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Chapter 51-11C WAC

|Show DispositionsLast Update: 8/7/24

STATE BUILDING CODE ADOPTION AND AMENDMENT OF THE 2021 EDITION OF THE INTERNATIONAL ENERGY CONSERVATION CODE, COMMERCIAL

WAC Sections

HTMLPDF51-11C-10000Chapter 1 CEScope and administration.
HTMLPDF51-11C-10100Section C101Scope and general requirements.
HTMLPDF51-11C-10140Section C101.4Applicability.
HTMLPDF51-11C-10143Reserved.
HTMLPDF51-11C-10150Section C101.5Compliance.
HTMLPDF51-11C-10200Section C102Alternative materials, design and methods of construction and equipment.
HTMLPDF51-11C-10300Section C103Construction documents.
HTMLPDF51-11C-10400Section C104Fees.
HTMLPDF51-11C-10500Section C105Inspections.
HTMLPDF51-11C-10600Section C106Notice of approval.
HTMLPDF51-11C-10700Section C107Validity.
HTMLPDF51-11C-10800Section C108Referenced standards.
HTMLPDF51-11C-10900Section C109Stop work order.
HTMLPDF51-11C-11000Section C110Board of appeals.
HTMLPDF51-11C-11100Section C111Violations.
HTMLPDF51-11C-11200Section C112Liability.
HTMLPDF51-11C-20000Chapter 2 CEDefinitions.
HTMLPDF51-11C-20100Section C201General.
HTMLPDF51-11C-20200Section C202General definitions.
HTMLPDF51-11C-20201Section C202.1A.
HTMLPDF51-11C-20202Section C202.2B.
HTMLPDF51-11C-20203Section C202.3C.
HTMLPDF51-11C-20204Section C202.4D.
HTMLPDF51-11C-20205Section C202.5E.
HTMLPDF51-11C-20206Section C202.6F.
HTMLPDF51-11C-20207Section C202.7G.
HTMLPDF51-11C-20208Section C202.8H.
HTMLPDF51-11C-20209Section C202.9I.
HTMLPDF51-11C-20210Section C202.10J.
HTMLPDF51-11C-20211Section C202.11K.
HTMLPDF51-11C-20212Section C202.12L.
HTMLPDF51-11C-20213Section C202.13M.
HTMLPDF51-11C-20214Section C202.14N.
HTMLPDF51-11C-20215Section C202.15O.
HTMLPDF51-11C-20216Section C202.16P.
HTMLPDF51-11C-20217Section C202.17Q.
HTMLPDF51-11C-20218Section C202.18R.
HTMLPDF51-11C-20219Section C202.19S.
HTMLPDF51-11C-20220Section C202.20T.
HTMLPDF51-11C-20221Section C202.21U.
HTMLPDF51-11C-20222Section C202.22V.
HTMLPDF51-11C-20223Section C202.23W.
HTMLPDF51-11C-20224Section C202.24X, Y, Z.
HTMLPDF51-11C-30000Chapter 3 CEGeneral requirements.
HTMLPDF51-11C-30100Section C301Climate zones.
HTMLPDF51-11C-30200Section C302Design conditions.
HTMLPDF51-11C-30300Section C303Materials, systems and equipment.
HTMLPDF51-11C-30310Section 303.1Identification.
HTMLPDF51-11C-303131Table C303.1.3(1)Default glazed window, glass door and skylight U-factors.
HTMLPDF51-11C-303132Table C303.1.3(2)Default door U-factors.
HTMLPDF51-11C-303133Table C303.1.3(3)Default glazed fenestration SHGC and VT.
HTMLPDF51-11C-303134Table C303.1.3(4)Default U-factors for skylights.
HTMLPDF51-11C-303135Table C303.1.3(5)Small business compliance default table.
HTMLPDF51-11C-30315Table C303.1.5U-factors for spandrel panels and glass curtain walls.
HTMLPDF51-11C-30320Section C303.2Installation.
HTMLPDF51-11C-30330Reserved.
HTMLPDF51-11C-40000Chapter 4 CECommercial energy efficiency.
HTMLPDF51-11C-40100Section C401General.
HTMLPDF51-11C-40200Section C402Building envelope requirements.
HTMLPDF51-11C-40210Section C402.1General (Prescriptive).
