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WASHINGTON STATE ENERGY CODE <br />TABLE 6-2 <br />PRESCRIPTIVE REQUIREMENTS' FOR GROUP R OCCUPANCY <br />CLIMATE ZONE 1 • HEATING BY OTHER FUELS <br />Option <br />HVAC' <br />Equip. <br />Effic. <br />Glazing <br />Area": <br />% of <br />Floor <br />Glazin U-Factor <br />Door 10 <br />U-Factor <br />Ceiling <br />Vaulted <br />Ceiling <br />Wall <br />Above <br />Grade <br />Wall* <br />int' <br />Below <br />Grade <br />Wall* <br />exe <br />Below <br />Grade <br />Floors <br />Slab° <br />on <br />Grade <br />Vertical <br />Overheap <br />1. <br />Med. <br />10% <br />0.70 <br />0.68 <br />0.40 <br />R-30 <br />R-30 <br />R-15 <br />R-15 <br />R-10 <br />R-19 <br />R-10 <br />I1. <br />Mod. <br />12% <br />0.65 <br />0.68 <br />0.40 <br />R-30 <br />R-30 <br />R-15 <br />R-15 <br />R-10 <br />R-19 <br />R-10 <br />111. <br />Hi h <br />21% <br />0.75 <br />0.68 <br />0.40 <br />R-30 <br />R-30 <br />R-19 <br />R-19 <br />R-10 <br />R-19 <br />R-10 <br />IV.* <br />Med. <br />21% <br />0.65 <br />0.68 <br />0.40 <br />R-30 <br />R-3G <br />R-19 <br />R-19 <br />R-10 <br />R-19 <br />R-10 <br />V. <br />Low <br />21% <br />0.60 <br />0.68 <br />0.40 <br />R-30 <br />R-30 <br />R-19 <br />R-19 <br />R-10 <br />R-19 <br />R-lo <br />V1.' <br />Med. <br />25% <br />0.45' <br />0.68 <br />0.40 <br />R-39 <br />R-30 <br />R-19 <br />R-19 <br />R-10 <br />R-25 <br />R-10 <br />V11 7 <br />Mod. <br />30% <br />0.40' <br />0.68 <br />0.40 <br />R-30 <br />R-30 <br />R-19 <br />R-19 <br />R-!0 <br />R-25 <br />R-10 <br />Vlll. <br />Mod. <br />unlimited <br />0.25 <br />0.40 <br />0.40 <br />R-30 <br />R-30 <br />R-19 <br />R-19 <br />R-10 <br />R-25 <br />R-10 <br />• Reference Case <br />1. Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to th. conditioned <br />floor area of 19 %, it shall comply with all of the requirements of the 21 % glazing option (or higher). Proposed designs <br />which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this <br />Code. <br />2. Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed <br />Ceiling. <br />3. Requirement applicable only to single rafter or joist vaulted ceilings. <br />4. Below grade walls shall be insulated either on the exterior to a minimum level of R-10, or on the interior to the same <br />level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, <br />manufactured for its intended use, and installed according to tb^ manufacturer's specifications. See Section 602.2. <br />5. Floors over crawl spaces or exposed to ambient air conditions. <br />6. Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed <br />according to manufacturer's specifications. See Section 602.4. <br />7. The following options shall be applicable to buildings less than three stories: 0.50 maximum for glazing areas of 25 % <br />or less; 0.45 maximum for glazing areas of 30% or less. <br />8. This wall insulation requirement denotes R-19 wall cavity insulation plus R-5 foam sheathing. <br />9. Minimum HVAC equipment efficiency requirement. 'Low' denotes an AFUE of 0.74. 'Med.' denotes an AFUE of <br />0.78. 'High' denotes an AFUE of 0.88. Minimum HVAC equipment efficiency requirement for heat pumps. 'Low' <br />denotes an HSPF of 6.35. 'Med.' denotes an HSPF of 6.8. 'High' an HSPF of 7.7. Water and ground source heat <br />pumps shall be considered as medium efficiency and have a minimum COP as required in Table 5-7. <br />10. Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C or 10-61). <br />11. Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross <br />conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not <br />included in glazing area limitations. <br />12. Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5. <br />36 Effective 7/01/98 <br />