REVIEWED BLD-RESUB 1-Energy+4.28.2022REVIEWED
13Y RESUB
2018 Washington State Energy Corte - Residential
CITY OF EDMONDS Apr 292022
BUILDING DEPARTMENT Prescriptive Energy Code Compliance for All Climate Zones in Washington of s
......"......"........ .............. Single Family - New & Additions effective FebruM 1, 2021 version 1.1 -1-T-T
These requirements apply to all IRC building types, including detached one- and two-family
dwellings and multiple single-family dwellings (townhouses).
Project Information Contact information
Smith Residence Remodel Marci Kastner Architect
21412 98th Avenue West, Edmonds WA 98020 206 783-7330 marci@marcikastner.com
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 anti 406.3 - Energy Credits.
Authorized Representative Dote 04/28/2022
All Climate zones (Table R402.1.1)
R-Value a
U-factor a
Fenestration U-Factor b
n�a
0.30
Skylight U-Factor h
n1a
0.50
Glazed Fenestration SHGC
nja
n/a
Ceiling B
49
0.026
Wood Frame Wall $•'
21 int
0.056
Floor 30 0.029
Below Grade Wall `" 10/15/21 int + TB 0.042
Slab d•f R-Value & Depth 10, 2 ft n,ta
R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity that is less
a than the label or design thickness of the insulation, the compressed R-value of the insuiation 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.
"10/15/21 +5TB'I 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 +5T6'I 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'I
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.
For single rafter- orjoist-vaulted ceilings, the insuiation may be reduced to R-38 if the full insulation depth
e extends over the top plate of the exterior wall.
R-7.5 continuous insulation installed aver an existing slab is deemed to be equivalent to the required perimeter
f slab insuiation 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, lag walls shall meet the requirements for
g climate zone 5 of ICC 400.
Int. (intermediate framing) denotes framing and insulation as described in Section A103.2.2 including standard
h framing 16 inches on center, 78% of the wall cavity insulated and headers insulated with a minimum of R-10
insulation.
Prescriptive Path — Single Family 2018 Washington State Energy Code-R
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
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
Heating Fuel Normalization Descriptions
Options
1 . Combustion heating minimum NAECAb
2 Heat pump`
3 Electric resistance heat only -furnace or zonal
4 DHP with zonal electric resistance per option 3.4
5 All other heating systems
Energy Energy Credit Option Descriptions
Options
1.1 Efficient Building Envelope
1.2 Efficient Building Envelope
1.3 Efficient Building Envelope
1.4 Efficient Building Envelope
1.5 Efficient Building Envelope
1.6 Efficient Building Envelope
1.7 Efficient Building Envelope
2.1 Air Leakage Control and Efficient Ventilation
_2.2 Air Leakage Control and Efficient Ventilation
2.3 Air Leakage Control and Efficient Ventilation
2.4 Air Leakage Control and Efficient Ventilation
3.1a High Efficiency HVAC
3.2 High Efficiency HVAC
3.3- High Efficiency HVAC
3.4 High Efficiency HVAC
3.5 High Efficiency HVAC
3.6- High Efficiency HVAC
4.1 High Efficiency HVAC Distribution System
4.2 High Efficiency HVAC Distribution System
Credits -select ONE User Notes
heating option
0.0 lExisting forced air gas
1.0 ❑ O
-1.0
_ _0.5_ _ ❑
-1.0 ❑
Credits - select ONE
energy option from each
category ° _
0.5 ❑
1.0 _ _ ❑
0.5 2 New windows U= 0.28 max.
2.0
3.0
0.5
1.0
❑
1.5
El
_
� 2.0
❑
1.0
❑
1.0
❑
1.5
❑
1.5
❑
Prescriptive Path -Single Family 2018 Washington State Energy Code-R
2018 Washington State Energy Code — Residential
Prescriptive Energy Code Compliance for Ali Climate Zones in Washington
Single Family —New & Additions (effective February 1, 2021)
Summary of Table R4D6.2 (cont.)
Energy
Credits - select ONE
Energy Credit Option Descriptions (cont.)
energy option from User Notes
Options
each category'
5.1d
Efficient Water Heating
0.5 ❑
5.2
Efficient Water Heating
_ _
0.5 0[New tankless unit
5.3
Efficient Water Heating
1.0 ❑
5.4
Efficient Water Heating
_
1.5 ❑
5.5
Efficient Water Heating
❑
5.6
Efficient Water Heating ❑
_2.0
2.5 ❑
6.1`
Renewable Electric Energy (3 credits max)
1.0 0
7.1
Appliance Package
0.5 ID
Total Credits
1.6 clear Form
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 S. 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 io the upper right of the second column to deselect radiobuttons in that group.
Please print only pages 1 through 3 of ;i,is worksheet for submission to your building official.
Officials
Prescriptive Path —Single Family 2018 Washington State Energy Code-R