2009 Washington State Energy Code Residential Sections

2009 Washington State Energy Code Residential Sections

2009 Washington State Energy Code Residential Sections Gary Nordeen, Luke Howard, Emily Salzberg (360) 956-2042 [email protected] Produced with funding from: 1 Washington State University Energy Program Website WSEC text Builders Field Guide Prescriptive and Component Performance Worksheets Heating System Sizing worksheets

Duct Testing Affidavit Duct Testing Standard Air Leakage Testing Duct Testing Calculator www.energy.wsu.edu/code 2 Energy Code Support Residential

Washington State University Extension Energy Program 360-956-2042 [email protected] www.energy.wsu.edu/code Gary Nordeen, Luke Howard, Emily Salzberg, Andy Gordon Non-residential Northwest Energy Efficiency Council Lisa Rosenow 206-624-0283

[email protected] www.neec.net 3 WSEC Layout (101.3) Chapters 1-10 are for single family residential bldgs Chapters 11-15 are for commercial and multifamily bldgs. Shared Chapters Chapter 2 Definitions Chapter 7 - Standards Chapter 10 Default U-Factors 4 Alterations: Building Envelope (101.3.2.5)

Insulation levels in remodeled buildings do not have to meet current requirements but framing cavities must be filled to their full depth when exposed. 2 X 4 walls must be insulated to R-15 2 X 6 walls must be insulated to R- 21 Roof/Ceiling Assemblies need required space for ventilation 5 Furnace Replacement (101.3.2.6) Duct sealing and testing is required when a space conditioning system is altered including Air handler replacement Outdoor condensing unit (AC or HP) Cooling or heating coils

Furnace heat exchanger 6 Duct Sealing (existing houses) Max. leakage rates: 8% CFA for Total duct leakage 6% CFA for Leakage to exterior Or Post installation duct leakage reduced by 50% Or Verification by 3rd party inspector that all accessible leaks have been sealed

Duct testing standards are posted at: www.energy.wsu.edu/code 7 Exceptions: If all ductwork is contained within the conditioned space or less than 40 lineal feet outside conditioned space Ducts that have been previously tested Ducts containing asbestos 8 Certificate (105.4) Posted within 3 of electrical panel

Insulation Windows HVAC efficiency Duct leakage Air leakage Certificate is posted at: www.energy.wsu.edu/code See CD or website

9 Chapter 2 44 New Definitions Added 10 Chapter #3 Design Conditions Table 3-1 added to this chapter Lists 100+ locations in Washington Lists Outdoor design temperatures for heating and cooling 11

Three Building Envelope Compliance Methods Prescriptive: Chapter 6 Cook Book Component Performance: Chapter 5 Whole Building UA Trade off Most other requirements Systems Analysis: Chapter 4 Annual energy budget Sophisticated analysis required 12 Systems Analysis Chapter 4 Same procedure as always Model Target (Code) house

Model Proposed house Proposed house must be at least 8% more efficient than the Target house. 13 Ceilings: Two Types Attics (R-38 ADV framed or R-49) Including Standard and Scissor Trusses Single Rafter Joist (R-38) 14 Advanced Framed Roof 15

Walls Climate Zone 1 R-21 for all paths All paths are intermediate framing (requires R-10 insulated headers) Climate Zone 2 R-21 for 12% glazing or less R-19+R-5 for other paths 16 R-21 int. Include Insulated Headers All Climate Zone 1 Prescriptive Paths require

Intermediate Framing 17 18 Substantial contact not required in this application (502.1.4.7 Exception) Floor/Ceiling assemblies onlynot for crawl spaces 19 20 Windows

Climate Zone 1 13% or less = U-.34 25% or less = U-.32 Unlimited = U-.30 Climate Zone 2 12% or less = U-.32 15% or less = U-.32 Unlimited = U-.30 21 Area Weighted U-factors Area weighted U-factor allowed for single above grade components (602.7.2) Example of Area Weighted U-Value Calculation: Window #1 area 10 ft2 U = .34 U x A = 3.4

Window #2 area 15 ft2 U = .28 U x A = 4.2 Total area 25 ft2 Total U x A = 7.6 Area weighted average 7.6/25 = 0.30 22 Exception for Ventilated Attics Unvented, conditioned attics are allowed under certain conditions See CD or website 23 Unvented Attic Criteria Unvented attic contained completely within

the building thermal envelope. NO vapor retarders installed at ceiling level. See publication on CD or website for specific details 24 Building Air Leakage Testing (502.4.5) Air leakage testing required for new houses Blower door equipment is needed Maximum leakage allowed: .00030 SLA

(SLA = Specific Leakage Area) See CD or website 25 Calculating SLA (Specific Leakage Area) SLA = (CFM50 X .055) / (CFA X 144) SLA = (1790 X .055) / (2240 X 144) SLA = 98.45 / 322,560 SLA = .00030 HVAC Controls (503.8) Primary space conditioning systems in each dwelling unit

require a programmable thermostat Each additional system within a dwelling unit must have an adjustable thermostat Programmable stat must have a 5-2 schedule (minimum) 27 Heat Pump Controls (503.8.3.5) Heat Pumps with supplemental electric resistance heaters shall have controls that: Prevent supplementary heater operation when the load can be met by the heat pump alone Supplementary heat lock out based on outdoor temp.

