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Building Envelope

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The building envelope is the separation between the interior and exterior environment of a building, consisting of the roof, doors, windows, foundation, and walls. Think of it as a building package because it contains more than just the roof.

“You’ll often hear experts talking about the tightness of a building’s envelope. Really they’re just talking about energy leakage here, so the tighter the envelope is, the less homeowners will spend on heating and cooling.”

Blower Door Tests

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Blower door tests measure the air tightness of a building and determine the home’s air infiltration rate. How it works: A certified auditor mounts a powerful fan onto an exterior door. The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then sneaks back into the house through all of the unsealed cracks and openings. It’s important that auditors use a calibrated door for this process. The calibrated blower door’s data allows the auditor to quantify the effectiveness of any air-sealing job by the amount of air leakage. That leakage is measured by the amount of air it takes (in cubic feet per minute) to change the air pressure in the house by 50 Pascals, or cfm50. A good rule of thumb is that your house should have a cfm50 equal to or less than its square footage.

 

Glossary of Green Terms

Here is a glossary of green terms. You may be familiar with some of these, and some might be something you have never heard of before! Throughout this site, there are home and property options listed that are growing in popularity. To find out more about them, you can browse through this handy section.
Enjoy!

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Hydro, Hydropower or Hydroelectric Power (HEP)

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(HEP) Hydro, Hydropower or Hydroelectric Power
Energy in moving water can be harnessed and used to generate electricity. Since water is about a thousand times denser than air, even a slow flowing stream of water, or moderate sea swell, can yield considerable amounts of energy. There are many ways energy can be harnessed from of water including tidal power, waver power and hydro. Hydroelectric power is a term often reserved for large-scale hydroelectric dams, which can have a mixed effect on the environment if not well located; small-scale hydropower can include the conversion of old mill streams to generate electricity.