HTMLPDF51-11C-40211Section C402.1.1Low energy buildings.
HTMLPDF51-11C-40212Section C402.1.2Equipment buildings.
HTMLPDF51-11C-402121Table C402.1.3Opaque thermal envelope assembly R-value requirements.
HTMLPDF51-11C-40213Section C402.1.3Insulation component R-value method.
HTMLPDF51-11C-40214Section C402.1.4Assembly U-factor, C-factor, or F-factor-based method.
HTMLPDF51-11C-402141Table C402.1.4Opaque thermal envelope requirements, U-factor method.
HTMLPDF51-11C-402142Table C402.1.4.2Effective R-values for steel stud wall assemblies.
HTMLPDF51-11C-40215Section C402.1.5Component performance alternative.
HTMLPDF51-11C-40220Section C402.2Specific insulation requirements.
HTMLPDF51-11C-40221Section C402.2.1Roof assembly.
HTMLPDF51-11C-402211Reserved.
HTMLPDF51-11C-40222Section C402.2.2Above-grade walls.
HTMLPDF51-11C-40223Section C402.2.3Floors.
HTMLPDF51-11C-40224Section C402.2.4Slab-on-grade.
HTMLPDF51-11C-40225Section C402.2.5Below-grade walls.
HTMLPDF51-11C-40226Section C402.2.6Insulation of radiant heating systems.
HTMLPDF51-11C-40227Section C402.2.7Airspaces.
HTMLPDF51-11C-40228Section C402.2.8Above-grade exterior concrete slabs.
HTMLPDF51-11C-40229Section C402.2.9Vertical fenestration intersection with opaque walls.
HTMLPDF51-11C-40230Section C402.4Fenestration.
HTMLPDF51-11C-402300Table C402.4Building envelope requirementsFenestration.
HTMLPDF51-11C-40231Section C402.4.1Maximum area.
HTMLPDF51-11C-40232Section C402.4.2Minimum skylight fenestration area.
HTMLPDF51-11C-40233Section C402.4.3Maximum U-factor and SHGC.
HTMLPDF51-11C-40234Section C402.4.4Doors.
HTMLPDF51-11C-40240Section C402.5Air leakage-thermal envelope.
HTMLPDF51-11C-40241Section C402.5.1Air barriers.
HTMLPDF51-11C-40243Section C402.5.5Rooms containing fuel-burning appliances.
HTMLPDF51-11C-40244Section C402.5.6Doors and access openings.
HTMLPDF51-11C-40245Section C402.5.7Air intakes, exhaust openings, stairways and shafts.
HTMLPDF51-11C-40246Section C402.5.8Loading dock weatherseals.
HTMLPDF51-11C-40247Section C402.5.9Vestibules.
HTMLPDF51-11C-40248Section C402.5.10Recessed lighting.
HTMLPDF51-11C-40250Reserved.
HTMLPDF51-11C-40260Reserved.
HTMLPDF51-11C-40300Section C403Mechanical systems.
HTMLPDF51-11C-40310Section C403.1General.
HTMLPDF51-11C-40314Section C403.1.4HVAC heating equipment.
HTMLPDF51-11C-40320Section C403.2System design.
HTMLPDF51-11C-40321Section C403.2.1Zone isolation.
HTMLPDF51-11C-40322Section C403.2.2Ventilation and exhaust.
HTMLPDF51-11C-40323Section C403.2.3Fault detection and diagnostics.
HTMLPDF51-11C-40324Section C403.2.4Variable flow capacity.
HTMLPDF51-11C-40325Reserved.
HTMLPDF51-11C-40326Reserved.
HTMLPDF51-11C-40327Reserved.
HTMLPDF51-11C-40328Reserved.
HTMLPDF51-11C-40329Reserved.
HTMLPDF51-11C-40330Section C403.3Equipment selection.
HTMLPDF51-11C-40331Section C403.3.1Equipment and system sizing.
HTMLPDF51-11C-40332Section C403.3.2HVAC equipment performance requirements.
HTMLPDF51-11C-403321Table C403.3.2(1)Electrically operated unitary air conditioners and condensing units.
HTMLPDF51-11C-403322Table C403.3.2(2)Electrically operated air-cooled unitary heat pumpsMinimum efficiency requirements.
