Knee Walls

Part 2 of Ceilings and Attics. Knee walls are vertical walls with attic space directly behind them. They are often found in houses with finished attics and dormer windows, such as in story-and-a-half designs. One approach to constructing an energy-efficient knee wall is to first air seal the knee wall using conventional techniques (i.e., seal […]

Read the rest this article free


Energy-Efficient Cathedral Ceilings

Part 1 of Ceilings and Attics. Cathedral ceilings must provide space between the roof deck and ceiling for adequate insulation and ventilation. For most areas of the U.S., the 1995 MEC recommends R-25 to R-38 insulation in a cathedral ceiling. This can be achieved through the use of truss joists, scissor truss framing, or sufficiently […]

Read the rest this article free