Air and vapour barriers
What is a blower door test? What's the cost? How do you find a company to do one?
...air in from any existing hole in your air barrier no matter how small it is.
The operator then determines your ACH (air changes per hour) based on the house dimensions and the volume of air in the home. Standard new home construction in North America seems to return an average air leakage rate of about 3 air changes p...