2009 Washington State Energy Code/2012 International Energy Code Comparison

Transcription

1 2009 Washington State Energy Code/2012 International Energy Code Comparison This document lists additions, deletions and changes to the 2012 IECC which were done by the Washington State Building Code Council s Energy Code Technical Advisory Group (TAG). The TAG is made up of 26 individuals who represent the various stakeholders in the construction industry. The amended 2012 IECC and the list of TAG members can be found at: At this time, this document contains proposed amendments to the 2012 IECC. Remember that final approval from the SBCC will not happen until December 1, Underlined text are additions and strikethrough text are deletions. WSEC Section IECC Section Code Language Comment R101.2 This code applies to residential buildings and the buildings sites and associated systems and equipment. This code shall be the maximum and minimum energy code for residential construction in each town, city and county. This addition was added to the IECC to comply with state law RCW 19.27A R The building official may modify the specific requirements of this Code for historic buildings and require in lieu thereof alternate requirements which will result in a reasonable degree of energy efficiency R Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with insulation. 2x4 framed walls shall be insulated to a minimum of R-15 and 2x6 framed walls shall be insulated to a minimum of R-21. This WSEC language was added to the IECC to allow flexibility for the Building Official when dealing with projects that have historical significance. WSEC language for clarification

2 R The building official may approve designs of alterations or repairs which do not fully conform with all of the requirements of this Code where in the opinion of the building official full compliance is physically impossible and/or economically impractical and: 1. The alteration or repair improves the energy efficiency of the building; or 2. The alteration or repair is energy efficient and is necessary for the health, safety, and welfare of the general public. This WSEC language was added to allow flexibility for the Building Official R When a space-conditioning system is altered by the installation or replacement of spaceconditioning equipment (including replacement of the air handler, outdoor condensing unit of a split system air conditioner or heat pump, cooling or heating coil, or the furnace heat exchanger), the duct system that is connected to the new or replacement space-conditioning equipment shall be tested as specified in RS-33. The test results shall be provided to the building official and the homeowner. Exceptions: 1. Duct systems that are documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in RS Ducts with less than 40 linear feet in unconditioned spaces. Language from WSEC added for alterations of HVAC equipment. Sealing is still not mandatory. Homeowners have the choice to seal or not.

3 3. Existing duct systems constructed, insulated or sealed with asbestos. 4. Additions of less than 750 square feet R Any space not within the scope of Section R101.2 which is converted to space that is within the scope of Section R101.2 shall be brought into full compliance with this Code. Spaces undergoing a change in occupancy that would result in an increase in demand for either fossil fuel or electrical energy shall comply with this code R Greenhouses isolated from any conditioned space and not intended for occupancy. NA R The code official or other authority having jurisdiction shall be permitted to deem a national, state or local energy efficiency program to exceed the energy efficiency required by this code. Buildings approved in writing by such an energy efficiency program shall be considered in compliance with this code. The requirements identified as mandatory in Chapter 4 shall be met R The building official, upon notification, shall make a wall insulation inspection in addition to those inspections required in Section R109 of the This WSEC language was added to clarify the requirements when a change of use occurs. The IECC language makes it difficult to determine if compliance with this code is necessary or not without a pre-construction inspection, submittal of previous energy bill or other means to figure out if the change of use will increase energy usage or not. This WSEC language was added because it is required by RCW 19.27A This section deleted because of the conflict with R101.2 minimum and maximum code language. Also, it reduces the need for jurisdictions to analyze various codes to determine if they exceed the requirements of the IECC. This WSEC language added because it is required by RCW 19.27A

4 International Residential Code. This inspection shall be made after all wall insulation, air barrier and vapor retarder materials are in place, but before any wall covering is placed. 108 R106.4 The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law. In addition to the requirements of this Code, all occupancies shall conform to the provisions included in the State Building Code (Chapter RCW). In case of conflicts among Codes enumerated in RCW subsections (1), (2), (3) and (4) and this Code, an earlier named Code shall govern over those following. In the case of conflict between the duct sealing and insulation requirements of this Code and the duct insulation requirements of Sections 603 and 604 of the State Mechanical Code (Chapter WAC), the duct insulation requirements of this code, or where applicable, a local jurisdiction s energy code shall govern. This WSEC language added because it is required by RCW 19.27A R U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled U-factor shall be assigned a default U-factor from Table R (1) or R (2) or R (4). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products (windows, glazed doors and skylights) shall be determined Includes small business exception from WSEC

