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<br /> <br /> <br /> <br /> <br /> <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 /> f. 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 /> It. The ceiling insulation alternative in Section 402.1.1.1 can be used as an equivalent <br /> alternative for R-30." <br /> <br /> (6) Amending Section 402.1.1. Section 402. 1.1 is amended by adding Section 402.1.1.1 to <br /> read: <br /> <br /> "402.1.1.1 Ceiling insulation alternative. When Table 402.1.1 requires R-30 for insulation <br /> of ceiling areas, the following alternate methods of insulation and construction are <br /> 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 board 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 area measured from the outside <br /> surface of the exterior walls. <br /> 2.3 GROSS AREA OF OPAQUE ROOF SURFACES. Gross area of opaque roof <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. Plans shall indicate insulation type, thickness, and location; ventilation opening types, <br /> sizes and locations; radiant barrier location; and roof surface type as appropriate, <br /> depending on the option selected from Subsection 1. <br /> 4. For compliance with Subsection 1.3, additional ventilation of the space containing a <br /> radiant barrier shall be provided by at least one of the following: <br /> 4.1. A baffled ridge vent installed in accordance with the manufacturer's <br /> instructions in addition to lower inlet openings to provide a total of no less than <br /> one square foot of net free vent area for each 300 square feet of roof area. No less <br /> <br /> <br /> <br /> <br /> 3 <br />