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For SI: 1 foot = 304.8 mm. <br />a. R-values are minimums. U-factors and SHGC are maximums. R-19 shall be permitted <br />to be compressed into a 2 X 6 cavity. <br />b. The fenestration U-factor column excludes skylights. The SHGC column applies to all <br />glazed fenestration. <br />c. The first R-value applies to continuous insulation, the second to framing cavity <br />insulation; either insulation meets the requirement. <br />d. R-5 shall be added to the required slab edge R-values for heated slabs. <br />e. There are no SHGC requirements in the Marine zone. <br />£ Or insulation sufficient to fill the framing cavity, R-19 minimum. <br />g. "13+5" means R-13 cavity insulation plus R-5 insulated sheathing. If structural <br />sheathing covers 25 percent or less of the exterior, insulating sheathing is not required <br />where structural sheathing is used. If structural sheathing covers more than 25 percent of <br />exterior, structural sheathing shall be supplemented with insulated sheathing of at least R- <br />2. <br />h. The ceiling insulation alternative in Section 402.1.1.1 can be used as an equivalent <br />alternative for R-30." <br />(6) Amending Section 402.1.1. Section 402.1.1 is amended by adding Section 402.1.1.1 to <br />read: <br />"402.1.1.1 Ceiling insulation alternative. When Table 402.1.1 requires R-30 for <br />insulation of ceiling areas, the following alternate methods of insulation and construction <br />are acceptable: <br />1. The opaque portions of roof assemblies shall include at least one of the following: <br />1.1. R-19 insulation between roof or ceiling framing members; <br />1.2. Two inches of foam boazd insulation; <br />1.3. A radiant barrier as provided in Subsection 5 and ventilation as provided in <br />Subsection 4; <br />1.4. A cool roof as provided in Subsection 6 and a radiant barrier as provided in <br />Subsection 5; or <br />1.5. Roof heat gain factor is less than 0.05 when calculated in accordance with <br />Subsection 8. <br />2. For the purpose of this section, the following terms shall be defined as follows: <br />2.1. NET FREE VENT AREA. Net free vent area means the total area through <br />which air can pass in a screen, grille face or register. <br />2.2. ROOF AREA. Roof area means attic floor area; or, if there is no attic, "roof <br />area" means the horizontal projection of roof azea measured from the outside <br />surface of the exterior walls. <br />2.3 GROSS AREA OF OPAQUE ROOF SURFACES. Gross area of opaque root <br />surfaces means the total surface of the roof assembly exposed to outside air or <br />unconditioned spaces. The opaque roof assembly shall exclude skylight surfaces, <br />service openings, and overhangs. <br />3 <br />