5 in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table R (3). Exception: Units without NFRC ratings produced by a small business may be assigned default U- factors from Table R (5) for vertical fenestration R302.2 The heating or cooling outdoor design temperatures shall be selected from Appendix B Projects shall comply with Sections identified as mandatory and with either sections identified as prescriptive or the performance approach in Section R405. In addition, projects shall comply with Section R406. This section adds WSEC Table 3-1 (Appendix B) to the code. Appendix B contains heating and cooling design temperatures for various locations in Washington. Section R406 is the WSEC Chapter 9 credit requirements

6 Tables 6-1 and 6-2 Table R R-values and U-factors changed to reflect current WSEC requirements. Crawl space wall insulation R-values deleted as they are less restrictive than current WSEC requirements. Note that Climate Zones 5 and Marine 4 have the same R-values. This will apply to all areas of Washington State with the exception of Okanogan, Ferry, Stevens and Pend Oreille Counties. All climate zones do not have glazing area restrictions. Footnotes to Table R a. R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design thickness of the insulation, the installed compressed R-value of the insulation from Appendix Table A101.4 shall not be less than the R-value specified in the table. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. Exception: Skylights may be excluded from glazed fenestration SHGC requirements in Climate Zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.

7 c. 10/15/19 21+TB means R-15 R-10continuous insulation on the interior or exterior of the home wall, or R-15 on the continuous insulation on the interior of the wall, or R-19 R-21cavity insulation plus a thermal break between the slab and the basement wall at the interior of the basement wall. 10/15/19 21+TB shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the home wall. 10/13 means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. TB means thermal break between floor slab and basement wall. d. R-5 be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Climate Zones 1 through 3 for heated slabs. R-10 continuous insulation is required under heated (radiant) slab on grade floors. See R e. There are no SHGC requirements in the Marine Zone. f. Basement wall insulation is not required in warm-humid locations as defined by Figure R301.1 and Table R g. Or insulation sufficient to fill the framing cavity, R-19 minimum. Reserved. h. First value is cavity insulation, second is continuous insulation or insulated siding, so 13+5 means R-13 cavity insulation plus R-5 continuous insulation or insulated siding. If structural sheathing covers 40 percent or less of the exterior, continuous insulation R-value shall be permitted to be reduced by no more than R-3 in the locations where structural sheathing is used to maintain a consistent total sheathing thickness. i. The second R-value applies when more than half the insulation is on the interior of the mass wall. j. For single rafter- or joist-vaulted ceilings, the insulation may be reduced to R-38. k. Int. (intermediate framing) denotes standard framing 16 inches on center with headers insulated with a minimum of R-10 insulation. l. Log and solid timber walls with a minimum average thickness of 3.5 inches are exempt from this insulation requirement. WSEC Section IECC Section Code Language Comment NA R Exception c 10/15/19 21+TB means R-15 R-10 continuous insulation on the interior or exterior of the home wall, or R-15 on the continuous insulation on the interior of the wall, or R-19 R-21cavity insulation plus a thermal break between the slab and the basement wall at the interior of the basement wall. 10/15/19 21+TB shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation R-value for continuous insulation on exterior below grade walls reduced to R-10 to reflect current WSEC requirements. R-15 value for continuous insulation on interior below grade walls was added to reflect IECC requirements.

8 on the interior or exterior of the home wall. 10/13 means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. TB means thermal break between floor slab and basement wall. NA R Exception d R-5 be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Climate Zones 1 through 3 for heated slabs. R-10 continuous insulation is required under heated (radiant) slab on grade floors. See R NA R Exception j For single rafter- or joist-vaulted ceilings, the insulation may be reduced to R-38. NA R Exception k Int. (intermediate framing) denotes standard framing 16 inches on center with headers insulated with a minimum of R-10 insulation. R-10 continuous insulation required under all heated slabs. Although footnote J does not currently appear in the table, it should be located in the Ceiling R- Value column to allow the reduction from R-49 to R-38 for vaulted ceilings. The IECC does not have a separate column for vaulted ceilings as the WSEC does. Defines what intermediate (int) framing is. NA R Exception l Log and solid timber walls with a minimum average thickness of 3.5 inches are exempt from this insulation requirement. Log wall exemption per state law.