Max. setting of 400F Set to 320 or less at final inspection 28 Duct Testing (503.10.2) Ducts located outside the conditioned space must be tested Maximum leakage rates specified in RS-33 See CD or website 29 Duct Testing Standards

Rough-In Testing Targets: Total leakage 6% of the CFA at 25 Pa OR Total leakage 4% of the CFA at 25 Pa if air handler has not been installed Post Construction Testing Targets: Total leakage 8% of the CFA at 25 Pa OR Leakage to exterior 6% of the CFA at 25 Pa Duct Testing Exceptions: Duct tightness test is not required if: The air handler and all ducts are

located within conditioned space. or The furnace is a non-condensing appliance in an unconditioned space with a maximum of 6 feet of ductwork in the unconditioned space. Related HVAC Code Changes: (503.10.1) Ducts cannot displace required insulation Building cavities cannot be used as ducts Indoor Lighting (505.1) 50% of all indoor luminaires

(fixtures) shall be high efficacy 33 Outdoor Lighting GU 24 Base 35 Lighting: Linear Fluorescent Fixtures 505.3 Linear Fluorescent Fixtures: This rule applies to typical fluorescent tube

fixtures Linear fluorescent fixtures must be fitted with T-8 (1 diameter) or smaller lamps (but not T 10 or T-12 lamps) 1 max Residential 36 Table 6-1 Prescriptive Requirements for Single Family Residential Climate Zone 1 Option

Glazing % Vertical Glazing Overhead Glazing Door U-Factor Ceiling Vaulted Ceiling

Wall Above grade Wall (interior) Below grade Wall (exterior) Below grade Floor

Slab On grade I. 13% .34 .50 .20 R-49 or

R-38 ADV R-38 R-21 INT R-21 TB R-10 R-30 R-10 II.

25% .32 .50 .20 R-49 or R-38 ADV R-38 R-21 INT R-21 TB

R-10 R-30 R-10 III. Unlimited .30 .50 .20

R-49 or R-38 ADV R-38 R-21 INT R-21 TB R-10 R-30 R-10

See CD 37 Table 6-2 Prescriptive Requirements for Single Family Residential Climate Zone 2 Option Glazing % Vertical Glazing Overhead Glazing

Door U-Factor Ceiling Vaulted Ceiling Wall Above grade Wall (interior) Below

grade Wall (exterior) Below grade Floor Slab On grade I. 12%

.32 .50 .20 R-49 or R-38 ADV R-38 R-21 INT R-21 TB

R-12 R-30 R-10 II. 15% .32 .50 .20

R-49 or R-38 ADV R-38 R-19+R-5 R-21 TB R-12 R-30 R-10 III.

Unlimited .30 .50 .20 R-49 or R-38 ADV R-38 R-19+R-5 R-21 TB

R-12 R-30 R-10 See CD 38 Energy Credits Chapter 9 Dwelling units must choose one credit from the

following options 39 High Efficiency HVAC Equipment Gas, propane or oil furnace. Min. AFUE 92% 1.0 credit Or Air-source heat pump Min. HSPF 8.5

1.0 credit Or Ground Source Heat Pump Min. COP 3.3 2.0 credits 40 High Efficiency HVAC Equipment Ductless split system heat pump House must have electric zonal as primary heating system Ductless heat pump shall provide heating to

at least one zone 1.0 credit 41 High Efficiency HVAC Distribution Components All heating and cooling components located inside the conditioned space Must be direct vent or sealed combustion Components located in a conditioned crawl space are not allowed Electric resistance heat is not allowed Direct combustion heating equipment (i.e. room heaters, fireplaces, etc.) with an AFUE less than

80% not allowed 1.0 credit 42 Efficient Building Envelope #1 Prescriptive compliance based on Table 6-1 (Climate Zone 1) with modifications: Windows U-.28 Floor R-38 Slab-on-grade R-10 fully insulated Below grade slab R-10 fully insulated or Component Performance (Zones 1 and 2) Reduce Target UA 5%

.5 credit 43 Efficient Building Envelope #2 Prescriptive compliance based on Table 6-1 (Climate Zone 1) with modifications: Windows U-.25 Walls R-21 + R-4 Floor R-38 Slab-on-grade R-10 fully insulated Below grade slab R-10 fully insulated R-21+R-5 below grade basement walls or Component Performance (Zones 1 and 2) Reduce Target UA 15% 1.0 credit

44 Super Efficient Building Envelope #3 Prescriptive compliance based on Table 6-1 (Climate Zone 1) with modifications: Windows U-.22 Walls R-21+R-12 Floor R-38 Slab-on-grade R-10 fully insulated Below grade slab R-10 fully insulated R-21+R-12 below grade basement walls or Component Performance (Zones 1 and 2) Reduce Target UA 30% 2.0 credits

45 Air Leakage Control and Efficient Ventilation Air Leakage rate reduced to .00020 SLA and The Whole House Ventilation System is a heat recovery ventilator .5 credit

46 Additional Air Leakage Control and Efficient Ventilation Air Leakage rate reduced to .00015 SLA and The Whole House Ventilation System is a heat recovery ventilator 1.0 credit 47

Efficient Water Heating Gas, propane or oil water heater Min. EF .62 Electric water heater Min. EF .93 and Low flow faucets Shower and Kitchen sink = 1.75 GPM All other lav. Faucets = 1.0 GPM .5 credit

48 High Efficiency Water Heating Gas, propane or oil water heater Min. EF .82 Solar water heating (supplemental) Min savings 2000 kWh/year Electric heat pump water heater Min. EF 2.0 1.5 credits

49 House size credits and debits Dwelling units less than 1500 ft2 Max. window and door area is 300 ft2 Includes additions less than 750 ft2 1.0 credit Dwelling units 2 exceeding 5000 ft

-1.0 credit 50 Renewable Electric Energy Solar or wind .5 credits per 1200 kWh of generation provided annually 3.0 credits max Documentation method outlined in the code 51

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