The most recent blogs at Green Building Advisor

Here Come the Megacities

Posted on February 27, 2018 by John Vidal in Guest Blogs

Note: This post originally appeared at Ensia.

Urban Rustic: Air Sealing the Exterior Sheathing

Posted on February 26, 2018 by Eric Whetzel in Guest Blogs

Editor's note: This post is one of a series by Eric Whetzel about the design and construction of his house in Palatine, Illinois, a suburb of Chicago. The first blog in his series was called An Introduction to a New Passive House Project; a list of Eric's previous posts appears below. For more details, see Eric's blog, Kimchi & Kraut.

Looking Back at Insulating Advice from 1951

Posted on February 23, 2018 by Martin Holladay in Musings of an Energy Nerd

Up until the mid-1950s, almost every American carpenter had heard of Audels Carpenters and Builders Guide. Even carpenters who didn’t own all four volumes of the book series had probably studied the Audels books at some point in their careers, or knew someone on the job site who had copies of the books.

In a way, the Audels Guide was the Fine Homebuilding of the 1930s and 1940s. It instructed beginners in the right way to do things; it upheld standards; and it promoted quality work.

Installing Insulation With the X-Floc Ventilated Dry Injection System

Posted on February 22, 2018 by Peter Yost in Building Science

At the end of my recent blog on Kooltherm rigid phenolic foam insulation, I mentioned that the roof and wall assemblies at an energy retrofit project in Brattleboro, Vermont, were insulated with cellulose by a company called American Installations.

Are Traffic-Clogged Cities Ready for Congestion Pricing?

Posted on February 21, 2018 by John Rennie Short in Guest Blogs

New York is the latest city to contemplate congestion pricing as a way to deal with traffic problems. This strategy, which requires motorists to pay fees for driving into city centers during busy periods, is a rarity in urban public policy: a measure that works and is cost-effective.

Flatrock Passive: Blower Door Test Comes up Roses

Posted on February 20, 2018 by David Goodyear in Guest Blogs

Editor's Note: This is one of a series of blogs by David Goodyear describing the construction of his new home in Flatrock, Newfoundland, the first in the province built to the Passive HouseA residential building construction standard requiring very low levels of air leakage, very high levels of insulation, and windows with a very low U-factor. Developed in the early 1990s by Bo Adamson and Wolfgang Feist, the standard is now promoted by the Passivhaus Institut in Darmstadt, Germany. To meet the standard, a home must have an infiltration rate no greater than 0.60 AC/H @ 50 pascals, a maximum annual heating energy use of 15 kWh per square meter (4,755 Btu per square foot), a maximum annual cooling energy use of 15 kWh per square meter (1.39 kWh per square foot), and maximum source energy use for all purposes of 120 kWh per square meter (11.1 kWh per square foot). The standard recommends, but does not require, a maximum design heating load of 10 W per square meter and windows with a maximum U-factor of 0.14. The Passivhaus standard was developed for buildings in central and northern Europe; efforts are underway to clarify the best techniques to achieve the standard for buildings in hot climates. standard. The first installment of the GBAGreenBuildingAdvisor.com blog series was titled An Introduction to the Flatrock Passive House. For a list of Goodyear's earlier blogs on this site, see the "Related Articles" sidebar below; you'll find his complete blog here.

Planning for Backup Power in an All-Electric House

Posted on February 19, 2018 by Scott Gibson in Q&A Spotlight

Writing from central Kentucky, Clay Whitenack poses this question: in an all-electric house, what's the best way of providing power when the grid is down?

Whitenack and his family live in a new house, a house that does not have a fireplace or a wood stove. "This leaves us vulnerable in the event of a power outage during a bad winter," he writes in a post at the Q&A forum. "We live in central Kentucky, so the winters here are usually not too bad, but we do have times when the temps get below freezing for extended periods of time."

Using a Bath Fan to Equalize Room Temperatures

Posted on February 16, 2018 by Martin Holladay in Musings of an Energy Nerd

On Green Building Advisor, readers regularly ask questions about room-to-room temperature imbalances — the type of imbalances that may occur when a home has a point-source heater like a ductless minisplit or a wood stove. Here’s a typical question: “I’d like to install a bathroom fan to move air from a warm room to a cool room. Will this approach be enough to equalize the temperatures between the two rooms?”

Americans Are Saving Energy by Staying at Home

Posted on February 15, 2018 by Anonymous in Guest Blogs

By ASHOK SEKAR and ERIC WILLIAMS

Information and communication technologies are radically transforming modern lifestyles. They are redefining our concept of “space” by turning homes and coffee shops into workspaces. (This article was written in a coffee shop.) Instead of going to the theater, many people sit in the comfort of their homes and stream movies. Online purchasing of food, groceries, and consumer products has transformed shopping. Personal interactions, from the casual to the intimate, are increasingly virtual instead of face to face.

Is R-8 Duct Insulation Enough?

Posted on February 14, 2018 by Allison A. Bailes III, PhD in Building Science

If you know a little building science, you've no doubt seen a lot of problems that occur with air distribution systems. Ducts just don't get anywhere near the attention they deserve in most homes.

I've written about ducts quite a bit here and have shown problems resulting from poor design and installation. We all know how stupid some of those problems are. So today I'm going to talk about a problem that doesn't get nearly enough attention: duct insulation — even when the design and installation are perfect.

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