Exterior Insulation on 2×4 Walls Versus 2×6 Walls With Cavity Insulation Only

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Subtitle: 
A look at some modeling results may help you decide

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If you live in the world of 2×4 walls, as I do, you may have wondered about the savings you’d get by going to a more robust wall assembly. The typical house in southern climes has 2×4 walls with R-13 insulation in the cavities. The two ways to beef that up would be to add continuous exterior insulation or to go to a thicker wall. But which saves more energy? And how do they compare to the plain old 2×4 wall?

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Exterior Insulation on 2×4 Walls Versus 2×6 Walls With Cavity Insulation Only

Prime: 
prime

Subtitle: 
A look at some modeling results may help you decide

Images: 

If you live in the world of 2×4 walls, as I do, you may have wondered about the savings you’d get by going to a more robust wall assembly. The typical house in southern climes has 2×4 walls with R-13 insulation in the cavities. The two ways to beef that up would be to add continuous exterior insulation or to go to a thicker wall. But which saves more energy? And how do they compare to the plain old 2×4 wall?

read more

Two Rules for Humidity

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Subtitle: 
To prevent moisture damage from humid air, just do these two things

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Because I’ve written so much about moisture in buildings, I get a lot of questions on the topic. Some are about walls. Some are about the attic. Some are about windows. Some are about the crawl space (which generates the most questions on this topic).

The key to answering a lot of those questions boils down to an understanding of how water vapor interacts with materials. Once you know that, it’s easy to see the two rules for preventing damage from humidity.

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Two Rules for Humidity

Prime: 
prime

Subtitle: 
To prevent moisture damage from humid air, just do these two things

Images: 

Because I’ve written so much about moisture in buildings, I get a lot of questions on the topic. Some are about walls. Some are about the attic. Some are about windows. Some are about the crawl space (which generates the most questions on this topic).

The key to answering a lot of those questions boils down to an understanding of how water vapor interacts with materials. Once you know that, it’s easy to see the two rules for preventing damage from humidity.

read more

The Truth About Al Gore’s Carbon Footprint

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Subtitle: 
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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