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Table R402.1.1 Footnotes <br />For SI: 1 foot .= 304.8 mm, ci .= continuous insulation, int .= intermediate framing. <br />a R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity <br />which is less than the label or design thickness of the insulation, the compressed R-value of the insulation <br />from Appendix Table A101.4 shall not be less than the R-value specified in the table. <br />b The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed <br />fenestration. <br />c "10/15/21.+TB" means R-10 continuous insulation on the exterior of the wall, or R-15 on the continuous <br />insulation on the interior of the wall, or R-21 cavity insulation plus a thermal break between the slab and <br />the basement wall at the interior of the basement wall. "10/15/21.+TB" shall be permitted to be met <br />with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the <br />interior or exterior of the wall. "10/13" means R-10 continuous insulation on the interior or exterior of <br />the home or R-13 cavity insulation at the interior of the basement wall. "TB" means thermal break <br />between floor slab and basement wall. <br />d R-10 continuous insulation is required under heated slab on grade floors. See R402.2.9.1. <br />e There are no SHGC requirements in the Marine Zone. <br />f Reserved. <br />g Reserved. <br />h Reserved. <br />i The second R-value applies when more than half the insulation is on the interior of the mass wall. <br />j Reserved. <br />k For single rafter- or joist -vaulted ceilings, the insulation may be reduced to R-38. <br />[Reserved. <br />m Int. (intermediate framing) denotes standard framing 16 inches on center with headers insulated with <br />a minimum of R-10 insulation. <br />Table R402.1.3 Footnote <br />a Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source or <br />as specified in Section R402.1.3. <br />