation.  Or it could be you're a homeowner who's been told about this problem by an insulation contractor...
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loaa 2 insulation blown cellulose complete coverage energy vanguard
Posted by Allison Bailes on February 27, 2018
I love insulation. It's a wonderful thing because it saves energy. It makes buildings more comfortable. And it's pretty inexpensive considering how long it lasts (or should last). I get asked a lot for my opinion on the best insulation to put in a building and my answer is straightforward: A well-...
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Water vapor and cool surfaces are a bad combination
Posted by Allison Bailes on January 17, 2018
Because I've written so much about moisture in buildings, I get a lot of questions on the topic. Some are about walls. Some are about the attic. Some are about windows. Some are about the crawl space (which generates the most questions on this topic). The key to answering a lot of those questions...
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Is it better to go with exterior continuous insulation or thicker walls?
Posted by Allison Bailes on December 12, 2017
If you live in the world of 2x4 walls, as I do, you may have wondered about the savings you'd get by going to a more robust wall assembly. The typical house in southern climes has 2x4 walls with R-13 insulation in the cavities. Two ways to beef that up would be to add continuous exterior insulation...
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raised heel truss, photo by APA - The Engineered Wood Association
Posted by Allison Bailes on August 7, 2017
A comfortable, energy efficient home begins with a good building enclosure. That means control layers. You've got to control the flows of moisture, air, and heat. Today, let's talk about controlling heat and further, let's focus on heat going through the top of the house. If you've read my Flat or...
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Does compression of fiberglass insulation cause problems?
Posted by Allison Bailes on May 18, 2017
I've been guilty of perpetuating a myth. Last month I wrote an article in which I said installing insulation, "cavities are filled completely with as little compression as possible." But is compression really such a bad thing? When I posted that same article on Green Building Advisor, commenter...
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Blower door test during a home peformance assessment
Posted by Allison Bailes on May 17, 2017
Dick Kornbluth was an insulation contractor in Syracuse, New York back in the 1970s. Then he discovered home performance. It's really the logical place insulation contractors, HVAC contractors, and similar companies to end up. Rather than doing just one job to make a building better, he did several...
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Missed insulation and air barrier
Posted by Allison Bailes on May 16, 2017
The Atlanta housing market is booming again. I see renovations, infill, and tear-downs all over the place lately. There's a rebuild after tear-down happening now along one of my main walks. You saw a little about it already. Remember that house with the terrible joist blocking to the garage? Well,...
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Stick-built home with advanced framing
Posted by Allison Bailes on May 3, 2017
Most new homes in North America are built with sticks. The early home builders used bigger pieces of wood — timbers — and when the smaller dimensional lumber that we use so much today hit the market, they scoffingly referred to those new-fangled little woody things as sticks. So now our home...
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