Building Envelope Testing
The 2009 International Energy Conservation Code requires that new duct systems be tested for air leakage and that the building envelope have an air leakage rate of not more than 7 Air Changes per Hour (@ 50 Pascals).
The building envelope may be tested with a blower door. This is clearly the best method to determine envelope leakage. The alternative is by visual observation which frankly cannot find air leaks.
All ducts must be sealed and either:
- Verified by pressure testing – the duct system has to be tested and the air leakage out of ducts must be kept to an acceptable maximum level.
- Installed entirely within the building thermal envelope – testing is not required if all ducts are inside the building thermal envelope (for example in heated basements), though the ducts still have to be sealed.
Give us a call to discuss your next project and how we can provide blower door and duct testing and air sealing consulting services.