This article is 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 [...]
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This article is 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 [...]
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