Six years ago, RESNET published a major revision of the HERS Standards, called...wait for it: the 2006 National Mortgage Industry Home Energy Rating Systems Standards. One important new feature in the standards was the grading of insulation installation quality. Before…
The title of this article refers not to the two framers charging the house with a large timber but to the framing timbers already installed above the porch. Home designers, builders, and framers aren't used to thinking about the building…
Converting between temperatures on the Celsius and Fahrenheit scales is easy. I've been doing it in my head for over a decade now. Yeah, I know I'm a weirdo, using the metric system here in the US when no one…
If there's one building science topic that confuses more people in construction than any other, I think I'd say it's the purposes and properties of the various control layers. I'm talking about the materials that are meant to control the…
We want our homes to be airtight. It saves energy. It helps keep water vapor from getting into places where it can cause problems. It keeps bad air from moldy crawl spaces and contaminated garages out of the house. It…
Take a look at this first photo. If you've got any building science training at all, I really don't need to say anymore. Sure, I could fill you in on some of the details, but I'm betting you already know…
In our last home energy rater (HERS) training class, we saw something very interesting on one of our field visits. We were doing a Blower Door test on a new house, and one of the bedrooms upstairs had plastic taped…
Here's the thing. If you have anything to do with houses (home builder, remodeler, HERS rater, trade contractor, homeowner...), you probably ought to understand these three fundamental principles of air movement. Then you'll have a better chance of knowing how…
As I sit here on a nice cool May evening, getting ready for my trip to New England tomorrow, I'm thinking about sweat. And that makes me think about air conditioning. It may seem like it doesn't make sense, but…
We're making progress! With the all the emphasis on energy codes and energy efficiency programs like ENERGY STAR New Homes, more homes are getting Manual J heating and cooling load calculations these days. The intent is that the heating and…