Degree days are a combination of time and temperature. We looked at their uses and where they come from in part 1 of this series, and now it's time to go a little deeper. The temperature enters as a temperature…
The gap is narrowing. What gap, you ask? Why, the gap between stupid and hurt, of course. So says Dr. Joe Lstiburek. Allow me to explain. Sometimes when you do something stupid, it hurts immediately. A toddler touches a hot…
Dr. Joseph Lstiburek started it in 2012 when, in his keynote address at the Passive House conference, he said igloos were the first passive houses and you don't need WUFI,1 the hygrothermal modeling tool, to design and build a good…
I see a lot of interesting stuff at construction sites and in people's homes. I also see stuff I never got to see because people send me photos. I like photos! Remember that ice chest someone had incorporated into a…
Let's say you did some work on your home to make it more energy efficient - air sealing, more attic insulation, and a duct system retrofit. You've got your energy bills for 12 months before and 12 months after you…
Asbestos was a popular material for most of the twentieth century, mainly because of its ability to insulate and act as a fire retardant. In fact, it's still used heavily in some parts of the world, such as India and…
The photo above shows a common problem in new homes. It's also one that can make it difficult to pass the blower door test required by many building codes these days. If I tell you that the wall pictured here…
If you're building a house and want to have a really good building enclosure, you need it to be airtight, handle moisture properly, and have a good amount of insulation. Ideally, you'd also consider the effects of solar radiation on the…
Someone got creative with their attic insulation! Yes, those are foam peanuts and restaurant to-go boxes. Bill Box, a home inspector in our energy rater class this week, found this in an attic on a recent inspection he did. I…
A common misconception about the energy recovery ventilator (ERV) is that it's good for humid climates because it helps to dehumidify a home. It's usually the better choice for a humid climate when you're trying to decide between an ERV…