Energy Vanguard Blog

4 Types of R-Value

Posted by Allison Bailes on Fri, Apr 29, 2016

We talk about R-value all the time. "I've got an R-19 wall," or "Code requires R-38 in my ceiling." But what are those numbers? As it turns out, when we talk about R-value we usually give the R-value of the insulation. That's the case with both of those statements above. But what's the real R-value of the wall or the ceiling? Insulation makes up only a part of each. There's also wood and drywall and sheathing and cladding and...

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Tags: insulation, heating & cooling

Foam Insulation and Global Warming, Part 3

Posted by Allison Bailes on Wed, Apr 20, 2016

Well, I really stirred things up with my last article on insulation and global warming. My intention was to explain why Alex Wilson's results could be doing a disservice to the green building community. In the end, I was rightly accused of have done a disservice myself. So, here goes with part three of my take on the global warming impact of insulation. Let's see if I can get closer to the truth this time.

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Tags: insulation, environment & sustainability

A Vivid Demonstration of the Benefit of Exterior Insulation

Posted by Allison Bailes on Mon, Apr 4, 2016

A couple of weeks ago I caught up with Anthony Cox at the Air Barrier Association conference in Baltimore. You may know Anthony as the inventor of the House of Pressure, a great model for demonstrating backdrafting, zonal pressure differences, and other building pressure phenomena. Well, now he's got a new toy and he brought it to Baltimore for the conference.

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Tags: insulation, moisture problems

Foam Insulation, Global Warming Potential, and BS

Posted by Allison Bailes on Tue, Mar 8, 2016

I've been reading a lot of BS lately. No, I'm not talking about blood sugar. It's brain science that's captured my attention. Understanding how the human brain works, why we do the things we do, and what common illusions often lead us astray. What I want to talk to you about today, though, is foam insulation and global warming, but first, we have to talk about calamari.

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Tags: insulation, spray foam, environment & sustainability

How to Get the Best Possible New Tract Home

Posted by Allison Bailes on Mon, Feb 15, 2016

Let's say you've bought a lot in a new development and are having a tract home built. You want the home to be as energy efficient, comfortable, and green as possible. Your builder offers only a few options, like high-efficiency heating and air conditioning systems, but you want more. That's the question I got from Kerry in North Carolina. Let's see what you can do to get the best possible result.

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Tags: insulation, crawl space, air leakage, attic, indoor air quality, health & safety

An Old Home in New Orleans Gets New Sheathing

Posted by Allison Bailes on Fri, Feb 5, 2016

New Orleans is the home of jazz, Mardi Gras, and rot. I grew up about 70 miles southwest of NOLA so I know a little something about the rain and the swamps and the muggy air. It makes it tough on buildings because the moisture comes from so many directions, but it is possible to control moisture there. Here's what we recommended for this hundred year old home that had its share of moisture problems.

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Tags: insulation, moisture problems

A Tale of Two Roofs - Frost, Snow, and Attic Heat Loss

Posted by Allison Bailes on Wed, Jan 27, 2016

It was the best of times, it was the worst of times, it was the season of cold, it was the season of heat, it was the ignorance of what was right in front of us, it was the opening of our eyes, we had warmth in our homes, we had warmth in our attics — in short, the period was so like the present period that indeed it is the present period, noisy authorities and superlative degrees of comparison aside.

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Tags: insulation, air leakage, attic, heating & cooling

My Top 10 Energy Efficiency Articles and Ideas of 2015

Posted by Allison Bailes on Tue, Dec 29, 2015

The year 2015 is almost finished. I've written 69 articles here in the Energy Vanguard Blog. I've been to a bunch of conferences and talked to a lot of people. A lot of thoughts about building science, energy efficiency, indoor air quality, and more have gone through my head. As I sit here at the end of the year looking back on all of it, here's what I see as the best and most interesting stuff I've written about.

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Tags: insulation, spray foam, water, moisture problems, solar energy, electricity

Are You Confusing Insulation with Air Barriers?

Posted by Allison Bailes on Tue, Nov 24, 2015

I read a lot of stuff online about insulation and air barriers and other building science topics. I see a fair number of articles bashing certain products or materials. Sometimes it's because the author sells a competing product. Sometimes they just don't like a product. Take fiberglass insulation, for example. What thoughts just went through your head?

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Tags: insulation, air leakage

Accidental Dehumidification - A Preventable Mess

Posted by Allison Bailes on Fri, Nov 20, 2015

"Oops! The house just had an accident. Whose turn is it to clean it up?" Yep. We're entering the season of accidental dehumidification. If you've got windows that start collecting water, like the one shown below, you're a victim of accidental dehumidification. It's not something you want in a building.

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Tags: insulation, air leakage, indoor air quality, water, moisture problems