HTMLPDF51-11C-403323Table C403.3.2(3)Water chilling packagesMinimum efficiency requirements.
HTMLPDF51-11C-403324Table C403.3.2(4)Minimum efficiency requirementsElectrically operated PTAC, PTHP, SPVAC, SPVHP, room air conditioners.
HTMLPDF51-11C-403325Table C403.3.2(5)Minimum efficiency requirementsWarm air furnaces and unit heaters.
HTMLPDF51-11C-403326Table C403.3.2(6)Minimum efficiency requirementsGas-fired and oil-fired boilers.
HTMLPDF51-11C-403327Table C403.3.2(7)Heat rejection equipmentMinimum efficiency requirements.
HTMLPDF51-11C-403328Table C403.3.2(8)Electrically operated variable refrigerant flow air conditionersMinimum efficiency requirements.
HTMLPDF51-11C-403329Tables C403.3.2(9) through C403.3.2(16)HVAC equipment minimum efficiency requirements.
HTMLPDF51-11C-40333Section C403.3.3Hot gas bypass.
HTMLPDF51-11C-40334Section C403.3.4Boilers.
HTMLPDF51-11C-40335Section C403.3.5Dedicated outdoor air systems.
HTMLPDF51-11C-40336Section C403.3.6Ventilation for Group R-2 occupancy.
HTMLPDF51-11C-40337Section C403.3.7Hydronic system flow rate.
HTMLPDF51-11C-40338Section C403.3.8Hydronic coils.
HTMLPDF51-11C-40340Section C403.4HVAC system controls.
HTMLPDF51-11C-40341Section C403.4.1Thermostatic controls.
HTMLPDF51-11C-40342Section C403.4.2Off-hour controls.
HTMLPDF51-11C-40343Section C403.4.3Hydronic systems controls.
HTMLPDF51-11C-403431Reserved.
HTMLPDF51-11C-40344Section C403.4.4Part load controls.
HTMLPDF51-11C-40345Section C403.4.5Pump isolation.
HTMLPDF51-11C-40346Section C403.4.6Variable flow controls.
HTMLPDF51-11C-40347Section C403.4.7Combustion heating equipment controls.
HTMLPDF51-11C-40348Sections C403.4.8 through C403.4.10Group R requirements.
HTMLPDF51-11C-40349Sections C403.4.11 and C403.4.12.
HTMLPDF51-11C-40350Section C403.5Economizers.
HTMLPDF51-11C-40351Section C403.5.1Integrated economizer control.
HTMLPDF51-11C-40352Section C403.5.2Economizer heating system impact.
HTMLPDF51-11C-40353Section C403.5.3Air economizers.
HTMLPDF51-11C-40354Section C403.5.4Waterside economizers.
HTMLPDF51-11C-40355Section C403.5.5Economizer fault detection and diagnostics.
HTMLPDF51-11C-40360Section C403.6Requirements for mechanical systems serving multiple zones.
HTMLPDF51-11C-403610Section C403.6.10High efficiency VAV systems.
HTMLPDF51-11C-4037Section C403.7Ventilation and exhaust systems.
HTMLPDF51-11C-40371Section C403.7.1Demand control ventilation.
HTMLPDF51-11C-40372Section C403.7.2Occupancy sensors.
HTMLPDF51-11C-40373Section C403.7.3Ventilation air heating control.
HTMLPDF51-11C-40374Section C403.7.4HVAC serving guestrooms.
HTMLPDF51-11C-40375Section C403.7.5Loading dock and garage ventilation system controls.
HTMLPDF51-11C-40376Section C403.7.6Energy recovery ventilation systems.
HTMLPDF51-11C-40377Section C403.7.7—Exhaust systems.
HTMLPDF51-11C-40378Section C403.7.8Shutoff dampers.
HTMLPDF51-11C-4038Section C403.8Fan and fan controls.
HTMLPDF51-11C-4039Section C403.9Heat rejection and heat recovery equipment.
HTMLPDF51-11C-40391Section C403.10Construction of HVAC system elements.
HTMLPDF51-11C-40392Section C403.11Mechanical systems outside the building envelope.
HTMLPDF51-11C-40393Section C403.12High efficiency single zone VAV systems.
HTMLPDF51-11C-40394Section C403.13Dehumidification for plant growth.
