Huber Zip System sheathing

Subscribe via E-mail

Your email:

energy vanguard resnet combustion safety caz training hers rater

Loading

SF EnergyVanGuard Sept2014 WebAd

mastering building science online course box

energy vanguard blog off the chain

Energy Vanguard Blog

Current Articles | RSS Feed RSS Feed

The Fundamentals of Heating and Cooling Degree Days, Part 2

 
balance degree day base temperature

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 difference, ΔT (delta T), but it's not the ΔT between inside and outside of the building. It's the difference between the outdoor temperature and the base temperature. But what is this thing called base temperature?

The Gap Between Stupid and Hurt Is Narrowing

 
water catching roof austin texas

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.

The Experts Discuss Hygrothermal Analysis

 
joseph lstiburek bsc expert session wufi 2014 sml

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 house. Dr. Achilles Karagiozis, one of the leading proponents of WUFI, struck back in a presentation at the 2013 Westford Symposium on Building Science. In it he described a scenario in which Joe was in a helicopter crash in Alaska and had to build an igloo to survive. At the Passive House conference this year, Achilles expanded on that same topic.

2 Bad Ways to Install Windows the Hard Way

 
siding before window flashing kristof irwin

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 duct system? That was sent to me. So are the first two photos below.

The Fundamentals of Heating and Cooling Degree Days, Part 1

 
thermometer heating degree days

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 did the work, and now you want to see how much energy you saved. So you sit down with all 24 months worth of utility bills, convert everything to a common unit if you use more than one type of fuel, and take a look at the numbers. Unless, however, you take into account another important factor, you may be led to incorrect conclusions.

Passive House Builder Hammer & Hand Helps You Fight the Devil

 
crawl space new construction hammer and hand best practices manual

When I was building a home in 2001, I came across a gazillion little things that I needed guidance on. I'd never built anything larger than a bookcase, so new home construction was quite a big step. I bought books, scoured the web, and tried to get as much info out of Southface as I could, but I still couldn't find everything I needed. As a result, I made mistakes because, as you know, the devil is in the details.

How Much Should You Worry About Asbestos in the Home?

 
asbestos duct tape health safety risk

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 China. We know enough about the risks now, though, that it's banned outright in more than 50 countries according to asbestos.com and banned for some uses in the US. But how worried should you be if you find it in your home?

Building Enclosure Blunder in the Basement

 
sealed combustion closet unsealed floor joist duct

The photo below 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 separates two rooms in a basement and one of them is not conditioned, can you see the problem? If so, how many mistakes do you see here?

The Diminishing Returns of Adding More Insulation

 
blown cellulose insulation grade 1

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 home, but for now let's just focus on the insulation. What exactly is "a good amount" anyway?

Tags: 

Insulation to Go - Creativity in the Attic

 
attic insulation to go polystyrene boxes 1b

Someone got creative with their attic insulation!

All Posts
RESNET Logo home energy rating system 400  Energy Vanguard is a BPI Test Center logo vertical 200x275  Air Conditioning Contractors of America  Energy Vanguard is an ENERGY STAR Partner  efficiency first logo