Reviewed and Revised on 10/10/2013
Knee walls are found in houses with finished attics and multiple ceiling heights. The knee wall is the short wall that reaches from the sloped ceiling to the floor, or connects the upper ceiling to the lower ceiling inside the attic. Not only are air leaks common in these areas, but they are frequently not insulated properly.
Insulation itself does not stop air flow. For wall insulation to do its job, …
Reviewed and Revised on 11/12/2013
Air tries to equalize between higher and lower air pressure areas. If there is a pathway (a gap) and a pressure difference, it will move through that pathway whether we want it or not.
To be an effective air barrier or air flow retarder, a material must not only block airflow through it, it must also be installed in a way that eliminates even small gaps, be continuous all around the conditional space and …
Reviewed and Revised on 11/12/2013
Water vapor is one of the many gases that makes up the air we breathe. A little water vapor is good; too much is trouble.
An important term to understand moisture issues in a home is Relative Humidity (RH). Relative humidity is a measure of how much water vapor is in the air compared to how much it could hold at a given temperature. 100% RH means the air can’t hold any more water …
Reviewed and Revised on 01/03/2014
All kinds of homes- mobile, manufactured, modular, and factory-built, are built in a factory. The difference lies in how much construction occurs at the factory and how much assembly occurs at the actual home site. When more work is done at the factory, less labor and work is needed at the home location. Energy efficiency issues and solutions for all these homes could be similar or vary depending upon the construction process and other issues. …
