We're working on a project, so we got a set of plans to get started. It includes the attic kneewall and vaulted ceiling section you see below.This is typical of plans that architects draw, and builders build houses this way…
Spray foam insulation is an air barrier. When you use it instead of the fluffy stuff (fiberglass, cellulose, cotton), a house will be more airtight. That's good. Spray foam insulation is an air barrier. When you use it instead of…
Spray foam insulation evokes some interesting conversation among building science professionals, those in construction, environmentalists, and homeowners who have it in their homes. Many think it solves all problems, no matter how poorly it's installed. Some think it's helping to…
After reading an article by Joe Lstiburek titled Just Right and Airtight, I got to thinking about what we've been spending a lot of time on lately, and that is what we call the “New Big Holes.” Of the 350+…
I get asked a lot of questions about windows, air conditioning, and other energy efficiency topics: What size HVAC system should I install? Is it true you can seal a house up too tight? Can I use a CFL bulb…
I'm teaching a HERS rater class this week, and on Monday we went out to look at a couple of houses and do a Blower Door test. The second house we visited was under construction, and the builder had used…
Putting spray foam insulation on the roofline of both existing homes and new homes has been growing in popularity over the past decade. But, is it always the best way to treat the building envelope? When does it make sense…
If you read my article last week, you know that most insulation materials don't stop infiltration, although it's commonly believed that adding insulation is the solution to a drafty house. That's only one of many limitations you need to be…
Yesterday we began our latest HERS rater class, training a new group of home energy raters. We have 11 students this time, mostly from Georgia but also one from Virginia and one from Tennessee. We spent the first half of…
Last week, I did my first webinar. Along with Jason Payne of Structured Energies and EEM Training, I discussed the Energy Efficient Mortgage (EEM), theory and application. I handled the theory side, and Jason, who's actually done a bunch of…