REVIEWED-RESUB 2-BLD2021-1409+Energy_Calculations+6.6.2023_11.56.02_AM+35908752018 Washington State Energy Cade - Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
$irO. a Fad -,New t AddMons {?ems Fabnzvy 11. T -
aylor ADU 18703 79th Place W, Edmonds WA 98026
These requirements apply to all IRC building types, including detached one- and two-family
dwellings and multiple single-family dwellings (townhouses).
Pro act In ormation
a for ADU
Contact Information
intent Sessa, Sessa EmIneerill Services
1.1
Instructions: This single-family project will use the requirements of the Prescriptive Path below and
incorporate the minimum values listed. Based on the size of the structure, the appropriate number of
additional credits are checked as chosen by the permit applicant.
Provide all information from the following tables as building permit drawings: Table R402.1- Insulation and
Fenestration Requirements by Component, Table R406.2 - Fuel Normalization Credits and 406.3 - Energy Credits.
Authorized Representative
Date T 1120l2023
All Climate Zon Table R4 2.1.1
R-Value °
U-Factors
Fenestration U-Factor b
_
n/a
0.30
Sk light li-Factor b
n/a
0.50
Glazed Fenestration SHGC b,e
n/a
n/a
Ceiling'
49
0.026
Wood Frame Wail
21 int
0.056
Floor
- 30
0.029
_
Below Grade_W-all `'
10/15/21 int + TB
0.042 -
Slab dJ R-Value & Depth
10, 2 ft -
n/a
R-values are minimums. U-factors
and SHGC are maximums. When insulation
is installPrl in a ravity that is IArc
a than the label or design thickness of the insulation, the compressed R-value of the insulation from Appendix
Table A101.4 shall not be less than the R-valuespecified in the table.
b The fenestration U-factor column excludes skylights.
"10/15/21 +5TB" means R-10 continuous insulation on the exterior of the wall, or R-15 continuous insulation on
the interior of the wall, or R-21 cavity insulation plus a thermal break between the slab and the basement wall at
c the interior of the basement wall. "10/15/21 +5TB" 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 wall. "5TB"
means R-5 thermal break between floor slab and basement wall.
d R-10 continuous insulation is required under heated slab on grade floors. See Section R402.2.9.1. _
e For single rafter- or joist -vaulted ceilings, the insulation may be reduced to R-38 if the full insulation depth
extends over the top plate of the exterior wall.
R-7.5 continuous insulation installed over an existing slab is deemed to be equivalent to the required perimeter
f slab insulation when applied to existing slabs complying with Section R503.1.1. If foam plastic is used, it shall
meet the requirements for thermal barriers protecting foam plastics.
For log structures developed in compliance with Standard ICC 400, log walls shall meet the requirements for
g climate zone 5 of ICC 400.
lint. (intermediate framing) denotes framing and insulation as described in Section A103.2.2 including standard
h framing 16 inches on center, 78% of the wail cavity insulated and headers insulated with a minimum of R-10
insulation.
2018 Washington State Energy Code - Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family - New & Additions (effective February 1, 2021)
Each dwelling unit in a residential building shall comply with sufficient options from Table R406.2 (fuel
normalization credits) and Table 406.3 (energy credits) to achieve the following minimum number of
credits. To claim this credit, the building permit drawings shall specify the option selected and the
maximum tested building air leakage, and show the qualifying ventilation system and its control sequence
of operation.
1. Small Dwelling Unit: 3 credits
Dwelling units less than 1,500 sf in conditioned floor area with less than 300 sf of fenestration area.
Additions to existing building that are greater than 500 sf of heated floor area but less than 1,500 sf.
2. Medium Dwelling Unit: 6 credits
All dwelling units that are not included in #1 or #3
3. Large Dwelling Unit: 7 credits
Dwelling units exceeding 5,000 sf of conditioned floor area
4. Additions less than 500 square feet: 1.5 credits
All other additions shall meet 1-3 above
Before selecting your credits on this Summary table, review the details in Table 406.3 (Single Family), on page 4.
