air leakage testing

This paper presents results from whole building air leakage tests used to document the leakage reduction due to envelope sealing and assess the accuracy of contractor's estimates of the impact of their sealing. The measurements also compare the differences in envelope leakage reductions determined from depressurization versus pressurization tests and determine mechanical system leakage.

Describes elements of the 'Building America' initiative, a federally sponsored initiative that has as its goal to persuade production builders (100 plus homes a year) to build more energy efficient and durable homes. Some 'volume builders' in America build more than 20,000 homes a year. It is difficult to persuade buyers to invest in energy efficient homes. Many mechanical contractors fit two furnaces in unconditioned space, because duct runs are easier to install.