9 CLIMATE ZONE FENESTRATION U-FACTOR SKYLIGHT U-FACTOR CEILING U-FACTOR TABLE R EQUIVALENT U-FACTORS a FRAME WALL U- FACTOR MASS WALL U-FACTOR b FLOOR U-FACTOR BASEMENT BELOW- GRADE WALL U-FACTOR CRAWL SPACE WALL U-FACTOR c except Marine and Marine (2 ) (2 ) (2 ) (2 ) 7 and a. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source or as specified in Section R b. When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.17 in Climate Zone 1, 0.14 in Climate Zone 2, 0.12 in Climate Zone 3, in Climate Zone 4 except Marine, in Climate Zone 5 and Marine 4, and in Climate Zone 6through 8. Reserved c. Basement wall U-factor of in warm-humid locations as defined by Figure R301.1 and Table R WSEC Section IECC Section Code Language Comment NA TABLE R U-factors in Table have been modified to reflect the R-values in Table Note that below grade walls only have one U-factor. It is not required to calculate different wall areas of below grade walls based on depth below grade. Table 5-1 R The U-factors for typical construction assemblies are included in Appendix A. These values shall be used for all calculations. Where proposed construction assemblies are not represented in Appendix A, values shall be calculated in accordance with the ASHRAE Handbook of Language added to this section cites Appendix A. Appendix A contains default U-factors from WSEC Chapter 10.

10 Fundamentals using the framing factors listed in Appendix A where applicable Table 5-1 R When using REScheck, the U-factors calculated by the software based on component R-value descriptions are acceptable. For the base building UA calculation, the maximum glazing area is 15% of the floor area R Loose insulation in attic spaces. Open-blown or poured loose fill insulation may be used in attic spaces where the slope of the ceiling is not more than 3 feet in 12 and there is at least 30 inches of clear distance from the top of the bottom chord of the truss or ceiling joist to the underside of the sheathing at the roof ridge. Language was added with a 15% maximum glazing area for the target house when using the Total UA Alternative (Component Performance). 15% is the glazing percentage in RCW 19.27A. Language from WSEC added for clarity when blowing in attic insulation Tables 6-1 & 6-2 R Where Section R would require insulation levels above R-30 and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation for such roof/ceiling assemblies shall be R-30. This reduction of insulation from the requirements of Section R shall be limited to 500 square feet (46 m2) or 20 percent of the total insulated ceiling area, whichever is less. This reduction shall not apply to the U-factor alternative approach in Section R and the total UA alternative in Section R R Floor insulation shall be installed to maintain permanent contact with the underside of the subfloor decking. Insulation supports shall be installed so spacing is no more than 24 inches on Language deleted. This language was eliminated from the WSEC in the 2009 Edition. R-38 vaults are required. WSEC language added for clarification of insulation support requirements

11 center. Foundation vents shall be placed so that the top of the vent is below the lower surface of the floor insulation. Exceptions: 1. When foundation vents are not placed so that the top of the vent is below the lower surface of the floor insulation, a permanently attached baffle shall be installed at an angle of 30 from horizontal, to divert air flow below the lower surface of the floor insulation. 2. Substantial contact with the surface being insulated is not required in enclosed floor/ceiling assemblies containing ducts where full depth insulation is installed between the duct and the exterior surface R Below-grade exterior wall insulation used on the exterior (cold) side of the wall shall extend from the top of the below-grade wall to the top of the footing and shall be approved for below-grade use. Above-grade insulation shall be protected. Insulation used on the interior (warm) side of the wall shall extend from the top of the below-grade wall to the below-grade floor level and shall include R-5 rigid board providing a thermal break between the concrete wall and the slab R The entire area of a radiant slab shall be thermally isolated from the soil with a minimum of R-10 insulation. The insulation shall be an approved product for its intended use. If a soil gas control system is present below the radiant slab, which results in increased convective flow IECC language deleted and WSEC added for clarity WSEC insulation requirements for heated slabs added.

