If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2. If structural sheathing covers 25 percent or less of the exterior, R-5 sheathing is not required where structural sheathing is used. (e) "13 + 5" means R-13 cavity insulation plus R-5 insulated sheathing. (d) Or insulation sufficient to fill the framing cavity, R-19 minimum. (c) R-5 shall be added to the required slab edge R-values for heated slabs. (b) The fenestration U-factor column excludes skylights. R-19 shall be permitted to be compressed into a 2圆 cavity. Insulation and Fenestration Requirements by Component (a) IRC Table N1102.1 is deleted in its entirety and replaced with the following: Table N1102.1 The thermal performance must be measured in accordance with the ASTM C236 test procedure for thermal transmittance measurement performed by an approved laboratory as defined in Minnesota Rules, chapter 7640. The thermal performance must be calculated in accordance with ASHRAE Handbook of Fundamentals isotherm planes calculation method certified by a professional engineer registered in Minnesota.Ģ. The thermal performance of a foundation insulation system that is not continuous or a concrete masonry block wall assembly with integral insulation must be determined by paragraph 1 or 2, and must exclude air film coefficients and the R-value of the surrounding soil.ġ. Computed R-values shall not include an R-value for other building materials or air films. The manufacturer's settled R-value shall be used for blown insulation. Insulation material used in layers, such as framing cavity insulation and insulating sheathing, shall be summed to compute the component R-value. IRC Section N1102.1.1 is amended to read as follows:
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