HTMLPDF51-11C-40400Section C404Service water heating and pressure-booster systems.
HTMLPDF51-11C-40401Section C404.1General.
HTMLPDF51-11C-40402Section C404.2Service water-heating equipment performance efficiency.
HTMLPDF51-11C-404021Table C404.2Minimum performance of water-heating equipment.
HTMLPDF51-11C-40403Section C404.3Efficient heated water supply piping.
HTMLPDF51-11C-40404Section C404.4Heat traps.
HTMLPDF51-11C-40405Section C404.5Water heater installation.
HTMLPDF51-11C-40406Section C404.6Pipe insulation.
HTMLPDF51-11C-40407Section C404.7Heated-water circulating and temperature maintenance systems.
HTMLPDF51-11C-40408Section C404.8Demand recirculation controls.
HTMLPDF51-11C-40409Section C404.9Domestic hot water meters.
HTMLPDF51-11C-404091Section C404.10Drain water heat recovery units.
HTMLPDF51-11C-40410Section C404.11Pools and spas.
HTMLPDF51-11C-40413Section C404.13Service water pressure-booster systems.
HTMLPDF51-11C-40414Section C404.14Demand responsive water heating.
HTMLPDF51-11C-40415Section C404.15Service water heating commissioning.
HTMLPDF51-11C-40500Section C405Electrical power and lighting systems.
HTMLPDF51-11C-40501Section C405.1General.
HTMLPDF51-11C-40502Section C405.2Electrical power and lighting systems.
HTMLPDF51-11C-405021Section C405.2.1Occupant sensor controls.
HTMLPDF51-11C-405022Section C405.2.2Time switch controls.
HTMLPDF51-11C-405023Section C405.2.3Manual controls.
HTMLPDF51-11C-405024Section C405.2.4Light-reduction controls.
HTMLPDF51-11C-405025Section C405.2.5Daylight responsive controls.
HTMLPDF51-11C-405026Section C405.2.6Additional lighting controls.
HTMLPDF51-11C-405027Section C405.2.7Area controls.
HTMLPDF51-11C-405028Section C405.2.8Advanced lighting controls.
HTMLPDF51-11C-405029Section C405.2.9Exterior lighting controls.
HTMLPDF51-11C-40503Section C405.2.10Parking garage lighting control.
HTMLPDF51-11C-405030Section C405.3Lighting for plant growth and maintenance.
HTMLPDF51-11C-40504Reserved.
HTMLPDF51-11C-40505Section C405.4Interior lighting power requirements.
HTMLPDF51-11C-405051Section C405.4.1Total connected interior lighting power.
HTMLPDF51-11C-405052Section C405.4.2Interior lighting power requirements.
HTMLPDF51-11C-405053Table C405.4.2(1)Interior lighting power allowancesBuilding area method.
HTMLPDF51-11C-405054Table C405.4.2(2)Interior lighting power allowancesSpace-by-space method.
HTMLPDF51-11C-40506Section C405.5Exterior lighting.
HTMLPDF51-11C-405061Section C405.5.1Exterior building grounds lighting.
HTMLPDF51-11C-405062Section C405.5.2Exterior building lighting power.
HTMLPDF51-11C-405063Table C405.5.3(1)Exterior lighting zones.
HTMLPDF51-11C-405064Table C405.5.3(2)Individual lighting power allowances for building exteriors.
HTMLPDF51-11C-40507Sections C405.6 and C405.7Electrical energy consumption.
HTMLPDF51-11C-40508Section C405.8Electric motors.
HTMLPDF51-11C-40509Section C405.9Vertical and horizontal transportation systems.
HTMLPDF51-11C-40510Section C405.10Controlled receptacles.
HTMLPDF51-11C-40511Section C405.11Voltage drop.
HTMLPDF51-11C-40512Section C405.12Alternating current-output uninterruptible power supplies (AC-output UPS).
HTMLPDF51-11C-40513Section C405.13Electrical commissioning.
HTMLPDF51-11C-40600Section C406Efficiency and load management measures.
HTMLPDF51-11C-40602Reserved.
HTMLPDF51-11C-40603Reserved.
HTMLPDF51-11C-40604Reserved.
HTMLPDF51-11C-40605Reserved.