12 below the radiant slab, the radiant slab shall be thermally isolated from the sub-slab gravel layer. R-10 radiant slab insulation is required for all compliance paths. NA R Crawl space walls. As an alternative to insulating floors over crawl spaces, crawl space walls shall be permitted to be insulated when the crawl space is not vented to the outside. The radon control provisions of Appendix F of the International Residential code shall also apply to all buildings constructed using this provision. Crawl space wall insulation shall be permanently fastened to the wall and extend downward from the floor to the finished grade level and then vertically and/or horizontally for at least an additional 24 inches (610 mm). Exposed earth in unvented crawl space foundations shall be covered with a continuous Class I vapor retarder in accordance with the International Building Code or International Residential Code, as applicable. All joints of the vapor retarder shall overlap by 6 inches (153 mm) and be sealed or taped. The edges of the vapor retarder shall extend at least 6 inches (153 mm) up the stem wall and shall be attached to the stem wall. NA R Sunroom insulation. All sunrooms enclosing conditioned space shall meet the insulation requirements of this code. Exception: For sunrooms with thermal isolation, and enclosing conditioned space, the following exceptions to the insulation requirements of this code shall apply: IECC language deleted. Unvented crawl spaces are not prescriptively allowed. These sections deleted. Less stringent than the WSEC

13 1. The minimum ceiling insulation R-values shall be R-19 in Climate Zones 1 through 4 and R- 24 in Climate Zones 5 through 8; and 2. The minimum wall R-value shall be R-13 in all climate zones. Wall(s) separating a sunroom with a thermal isolation from conditioned space shall meet the building thermal envelope requirements of this code R The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding 5 air changes per hour in Climate Zones 1 and 2, and 3 5 air changes per hour in Climate Zones 3 through 8. Testing shall be conducted with a blower door at a pressure of 0.2 inches w.g. (50 Pascals). Where required by the code official, testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope. Once visual inspection has confirmed the presence of a gasket (see Section 502.4), operable windows and doors manufactured by small business shall be permitted to be sealed off at the frame prior to the test. Air leakage testing will be based on air changes per hour and not specific leakage area as required by the WSEC. The IECC maximum leakage rate is 3 ACH50. This was changed to 5 ACH50 during the WSEC/IECC integration process. Additional language was added from the WSEC for small window manufacturers R Heat pumps having supplementary electricresistance heat shall have controls that, except during defrost, prevent supplemental heat WSEC language added for clarity. IECC does not cite outdoor temperatures

14 operation when the heat pump compressor can meet the heating load R All heat pumps installed under this section shall include the capability to lock out the supplementary heat based on outdoor temperature. This control shall have a maximum setting of 40 F. At final inspection, the lock out control shall be set to 32 F or less. Unitary air cooled heat pumps shall include controls that minimize supplemental heat usage during startup, set-up, and defrost conditions. These controls shall anticipate need for heat and use compression heating as the first stage of heat. Controls shall indicate when supplemental heating is being used through visual means (e.g., LED indicators). Heat pumps equipped with supplementary heaters shall be installed with controls that prevent supplemental heater operation above 40 F. At final inspection the auxiliary heat lock out control shall be set to 35 F or less. Where the primary heating system is a forced-air furnace, at least one thermostat per dwelling unit shall be capable of controlling the heating and cooling system on a daily schedule to maintain different temperature set points at different times of the day. The thermostat shall allow for, at a minimum, a 5-2 programmable schedule (weekdays/ weekends) and be capable of providing at least two programmable setback periods per day. This thermostat shall include the capability to set back or temporarily operate the WSEC language added for clarity and provide exceptions

15 system to maintain zone temperatures down to 55 F (13 C) or up to 85 F (29 C). The thermostat shall initially be programmed with a heating temperature set point no higher than 70 F (21 C) and a cooling temperature set point no lower than 78 F (26 C). The thermostat and/or control system shall have an adjustable deadband of not less than 10 F. EXCEPTIONS: 1. Systems controlled by an occupant sensor that is capable of shutting the system off when no occupant is sensed for a period of up to 30 minutes. 2. Systems controlled solely by a manually operated timer capable of operating the system for no more than two hours R Supply ducts Ducts in attics shall be insulated to a minimum of R-8. All other ducts shall be insulated to a minimum of R-6. Exception: Ducts or portions thereof located completely inside the building thermal envelope. Ducts located in crawl spaces do not qualify for this exception. WSEC language added to apply to all ducts. R-8 required for all ducts outside the conditioned space R Reference Standard-33 added from WSEC to standardize duct testing protocols. Leakage to exterior test added as a compliance option. Ducts located in crawlspaces, whether vented or unvented are not exempt from testing requirements R IECC language deleted to minimize confusion. All

