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Are OSB and plywood considered wood so the R values can be summed?


Yes, R values can be summed for OSB and plywood. Values are shown in Design for Code Acecptance 7 -  Meeting Residential Energy Requirements with Wood-Frame Construction - 2012 IECC Version. 


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

  • Are OSB and plywood considered wood so the R values can be summed?

  • Does the term fenestration include windows and doors? Does "opaque" include walls and doors?

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

  • Is there any credit for a radiant barrier when calculating U-factors?

  • Does the Energy UA Calculator have 7/16 OSB?

  • How can I meet residential energy requirements with wood-frame construction?

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