Choosing the Best High Performance Wall System
Jesse Lizer has done his homework. The three potential wall systems, which he outlines in a post at GreenBuildingAdvisor, all have slightly different R-values and slightly different material costs. His research leads him to believe that a double 2×4 wall insulated with dense-pack cellulose is the most bang for the buck should he want an R-value of 40 or more.
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Two of his options include 2×6 walls, also insulated with cellulose, and exterior rigid foam. Using foam over exterior sheathing makes construction somewhat more complicated, expecially when it comes to adding doors and windows.
But foam also has some advantages. One of them is keeping the sheathing and framing warmer, thereby helping to reducing the risk of moisture accumulation and rot.
Weighing the options is the subject of this week’s Q&A Spotlight.