Last Update: 8/23/17

Chapter 51-11C WAC


WAC Sections

Chapter 1 CEScope and administration.
Section C101Scope and general requirements.
Section C101.4Applicability.
Section C101.5Compliance.
Section C102Alternate materialsMethod of construction, design or insulating systems.
Section C103Construction documents.
Section C104Inspections.
Section C105Validity.
Section C106Referenced standards.
Section C107Fees.
Section C108Stop work order.
Section C109Board of appeals.
Section C110Violations.
Section C111Liability.
Chapter 2 CEDefinitions.
Section C201General.
Section C202General definitions.
Section C202.1A.
Section C202.2B.
Section C202.3C.
Section C202.4D.
Section C202.5E.
Section C202.6F.
Section C202.7G.
Section C202.8H.
Section C202.9I.
Section C202.10J.
Section C202.11K.
Section C202.12L.
Section C202.13M.
Section C202.14N.
Section C202.15O.
Section C202.16P.
Section C202.17Q.
Section C202.18R.
Section C202.19S.
Section C202.20T.
Section C202.21U.
Section C202.22V.
Section C202.23W.
Section C202.24X, Y, Z.
Chapter 3 CEGeneral requirements.
Section C301Climate zones.
Section C302Design conditions.
Section C303Materials, systems and equipment.
Section 303.1Identification.
Table C303.1.3(1)Default glazed fenestration U-factors.
Table C303.1.3(2)Default door U-factors.
Table C303.1.3(3)Default glazed fenestration SHGC and VT.
Table C303.1.3(4)Default U-factors for skylights.
Table C303.1.3(5)Small business compliance default table.
Section C303.2Installation.
Section C303.3Maintenance information.
Chapter 4 CECommercial energy efficiency.
Section C401General.
Section C402Building envelope requirements.
Section C402.1General (Prescriptive).
Section C402.1.1Low energy buildings.
Section C402.1.2Equipment buildings.
Table C402.1.3Opaque thermal envelope assembly R-value requirements.
Section C402.1.3Insulation component R-value method.
Section C402.1.4Assembly U-factor, C-factor, or F-factor-based method.
Table C402.1.4Opaque thermal envelope requirements, U-factor method.
Table C402.1.4.1Effective R-values for steel stud wall assemblies.
Section C402.1.5Component performance alternative.
Section C402.2Specific insulation requirements.
Section C402.2.1Multiple layers of continuous insulation.
Section C402.2.2Roof assembly.
Section C402.2.3Above-grade walls.
Section C402.2.4Below-grade walls.
Section C402.2.5Floors.
Section C402.2.6Slab-on-grade perimeter insulation.
Section C402.2.8Insulation of radiant heating systems.
Section C402.4Fenestration (Prescriptive).
Table C402.4Building envelope requirementsFenestration.
Section C402.4.1Maximum area.
Section C402.4.2Minimum skylight fenestration area.
Section C402.4.3Maximum U-factor and SHGC.
Section C402.4.4Doors.
Section C402.5Air leakage-thermal envelope.
Section C402.5.1Air barriers.
Section C402.5.3Rooms containing fuel-burning appliances.
Section C402.5.4Doors and access openings.
Section C402.5.5Air intakes, exhaust openings, stairways and shafts.
Section C402.5.6Loading dock weatherseals.
Section C402.5.7Vestibules.
Section C402.5.8Recessed lighting.
Section C403Mechanical systems.
Section C403.1General.
Section C403.2Provisions applicable to all mechanical systems.
Section C403.2.1Calculation of heating and cooling loads.
Section C403.2.2Equipment and systems sizing.
Section C403.2.3HVAC equipment performance requirements.
Table C403.2.3(1)Minimum efficiency requirementsElectrically operated unitary air conditioners and condensing units.
Table C403.2.3(2)Minimum efficiency requirementsElectrically operated unitary and applied heat pumps.
Table C403.2.3(3)Minimum efficiency requirementsElectrically operated PTAC, PTHP, SPVAC, SPVHP, room air conditioners.
Table C403.2.3(4)Minimum efficiency requirementsWarm air furnaces and unit heaters.
