Thursday, September 21, 2017

Pete’s Product Puzzle: VersaDry

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Simple folded metal solves a common moisture problem
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I first “learned” about VersaDry when a colleague of mine here at BuildingGreen — our materials and product expert, Brent Ehrlich — sent me the photo reproduced at right. I was in the same boat you are right now: “OK, thanks for the photo, Brent, but what the hell is this VersaDry bent-metal thingamajig?”

He replied, “Oh, yeah, here is another photo that will help.” This time he sent me the photo reproduced as Image #2, below.

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from Building Science http://www.greenbuildingadvisor.com/blogs/dept/building-science/pete-s-product-puzzle-versadry

Wednesday, September 20, 2017

Thinking Clearly About the 3 Levels of the Building Enclosure

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Doing so can help you avoid scams, investigate failures, and maximize performance
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When you approach the subject of building science, especially regarding heat, air, and moisture flows through a building enclosure, it's easy to get confused. There's a lot to learn: blower door testing, insulation grading, R-value, vapor permeance, radiant barriers, combustion safety, solar heat gain coefficients, and on and on. That's why we break things down into simpler pieces.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/thinking-clearly-about-3-levels-building-enclosure

Wednesday, September 13, 2017

Is It Possible to Get Condensation on a Sponge?

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A little building science puzzler on moisture and the properties of materials
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I recently taught a class called What the Duct!? at the Builders' Boot Camp in Virginia. Paul Francisco was one of the other instructors (teaching about indoor air quality), and on the last evening at dinner, our conversation turned to building science. (Imagine that!)

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/it-possible-get-condensation-sponge

Wednesday, September 6, 2017

An Interesting Moisture Problem in a Trendy Restaurant

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Observations by astute diners give clues as to the source
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I've got the curse, you know. I can't walk into a building and not check out what's going on with ductwork, windows, and anything else that lets me apply what I know about building science.

Recently, I went to lunch at a trendy restaurant near Emory University and of course looked up at the ceiling. You can see what caught my attention in photo at right. The restaurant is only three or four years old, so I've been watching this problem get worse for a while now.

I have a few ideas about what's happening here. Do you?

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/interesting-moisture-problem-trendy-restaurant

Thursday, August 24, 2017

SonicLQ: Reconnecting Acoustics and Airtightness

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Early on in our work on energy-efficient homes, the connection between airtightness and sound centered on airport noise; now a new technology reconnects acoustics and air leakage
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Back in the early days of airport noise mitigation programs, there was a pretty strong link between air leakage and sound. A document titled “Tips for Insulating Your Home Against Aircraft Noise” noted, “Sound travels from the exterior to the interior of the home in two ways: through solid structural elements and through the air…. Wherever air can infiltrate a home, sound can as well.”

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from Building Science http://www.greenbuildingadvisor.com/blogs/dept/building-science/soniclq-reconnecting-acoustics-and-airtightness

Wednesday, August 23, 2017

The Truth About Al Gore’s Carbon Footprint

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Now that Gore’s new movie is showing in theaters, the attacks on his credibility have begun
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Al Gore is in the news again. His new climate change movie, An Inconvenient Sequel: Truth to Power, is in theaters now. And that means the folks who don't believe in climate change — or at least folks who don't believe that humans have any impact on it — are out in force trying to discredit the message.

As was the case 10 years ago when Gore’s original movie came out, they're going after his carbon footprintAmount of carbon dioxide and other greenhouse gases that a person, community, industry, or other entity contributes to the atmosphere through energy use, transportation, and other means. and making the case that he's a hypocrite. Let's take a look at the issues.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/truth-about-al-gore-s-carbon-footprint

Wednesday, August 16, 2017

The Joy of Flex

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A recap of my Building Science Summer Camp presentation
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I recently spoke at the Westford Symposium on Building Science. You may know it better as Building Science Summer Camp, since that's what everyone calls it. I'll fill you in on what you missed if you weren't there.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/joy-flex