The Latest from the Energy Vanguard Blog

I don't need no stinkin' Building Science Summer Camp!
Posted by Allison Bailes on July 22, 2013
Dr. Joe Lstiburek of Building Science Corporation is on a mission. The issue is residential ventilation. He contends that the residential ventilation standard, ASHRAE 62.2, ventilates at too high a rate, causing problems with humidity in hot or mixed humid climates, comfort and dryness in cold...
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radon vent rough in new home nashville epa
Posted by Allison Bailes on July 10, 2013
You can install a radon vent the hard way. Or you can install one the easy way. I discovered in Nashville a couple of weeks ago that home builders there prefer to do it the easy way. That is, they rough in the sub-slab or crawl space ventilation pipes during construction. Once they frame the house...
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resistance is futile residential ventilation wars
Posted by Allison Bailes on July 8, 2013
"ASHRAE 62 is the only national consensus standard document there is. Follow 62.2. Resistance is futile." So said Dr. Max Sherman last summer in a presentation for the Building America Technical Update meeting. (Download pdf official report here.) That statement about resistance being futile isn’t...
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spray foam insulation mechanical ventilation iaq indoor air quality
Posted by Allison Bailes on June 6, 2013
Spray foam insulation is an air barrier. When you use it instead of the fluffy stuff (fiberglass, cellulose, cotton), a house will be more airtight. That's good.
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attic bath fan duct snakes 440
Posted by Allison Bailes on May 17, 2013
Neville poked his head up through the scuttle hole into the attic and surveyed the situation. Troy immediately heard a scream erupt and had to get out of the way as Neville quickly jumped down off the ladder.
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moisture problem mold on floor joist in crawl space mechanical ventilation
Posted by Allison Bailes on February 4, 2013
I've written a couple of articles recently about the complexities of mechanical ventilation and the battles going on regarding when to install it, how much to ventilate, and whether ASHRAE 62.2 is worth all the resources we're throwing at it. (If you missed the debate between Michael Blasnik and...
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What's this HERS rating thing I keep hearing about?
Posted by Allison Bailes on February 1, 2013
With the help of people who know a lot more than I do, I'm slowly getting this stuff figured out. I wrote about my problems with using ACHnat a while back, and when I posted that article at Green Building Advisor (GBA) recently, Stuart Staniford wrote one of those comments that left me thinking,...
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ventilation standard ashrae 62 john krigger paul raymer building science fight club
Posted by Allison Bailes on January 18, 2013
I went to school with Cajuns in south Louisiana, and fights were a big deal. They happened frequently, and when they did, a small crowd would gather. The noise would grow quickly and soon everyone in the schoolyard would run over to where the fight was happening. One day in sixth grade, we...
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A bad duct retrofit
Posted by Allison Bailes on January 7, 2013
Heating and air conditioning contractors, like the rest of us, make mistakes. They make mistakes that hurt performance and efficiency of the HVAC systems they install and maintain. They make mistakes that hurt their customers sometimes. And they make mistakes that hurt their businesses. Let's look...
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indoor air quality iaq range hood ducted solar decathlon house glass
Posted by Allison Bailes on December 11, 2012
You'd never settle for a recirculating toilet, would you? Press the lever and everything in the bowl just swirls around and around. Never leaving, just recirculating. That's the image Professor John Straube painted for us last week in his talk at the Building Science Experts' Session. He was...
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