2009 Washington State Energy Code Residential Sections · 1 2009 Washington State Energy Code...
Transcript of 2009 Washington State Energy Code Residential Sections · 1 2009 Washington State Energy Code...
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2009 Washington State Energy Code
Residential Sections
Gary Nordeen, Luke Howard, Emily Salzberg
(360) 956-2042
Produced with funding from:
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Washington State Energy Code text
Builders Field Guide
Prescriptive and Component Performance Worksheets
Heating System Sizing worksheets
Duct Testing Affidavit
Duct Testing Standard
Air Leakage Testing
www.energy.wsu.edu
Washington State University
Energy Program Website
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Energy Code Support
Residential
Washington State University Energy Program
360-956-2042
www.energy.wsu.edu/code
Gary Nordeen, Luke Howard, Emily Salzberg, Tanya Beavers
Non-residential
Northwest Energy Efficiency Council
Lisa Rosenow
206-624-0283
www.neec.net
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WSEC
Make sure you’re using the correct version!
2009 Washington State Energy Code
Chapter 51-11 WAC
January 1st, 2011
Free code text download at:
www.energy.wsu.edu/code/
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WSEC Layout (101.3)
Chapters 1-10 are for single family residential bldgs
Chapters 11-15 are for commercial and multi-family bldgs.
Shared Chapters
Chapter 2 – Definitions
Chapter 7 - Standards
Chapter 10 – Default U-Factors
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Definition: Single Family Residential
See IRC; R101.2, Scope for further details
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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
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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
*Current emergency rule in effect until the end of
August requires testing but no sealing
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Duct Testing (existing houses)
Compliance options for field verification 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
Emergency rule requires test result to be
documented on the affidavit and submitted to the
building department and home owner
Duct testing standards are posted at:
www.energy.wsu.edu/code
See website
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Exceptions:
Ducts with less than 40 lineal feet in
unconditioned spaces
Ducts that have been previously tested
Ducts containing asbestos
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Duct Testing Affidavit (Existing Const.)
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Certificate (105.4)
Posted within 3’ of
electrical panel
Insulation
Windows
HVAC efficiency
Duct leakage
Air leakage
Certificate posted at:
www.energy.wsu.edu/code
See website
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Chapter 2 – Definitions
44 new definitions added
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Definition: NOMINAL R-VALUE:
The thermal resistance of insulation alone as
determined in accordance with the U.S. Federal
Trade Commission R-value rule.
Picture here
www.ftc.gov/bcp/rulemaking/rvalue/index.shtml
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Chapter #3 Design Conditions
Table 3-1 added to this
chapter
Lists 100+ locations in
Washington
Lists Outdoor design
temperatures for heating
and cooling
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Three Energy Code Compliance Options
Prescriptive
Component Performance
Systems Analysis
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Prescriptive: Chapter 6
Option II. 25% glazing
.32 U-factor windows
R-21 INT walls
R-38 ADV ceiling
R-30 floor
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Component Performance: Chapter 5
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Building Envelope UA Trade-Off
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Systems Analysis – Chapter 4
Same procedure as always
Model Target (Base Code) house
Model Proposed house
Proposed house must be at least 8% more
efficient than the Target house.
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Systems Analysis – Chapter 4
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Insulation (502.1.4.1)
Substantial contact with the
surface being insulated is
required
There is an exception for
floor/ceiling assemblies
Installed to maintain uniform
R-values
Installed so R-value mark can
be seen by the inspector
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Substantial contact not required in this
application (502.1.4.7 Exception)
Floor/Ceiling
assemblies only-
not for crawl spaces
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Attic Access (502.1.4.4)
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Weather stripping reduces air leakage
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Pull-down ladder access/knee wall
access
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Ceilings: Two Types
Attics (R-38 ADV framed or R-49)
Including Standard and Scissor Trusses
Single Rafter Joist (R-38)
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Advanced Framed Roof
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Maintain a
minimum 1”
airspace
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Blown-in Ceiling Insulation
Fiberglass
Cellulose
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Insulation Markers (502.1.4.1)
Required for blown-in
insulation
Placed every 300 Ft2
Faced toward attic
access
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Cellulose Depth & Bag Count
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Walls (502.1.4.6)
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
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R-21 INT Includes Insulated Headers
All Climate Zone 1
Prescriptive Paths
require Intermediate
Framing
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Above Grade Walls
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Mold may grow here
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If six studs are
good…
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Nine must be
better.
