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A1.2 Applicant-Determined Assembly U-Factors, C-Factors, F-Factors, or Heat Capacities
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If the building official determines that the proposed construction assembly is not adequately represented in Sections A2 through A8, the applicant shall determine appropriate values for the assembly using the assumptions in Section A9. An assembly is deemed to be adequately represented if
- the interior structure, hereafter referred to as the base assembly, for the class of construction is the same as described in Sections A2 through A8 and
- changes in exterior or interior surface building materials added to the base assembly do not increase or decrease the R-value by more than 2 from that indicated in the descriptions in Sections A2 through A8.
Insulation, including insulated sheathing, is not considered a building material.
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