10/28/2026
What happens when you put all that airtightness detailing to the test?
For builder Dennis from Dennis Borren and his team, the preliminary blower door test was the first opportunity to measure how their approach was performing on this Element ICF Passive House.
And they hadn’t even finished all the back sealing yet.
The result? 0.4 air changes per hour (ACH)—meeting the project’s airtightness target at that stage of the build.
So what went into reaching that number, and what did Dennis learn from taking this Passive House from design to construction?
Watch the full video to hear Dennis walk through the results and lessons from the build.
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