Construction Design-Air Sealing Windows

I often hear during energy audits, complaints about windows.  Many homeowners feel the windows are cheaply made and replacement will result in substantial energy savings and an increase in comfort for the home.  Sometimes the windows are a major cause of comfort problems, more often, the window installation is the issue.  This blog post is about three different ways we air seal windows today.

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Building Science-Ice Dams

This year seems to be a good (or bad depending on how you look at it) year for ice dam problems in my area, the intensity of ice dams seems to change year to year.  I was recently on an ice dam diagnostic with an insulating contractor and a general contractor, the home was built in the early 1990’s and there is evidence there have been issues from the beginning.  We spent a couple hours testing this home, I’ll get into what we found in a bit.

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Building Science-Existing Construction Improvements

This three-part series first appeared on the Green Building Advisor website and has been condensed into one post.

An unconditioned and uninsulated crawlspace, an unsealed and uninsulated forced air heating system, and an uncovered dirt floor, which by the way has a sewage leak.  If this were your home and you wanted to make improvements, where would you start? Continue reading “Building Science-Existing Construction Improvements”

Construction Design-Insects and Rodents

When I purchased my old home, the 1952 Cape in late 2018, the basement area looked good.  Someone took the time to paint all the concrete walls and floor and cleaned everything up to look nice.  Shortly after we moved in, the cat caught a mouse and then the following summer, the basement became a bug gathering place.  Ants, spiders and other bugs apparently wintered in another area and returned to my house in the spring.

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Building Science-Three Way Buildings Leak Air

I have talked many times about blower door testing, air sealing and air leaks in this blog, on the Green Building Advisor’s website, and more recently, in the pages of Fine Homebuilding Magazine.  Most of what I’ve written deals with testing a home or techniques used in air sealing a home.  This time I’m going to discuss the mechanisms that cause air to leak, there are only three of them, but first a little science. Continue reading “Building Science-Three Way Buildings Leak Air”

Energy Audit-Calculating the Cost of a Home’s Air Leaks

Air leaking into a home (infiltration) or out of a home (exfiltration) happens naturally in every home, new or old.  No matter how much air sealing is performed, we just can’t make them completely air tight.  I’ve tested some new homes that were very tight, .33 ACH50, (anything under 1 ACH50 is very good) and I’ve also tested many older ones that aren’t so tight, we can use my 1952 Cape as an example, 9.71 ACH50.  In this post, I’m going to discuss how to manually calculate the cost of the air leakage and examine what we can do with that number. Continue reading “Energy Audit-Calculating the Cost of a Home’s Air Leaks”