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8.1. To qualify for the radiant barrier credit (RB) described in Subsection 8, the <br />installation of the radiant barrier must meet the following criteria: <br />8.1.1. The emissivity of the radiant barrier must be 0.10 or less. The manufacturer <br />must provide test data or documentation of the emissivity as tested in accordance <br />with ASTM E-408. <br />8.1.2. The radiant barrier must be securely installed in a permanent manner using <br />one of the following installation methods: <br />8.1.2.1. The radiant barrier shall be draped with the shiny side facing down <br />over the top cord of the truss before the roof deck is installed. A minimum <br />air gap of/a inch must be provided between the radiant barrier and the roof <br />deck above at the center of the span. A minimum '/4 inch air gap must also <br />be provided between the radiant barrier and the ceiling or insulation below. <br />8.1.2.2. The radiant barrier shall be stretched with the shiny side facing <br />down between the top cords of the truss and stapled or otherwise secured at <br />each side. A minimum air space of/4 inch above and below is required. <br />8.1.2.3. For attic installations only, the radiant barrier shall be stapled or <br />otherwise secured to the bottom surface of the top cord of the truss and <br />draped below with the shiny side facing down. A minimum air space of/4 <br />inch above and below is required. <br />8.1.2.4. For open beam ceiling construction only, the radiant barrier shall <br />be laid on top of the roof deck with the shiny side facing up and a <br />minimum '/< inch air gap between the radiant barrier and the roofing <br />material above. The roof slope must be greater than or equal to 14° from <br />horizontal. <br />8.1.3. At least one square foot of free area for ventilation shall be provided per 150 <br />square feet of attic floor area, or in the case of vaulted or open-beam ceilings, per <br />150 square feet of ceiling area. In vaulted or open beam ceilings, the air space shall <br />be vented with vent area approximately evenly distributed between the top and the <br />bottom. In vaulted ceilings, vents shall be provided for each air space between <br />rafters." <br />(7) Amending Table 402.1.3. Footnote b is added to Table 402.1.3 to read: <br />"TABLE 402.1.3 EQUIVALENT U-FACTORS a <br />Climate Fenestration Skylight Ceiling Frame Wall Mass Floor' [3asement Crawl <br />Zone U-Factor U-Factor U-Factor U-Factor Wall U-Factor Wall Space <br /> U-Factor U-Factor Wall <br /> U-Factor <br />1 1.2 0.75 0.035 0.082 0.197 0.064 0.360 0.477 <br />2 0.75 0.75 0.035 0.082 0.165 0.064 0.360 0.477 <br />3 0.65 0.65 0.035 0.082 0.141 0.047 0.360 0.136 <br />4 except 0.40 0.60 0.030 0.082 0.141 0.047 0.059 0.065 <br />Marine <br />5 <br />