------- -- ------ --------Summary of Table R406.2 and 406.3 ----------------`-_---s
Heating Credits - select ONE r A
OOptions Fuel Normalization Descriptions User Notes
ptio - ----------- - - heating option i
1 Combustion heating minimum NAECAb 0.0 ❑
2 Heat pump` 1.0 - -- ❑ R- -
3 Electric resistance heat only - furnace or zonal -1.0 ❑
4 DHP with zonal electric resistance per option 3.4 0.5 ❑
5 All other heating systems -1.0 ❑
Energy
Options
1.1
Energy Credit Option Descriptions
Efficient Building Envelope
Credits - select ONE
I energy option from each
tale o d
0.5 ❑
,
1.2
Efficient Building Envelope
1.0
Q
1.3
Efficient Building Envelope
0.5
❑
1.4
Efficient Building Envelope
1.0
❑
1.5
Efficient Building Envelope
2.0
❑
1.6
1.7
Efficient Building Envelope
3.0
❑
Efficient Building Envelope d
0.5
I_ 2.1
Air Leakage Control and Efficient_ Ventilation
0.5
❑
1 2.2
Air Leakage Control and Efficient Ventilation
1.0
❑
2.3
2.4
Air Leakage Control and Efficient Ventilation
Air Leakage Control and Efficient Ventilation
1.5
2.0
❑
❑
3. 1'
3.2
High Efficiency HVAC
High Efficiency HVAC
1.0
❑
❑
1.0
3.3'
High Efficiency HVAC
1.5
❑
- 3.4 _
_ 3.5
3.6'
High Efficiency HVAC _ -_ 15
High Efficiency HVAC„ 1.5
High Efficiency-HVAC _ _ 2.0
High Efficiency HVAC Distribution System
0
❑
❑
44.1
.2 )High Efficiency HVAC Distribution System II 1.0
❑
Prescriptive Path - Single Family
Prescriptive Path - Single Family 2018 Washington State Energy Code-R r
2018 Washington State Energy Code-R
2
2018 Washington State Energy Code - Residential
Prescriptive Energy Code Compliance for All Climate_ Zones in Washington
Single Family -- New &.Additions (effective February 1, 2021)
- - Summary of Table R406.2 (cont.)
Energy
Options
Energy Credit Option Descriptions (coat.)
Credits - select ONE
energy option from
each category d
User Notes I
5.1d
- _ _
Efficient Water Heating
0.5
❑
5.2
Efficient Water Heating
0.5
❑
5.3
Efficient Water Heating
1.0
E]
5.4
Efficient Water Heating
1.5
❑
5.5
Efficient Water Heating
2.0
❑
5.6
Efficient Water Heating
2.5
❑
6.le
Renewable Electric Energy (3 credits max)
1.0
Q
7.1 Ap fiance Package -- - _ _
7otai Credits
35
near roan
-0.5 _
a. An alternative heating source sized at a maximum of 0.5 W/sf (equivalent) of heated floor area or 500 W,
whichever is bigger, may be installed in the dwelling unit.
b. Equipment listed in Table C403.3.2(4) or C403.3.2(5)
c. Equipment listed in Table C403.3.2(1) or C403.3.2(2)
d. You cannot select more than one option from any category EXCEPT in category 5. Option 5.1 may be combined
with options 5.2 through 5.6. See Table 406.3.
e. 1.0 credit for each 1,200 kWh of electrical generation provided annually, up to 3 credits max.
See the complete Table R406.2 for all requirements and option descriptions.
f. Use the single radiobutton in the upper right of the second column to deselect radiobuttons in that group.
i Please print oniy gages 1 through 3 of this worksheet for submission to your building official.
For Building Officials Only
Prescriptive Path - Single Family
2018 Washington State Energy Code-R
...............................................
REVIEWED
BY
CITY OF EDMONDS
BUILDING DEPARTMENT
BLD2021-1409
3
RESUB
Jun 06 2023
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
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PROJECT:
ADU / REMODEL
SHEET:
E1.1