Washington Administrative Code

A102.1 General. Table A102.1 lists heat loss coefficients for the opaque portion of exterior ceilings below vented attics, vaulted ceilings and roof decks in units of Btu/h • ft2 • °F of ceiling.They are derived from procedures listed in the ASHRAE Fundamentals Handbook. Ceiling …

Table A102.1Default U-factors for Ceilings Standard FrameAdvanced FrameCeilings Below Vented Attics FlatBaffled R-190.0490.047 R-300.0360.032 R-380.0310.026 R-490.0270.020 R-600.0250.017Scissors Truss R-30 (4/12 roof pitch)0.0430.031 R-38 (4/12 roof pitch)0.0400.025 R-49 (4/12 ro…

A102.2 Component description. The four types of ceilings are characterized as follows:A102.2.1 Ceilings below a vented attic. Attic insulation is assumed to be blown-in, loose-fill fiberglass with a K-value of 2.6 h • ft2 • °F/Btu per inch. Full bag count for specified R-value is…

Table A102.2.4(1)Steel Trussa Framed Ceiling UoCavity Truss Span (ft) R-value12141618202224262830323436190.10750.09910.09280.08780.08390.08070.07800.07570.07370.07200.07060.06930.0681300.09070.08230.07600.07100.06710.06380.06120.05890.05690.05520.05380.05250.0513380.08440.07590.0…

Table A102.2.5Default U-factors for Metal Building Roofs Overall U-Factor for Assembly of Base Roof Plus ContinuousInsulation (uninterrupted by framing) Rated R-Value ofContinuous InsulationInsulationSystemRated R-Value ofInsulationOverall U-Factor for Entire Base RoofAssemblyR-6…

Table A102.2.6(1)Assembly U-factors for Roofs with Tapered Insulation Entirely Above Deck Single Slope Rectangular to One-sided,e,f,g,h(Uninterrupted by Framing) Rated R-value of Insulation at Maximum Condition (Rmaxc)151015202530354045505560Rated R-value of insulation at a Minim…

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61030, filed 2/1/13, effective 7/1/13.]

A103.1 General. The tables in this section list heat loss coefficients for the opaque portion of above-grade wood stud frame walls, metal stud frame walls and concrete masonry walls (Btu/h • ft2 • °F). They are derived from procedures listed in the ASHRAE Fundamentals Handbook. F…

A103.2 Framing description. For wood stud frame walls, three framing types are considered and defined as follows:A103.2.1 Standard. Studs framed on 16 inch centers with double top plate and single bottom plate. Corners use three studs and each opening is framed using two studs. H…

A103.3 Component description. Default coefficients for the following types of walls are listed: Single-stud walls, strap walls, double-stud walls, log walls, stress-skin panels, metal stud walls, and metal building walls.[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapte…

A103.3.1 Single-stud wall. Tables A103.3.1(1) through A103.3.1(8): Assumes either 2 x 4 or 2 x 6 studs framed on 16 or 24 inch centers. Headers are solid for 2 x 4 walls and double 2x for 2 x 6 walls, with either dead-air or rigid-board insulation in the remaining space.TABLE A10…

A103.3.2 Strap wall. Table A103.3.2: Assumes 2 x 6 studs framed on 16 or 24 inch centers. 2 x 3 or 2 x 4 strapping is run horizontally along the interior surface of the wall to provide additional space for insulation.Table A103.3.22 x 6: Strap Wall Siding Material/Frame Type Lapp…

A103.3.3 Double stud wall. Tables A103.3.3(1) and A103.3.3(2): Assumes an exterior structural wall and a separate interior, nonstructural wall. Insulation is placed in both wall cavities and in the space between the two walls. Stud spacing is assumed to be on 24 inch centers for …

A103.3.4 Log wall. U-factors for log walls shall be determined using ICC 400 Table 305.3.1.1, U-Factor of log wall (UW) by log thickness (WL) and specific gravity.[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11C-610334, f…

A103.3.5 Stress-skin panel. See Table A103.3.5.Table A103.3.5Stress Skin Panel PanelThickness,InchesU-factor NOTE: R-value of expanded polystyrene: R-3.85 per inchFraming: 6%Spline: 8% 3 1/20.071 5 1/20.048 7 1/40.037 9 1/40.030 11 1/40.025 No thermal bridging between interior an…

A103.3.6 Metal stud walls. The nominal R-values in Tables A103.3.6.1 through A103.3.6.3 may be used for purposes of calculating metal stud wall section U-factors in lieu of the ASHRAE zone calculation method as provided in Chapter 27 of the ASHRAE Fundamentals Handbook.A103.3.6.1…

A103.3.7 Concrete and masonry walls.A103.3.7.1 Concrete masonry walls. The nominal R-values in Table A103.3.7.1 may be used for purposes of calculating concrete masonry wall section U-factors in lieu of the ASHRAE isothermal planes calculation method as provided in Chapter 27 of …

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61040, filed 2/1/13, effective 7/1/13.]

