Building Science-An Interview with Gary Nelson

I think most of us know of this man, one of the founders of The Energy Conservatory and designers of the Minneapolis Blower Door.  I recently had the opportunity to chat with Gary.  My intent with the interview is a little different from other interviews that have featured Mr. Nelson.   I wanted to ask questions from a practitioner working in the field point of view. Continue reading “Building Science-An Interview with Gary Nelson”

Energy Audit-Measuring for Blower Door Testing

Whether you are using equipment from Minneapolis Blower Door, Retrotec, or any other blower door manufacturer, one of the first steps in conducting a blower door test is to measure the home’s floor area, volume, and surface area.  Coming up with the floor area is the simplest, length times width.  Calculating volume also isn’t hard, width times length time height, simple right?  Not always, getting the volume of a geodome or a complex cathedral ceiling often takes some time. Continue reading “Energy Audit-Measuring for Blower Door Testing”

Energy Audit-Comparing a Great Blower Door Test to a Code Minimum Test

I recently blower door tested the tightest new home I have tested to date.  .82 air changes per hour at 50 pascals (ACH50), nearly one-quarter of the code required 3 ACH50 requirement.  After the test, the builder and I decided to open a window to see how much additional leakage it would take to get the home to the code minimum 3. Continue reading “Energy Audit-Comparing a Great Blower Door Test to a Code Minimum Test”

Construction Design-Simple Air Sealing Strategies

I built my first home for a customer back in 2000, I’ve learned a lot since then.  One of the areas I’ve learned the most is in building tightness.  These days I’m working more as an energy auditor.  Conducting code compliance blower door testing on new homes and conducting energy audits, some with blower door testing on older homes.  I get to see where homes leak. Continue reading “Construction Design-Simple Air Sealing Strategies”