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American Wood Council

For the total UA method, what are the mandatory minimum requirements? Can R values be lower than prescriptive?


R-values can be lower than prescriptive. In fact, that is the point of the UA method. The only mandatory minimum requirements are for the fenestrations, so they cannot be too inefficient.


The following FAQ is based on the presentation of BCD600 – Meeting Residential Energy Requirements with Wood-Frame Construction.

 
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