16 hot water pipes are required to be insulated to R R All electric water heaters in unheated spaces or on concrete floors shall be placed on an incompressible, insulated surface with a minimum thermal resistance of R-10. Pool pump motors may not be split-phase or capacitor start-induction run type. Two-Speed Capability: 1. Pump motors: Pool pump motors with a capacity of 1 hp or more shall have the capability of operating at two or more speeds with low speed having a rotation rate that is no more than onehalf of the motor's maximum rotation rate. 2. Pump controls: Pool pump motor controls shall have the capability of operating the pool pump with at least two speeds. The default circulation speed shall be the lowest speed, with a high speed override capability being for a temporary period not to exceed one normal cycle. Pump Operation: Circulating water systems shall be controlled so that the circulation pump(s) can be conveniently turned off, automatically or manually, when the water system is not in operation. WSEC language added for water heaters installed in unheated spaces or on slabs. WSEC language added for residential pool pumps.

17 505 R404.1 Language changed from 50% to 75% A minimum of percent of the lamps in of installed lamps instead of permanently installed lighting fixtures luminaires (fixtures) per IECC luminaires lamps in lighting fixtures shall be requirements. Exterior lighting high-efficacy lamps or luminaires. A minimum requirements deleted. of 75 percent of the permanently installed lighting fixtures shall contain only high efficacy lamps. Chapter 4 R405 Exception: Low-voltage lighting shall not be required to utilize high-efficiency lamps. R Lighting equipment (Mandatory). Fuel gas lighting systems shall not have continuously burning pilot lights. R404.2 Exterior Lighting: Luminaires providing outdoor lighting and permanently mounted to a residential building or to other buildings on the same lot shall be high efficacy luminaires. EXCEPTIONS: 1. Permanently installed outdoor luminaires that are not high efficacy shall be allowed provided they are controlled by a motion sensor(s) with integral photocontrol photosensor. 2. Permanently installed luminaires in or around swimming pools, water features. Compliance based on simulated energy performance requires that a proposed residence (proposed design) be shown to have an annual energy cost consumption based on site energy expressed in Btu and Btu per square foot of conditioned floor area as Compliance with this approach is changed from energy cost to consumption. Required reductions of energy use are listed for the three size categories listed in R406. These reductions

18 follows: 1. For structures less than 1,500 square feet of conditioned floor area, the annual energy consumption shall be that is less than or equal to 97 percent of the annual energy cost consumption of the standard reference design. 2. For structures 1,500 to 5,000 square feet of conditioned floor area, the annual energy consumption shall be no more than percent of the standard reference design. 3. For structures over 5,000 square feet of conditioned floor area, the annual energy consumption shall be no more than percent of the standard reference design. Energy prices shall be taken from a source approved by the code official, such as the Department of Energy, Energy Information Administration s State Energy Price and Expenditure Report. Code officials shall be permitted to require time-of-use pricing in energy cost calculations. Exception: The energy use based on source energy expressed in Btu or Btu per square foot of conditioned floor area shall be permitted to be substituted for the energy cost. The source energy multiplier for electricity shall be The source energy multiplier for fuels other than electricity shall be 1.1. reflect the credits necessary from R406.

19 Chapter 9 R406 Language added to clearly define the This section establishes options for additional scope of this section criteria to be met for one and two-family dwellings and townhouses, as defined in Section of the International Residential Code to demonstrate compliance with this code. Chapter 9 R406 Each dwelling unit in one and two-family dwellings and townhouses, as defined in Section of the International Residential Code demonstrating compliance by meeting those sections identified as prescriptive shall develop one credit from Table R shall comply with sufficient options from Table R406.2 so as to achieve the following minimum number of credits: 1. Small Dwelling Unit: 0.5 points Dwelling units less than 1500 square feet in conditioned floor area with less than 300 square feet of fenestration area. Additions to existing building that are less than 750 square feet of heated floor area. 2. Medium Dwelling Unit: 1.5 points All dwelling units that are not included in #1 or #3. 3. Large Dwelling Unit: 2.5 points Dwelling units exceeding 5000 square feet of conditioned floor area. The drawings included with the building permit application shall identify which options have This section requires credits from the options listed in this section. Small dwelling units are now not exempt and require.5 credits. Medium dwelling units require 1.5 credits previously 1.0 credit. Large dwelling units require 2.5 credits- previously 2.0 credits.