A104.1 General. Table A104.1 lists heat loss coefficients for below-grade walls and floors.Coefficients for below-grade walls are given as U-factors (Btu/h • ft2 • °F of wall area). Coefficients for below-grade slabs are listed as F-factors (Btu/h • ft • °F per lineal foot of sla…

A104.2 Component description. All below-grade walls are assumed to be 8 inch concrete. The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade.Interior insulatio…

A104.3 Insulation description. Coefficients are listed for the following four configurations:1. Uninsulated: No insulation or interior finish.2. Interior insulation: Interior 2 x 4 insulated wall without a thermal break between concrete wall and slab.3. Interior insulation with t…

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61050, filed 2/1/13, effective 7/1/13.]

A105.1 General. Tables A105.1(1), A105.1(2) and A105.1(3) list heat loss coefficients for floors over unconditioned spaces in units of Btu/h • ft2 • °F.They are derived from procedures listed in the ASHRAE Fundamentals Handbook, assuming an average outdoor temperature of 45°F, an…

A105.2 Crawlspace description. Four configurations are considered: Naturally ventilated crawlspace, mechanically vented crawlspace, heated plenum crawlspace and exposed floor.A105.2.1 Naturally ventilated crawlspaces. Assumed to have 3.0 air changes per hour, with at least 1.0 ft…

A105.3 Construction description. Floors are assumed to be either joisted floors framed on 16 inch centers, or post and beam on 4 foot by 8 foot squares. Insulation is assumed to be installed under the subflooring between the joists or beams with no space between the insulation an…

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61060, filed 2/1/13, effective 7/1/13.]

A106.1 General. Table A106.1 lists heat loss coefficients for heated on-grade slab floors, in units of Btu/h • °F per lineal foot of perimeter.Table A106.1Default F-factors for On-Grade SlabsInsulation TypeR-0R-5R-10R-15R-20R-30 Unheated Slab Uninsulated slab0.73—————2 ft. Horizo…

A106.2 Component description. All on-grade slab floors are assumed to be 6 inch concrete poured directly onto the earth. The bottom of the slab is assumed to be at grade line. Monolithic and floating slabs are not differentiated.Soil is assumed to have a conductivity of 0.75 Btu/…

A106.3 Insulation description. Coefficients are provided for the following three configurations:1. Two foot (or four foot) vertical: Insulation is applied directly to the slab exterior, extending downward from the top of the slab to a depth of 2 feet (or 4 feet) below grade.2. Tw…

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61070, filed 2/1/13, effective 7/1/13.]

A107.1 Doors without NFRC certification. Doors that do not have NFRC certification shall be assigned the appropriate U-factor from Tables A107.1(1) through A107.1(4).[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61071, …

Table A107.1(1)Default U-factors for DoorsDoor TypeNoGlazedFenestrationSingleGlazingDoubleGlazingwith 1/4 in.AirspaceDoubleGlazingwith 1/2in.AirspaceDoubleGlazingwithe = 0.10,1/2 in.ArgonSwinging Doors (Rough opening - 38 in. x 82 in.)Slab Doors Wood slab in wood framea0.46 6% gl…

Table A107.1(2)Default U-factors for Revolving DoorsRevolving DoorsSize (W x H)U-Factor3-wing8 ft. x 7 ft.10 ft. x 8 ft.0.790.804-wing7 ft. x 6.5 ft.7 ft. x 7.5 ft.0.630.64Open82 in. x 84 in.1.32[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WS…

Table A107.1(3)Default U-factors for Steel Emergency DoorsDouble-skin Steel Emergency Exit DoorsCore Insulation3 ft. x 6 ft. 8 in.6 ft. x 6 ft. 8 in.1-3/8 in. thicknessHoneycomb kraft paperMineral wool, steel ribsPolyurethane foam0.570.440.340.520.360.281-3/4 in. thicknessHoneyco…

