REVIEWED BLD2023-1244+Energy_Calculations+10.5.2023_12.56.22_PM+38240592018 Washington State Energy Code — Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family — New & Additions (effective February 1, 2021)
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
Plan 3180 MIKE JOHNSON- mike@nash-architects.com
09-27-23
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.
Digil—¢ii by Mike J°M1nson
. Authorized Representative Mike Johnson .mail=miker@naenamnile ll.S " """� °" Date 09/27/2023
Dale: 2023-0513:49:01 -0 09
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
n/a
n/a
Glazed Fenestration SHGC b,,
49 i
0.026
Ceiling e
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.
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.
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.
Prescriptive Path — Single Family 2018 Washington State Energy Code-R
2018 Washington State Energy Code - Residential
Prescri tive Energy Code Compliance for All Climate Zones in Washington
e 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
Heating Credits - select ONE
O tions Fuel Normalization Descriptions heating option User Notes
P
1
Combustion heating minimum NAECAb
0.0
0
2
Heat pump`
1.0
0
3
Electric resistance heat only - furnace or zonal
-1.0
0
4
DHP with zonal electric resistance per option 3.4
0.5 0
-1.0 0
Credits - select ONE
energy option from each
category
5
All other heating systems
Energy Credit Option Descriptions
Energy
Options
p
1.1
ZMEMMuN®o MooeMe
0.5
0
1.2
Efficient Building Envelope
1.0
0
1.3
Efficient Building Envelope
0.5
1.4
Efficient Building Envelope
1.0
0
1.5
Efficient Building Envelope
2.0
0
1.6
Efficient Building Envelope
3.0
0
1.7
Efficient Building Envelope
0.5
0
2.1
Air Leakage Control and Efficient Ventilation
0.5
0
2.2
Air Leakage Control and Efficient Ventilation
1.0
0
2.3
Air Leakage Control and Efficient Ventilation
1.5
0
2.4
Air Leakage Control and Efficient Ventilation
2.0
0
3. la
High Efficiency HVAC
1.0
0
3.2
High Efficiency HVAC
1.0
0
3.3a
High Efficiency HVAC
1.5
0
3.4
High Efficiency HVAC
1.5
0
3.5
High Efficiency HVAC
1.5
3.6a
High Efficiency HVAC
2.0
0
4.1
High Efficiency HVAC Distribution System
0•5
0
4.2
High Efficiency HVAC Distribution System
1.0
Q
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
MW Single Famil�— New & Additions (effective February 1, 2021)
MMMMW__ Summary of Table R406.2 (cont.)
Energy
Credits -select ONE
Options
Energy Credit Option Descriptions (cont.)
energy option from
d
User Notes
Efficient Water Heating
Efficient Water Heating
Efficient Water Heating
Efficient Water Heating
each category
0.5 ❑
0.5 0
1.0 0
1.5 0
5.1d
5.2
5.3
5.4
5.5
Efficient Water Heating
2.0
5.6
Efficient Water Heating
2.5
0
6.1e Renewable Electric Energy (3 credits max)
1.0 0
7.1 Appliance Package
0.5 ❑
Total Credits
6•0 1 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.
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
Window, Skylight and Door Schedule
Project Information Contact Information
Plan 3180
Width Height
Ref. U-factor Qt. Feet nch Feet 1-h Area UA
Exempt Swinging Door (24 sq. ft. max.) ® 0.0 0.00
Exempt Glazed Fenestration (15 sq. ft. max.) 0.0 0.00
Vertical Fenestration (Windows and doors)
Component
to House Door
rcer. u-racior
Width Height
Qt. Feet I"`h Feet In&
Sum of Vertical Fenestration Area and UA
Vertical Fenestration Area Weighted U = UA/Area
Area UA
540.81 151.42
0.28
Overhead Glazing (Skylights)
Component Width Height
Description Ref. U-factor Qt. Feet Inch Feet Inch Area UA
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
0.0 0.00
Sum of Overhead Glazing Area and UA 1 0.01 0.00
Overhead Glazing Area Weighted U = UA/Area 0.00
Total Sum of Fenestration Area and UA (for heating system sizing calculations) 540.8 151.42
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 Contact Information
Plan 3180 Mike Johnson
mi ke(cbnash-architects.com
Heating System Type: O All other systems O Heat Pump
To see detailed instructions for each section, place your cursor on the word 'Instructions"
Design Temperature
Instructions I IDesign Temperature Difference (AT)
Edmonds • OT = Indoor (70 degrees) - Outdoor Design Temp
Arr^ of Building
Conditioned Floor Area
instrucuons Conditioned Floor Area (sq ft)
F 3,180
Average Ceiling Height
Conditioned Volume
Instructions Average Ceiling Height (ft)
9.0
28,620
Glazing and Doors
U-Factor
X Area =
UA
Instructions
`u-0.30
. I
J
0.300
541
162.30
Skylights
10
X =
UA
Instructions
0.50
Insulation
Attic
U-Factor
X Area =
UA
Instructions
R-49
�
0.026
1,940
50.44
Single Rafter or Joist Vaulted Ceilings
U-Factor
X Area
UA
Instructions R 38vented
0.027
Above Grade Walls (see Figure 1)
U-Factor
X Area
UA
Instructions
R-21 Intermediate�
0.056
3,100
173.60
Floors
U-Factor
X Area
UA
Instructions
0.025
1,940
48.50
R-38
•
Below Grade Walls (see Figure 1)
U-Factor
X Area
UA
Instructions
R-21 Interior
�
0.042
F
Slab Below Grade (see Figure 1)
F-Factor
X Length
UA
Instructions R-10 Fultyinsulated
�
0.303
F
Slab on Grade (see Figure 1)
F-Factor
X
UA
Instructions
R-10 Fully Insulated
�
0.360
Location of Ducts
Instructions
Duct Leakage Coefficient
W Conditioned Space
•
1.00
Sum
of UA
434.84
Figure 1.
Above Grade
46
Envelope Heat Load 20,003 Btu / Hour
Sum of UA x AT
Air Leakage Heat Load 14,218 Btu/Hour
Volume x 0.6 x AT x 0.018
Building Design Heat Load 34,221 Btu / Hour
Air leakage + envelope heat loss
Building and Duct Heat Load 34,221 Btu / Hour
Ducts in unconditioned space: sum of building heat loss x 1.10
Ducts in conditioned space: sum of building heat loss x 1
Maximum Heat Equipment Output 42,776 Btu / Hour
Building and duct heat loss x 1.40 for forced air furnace
Building and duct heat loss x 1.25 for heat pump
(07/01/13)