Here are the blower door results from one of the NJ Home Performance with Energy Star jobs we did this week.
In most houses we anticipate 30%-40% leakage reductions, which is generally considered pretty good. But 55% leakage reduction is pretty awesome! I’ll try to find time over the weekend to elaborate on our evolving techniques for sealing buildings.
Here’s the pre-work shot of the blower door manometer:
After work completion. (For geeks: The “config” settings are correct in both photos. Testing out required the use of the A ring, whereas testing in was done with the fan open. Also note that the manometer is in “CFM@50Pa”, so the 1.1 Pa difference on channel A results in a negligible difference in CFM.)