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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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A difficult air sealing task with garage ceiling joists
Posted by Allison Bailes on May 2, 2017
The I-joists in the photo above run across the top of the wall between the dining room and the garage. In the old days, before anyone worried at all about air moving through those joist cavities, the builder didn't do anything with them. You can see here, though, that the builder knows a thing or...
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Air sealing the Build SMART wall panels with a sausage gun
Posted by Allison Bailes on May 1, 2017
Seven years ago Georgia led the nation. Yep. We were the first state to adopt an energy code that made blower door testing mandatory. All new homes built in the state had to show through performance testing that they had an air leakage rate of less than 7 air changes per hour at 50 Pascals of...
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spray-foam-insulation-roof-deck-cellulose-attic-floor.jpg
Posted by Allison Bailes on August 9, 2016
I get asked a lot of questions about spray foam. Do I need an ignition barrier? Should I use open cell or closed cell spray foam? Will open cell spray foam really rot my roof? But the question I get more than any other on this topic is about whether or not the insulation on the attic floor should...
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blower-door-test-master-bathroom.jpg
Posted by Allison Bailes on July 18, 2016
I've got a record of 14 blower door tests on my condo. Many of them were during home energy rater classes, as we'd bring them here for the confirmed rating they needed to complete. The early ones were horrible! But I had a good reason. Our laundry room ceiling was half gone because of a water leak...
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disconnected duct unbalanced supply leakage
Posted by Allison Bailes on June 30, 2016
A lot of discoveries and research work over the past four decades have led to our current understanding of air leakage in buildings. I’ll mention a few here, but I want to focus on one: the MAD AIR paper by John Tooley and Neil Moyer. The full title of the paper was, Mechanical Air Distribution And...
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interstitial-pressure-field-mad-air-leakage.jpg
Posted by Allison Bailes on May 25, 2016
The word "interstitial" comes up occasionally in building science discussions. I think I've heard it a couple of times at conferences just in the past month. That may be because Joe Lstiburek was there. He's the guy who used that word 127 times in his doctoral dissertation, Toward an Understanding...
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bathroom-remodel-exterior-wall-insulation.jpg
Posted by Allison Bailes on May 23, 2016
When I began remodeling my master bathroom last month, I found the exterior wall ripe for some serious improvement. It had a number of problems, and I was excited to find them. It was worse than I imagined in some ways. The photo below shows the wall partially opened up.
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air-barrier-continuity-leakage-sealing.jpg
Posted by Allison Bailes on May 3, 2016
Professor John Straube is one of the smartest guys in building science. On top of that, I think he's the best presenter in the field. At the Air Barrier Association conference in Baltimore, he gave one of the best building science talks I've heard. Of the things he said, this statement really stood...
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