20 been selected and the point value of each option, regardless of whether separate mechanical, plumbing, electrical, or other permits are utilized for the project. Chapter 9 (3a) Table R406.2 (1a) EFFICIENT BUILDING ENVELOPE 1a: Language changed for clarification Chapter 9 (3b) Table R406.2 (1b) Prescriptive compliance is based on Table R with the following modifications: Window Fenestration U.= 0.28 Floor R-38, Slab on grade R-10 full perimeter and under entire slab, Below grade slab R-10 full perimeter and under entire slab. or Compliance based on Section R : Reduce the Total UA by 5%. EFFICIENT BUILDING ENVELOPE 21b: Prescriptive compliance is based on Table R with the following modifications: Window Fenestration U.= 0.25 and Wall R-21 plus R-4 and R-38 Floor R-38, Basement wall R-21 int plus R-5 ci, Slab on grade R-10 perimeter and under entire slab full, Below grade slab R-10 perimeter and under.5 Credits Language and format changed for clarity 1.0 Credits

21 entire slab full, and Chapter 9 (3c) Chapter 9 (4a) R406.2 (1c) R406.2 (2a) R-21 plus R-5 Below grade basement walls. or Compliance based on Section R : Reduce the Total UA by 15%. SUPER-EFFICIENT BUILDING ENVELOPE 31c: Prescriptive compliance is based on Table 6-1, Option IIIR with the following modifications: Window Fenestration U.= 0.22 and Ceiling and single-rafter or joist-vaulted R-49 advanced Wood frame wall R-21 int plus R-12ci Floor R-38, Basement wall R-21 int plus R-12 ci Slab on grade R-10 perimeter and under entire slab full, Below grade slab R-10 perimeter and under entire slab full Below grade basement walls R-21 plus R-12and R-49 Advanced ceiling and vault. or Compliance based on Section R : Reduce the Total UA by 30%. AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION 2a: Language and format changed for clarity. 2.0 Credits ACH changed to 4.0ACH50 to correct an error in the previous code

22 Chapter 9 (4b) R406.2 (2b) Envelope leakage reduced to 2.5 ACH. Building envelope tightness shall be considered acceptable when tested air leakage is less than 2.5 ACH when tested with a blower door at a pressure difference of 50 PA. Testing shall occur after rough in and after installation of penetrations of the building envelope, including penetrations for utilities, plumbing, electrical, ventilation, and combustion appliances Compliance based on R : Reduce the tested air leakage to 4.0 air changes per hour maximum. and All whole house ventilation requirements as determined by Section M1508 M of the Washington State International Residential Code shall be met with a heat recovery ventilation system in accordance with Section M of that Code high efficiency fan (maximum 0.35 watts/cfm), not interlocked with the furnace fan. Ventilation systems using a furnace including an ECM motor are allowed, provided that they are controlled to operate at low speed in ventilation only mode. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify ADDITIONAL AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION 2b: Envelope leakage reduced to 2 ACH. Building envelope tightness shall be considered version.ach50 is used instead of SLA. This credit now does not require a heat recovery ventilator. An exhaust type ventilation system or a system integrated with the furnace may be used as long as they meet the efficiency requirements..5 Credits This option requires a maximum leakage rate of 2.0ACH50. In addition a heat recovery ventilator with sensible heat recovery efficiency of

23 acceptable when tested air leakage is less than 2 ACH when tested with a blower door at a pressure difference of 50 PA. Testing shall occur after rough in and after installation of penetrations of the building envelope, including penetrations for utilities, plumbing, electrical, ventilation, and combustion appliances Compliance based on Section R : Reduce the tested air leakage to 2.0 air changes per hour maximum. 70%. 1.0 Credits NA R406.2 (2c) and All whole house ventilation requirements as determined by Section M1508 M of the Washington State International Residential Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.70 in accordance with Section M of that Code. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the maximum tested building air leakage and shall show the heat recovery ventilation system AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION 2b: Compliance based on Section R : Reduce the tested air leakage to 1.5 air changes per hour maximum. and All whole house ventilation requirements as This option requires a maximum leakage rate of 1.5ACH50. In addition a heat recovery ventilator with sensible heat recovery efficiency of 85%. 1.5 Credits

