Energy Code Worksheet2018 Washington State Energy Code — Residential
Energy Code Compliance for All Climate Zones in Wash
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
2978
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,
Representative
Date
„ _ All Climate Zones (Table R402.1.1_)
_
R -Value '
U -Factor'
Fenestration LI -Factor
_
n/a
0.30
Skylight U -Factor b
n/a
0.50
Glazed Fenestration SHGC bje
n/a
n/a
Ceiling`
49i
0.026
Wood Frame Wall &I
21 int
0.056
Floor ..
._ 30
0.029
Below Grade Wallch
_ _
10/15/21 int + TB
_ _
0.042
Slab d•'R-Value & Depth
10, 2 ft
n/a
R -values are minimums. U -factors and SHGC are maximums. When insulation is installed Ina 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 +5T8" means R-10continuous 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 +STB" 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 incompliance with Standard ICC 400, log walls shall meet the requirements for
8
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 Palh —Single Family 2018 Washington State Energy Code -R
2018 Washington State Energy Code - Residential
Enerav Code Compliance for All Climate Zones in
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.
Opti -
Summary of Table R406.2
Heating
Options
Fuel Normalisation Descriptions
Credits - select ONE
heating option
User Notes
1
Combustion heating minimum NAECAI
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
❑
Energy
Options
p
Energy Credit Option Descriptions
Credits -select ONE
energy option from each
categoryd
1.1
Efficient Building Envelope
0.5
❑
1.2
Efficient Building Envelope
1.0
❑
1.3
Efficient Building Envelope
0.5
0
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
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
2.0
❑
3.1'
High Efficiency HVAC
1.0
❑
3.2
High Efficiency HVAC
1.0
0
3.3'
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 I
1.0
❑
Prescriptive Palh -Single Family 2018 Washington State Energy Code -R
2018 Washington State Energy Code — Residential
Energy Code Compliance for All Climate Zones in
Energy
Options
5,1d
Summary of Table 8406.2 (cont,)
tONE�
Energy Credit Option Descriptions (cont.) from User Notes
eachry
Efficient Water Heating ❑
5.2
Efficient Water Heating
T2,
5.3 _
_❑_
Efficient Water Heating _
❑
SA _
Efficient Water Heating _
❑
5.5
Efficient Water Heating
❑
5.6
Efficient Water Heating
❑
6.1`
Renewable Electric Energy (3 credits max)
1.0
7A
Appliance Package
0.5
❑
Total Credits
L.6.JO I
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 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,
Prescriptive Path —Single Family 2018 Washington State Energy Code -R
Size:
aung system sizing
calculator is based on the Prescriptive Requirements of the 2018 Washington
Stale Energy Code (WSEC)
and ACCA
s J and S. This tool
will calculate heating
loads only, ACCA procedures for sizing cooling systems
should be used to determine
cooling loads.
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
will be calculated for you. I(you do not see the selection you need in the drop-down options, please contact the WSU Energy Program al
:ode@energy.wsu.edu or (360) 956-2042 for assistance.
cru our mwnnavuo
Contact Information
2978 !
Pleating System Type: OaiowersYnrn,s
Oueatwmp
To see detailed instructions for each section, place your cursor on the
word "Instructions"
Design Temperature
msuucuons �er -- -- -----T�a�
Design Temperature Difference
(AT) 53
[�
.1T=IrMoor(JO degrees) -Outdoor Design Temp
Area of Building
Conditioned Floor Area
mstrncuons Conditioned Floor Area (sq fl)
2,969
Average Culling Height
Conditioned Volume
msm aeons Average Cellln9 Heigh! (ft)
8:5 25,237
Glaring and Doors
U -Factor X Area -
UA
Inslrucllons
,� u-oza
0.280 346
96.88
5kylighfs
U•Factor X Area
UA
Insaocuons
0.50
---
Insulation
Attic _
U -Factor X Area =
UA
Instrucuons � Rio `- `- "- �
0.026 1,679 143.65
Single Rafter or Joist Vaulted Callings
U•Factor X Area
UA
Insuucuons selxt awame
�
No selecdon �
___
Above Grade Walls /:ea Fryo.o r)
U -Factor X Area
UA
Insuucuons R-zt mterm dace �
I�1
0.056 2,640 ;.
147.84
Floors
_
U -Factor X Area
UA
Insuucuons (;ter -Ras
�.
0.025 1,690 ":
42.25
Below Grade Walls r ee Figure r)
U -Factor X Area
UA
Inslrucllons Se1M R -value
��,:�
w
No selection � 1'
___
Slab Below Grader Fraora t)
F -Factor X Length
UA
Incur coons se act mauoniog
��
No selection �
-
Slab on Grader Fig er)__ __
F -Factor X Length
UA
msuuen°ns soen R-vawe �
No aelecllon �
—
Location of Ducts
msrmcumrs r- -
-
Duct Leakage Coefficient
����
1.00
Sum of UA
330.62
Envelope Haat Load 17,523 Btu/Hour
Fi1ur> e 1. Sum o7 UA x eT
Alr Leakage Heat Load 14,445 Blu /Hour
Volumex 0.5x 1Tx 0.018
"^°°esr.ae BuIlding Design Heat load 31,968 Btu/Hour
��..z Air leakage +envelope heat loss
,f �,d,...a ,,,....��.�-.
....... BuIlding and Duct Heat Load 31,968 Btu / Hovr
Ducts in unconditioned space: sum o7bui/dino heat loss x 1.10
Ducts In conditioned space: sum ol6ulldinp heat lossx 1
Maximum Heat Equipment Output 39,961 Blu /Hour
Buildino and duct heat loss x 1.40lor /orced a!r /ornate
Buildino and duct heat loss x 1.25 /orheat puma
(Ol/Of/f3J
Window, Skylight and Door Schedule
Ref. U -factor
Exempt Swinging Door (24 sq. ft. max.)
Exempt Glazed Fenestration (15 sq, ft. max.)
Vertical Fenestration (Windows and doors)
Component
Width Height
Qt. Feet Inch Feet Inch
1 . 3, 6 a
Width Height
Area UA
20.0 4.00
0.0 0.00
Area UA
5.0
1.40
30.0
8.40
30.0
8.40
18.0
5.04
48.0
13.44
40.0
11.20
12.0
3.36
48.0
13.44
20.0
5.60
16.0
4.48
24.0
6.72
24.0
6.72
22.5
6.30
8.0
2.24
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
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 Vertical Fenestration Area and UA
Vertical Fenestration Area Weighted U = UA/Area
Overhead Glazing (Skylights)
Component
Width Height
Qt. Feet Inch Feet Inch
Sum o/Overhead Glazing Area and UA
Overhead Glazing Area Weighted U = UA/Area
Total $Utn of FeneStYation AYea and UA (for heating system sizing calculations)
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0,01
0.00
345.51 96.74
0.28
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
0.0 0.00
0.00
365.5 100.74