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AF=Asx FAxF <br /> where: <br /> AF=Total glazing area <br /> A, =Standard reference design total glazing area. <br /> FA=(Above-grade thermal boundary gross wall area)/(above-grade boundary wall area+0.5 x below- <br /> grade boundary wall area). <br /> F=(Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area+common wall <br /> area)or 0.56,whichever is greater. <br /> and where: <br /> Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient <br /> conditions. <br /> Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil. <br /> Below-grade boundary wall is any thermal boundary wall in soil contact. <br /> Common wall area is the area of walls shared with an adjoining dwelling unit. <br /> L and CFA are in the same units. <br /> Unvented Attic Spaces.The attic space shall be permitted to be unvented when the design professional <br /> determines it would be beneficial to eliminate ventilation openings to reduce salt-laden air and maintain <br /> relative humidity 60 percent or lower to: <br /> (1) Avoid corrosion to steel components, <br /> (2) Avoid moisture condensation in the attic space,or <br /> (3) Minimize energy consumption for air conditioning or ventilation by maintaining satisfactory space <br /> conditions in both the attic and occupied space below." <br /> (42) A new section R407 is added to the International Energy Conservation Code to read <br /> as follows: <br /> "SECTION R407 <br /> POINTS OPTION <br /> R407.1 General (Prescriptive). Above-grade walls and roofs are permitted to <br /> comply with the points option as an alternative to complying with Sections R401.2.1, <br /> R402.1.2 and R402.2. <br /> R407.2 Requirements. One or more efficiency measures shall be selected for roof <br /> and above-grade wall systems from Table R407.1 that cumulatively equal or exceed 0 <br /> Lzero) points. As an alternative, above-grade walls and roofs are permitted to comply <br /> separately by scoring 0 (zero) or greater. <br /> 25 <br />