The Importance of Mechanical Ventilation During most presentations we give about air sealing and infiltration, like clockwork someone will ask, “but doesn’t the house need to breathe, aren’t we making buildings too tight?” This is a popular green building myth, but people need to breathe, walls don’t. In fact buildings perform best when they’re […]
Author Archive for: Andrea Foss
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Entries by Andrea Foss
Properly Sizing Mechanical Systems in Multifamily Buildings Multifamily buildings can be a unique challenge when it comes to selecting effective heating and cooling systems. In the Washington, DC region’s mixed-humid climate, humidity control becomes a central challenge because of a couple inescapable realities. There is a lot of moisture added per square foot from cooking, […]
Blower Door Testing to Measure Air Leaks Every home has air leaks, but the cumulative amount of leaks can vary widely based on the air sealing efforts. Infiltration and air sealing basics are covered in part 1 of this post. To measure the amount of leakage in a home we use a tool called a blower […]
What is Infiltration? Infiltration is outside air entering and leaving the house, taking conditioned air with it. A lot of people are surprised by the above photo, assuming air leaks happen predominately around windows and doors. In actuality air is driven through our homes by the stack effect – warm air rising. This means the […]