Today’s project includes alterations to an existing non-residential building. According to Standards Section 141.0, an altered wood-framed wall is required to have a minimum of R-11 insulation between the framing members or the weighted average U-factor of the wall assembly not exceeding U-0.110. Altered windows in Climate Zone 11 are required to have a maximum 0.47 U-factor. The altered walls and windows in my project meet these requirements. When I run the prescriptive method calculation, I get two error messages: 1) The wood-framed wall must have a 0.045 U-factor and 2) The windows must have a 0.36 U-factor. These are the requirements for new construction. Should my building be able to comply using the values in Standards Section 141.0?
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