Table C403.2.3(5)Minimum efficiency requirementsGas- and oil-fired boilers.
Table C403.2.3(6)Reserved.
Table C403.2.3(7)Minimum efficiency requirementsWater chilling packages.
Table C403.2.3(8)Minimum efficiency requirementsHeat rejection equipment.
Table C403.2.3(9) and Table C403.2.3(10)Minimum efficiency requirements.
Section C403.2.4HVAC system controls.
Section C403.2.4.1Thermostatic controls.
Section C403.2.4.2Off-hour controls.
Section C403.2.4.3Shutoff dampers.
Section C403.2.4.4Zone isolation.
Section C403.2.4.5Snowmelt and freeze protection controls.
Section C403.2.4.7Economizer fault detection and Section C403.2.4.8Combustion heating equipment controls.
Sections C403.2.4.9 through C403.2.4.11Group R controls.
Section C403.2.4.12Direct digital control systems.
Section C403.2.5Hot water boiler controls.
Section C403.2.6Ventilation.
Section C403.2.6.2Demand control ventilation.
Section C403.2.6.3Occupancy sensors.
Section C403.2.6.4Loading dock and parking garage ventilation system controls.
Section C403.2.7Exhaust systems.
Section C403.2.8Duct and plenum insulation and sealing.
Section C403.2.9Piping insulation.
Table C403.2.9Minimum pipe insulation thickness.
Section C403.2.10Mechanical system commissioning and completion requirements.
Section C403.2.11Air system design and control.
Tables for Section C403.2.11.
Section C403.2.12Heating outside a building.
Section C403.2.13System criteria.
Section C403.2.14Electric motor efficiency.
Section C403.3Economizers.
Section C403.3.1Integrated economizer control.
Section C403.3.2Economizer heating system impact.
Section C403.3.3Air economizers.
Section C403.3.4Water-side economizers.
Section C403.4Hydronic and multiple-zone HVAC systems.
Section C403.4.1Fan control.
Section C403.4.2Hydronic systems controls.
Section C403.4.3Heat rejection equipment.
Section C403.4.4Requirements for mechanical systems serving multiple zones.
Section C403.4.6Hot gas bypass limitation.
Section C403.5Energy recovery.
Section C403.6Dedicated outdoor air systems (DOAS).
Section C404Service water heating (Mandatory).
Section C404.1General.
Section C404.2Service water-heating equipment performance efficiency.
Table C404.2Minimum performance of water-heating equipment.
Section C404.3Efficient heated water supply piping.
Section C404.4Heat traps.
Section C404.5Water heater installation.
Section C404.6Pipe insulation.
Section C404.7Heated-water circulating and temperature maintenance systems.
Section C404.8Demand recirculation controls.
Section C404.9Domestic hot water meters.
Section C404.10Drain water heat recovery units.
Section C404.11Pools and spas.
Section C404.13Service water-heating system commissioning and completion requirements.
Section C405Electrical power and lighting systems.
Section C405.1General.
Section C405.2Electrical power and lighting systems.
Section C405.2.1Occupant sensor controls.
Section C405.2.2Time switch controls.
Section C405.2.3Manual controls.
Section C405.2.4Daylight responsive controls.
Section C405.2.5Additional lighting controls.
Section C405.2.6Digital timer switch.
Section C405.2.7Exterior lighting controls.
Section C405.2.8Area controls.
Section C405.3Exit signs.
Section C405.4Interior lighting power requirements.
Section C405.4.1Total connected interior lighting power.
Section C405.4.2Interior lighting power requirements.
Table C405.4.2(1)Interior lighting power allowancesBuilding area method.
Table C405.4.2(2)Interior lighting power allowancesSpace-by-space method.
Section C405.5Exterior lighting.
Section C405.5.1Exterior building grounds lighting.
Section C405.5.2Exterior building lighting power.
Table C405.5.2(1)Exterior lighting zones.
Table C405.5.2(2)Individual lighting power allowances for building exteriors.
Section C405.6Electrical energy consumption.
Section C405.8Electric motors.
Section C405.9Vertical and horizontal transportation systems.
Section C405.10Controlled receptacles.
Electrical power and lighting systems commissioning and completion requirements.
