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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 /> 3. Construction where the existing roof,wall or floor cavity is not exposed. <br /> 4. 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 /> c17 ' :/J <br />