HTMLPDF51-11C-40606Reserved.
HTMLPDF51-11C-40607Reserved.
HTMLPDF51-11C-40608Reserved.
HTMLPDF51-11C-40609Reserved.
HTMLPDF51-11C-40610Reserved.
HTMLPDF51-11C-40611Reserved.
HTMLPDF51-11C-40612Reserved.
HTMLPDF51-11C-40620Section C406.2Additional energy efficiency credit measures.
HTMLPDF51-11C-40621Section C406.2.1Dwelling unit HVAC measures.
HTMLPDF51-11C-40622Section C406.2.2HVAC measures.
HTMLPDF51-11C-40623Section C406.2.3Lighting measures.
HTMLPDF51-11C-40624Section C406.2.5Renewable energy measures.
HTMLPDF51-11C-40625Section C406.2.6Service water measures.
HTMLPDF51-11C-40626Section C406.2Envelope measures.
HTMLPDF51-11C-40627Section C406.2Other measures.
HTMLPDF51-11C-40630Section C406.3Load management credits.
HTMLPDF51-11C-40700Section C407—Total building performance.
HTMLPDF51-11C-40701Section C407.1Scope.
HTMLPDF51-11C-40702Section C407.2Mandatory requirements.
HTMLPDF51-11C-40703Section C407.3Performance-based compliance.
HTMLPDF51-11C-407031Tables for Section C407.3.
HTMLPDF51-11C-40704Section C407.4Reserved.
HTMLPDF51-11C-40705Section C407.5Reserved.
HTMLPDF51-11C-407051Reserved.
HTMLPDF51-11C-407052Reserved.
HTMLPDF51-11C-407053Reserved.
HTMLPDF51-11C-407054Reserved.
HTMLPDF51-11C-407055Reserved.
HTMLPDF51-11C-40706Section C407.6Reserved.
HTMLPDF51-11C-40800Section C408System commissioning.
HTMLPDF51-11C-40801Section C408.1General.
HTMLPDF51-11C-408012Figure C408.1.4.1Commissioning compliance checklist.
HTMLPDF51-11C-40802Section C408.2Mechanical systems commissioning.
HTMLPDF51-11C-40803Section C408.3Service water heating systems commissioning.
HTMLPDF51-11C-40804Section C408.4Controlled receptacle and lighting control system commissioning.
HTMLPDF51-11C-408045Section C408.5Other systems commissioning.
HTMLPDF51-11C-40805Section C408.6Metering system commissioning.
HTMLPDF51-11C-40807Section C408.7Refrigeration system commissioning.
HTMLPDF51-11C-40900Section C409Energy metering and energy consumption management.
HTMLPDF51-11C-40901Section C409.1General.
HTMLPDF51-11C-40902Section C409.2Energy source metering.
HTMLPDF51-11C-40903Section C409.3End-use metering.
HTMLPDF51-11C-40904Section C409.4Measurement devices, data acquisition system and energy display.
HTMLPDF51-11C-40905Reserved.
HTMLPDF51-11C-41000Section C410Refrigeration system requirements.
HTMLPDF51-11C-41100Section C411Renewable energy.
HTMLPDF51-11C-41200Section C412Compressed air systems.
HTMLPDF51-11C-50000Chapter 5 [CE]Existing buildings.
HTMLPDF51-11C-50200Section C502Additions.
HTMLPDF51-11C-50300Section C503Alterations.
HTMLPDF51-11C-50400Section C504Repairs.
HTMLPDF51-11C-50500Section C505Change of space conditioning, occupancy or use.
HTMLPDF51-11C-50600Section C506Metering for existing buildings.
HTMLPDF51-11C-60000Reserved.
HTMLPDF51-11C-600000Chapter 6 [CE]Referenced standards.
HTMLPDF51-11C-61000Appendix ADefault heat loss coefficients.
HTMLPDF51-11C-61010Section A101General.
HTMLPDF51-11C-61011Section A101.1Scope.
HTMLPDF51-11C-61012Section A101.2Description.
HTMLPDF51-11C-61013Section A101.3Air films.
HTMLPDF51-11C-61014Section A101.4Compression of insulation.
HTMLPDF51-11C-61015Section A101.5Building materials.
HTMLPDF51-11C-61020Section A102Ceilings.