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Stapling Insulation (502.1.6.6)
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53Not so good
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BIBs System
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Spray Foam
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SIPS Panels
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Insulated Concrete Forms
ICF’s
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Floors
R-30 Climate Zone 1
R-30 Climate Zone 2
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64
Floor Insulation Installation
(502.1.4.7)
Installed in a permanent manner
Insulation in substantial contact with the
surface being insulated
Supports 24” o.c. max
Don’t block vents with insulation batts
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65502.1.4.7
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66
502.1.4.7
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67
Not so good
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68
24”
Top of footing
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69
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70
Radiant Slabs (502.1.4.9)
R-10 insulation
under the entire
slab
Radiant slab
insulation cannot
be traded off
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Below Grade Wall and Slab
71
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72
Don’t do this
Moisture
Do this
R-5
Foam
R-13 Batt
Never cover
insulation
with plastic
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73
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
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74
Glazing and Door U-Factors (502.1.5)
U-Factors determined by:
NFRC Test
Methods
or
Chapter 10
Defaults
3 complicated
exceptions have
been deleted
0.32
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75
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
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76
Moisture Control
Vapor retarders required in:
Walls
Faced batts, sheet goods, vapor retarder paint
Floors
Decking material typically meets requirement
Ceilings
Not required if ventilated space above insulation
is 12” or greater
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77
Exception for Ventilated Attics
Unvented, conditioned attics are allowed
under certain conditions
See website
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78
Unvented Attic Criteria
Unvented attic
contained completely
within the building
thermal envelope.
NO vapor retarders
installed at ceiling
level.
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79
Moisture Control (506.1.6.1)
502.1.6.1 Vapor Retarders: Vapor retarders
shall be installed on the warm side (in winter)
of insulation as specified in the following
cases.
EXCEPTION: Vapor retarder installed with
not more than 1/3 of the nominal R-value
between it and the conditioned space.
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502.1.6.6 Walls:
502.1.6.6 Walls: Walls separating
conditioned space from unconditioned space
shall have a vapor retarder installed. Faced
batt insulation shall be face stapled.
Exception: No vapor retarders required for
walls with exterior foam sheathing
R-5 Climate Zone 1
R-7.5 Climate Zone 2
80
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81
R-2
1
Outside Inside
No Vapor Retarder Required
R-5
Must be R-21 or less
in the cavity
Must be applied
exterior to all
frame and
structural
sheathing
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82
R-2
1
Outside – 300Inside – 700
Vapor
X
XX
Dew
Point
Condensing
Surface
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Vapor Transmission Rate
83See Builder’s Field Guide www.energy.wsu.edu/code
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Variable Resistance Materials
84
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85
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86
Air Leakage (502.4)
Typical air infiltration can
account for 25% to 40% of a
home’s heat loss
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87
Air Sealing
Penetrations in
top and bottom
plates – all
walls
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88
Air Sealing
Wiring penetrations in electrical boxes – exterior
walls only
Sole Plates – Inside the structure where the
bottom plate and sub-floor meet. Easy to install
and verify.
