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R503.1.1 Building envelope. Building envelope assemblies that are part of the alteration shall comply with Section R402.1.1 <br />or R402.1.4, Sections R402.2.1 through R402.2.11, R402.3.1, R402.3.2, R402.4.3 and R402.4.4. <br />Exception: The following alterations need not comply with the requirements for new construction provided the <br />energy use of the building is not increased: <br />1. Storm windows installed over existing fenestration. <br />2. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with <br />insulation. 2x4 framed walls shall be insulated to a minimum of R-15 and 2x6 framed walls shall be insulated to a <br />minimum of R-21. <br />Construction where the existing roof, wall or floor cavity is not exposed. <br />Roof recover. <br />5. Roofs without insulation in the cavity and where the sheathing or insulation is exposed during reroofing <br />shall be insulated either above or below the sheathing. <br />6. Surface -applied window film installed on existing single pane fenestration assemblies to reduce solar heat <br />gain provided the code does not require the glazing fenestration to be replaced. <br />R503.1.1.1 Replacement fenestration. Where some or all of an existing fenestration unit is replaced with a new fenestration <br />product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor <br />and SHGC in Table R402.1.1. Where more than one replacement fenestration unit is being installed, an area -weighted <br />average of the U-factor and SHGC of all replacement fenestration shall be permitted to be used to demonstrate compliance. <br />R503.1.2 Heating and cooling systems. New heating, cooling and duct systems that are part of the <br />alteration shall comply with Section R403. <br />Exceptions: <br />1. Where ducts from an existing heating and cooling system are extended, duct systems with less than 40 linear feet in <br />unconditioned spaces shall not be required to be tested in accordance with Section R403.2.2. <br />2. Existing duct systems constructed, insulated or sealed with asbestos. <br />R502.1.1.2 Heating and cooling systems. New heating, cooling and duct systems that are part of the addition shall comply <br />with Section R403. <br />Exception: The following need not comply with the testing requirements of Section R403.3.3: <br />1. Additions of less than 750 square feet. <br />2. Duct systems that are documented to have been previously sealed as confirmed through field verification <br />and diagnostic testing in accordance with procedures in WSU RS-33. <br />3. Ducts with less than 40 linear feet in unconditioned spaces. <br />4. Existing duct systems constructed, insulated or sealed with asbestos. <br />R503.1.3 Service hot water systems. New service hot water systems that are part of the alteration shall comply with Section <br />R403.5. <br />R503.1.4 Lighting. New lighting systems that are part of the alteration shall comply with Section R404.1. <br />Exception: Alterations that replace less than 50 percent of the luminaires in a space, provided that such <br />alterations do not increase the installed interior lighting power. <br />R503.2 Change in space conditioning. Any nonconditioned or low -energy space that is altered to become conditioned space <br />shall be required to be brought into full compliance with this code. <br />reiinit Jervice5 <br />