Section C405.13Electrical power and lighting systems commissioning and completion requirements.
Section C406Additional efficiency package options.
Section C406.2HVAC option.
Section C406.3LPA option.
Section C406.4Lighting controls option.
Section C406.5On-site renewable energy option.
Section C406.6DOAS option.
Section C406.7Service water heating option.
Section C406.8Envelope option.
Section C406.9Air infiltration option.
Section C407—Total building performance.
Section C407.1Scope.
Section C407.2Mandatory requirements.
Section C407.3Performance-based compliance.
Section C407.4Documentation.
Section C407.5Calculation procedure.
Table C407.5.1(1)Specifications for the standard reference and proposed design.
Table C407.5.1(2)/(3)HVAC systems map.
Table C407.5.1(4)Specifications for the standard reference design HVAC system description.
Table C407.5.1(5)Number of chillers.
Table C407.5.1(6)Water chiller types.
Section C407.6Calculation software tool.
Section C408System commissioning.
Section C408.1General.
Figure C408.1.4.2Commissioning compliance checklist.
Section C408.2Mechanical systems commissioning.
Section C408.3Lighting system commissioning.
Section C408.4Service water heating systems commissioning.
Section C408.5Other systems commissioning.
Section C408.6Metering system commissioning.
Section C409Energy metering and energy consumption management.
Section C409.1General.
Section C409.2Energy source metering.
Section C409.3End-use metering.
Section C409.4Measurement devices, data acquisition system and energy display.
Section C409.5Metering for existing buildings.
Section C410Refrigeration system requirements.
Chapter 5 [CE]Existing buildings.
Section C502Additions.
Section C503Alterations.
Section C504Repairs.
Section C505Change of occupancy or use.
Appendix ADefault heat loss coefficients.
Chapter 6 [CE]Referenced standards.
Section A101General.
Section A101.1Scope.
Section A101.2Description.
Section A101.3Air films.
Section A101.4Compression of insulation.
Section A101.5Building materials.
Section A102Ceilings.
Section A102.1General.
Table A102.1Default U-factors for ceilings.
Section A102.2Component description.
Tables A102.2.4Steel truss framed ceiling Uo values.
Tables A102.2.5Default U-factors for metal building roofs.
Tables A102.2.6Assembly U-factors for roofs with insulation entirely above deck.
Section A103Above grade walls.
Section A103.1General.
Section A103.2Framing description.
Section A103.3Component description.
Section A103.3.1Single stud wall.
Section A103.3.2Strap wall.
Section A103.3.3Double stud wall.
Section A103.3.4Log wall.
Section A103.3.5Stress skin panel.
Section A103.3.6Metal stud walls.
Section A103.3.7Concrete and masonry walls.
Section A104Below-grade walls and slabs.
Section A104.1General.
Section A104.2Component description.
Section A104.3Insulation description.
Section A105Floors over unconditioned space.
Section A105.1General.
Section A105.2Crawlspace description.
Section A105.3Construction description.
Section A106On-grade slab floors.
Section A106.1General.
Section A106.2Component description.
Section A106.3Insulation description.
Section A107Default U-factors for doors.
Section A107.1Doors without NFRC certification.
Table A107.1(1)Default U-factors for doors.
Table A107.1(2)Default U-factors for revolving doors.
Table A107.1(3)Default U-factors for steel emergency doors.
Table A107.1(4)Default U-factors for steel garage and hangar doors.
Section A108Air infiltration.
Section A108.1General.
Appendix BDefault internal load values and schedules.
Section B101General.
Section B102Default tables of internal loads.
Table B102Acceptable occupancy densities, receptacle power densities and service hot water consumption.
Section B103Default schedules.
Table B103(1)Assembly occupancy.
Table B103(2)Health occupancy.
Table B103(3)Hotel/motel occupancy.
Table B103(4)Light manufacturing occupancy.
Table B103(5)Office occupancy.
Table B103(6)Parking garage occupancy.
Table B103(7)Restaurant occupancy.
Table B103(8)Retail occupancy.
Table B103(9)School and warehouse occupancies.
Appendix CExterior design conditions.
Table C-1Outdoor design temperatures for Washington.
Appendix DRenewable energy.
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