Table A107.1(4)Default U-factors for Steel Garage and Hangar DoorsDouble-skin Steel Garage and Aircraft Hangar Doors One-piece tilt-upaSectional tilt-upbAircraft hangarInsulatione8 ft. x 7 ft.16 ft. x 7 ft.9 ft. x 7 ft.72 ft. x 12 ft.c240 ft. x 50 ft.d1-3/8 in. thicknessXPS, stee…

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-61080, filed 2/1/13, effective 7/1/13.]

A108.1 General. Tables A108.1(1) and A108.1(2) list effective air change rates and heat capacities for heat loss due to infiltration for Single-Family Residential.The estimated seasonal average infiltration rate in air changes per hour (ACH) is given for standard air-leakage cont…

[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-70000, filed 2/1/13, effective 7/1/13.]

B101.1 Scope. The following default internal load values and schedules shall apply to Section C407.[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71010, filed 2/1/13, effective 7/1/13.]

B102 Default tables of internal loads. Default occupancy densities, receptacle power densities and service hot water consumption are included in Table B102.[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71020, filed 2/1/…

Table B102Acceptable Occupancy Densities, Receptacle Power Densitiesand Service Hot Water ConsumptionaBuilding TypeOccupancy Densityb ft2/Person (Btu/h • ft2)Receptacle Power Densityc, Watts/ft2 (Btu/h • ft2)Service Hot WaterQuantitiesd Btu/h per personAssembly50 (4.60)0.25 (0.85…

B103 Default schedules. Default schedules for occupancy, lighting, receptacles, HVAC, service hot water, and elevators are included in Tables B103(1) through B103(10).[Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. WSR 13-04-056, § 51-11C-71030,…

Table B103(1)Assembly Occupancya Schedule for OccupancySchedule for Lightingb/Receptacle Schedule for ServiceHot WaterSchedule forElevatorHour of Day (time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule for HVACSystemPercent ofMaximum LoadPercent ofMaximum Load WkSatSunWkSa…

Table B103(2)Health Occupancya Schedule for OccupancySchedule for Lightingb/Receptacle Schedule for ServiceHot WaterSchedule for ElevatorHour of Day(time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule for HVAC SystemPercent ofMaximum LoadPercent ofMaximum Load WkSatSunWkSat…

Table B103(3)Hotel/Motel Occupancya Schedule forOccupancySchedule for Lighting/Receptacle Schedule for ServiceHot WaterSchedule for ElevatorHour of Day(time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule for HVACSystemPercent ofMaximum LoadPercent ofMaximum Load WkSatSunWkS…

Table B103(4)Light Manufacturing Occupancya Schedule forOccupancySchedule for Lightingb/Receptacle Schedule for ServiceHot WaterSchedule for ElevatorHour of Day(time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule for HVAC SystemPercent ofMaximum LoadPercent ofMaximum Load W…

Table B103(5)Office Occupancya Schedule forOccupancySchedule for Lightingb/Receptacle Schedule for ServiceHot WaterSchedule for ElevatorHour of Day(time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule for HVACSystemPercent ofMaximum LoadPercent ofMaximum Load WkSatSunWkSatSu…

Table B103(6)Parking Garage OccupancyaHour of Day(time)Schedule forOccupancyPercent ofMaximum LoadSchedule forLightingb/ReceptaclePercent ofMaximum LoadSchedule forHVAC SystemSchedule forService Hot WaterPercent ofMaximum LoadSchedule forElevatorPercent ofMaximum Load WkSatSunWkS…

Table B103(7)Restaurant Occupancya Schedule forOccupancySchedule for Lightingb/Receptacle Schedule for Service Hot WaterSchedule for ElevatorHour of Day(time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule forHVAC SystemPercent ofMaximum LoadPercent ofMaximum Load WkSatSunWk…

Table B103(8)Retail Occupancya Schedule forOccupancySchedule forLightingb/Receptacle Schedule for Service Hot WaterSchedule forElevatorHour of Day (time)Percent ofMaximum LoadPercent ofMaximum LoadSchedule for HVAC SystemPercent ofMaximum LoadPercent ofMaximum Load WkSatSunWkSatS…