Last Update: 12/3/14

Chapter 51-11C WAC


WAC Sections

Chapter 1 CE—Scope and administration.
Section C101—Scope and general requirements.
Section C101.4—Applicability.
Table C101.4.3.2—Economizer compliance options for mechanical alterations.
Section C101.5—Compliance.
Section C102—Alternate materials—Method of construction, design or insulating systems.
Section C103—Construction documents.
Section C104—Inspections.
Section C105—Validity.
Section C106—Referenced standards.
Section C107—Fees.
Section C108—Stop work order.
Section C109—Board of appeals.
Section C110—Violations.
Section C111—Liability.
Chapter 2 CE—Definitions.
Section C201—General.
Section C202—General definitions.
Section C202.1—A.
Section C202.2—B.
Section C202.3—C.
Section C202.4—D.
Section C202.5—E.
Section C202.6—F.
Section C202.7—G.
Section C202.8—H.
Section C202.9—I.
Section C202.10—J.
Section C202.11—K.
Section C202.12—L.
Section C202.13—M.
Section C202.14—N.
Section C202.15—O.
Section C202.16—P.
Section C202.17—Q.
Section C202.18—R.
Section C202.19—S.
Section C202.20—T.
Section C202.21—U.
Section C202.22—V.
Section C202.23—W.
Section C202.24—X, Y, Z.
Chapter 3 CE—General requirements.
Section C301—Climate zones.
Section C302—Design conditions.
Section C303—Materials, systems and equipment.
Section 303.1—Identification.
Table C303.1.3(1)—Default glazed fenestration U-factor.
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 C303.2—Installation.
Section C303.3—Maintenance information.
Chapter 4 CE—Commercial energy efficiency.
Section C401—General.
Section C402—Building envelope requirements.
Section C402.1—General (Prescriptive).
Section C402.1.1—Insulation and fenestration criteria.
Section C402.1.2—U-factor alternative.
Table C402.1.2—Opaque thermal envelope assembly requirements.
Section C402.1.3—Component performance option.
Equation C402-1—Target UAt.
Equation C402-2—Proposed UAp.
Equation C402-3—Target SHGCAt.
Equation C402-4—Proposed SHGCAp.
Section C402.1.4—Semi-heated spaces.
Section C402.2—Specific insulation requirements.
Table C402.2—Opaque thermal envelope requirements.
Section C402.2.1—Roof assembly.
Table C402.2.1.1—Reflectance and emittance options.
Section C402.2.2—Classification of walls.
Section C402.2.3—Above-grade walls.
Section C402.2.4—Below-grade walls.
Section C402.2.5—Floors over unconditioned space.
Section C402.2.6—Slab on grade.
Section C402.2.7—Opaque doors.
Section C402.2.8—Insulation of radiant heating systems.
Section C402.3—Fenestration (Prescriptive).
Table C402.3—Building envelope requirements—Fenestration.
Section C402.3.1—Maximum area.
Section C402.3.2—Minimum skylight fenestration area.
Section C402.3.3—Maximum U-factor and SHGC.
Section C402.3.4—Area-weighted U-factor.
Section C402.4—Air leakage.
Section C402.4.1—Air barriers.
Section C402.4.2—Air barrier penetrations.
Section C402.4.3—Air leakage of fenestration.
Section C402.4.4—Doors and access openings.
Section C402.4.5—Air intakes, exhaust openings, stairways and shafts.
Section C402.4.6—Loading dock weatherseals.
Section C402.4.7—Vestibules.
Section C402.4.8—Recessed lighting.
Section C402.5—Walk-in coolers and walk-in freezers.
Section C402.6—Refrigerated warehouse coolers and freezers.
Section C403—Mechanical systems.
Section C403.1—General.
Section C403.2—Provisions applicable to all mechanical systems.
Section C403.2.1—Calculation of heating and cooling loads.
Section C403.2.2—Equipment and systems sizing.
Section C403.2.3—HVAC equipment performance requirements.
