Wednesday, October 18, 2017

An Easy Retrofit for Return Air

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For homes without dedicated return grilles in the bedrooms, this easy-to-install device provides a return air pathway
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Your bedroom really doesn't aspire to be a balloon. Yet, because of the way your heating and air conditioning system was installed, it may be acting like one. At least to an extent. It doesn't expand the way a balloon does, but it does get blown up.

Think about it. If your bedroom has a supply register from your HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. system but no return grille or other pathway for the air to make its way back to the unit, what happens to that air blowing into the room when you close the door?

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/easy-retrofit-return-air

Wednesday, October 11, 2017

Four Sources of Crawl Space Moisture

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To stop moisture problems in vented crawl spaces, you have to know where the moisture comes from
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Here in the southeastern U.S., we have a lot of crawl spaces. Most are vented. Even most new ones are vented. It's not because it's the best way to keep them dry. That's certainly not true. We have enough research on crawl spaces to know better. No, they're vented because foundation vents got into the code decades ago and, once there, they’ve been difficult to dislodge.

So if you have a vented crawl space, especially in a humid climate, it most likely has moisture problems. And where does that moisture come from? Let's take a look.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/four-sources-crawl-space-moisture

Wednesday, October 4, 2017

The Difficulties of Third-Party HVAC Design

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How do we get everyone on the same page?
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What if a builder refused to build from plans drawn by an architect? What if a tile installer refused to implement designs handed to them and instead did their own thing? What if an HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. contractor told a potential client they wouldn't install a system designed by a third party to ACCA protocols?

One of those questions is more real than the others. Of course builders build from architects' plans and tile installers don't throw out designs they're asked to implement. But third-party HVAC design is a different animal.

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from Building Science http://www.greenbuildingadvisor.com/articles/dept/building-science/difficulties-third-party-hvac-design

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