HTMLPDF51-11C-61021Section A102.1General.
HTMLPDF51-11C-610211Table A102.1Default U-factors for ceilings.
HTMLPDF51-11C-61022Section A102.2Component description.
HTMLPDF51-11C-610221Tables A102.2.4Steel truss framed ceiling Uo values.
HTMLPDF51-11C-610225Tables A102.2.5Default U-factors for metal building roofs.
HTMLPDF51-11C-610226Tables A102.2.6Assembly U-factors for roofs with insulation entirely above deck.
HTMLPDF51-11C-61030Section A103Above grade walls.
HTMLPDF51-11C-61031Section A103.1General.
HTMLPDF51-11C-61032Section A103.2Framing description.
HTMLPDF51-11C-61033Section A103.3Component description.
HTMLPDF51-11C-610331Section A103.3.1Single stud wall.
HTMLPDF51-11C-610332Section A103.3.2Strap wall.
HTMLPDF51-11C-610333Section A103.3.3Double stud wall.
HTMLPDF51-11C-610334Section A103.3.4Log wall.
HTMLPDF51-11C-610335Section A103.3.5Stress skin panel.
HTMLPDF51-11C-610336Section A103.3.6Metal stud walls.
HTMLPDF51-11C-610337Section A103.3.7Concrete and masonry walls.
HTMLPDF51-11C-61040Section A104Below-grade walls and slabs.
HTMLPDF51-11C-61041Section A104.1General.
HTMLPDF51-11C-61042Section A104.2Component description.
HTMLPDF51-11C-61043Section A104.3Insulation description.
HTMLPDF51-11C-61050Section A105Floors over unconditioned space.
HTMLPDF51-11C-61051Section A105.1General.
HTMLPDF51-11C-61052Section A105.2Crawlspace description.
HTMLPDF51-11C-61053Section A105.3Construction description.
HTMLPDF51-11C-61060Section A106On-grade slab floors.
HTMLPDF51-11C-61061Section A106.1General.
HTMLPDF51-11C-61062Section A106.2Component description.
HTMLPDF51-11C-61063Section A106.3Insulation description.
HTMLPDF51-11C-61070Section A107Default U-factors for doors.
HTMLPDF51-11C-61071Section A107.1Doors without NFRC certification.
HTMLPDF51-11C-610711Table A107.1(1)Default U-factors for doors.
HTMLPDF51-11C-610712Table A107.1(2)Default U-factors for revolving doors.
HTMLPDF51-11C-610713Table A107.1(3)Default U-factors for steel emergency doors.
HTMLPDF51-11C-610714Table A107.1(4)Default U-factors for steel garage and hangar doors.
HTMLPDF51-11C-61080Section A108Air infiltration.
HTMLPDF51-11C-61081Section A108.1General.
HTMLPDF51-11C-70000Appendix BDefault internal load values and schedules.
HTMLPDF51-11C-71010Section B101General.
HTMLPDF51-11C-71020Section B102Default tables of internal loads.
HTMLPDF51-11C-71021Table B102Acceptable occupancy densities, receptacle power densities and service hot water consumption.
HTMLPDF51-11C-71030Section B103Default schedules.
HTMLPDF51-11C-71031Table B103(1)Assembly occupancy.
HTMLPDF51-11C-71032Table B103(2)Health occupancy.
HTMLPDF51-11C-71033Table B103(3)Hotel/motel occupancy.
HTMLPDF51-11C-71034Table B103(4)Light manufacturing occupancy.
HTMLPDF51-11C-71035Table B103(5)Office occupancy.
HTMLPDF51-11C-71036Table B103(6)Parking garage occupancy.
HTMLPDF51-11C-71037Table B103(7)Restaurant occupancy.
HTMLPDF51-11C-71038Table B103(8)Retail occupancy.
HTMLPDF51-11C-71039Table B103(9)School and warehouse occupancies.
HTMLPDF51-11C-80000Appendix CExterior design conditions.
HTMLPDF51-11C-80100Table C-1Outdoor design temperatures for Washington.
HTMLPDF51-11C-80500Appendix DCalculation of HVAC total system performance ratio.
HTMLPDF51-11C-90000Appendix EReserved.
HTMLPDF51-11C-90500Appendix FOutcome-based energy budget.