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Residential Era�r�/ � Ve����ation 1N�rksh�et � Additiona! Energy Efficiency Requirements
<br /> Per Table R406.2 of the Washington State Energy Code,each dwelling unit in a residential building must achieve the following
<br /> ' Whole-House Ventitat'son minimum number of credits.
<br /> � Select one of the foilowing methods.
<br /> Type/Descriptian Credits Require
<br /> � A. Fresh air will be circulated by the central forced air furnace.The furnace must have afresh air intake duct and the blower Smalf DweEling Unit 1.5 credits
<br /> must be activated by a timer to circulate air a total of 8 hoursdaify. • Dwelling units less than 1500 square feet in conditioned fioor area with less than 300 square feet of
<br /> , ❑ B. Fresh air wiEl be supplied by wall or window vent ports in each bedroom,kitchen,living raom and other habitable rooms fenestration area.
<br /> along with a whole-house exhaust fan.The exhaust fan,which usually does double duty as a laundry or bathroom fan, and must • Additions to existing building more than 500 square feet of heated floor area but less than 1500 square feet.
<br /> be controlled by a timer set to operate according to the fan sizes and time schedules below.The table below assumes a Medium Dwelling Unit 3.5 cre its
<br /> residence of 3000 square feet or less. o Dwelling units with more than 1500 sq ft and less than 5000 sq ft of conditioned floor area
<br /> � � ' • Additions to existing building with 1500 square feet or more of heated floor area.
<br /> Continuous Operation . 12 Hours/Day
<br /> _: � . _ _.
<br /> ' 1 bedroom : 45 cfm ^ 90 cfm Exception: Dwelling units serving R-2 occupancies require 2,5 credits.
<br /> 2-3 bedrooms � 60 cfm ° 120 cfm Large Dwelling Unit 4.S credits
<br /> 4-5 bedrooms 75 cfm 150 cfm • Uwelfing units with 5000 square feet or more of conditioned f�oor area.
<br /> � � Exception: Dwelling units serving R-2 occupancies require 2.S credits.
<br /> ❑ C.A heat-recovery ventilation system with minimum CFM flow rates as shown in option B. Additions af 500 square feet or iess 0.5 credits
<br /> � Source-Specific Exhaust Ventilation & Fan Efficiency
<br /> Required in each kitchen, bathroom,water closet compartment, laundry room, indoor swimming pool,spa and other rooms where The fallowing options are commonfy chosen to achieve the required number of credits.See section R406 for complete fist of
<br /> _ water vapor or cooking odor is produced. (!RC M-1507.4) Fan efficiency from WAC 51-11R—Table R403.6.1. options.
<br /> 1 • Option 3a(1.0 Credits)—A gas, propane or oil-fired furnace with a min AFUE of 94%.
<br /> Minimum Source-Specific Ventilation Capacity Requirements • O tion 3 1.o Cre its —Duct ess Sp it System Heat Pump ocate in t e main zone o t e addition.
<br /> Bathrooms—Utility Rooms Kitchens In-line fan p, • Option 5a(0.5 Credits —Al) new s owerhea an kitc en sink aucets rate at 1.75 GPM or ess an a new avatory
<br /> Intermittently operating 50 cfm 100 cfm faucets rated .
<br /> Continuous operation 20 cfm 25 cfm • Option 5b(1.0 Credits}—A gas, propane or oil-fired water heater with a min Efi of 0.74. .
<br /> • Option Sc(1.5 Creditsj—A gas, propane or oil-fired water heater with a min EF of 0.91
<br /> Air Flow Rate Minimum(cfm) 10 90 Any Any
<br /> Minimum Efficacy(cfm/watt} 1.4 cfm/watt 2.8 cfm/watt 2.8 cfm/watt 2.8 cfrr�/watt The drawings included with the building permit application shafl identify which options have been selected and the point value of
<br /> Air Flow Rate Maximum(cfm} > o Any Any Any each option, regardless of whether separate mechanical, plumbing,electricaf, or other permits are utilized for the project.
<br /> � � Other Code Requirements
<br /> � tnsulation and Windows Section 502.4.5 of the Energy Code requires that the building envelope be tested(normal(y referred to as a"b(ower door test")to
<br /> Prescriptive energy code compliance for Climate Zone Marine 4: determine that air leakage is within acceptable levels.A ieakage of.00030 SLA measured at 50 pascals is considered acceptable.
<br /> Sealing of doors,windows,ducts or registers is not allowed during testing.
<br /> Fenestration 1 Ceiling Vaulted Wood Framed Mass Wall Befow-Grade Framed Slab R-Value
<br /> Component Vertical Overhead
<br /> w/att�c ceiling wal�(mt.)2 (Above grade) wall z� Floor &Depth Section 503.10.2 requires leakage testing of the mechanical ducts to insure that the ducts are sealed.Testing may occur at rough-in
<br /> or post-construction.Testing must comply with standard RS-33. lndividuals performing the test must be approved or certified by the
<br /> Prescriptive U.0.30 U.0.5U R-49 R-38 R-21 min. R-21 min. R-10/15/21 R-30 R-10 min. Washington State University Energy O�ce or approved other agency. .
<br /> Value max. max. min. min. Int.+76 min. 2'depth
<br /> Section 505.1 requires that 75%of all furrtinaires(lights and tamps)be high efficiency.
<br /> 1.Fenestration isdefinedasskylights,roofwindows,verticalwindows(fixed ormoveable},opaquedoors,glazeddoors,glazedblockandcombination opaque/glazed SeCtiott 1Q5.4 requires that a certificate be posted within three feet of the electricaf panel,completed by the builder or design
<br /> doors.Fenestration includes products with glassand non-glassglazingmaterials.
<br /> � 2.Int.(intermediateframing)denotesstandardframingl6"o.c.withfieadersinsulatedwithaminimum£t-10insulation. professional,and include the following information. R-values for ceiling,w211s,floot'S,fourtdation,U-factors for windows,t e type
<br /> s."10/15/21+TB"means R-10 continuous insulation on the exterior of the wall,or R-15 on the continuous insulation on the interior of the wall,or R-21 cavity and efficiency of heating/cooling equipment,duct leakage rates from the duct testing,and the air leakage rates from the blower
<br /> insulation plus a thermal break between the slab and the basement wall at the interior of the basement wall."10/15/21+TB"shall be permitted to be met with R-13 door testing.A certificate will be provided for your use at time of permit issuance.
<br /> cavity insulation on the interior of the basement waN plus R-5 continuous insulation on the interior or exterior of the wall."TB"means thermal break between ffoor
<br /> slab and basement walL
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<br /> NOWARD F. PATTERSOht � /'+
<br /> A.l.B.D. 7T72 BUTLEfi HILL RD ��■..
<br /> BURLINGTON WA 98233 �•�•s•D.C.
<br /> ��p4j� 360-757:0685._ - .•�� "
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<br /> �B�p� howdesigns@wavecable.com '�
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