Table C403.2.3(1)—Minimum efficiency requirements—Electrically operated unitary air conditioners and condensing units.
Table C403.2.3(2)—Minimum efficiency requirements—Electrically operated unitary and applied heat pumps.
Table C403.2.3(3)—Minimum efficiency requirements—Electrically operated PTAC, PTHP, SPVAC, SPVHP, room air conditioners.
Table C403.2.3(4)—Minimum efficiency requirements—Warm air furnaces and unit heaters.
Table C403.2.3(5)—Minimum efficiency requirements—Gas- and oil-fired boilers.
Table C403.2.3(6)—Reserved.
Table C403.2.3(7)—Minimum efficiency requirements—Water chilling packages.
Table C403.2.3(8)—Minimum efficiency requirements—Heat rejection equipment.
Table C403.2.3(9)—Minimum efficiency requirements—Heat transfer equipment.
Section C403.2.4—HVAC system controls.
Section C403.2.4.1—Thermostatic controls.
Section C403.2.4.2—Setpoint overlap restriction.
Section C403.2.4.3—Off-hour controls.
Section C403.2.4.4—Shutoff damper controls.
Section C403.2.4.5—Snowmelt system controls.
Section C403.2.4.6—Combustion heating equipment controls.
Section C403.2.4.7—Hotel/motel controls.
Section C403.2.4.8—Residential occupancy controls.
Section C403.2.4.9—Direct digital control system capabilities.
Section C403.2.5—Ventilation.
Section C403.2.5.1—Demand control ventilation.
Section C403.2.5.2—Occupancy sensors.
Section C403.2.5.3—Loading dock and parking garage ventilation system controls.
Section C403.2.5.4—Exhaust systems.
Section C403.2.6—Energy recovery.
Table C403.2.6—Energy recovery requirement.
Section C403.2.7—Duct and plenum insulation and sealing.
Section C403.2.8—Piping insulation.
Table C403.2.8—Minimum pipe insulation thickness.
Section C403.2.9—Mechanical system commissioning and completion requirements.
Section C403.2.10—Air system design and control.
Table C403.2.10.1—Fan power limitation.
Section C403.2.11—Heating outside a building.
Section C403.2.12—System criteria.
Section C403.2.13—Electric motor efficiency.
Section C403.3—Simple HVAC systems and equipment.
Section C403.3.1—Economizers.
Section C403.3.2—Hydronic system controls.
Section C403.4—Complex HVAC systems and equipment.
Section C403.4.1—Economizers.
Section C403.4.2—VAV fan control.
Section C403.4.3—Hydronic systems controls.
Table C403.—High limit shutoff controls.
Section C403.4.4—Heat rejection equipment fan speed control.
Section C403.4.5—Requirements for complex mechanical systems serving multiple zones.
Section C403.4.6—Heat recovery for service water heating.
Section C403.4.7—Hot gas bypass limitation.
Section C403.5—Walk-in coolers and freezers.
Section C403.6—Refrigerated warehouse coolers and freezers.
Section C404—Service water heating (Mandatory).
Section C404.1—General.
Section C404.2—Service water-heating equipment performance efficiency.
Table C404.2—Minimum performance of water-heating equipment.
Section C404.3—Temperature controls.
Section C404.4—Heat traps.
Section C404.5—Water heater installation.
Section C404.6—Pipe insulation.
Section C404.7—Hot water system controls.
Section C404.8—Shut-off controls.
Section C404.9—Domestic hot water meters.
Section C404.10—Pools and in-ground spas.
Section C405—Electrical power and lighting systems.
Section C405.1—General.
Section C405.2—Electrical power and lighting systems.
Section C405.2.1—Manual lighting controls.
Section C405.2.2—Additional lighting controls.
Section C405.2.3—Specific application controls.
Section C405.2.4—Exterior lighting controls.
Section C405.2.5—Area controls.
Section C405.3—Reserved.
Section C405.4—Exit signs.
Section C405.5—Interior lighting power requirements.