24 determined by Section M of the International Residential Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of Chapter 9 (1a) Chapter 9 (1a) Chapter 9 (1b) R406.2 (3a) R406.2 (3b) R406.2 (3c) To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the maximum tested building air leakage and shall show the heat recovery ventilation system. HIGH EFFICIENCY HVAC EQUIPMENT 13a: Gas, propane or oil-fired furnace or boiler with minimum AFUE of 92 95%, or Air-source heat pump with minimum HSPF of 8.5. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. HIGH EFFICIENCY HVAC EQUIPMENT 23b: Air-source heat pump with minimum HSPF of 8.5. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. HIGH EFFICIENCY HVAC EQUIPMENT 2:HIGH Efficiency requirement of this option increased to 95% and credit reduced because of increased Federal furnace efficiency in May Credits Same as current code requirements 1.0 Credits This option adds water source heat pumps with a COP of 3.6 or higher

25 EFFICIENCY HVAC EQUIPMENT 3c: Closed-loop ground source heat pump; with a minimum COP of Credits Chapter 9 (1c) (3d) Chapter 9 (2) (4) or Open loop water source heat pump with a maximum pumping hydraulic head of 150 feet and minimum COP of 3.6 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. HIGH EFFICIENCY HVAC EQUIPMENT 3d: DUCTLESS SPLIT SYSTEM HEAT PUMPS, ZONAL CONTROL: In home where the primary space heating system is zonal electric heating, a ductless heat pump system shall be installed and provide heating to at least one zone of the housing unit. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM:1 All heating and cooling system components installed inside the conditioned space. All Language added for clarity 1.0 Credits Language added for clarity 1.0 Credits

26 combustion equipment shall be direct vent or sealed combustion. Chapter 9 (5a) (5a) Locating system components in conditioned crawl spaces is not permitted under this option. Electric resistance heat is not permitted under this option. Direct combustion heating equipment with AFUE less than 80% is not permitted under this option. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and shall show the location of the heating and cooling equipment and all the ductwork EFFICIENT WATER HEATING 5a: Water heating system shall include one of the following: Gas, propane or oil water heater with a minimum EF of or Electric Water Heater with a minimum EF of and for both cases All showerhead and kitchen sink faucets installed in the house shall meet be rated at 1.75 GPM or less. All other lavatory faucets Language added for clarity.5 Credits

27 shall be rated at 1.0 GPM or less.2 Chapter 9 (5b) R406.2 (5b) To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and shall specify the maximum flow rates for all showerheads, kitchen sink faucets, and other lavatory faucets HIGH EFFICIENCY EFFICIENT WATER HEATING 5b: Water heating system shall include one of the following: Gas, propane or oil water heater with a minimum EF of or Solar water heating supplementing a minimum standard water heater. Solar water heating will provide a rated minimum savings of 85 therms or 2000 kwh based on the Solar Rating and Certification Corporation (SRCC) Annual Performance of OG-300 Certified Solar Water Heating Systems. or Electric heat pump water heater with a minimum EF of 2.0 and meeting the standards of NEEA s Northern Climate Specifications for Heat Pump Water Heaters. or Water heater heated by ground source heat This option includes specifications for a heat pump water heater and adds water heating from ground source heat pump systems. 1.5 Credits

28 pump meeting the requirements of Option 3c. Chapter 9 (8) R406.2 (6) To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and, for solar water heating systems, the calculation of the minimum energy savings RENEWABLE ELECTRIC ENERGY: For each 1200 kwh of electrical generation provided annually by on-site wind or solar equipment a 0.5 credit shall be allowed, up to 3 credits. Generation shall be calculated as follows: For solar electric systems, the design shall be demonstrated to meet this requirement using the National Renewable Energy Laboratory calculator PVWATTs. Documentation noting solar access shall be included on the plans. For wind generation projects designs shall document annual power generation based on the following factors: The wind turbine power curve; average annual wind speed at the site; frequency distribution of the wind speed at the site and height of the tower. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall show the photovoltaic or wind turbine equipment type, provide documentation of solar and wind access, and Language added for clarity.5 Credits per 1200 kwh

29 include a calculation of the minimum annual energy power production.