Blower Door Testing
The energy code has changed as of July 1, 2010 and now mandates every new residential dwelling must be tested for air leakage.
Builders can perform their own testing or they can contract it to an independent third party such as Northwest Infrared which has the equipment, experience, and insurance to complete this task properly.
Many builders have been constructing airtight homes for quite some time, and some have not. If you need guidance on how to build a tighter home, we can help.
State Energy Codes
Washington State Energy Code (WSEC) section 502.4.5 states that the test may be performed at any time after rough in.
All penetrations in the building envelope must be sealed including those for utilities, plumbing, electrical, ventilation and combustion appliances.
The code also states that when required by the building official, the test shall be conducted in the presence of department staff. An air leakage test is not required for additions less than 750 square feet.