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89
Air Sealing
Rim Joists between
heated floors – Can
be applied either on
the interior or
exterior
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90
Air Sealing
Any other
penetrations
between inside
and outside the
house
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91
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92
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93
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94
Recessed Lighting
Leaky recessed lights may account for $5 to
$30 each worth of energy loss per year
Each unsealed light may serve as a conduit
for the movement of about 1/3 of a gallon of
water daily into a cold attic
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95
502.4.4 Recessed Lighting
Fixtures: Installed in
Insulated Assemblies
Must be tested for air leakage using
ASTM E283
A gasket or caulking must seal the
fixture to the drywall
Other options for fixture air sealing,
including field inspection and a sealed
box have been deleted.Residential and
Non-residential
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96
Building Air Leakage Testing
(502.4.5)
Air leakage testing
required for new
houses
Blower door is
required
Maximum leakage
allowed:
.00030 SLA (Specific
Leakage Area)
See website
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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
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What the numbers mean
Pressure (in Pascals)
Flow rate (CFM)
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99
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)
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100
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101
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
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102
HVAC System Sizing (503.2.2)
Heating/cooling systems
limited to 150% of design
heat load except:
Systems less than 40,000
Btu/h are exempt from
sizing requirements
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103
Ducts (503.10.1)
Installation of ducts in
exterior walls, floor or
ceilings cannot
displace required
insulation
Building cavities
cannot be used as
ducts
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104
Duct Testing (503.10.2)
Ducts located
outside the
conditioned space
must be tested
Maximum leakage
rates specified in
RS-33
See website
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Duct Testing Standards
Rough-In Testing Targets:
Total leakage ≤ 6% of the CFA at 25 PaOR
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 PaOR
Leakage to exterior ≤ 6% of the CFA at 25
Pa
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Duct Testing Standards
Exceptions:
Duct tightness test is not required if –
The air handler and all ducts are
located within conditioned space.
or
The furnace is a nondirect vent
type combustion appliance in
an unconditioned space with a
maximum of 6 feet of ductwork
in the unconditioned space.
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Resources for Standard and Testing
Duct Testing Affidavit Test Result Calculator
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108
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109
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110
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111
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112
Not so good
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113
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114
Ducts in Dropped Ceiling in Hall
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115
After Drywall
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116
Demand Water Heaters
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Service Water Heating
117
•R-3 Pipe insulation
required outside the
conditioned space
•R-10 pad required for
electric water heaters on
unconditioned floors
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Indoor Lighting (505.1)
50% of all indoor
luminaires
(fixtures) shall be
high efficacy
Interpretation from
SBCC allows for
screw in LEDs or
CFLs.
118
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119
Outdoor Lighting
GU 24 Base
•High efficacy luminaire
required for lighting
attached to the building
or
•Must have photo daylight
control and a motion
sensor
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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) 120Residential
1” max
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121
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
Table 6-1Prescriptive Requirements for Single Family Residential
Climate Zone 1
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122
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
Table 6-2Prescriptive Requirements for Single Family Residential
Climate Zone 2
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Energy Credits Chapter 9
Dwelling
units must
develop one
credit from
the following
options
123
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High Efficiency HVAC Equipment
Gas, propane or oil furnace.
Min. AFUE 92%Or
Air-source heat pump
Min. HSPF 8.5Or
Ground Source Heat Pump
Min. COP 3.3
124
1.0 credit
1.0 credit
2.0 credits
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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
125
1.0 credit
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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
126
1.0 credit
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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%
127
.5 credit
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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%1281.0 credit
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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
Ceiling R-49 ADV
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%
129
2.0 credits
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Air Leakage Control and Efficient
Ventilation
Air Leakage rate
reduced to .00020 SLA
(3.7 ACH50)
and
The Whole House
Ventilation System is
a heat recovery
ventilator
130
.5 credit
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Additional Air Leakage Control
and Efficient Ventilation
Air Leakage rate
reduced to .00015 SLA
(2.8 ACH50)
and
The Whole House
Ventilation System is a
heat recovery ventilator
1311.0 credit
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Efficient Water Heating
Gas, propane or oil water
heater
Min. EF .62
Electric water heater
Min. EF .93and
Low flow faucets
Shower and Kitchen sink =
1.75 GPM
All other lav. Faucets = 1.0
GPM 132
.5 credit
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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 2.0133
1.5 credit
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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
Dwelling units
exceeding 5000 ft2
134
1.0 credit
-1.0 credit
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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
135