REVIEWED RESUB 1-BLD2023-0665+Energy_Calculations+8.29.2023_10.23.48_AM+3752676REVIEWED
BY
CITY OF EDMONDS
2018 Washington State Energy Code — Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family — New & Additions (effective February 1, 2021)
Version 1.0'
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
Flores Addition J3 Architects- Neil Jorgensen
19804 81st PL W, Edmonds 98026 425-242-0369
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 KU Date 05/31/2023
i
All Climate Zones (Table R402.1.1
R-Value a
U-Factor a
Fenestration U-Factor b
n/a
0.30
Skylight U-Factor b
n/a
0.50
Glazed Fenestration SHGC b,e
n/a
n/a
Ceiling e
49
0.026
Wood Frame Wall g,h
21 int
0.056
Floor
30
0.029
Below Grade Wall `,h
10/15/21 int + TB
0.042
Slab d,f R-Value & Depth
10, 2 ft
n/a
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 insulation from Appendix
Table A101.4 shall not be less than the R-value specified in the table.
The fenestration U-factor column excludes skylights.
b
"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.
For single rafter- or joist -vaulted ceilings, the insulation 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 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.
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.
RESUB
Aug 29 2023
C OF EDMONDS
DEVELOPMENT
SERVICES
EP
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: o 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
Heating
Options
Fuel Normalization Descriptions
Credits - select ONE
heating option
User Notes
1
Combustion heating minimum NAECAb
0.0
0
2
Heat pump`
1.0
❑
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
Credits - select
energy option
category
❑
Energy
Options
p
Energy Credit Option Descriptions
ONE
from each
1.1
Efficient Building Envelope
0.5
❑
1.2
Efficient Building Envelope
1.0
❑
1.3
Efficient Building Envelope
0.5
❑
1.4
Efficient Building Envelope
1.0
❑
1.5
Efficient Building Envelope
2.0
❑
1.6
Efficient Building Envelope
3.0
❑
1.7
Efficient Building Envelope El
0.5
❑
2.1
Air Leakage Control and Efficient Ventilation
0.5
❑
2.2
Air Leakage Control and Efficient Ventilation
1.0
❑
2.3
Air Leakage Control and Efficient Ventilation
1.5
❑
2.4
Air Leakage Control and Efficient Ventilation Li
2.0
❑
3. la
High Efficiency HVAC
1.0
0
3.2
High Efficiency HVAC
1.0
❑
3.3a
High Efficiency HVAC
1.5
❑
3.4
High Efficiency HVAC
1.5
❑
3.5
High Efficiency HVAC
1.5
❑
3.6a
High Efficiency HVAC
2.0
❑
4.1
High Efficiency HVAC Distribution System
0.5
❑
4.2
High Efficiency HVAC Distribution System
1.0
❑
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) —
Summary of Table
Energy Credit Option Descriptions (cont.)
Efficient Water Heating
Efficient Water Heating
Efficient Water Heating
R406.2 (cont.)
Credits -select ONE
energy option from
each category d
0.5 ❑
0.5 ❑
1.0 0
Energy
Options
5.1d
5.2
5.3
5.4
Efficient Water Heating
1.5
❑
5.5
Efficient Water Heating
2.0
❑
5.6
Efficient Water Heating
2.5
❑
6.1e
Renewable Electric Energy (3 credits max)
1.0
0
7.1
Appliance Packaee
0.5
❑
User Notes
Total Credits 1 1 2.0 IlCalculate Totall I 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 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.
Please print only pages 1 through 3 of this worksheet for submission to your building official.
Prescriptive Path —Single Family 2018 Washington State Energy Code-R 3
simple Heating System Size: wasnington state
This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State Energy Code (WSEC) and ACCA Manuals
J and S. This tool will calculate heating loads only. ACCA procedures for sizing cooling systems should be used to determine cooling loads.
Please complete the green drop -downs and boxes that are applicable to your project. As you make selections in the drop -downs for each section, some
values will be calculated for you. If you do not see the selection you need in the drop -down options, please contact the WSU Energy Program at
energycode@energy.wsu.edu or (360) 956-2042 for assistance.
Project Information
Flores Addition
19804 81st PL W
Edmonds 98026
Heating System Type: O All Other Systems
Contact Information
Neil Jorgensen
J3 Architects LLC
425 242 0369
QQ Heat Pump
To see detailed instructions for each section, place your cursor on the word "Instructions"
Design Temperature
Instructions Design Temperature Difference (AT)
Edmonds ] AT = Indoor (70 degrees) - Outdoor Design Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq ft)
Average Ceiling Height
Instructions Average Ceiling Height (ft)
Glazing and Doors
Instructions
Select U-Factor
Skylights
Instructions
Insulation
Attic
Instructions l
Select R-Value J
Single Rafter or Joist Vaulted Ceilings
Instructions
R-38 Vented
Above Grade Walls (See Figure 1)
Instructions
LR-21Intermediate
Floors
Instructions
R-30
�
J
Below Grade Walls (see Figure 1)
Instructions
Select R-value
J
Slab Below Grade (see Figure 1)
Instructions
Select conditioning
�
Slab on Grade (see Figure 1)
Instructions
Select R-Value
� ,
Location of Ducts
Instructions
Unconditioned Space;=::�'w
Figure 1.
Above Grade
Below Grade
107
Conditioned Volume
7.8
829
U-Factor
X Area =
No selection
U-Factor
X Area =
0.50
U-Factor X Area =
No selection
U-Factor X Area
0.027 1 107
U-Factor X Area
0.056 1 22
U-Factor X Area
0.029 1 107
U-Factor X Area
No selection
F-Factor X Length
No selection
F-Factor X Length
No selection
Sum of UA
Duct Leakage Coefficient
1.10
Envelope Heat Load
Sum of UA x AT
Air Leakage Heat Load
Volume x 0.6 x AT x 0.018
UA
UA
UA
M.
UA
2.89
UA
1.20
UA
3.10
1U,
UA
UA
7.20
331 Btu / Hour
412 Btu / Hour
Building Design Heat Load 743 Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 817 Btu / Hour
Ducts in unconditioned space: sum of buildingq heat loss x 1.10
Ducts in conditioned space: sum of building heat loss x 1
Maximum Heat Equipment Output 1,022 Btu / Hour
Buildinq and duct heat loss x 1.40 for forced air furnace
Buildinq and duct heat loss x 1.25 for heat pump
(07101113)