Section C405.5.1—Total connected interior lighting power.
Section C405.5.2—Interior lighting power requirements.
Table C405.5.2(1)—Interior lighting power allowances—Building area method.
Table C405.5.5.2(2)—Interior lighting power allowances—Space-by-space method.
Section C405.6—Exterior lighting.
Section C405.6.1—Exterior building grounds lighting.
Section C405.6.2—Exterior building lighting power.
Table C405.6.2(1)—Exterior lighting zones.
Table C405.6.2(2)—Individual lighting power allowances for building exteriors.
Section C405.7—Electrical energy consumption.
Section C405.8—Electric motors.
Section C405.9—Transformers.
Section C405.10—Walk-in coolers and freezers.
Section C405.11—Refrigerated warehouse coolers and freezers.
Section C405.12—Escalators and moving walks.
Section C405.13—Electrical power and lighting systems commissioning and completion requirements.
Section C406—Additional efficiency package options.
Section C407—Total building performance.
Section C407.1—Scope.
Section C407.2—Mandatory requirements.
Section C407.3—Performance-based compliance.
Section C407.4—Documentation.
Section C407.5—Calculation procedure.
Table C407.5.1(1)—Specifications for the standard reference and proposed design.
Table C407.5.1(2)—HVAC systems map.
Table C407.5.1(3)—Specifications for the standard reference design HVAC system description.
Table C407.5.1(4)—Number of chillers.
Table C407.5.1(5)—Water chiller types.
Section C407.6—Calculation software tool.
Section C408—System commissioning.
Section C408.1—General.
Figure C408.1.2.1—Commissioning compliance checklist.
Section C408.2—Mechanical systems commissioning and completion requirements.
Section C408.3—Lighting system functional testing.
Section C408.4—Service water heating systems commissioning and completion requirements.
Section C408.5—Metering system commissioning.
Section C409—Energy metering and energy consumption management.
Section C409.1—General.
Section C409.2—Energy source metering.
Section C409.3—End-use metering.
Section C409.4—Measurement devices, data acquisition system and energy display.
Section C409.5—Metering for existing buildings.
Chapter 5 CE—Referenced standards.
Appendix A—Default heat loss coefficients.
Section A101—General.
Section A101.1—Scope.
Section A101.2—Description.
Section A101.3—Air films.
Section A101.4—Compression of insulation.
Section A101.5—Building materials.
Section A102—Ceilings.
Section A102.1—General.
Table A102.1—Default U-factors for ceilings.
Section A102.2—Component description.
Tables A102.2.4—Steel truss framed ceiling Uo values.
Tables A102.2.5—Default U-factors for metal building roofs.
Tables A102.2.6—Assembly U-factors for roofs with insulation entirely above deck.
Section A103—Above grade walls.
Section A103.1—General.
Section A103.2—Framing description.
Section A103.3—Component description.
Section A103.3.1—Single stud wall.
Section A103.3.2—Strap wall.
Section A103.3.3—Double stud wall.
Section A103.3.4—Log wall.
Section A103.3.5—Stress skin panel.
Section A103.3.6—Metal stud walls.
Section A103.3.7—Concrete and masonry walls.
Section A104—Below-grade walls and slabs.
Section A104.1—General.
Section A104.2—Component description.
Section A104.3—Insulation description.
Section A105—Floors over unconditioned space.
Section A105.1—General.
Section A105.2—Crawlspace description.
Section A105.3—Construction description.
Section A106—On-grade slab floors.
Section A106.1—General.
Section A106.2—Component description.
Section A106.3—Insulation description.
Section A107—Default U-factors for doors.
Section A107.1—Doors 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 A108—Air infiltration.
Section A108.1—General.
Appendix B—Default internal load values and schedules.
Section B101—General.
Section B102—Default tables of internal loads.
Table B102—Acceptable occupancy densities, receptacle power densities and service hot water consumption.
Section B103—Default 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 C—Exterior design conditions.
Table C-1—Outdoor design temperatures for Washington.