Energy Code Worksheet2018 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—Cont_ac_t Information
1361
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
_ All Glmate Zones (Table R402.1.1)
R-Value
_ __
U-Factor'___
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 `
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•'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 specifiedin the table.
b
The fenestration U -factor column excludes skylights.
-- --
"10/15/21 +STB" 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- orjoist-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
9
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 Washinglon State Energy Code -R
2018 Washington State Energy Code - Residential
Energv 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), bn page 4.
Summary of Table R406.2
Heating
Options
Fuel Normalization Descriptions
Credits - select ONE
heating option
User Notes
1 ...._.Heat
Combustion heating minimum NAECAb
._
0.0
Q
2
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
_
Energy Credit Option Descriptions
Credits -select ONE
energy option from each
category
1.1
Efficient Building Envelope
O.5
l ^ u
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 _
_ _
0.5
❑
2.1
Air Leakage Control and Efficient Ventilation
0.5
2.2
Air Leakage Control and Efficient Ventilation
1.0
❑
23
_
Air Leakage Control and Efficient Ventilation
1.5
_
❑
2.4
Air Leakage Control and Efficient Ventilation
2.0
❑
3.1a
High Efficiency HVAC
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 R406.2 (cont.)
Energy
Options
5.1d
Energy Credit Option Descriptions (cont.)
Efficient Water Heating
Credits - select ONE
energy option from
each category °_
0.5 ❑
User Notes
5.2
Efficient Water Heating
0.5
❑
5.3
Efficient Water Heating
1.0
0
5.4
Efficient Water Heating
1.5
2.0
❑
❑
5.5
Efficient Water Heating
5.6
Efficient Water Heating
2.5
❑
6.1e
Renewable Electric Energy (3 credits max)
1.0
7.1
Appliance Package
0.5
❑
Total Credits
E10
'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 onlypages<1,through 3:of#his u,!orksheet for submission to yourbuild)ng officiEil.
Prescriptive Path —Single Family 2018 Washington State Energy Code -R
Size: Wash
ling system sizing calculator Is based on the Prescdpfive Requirements o(the 2018 Washington
Stale Energy Code (WSEC)
and ACCA
J and S. This tool will calculate heating
loads only. ACCA procedures for sizing cooling systems
should be used to delermine
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 (or you. If you do not see the selecllon you need in the drop-down options, please contact the WSU Energy Program at
code@energy.tvsu.edu or (360) 956-2042 for asslslance.
Heating System Type: Oul ower synams
OO neatwmp
To see detailed instructions /or each section, place yourcursor on the word "Instructions"
Design Temperature
Insuucrons
-� -�
Design Temperature Difference
(\T)
50
spacawav
v i = IMoo r (/0 deg rces) - Ou fdoor Desgn Temp
Area of Building
Condltloned Ffoor Area
Instrocuons Conditioned Floor Area (sq fQ
; -;1,36'1
Average Celling Height
Conditioned Volume
Instruamns Average Ceiling Height (N)
'. ;. ',$;p 10,888
Glazing and Doors
U -Factor X Area -
UA
Instructions -„ �- -—
^�
u -o za�
0.280
'= :-768 �
47.04
Skylights
U -Factor X Area =
UA
mstrocuons
0.50
"'
---
Insulation
Attic - —
�:
U -Factor X Area =
UA
mstrucuons R"49 ""'"" '�""
0.026 ��9411�;;;
24.44
Single Rather or Joist Vaplted Cellings, _
U -Factor X Area
UA
Instrocuons
sal�ect a -varve �
No selecllon
0
---
Above Grade Walls
U -Factor X Area
UA
(,ea Figura rJ
Instructions
a-zr tnte�ned,ate
� � 0.056 "1,904=- %
196,62
Floors
U•Factor X Area
UA
mstruouoos � ___,_, _ _ ...
aae
_.
.
0.025 �� �967�"'-
24.03
Below Grade Walls (:ea viyvre r/
U -Factor X Area
UA
mstmcuons refect a-vawe
� No selecllon
0
Slab Below Orade ( rag ,o r) _
_ F -Factor X Le�
UA
mstrocnons
, �se�ece candtimmy
No selecllon
---
Slab on Grade (
Fig a 1/_
F -Factor X Len th
UA
mstrocnons
--�.- -, - .z -_ .
select R-va,ve
,_
No selecllon
---
Location of Ducts
Insuucuons -. �
• Duct Leakage CoeHlclent
cord.uam spare
1.00
Sum of UA
202.13
Envelope Heat Load
10,106
Btu/Hour
Flyure 1-
Sum of UAx eT
Air Leakage Heat Load
5,880
Btu /Hour
Valumex 0.6x �Tx 0.018
Ano.ec,:ee
BUllding Design Heat load
15,986
Btu /Hour
Air leakage + envePope heat loss
�,,,,„-.�v^•
Bullding and Duct Heal Load
15,986
Btu/Hour
Ducts Jn unconditioned space: sum o! building heat loss x
1.10
Ducts in condirloned space: sum o/building
heat loss x 1
Maximum Heat Equipment Output
19,982
Btu/Hour
Buildino and duct heat loss x 1.40lor /orced a!r/umace
euilding and duct heat /ors X 1.25 /or heat pump
(Ol/gf/l3J
Window, Skylight and Door Schedule
Project Information
Ref. U -factor
Exempt Swinging Door (24 sq. ft. max.)
Exempt Glazed Fenestration (15 sq. ft. max.)
Vertical Fenestration (Windows and doors)
Contact INorration
5.60
4.,.I',
16.0
..,6,
1.3.61
20.0
5.60
9.8
2.74
.,.-�.......
.... ......
:.�:
„-.,..."
rriasferd"ro4
8.96
Q 28
12.0
...
3.36
......'llI,IVIV
P
0.0
0.00
Pro V%
�aen -.
VI
'
IV VVI I
dtftlh
0.0
r
9 2�Ole
0.00
I
1
0.00
bedro9ffit,?
0.0
0$
N
�
0.0
ell
lst4ta
0.00
%e
t'arJ
WE
%2$.Vle
14M
ne�e
�gIV MZVV
0
Sise%arq e M
777
Z0,
0.0
77
0.0
0.00
0.0
,
Yid:..
.-
3
.x
0.0
0.00
0.0
I- IeVV
0.00
_
0.0
s`
.
0.0
Ref. U -factor
Exempt Swinging Door (24 sq. ft. max.)
Exempt Glazed Fenestration (15 sq. ft. max.)
Vertical Fenestration (Windows and doors)
Contact INorration
Width Height
Qt. Feet Inch Feet Inch
Component Width Height
Description Ref, U -factor Qt. Feet Inch
Inch
Feet
5.60
4.,.I',
16.0
..,6,
20.0
5.60
9.8
2.74
20.0
W
32.0
rriasferd"ro4
8.96
Q 28
12.0
3.36
3.56
P
0.0
0.00
Pro V%
�aen -.
VI
'
IV VVI I
dtftlh
0.0
r
9 2�Ole
0.00
I
1
0.00
bedro9ffit,?
0.0
0$
N
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0.0
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lst4ta
0.00
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t'arJ
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14M
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Sise%arq e M
777
Z0,
0.0
77
0.0
0.00
0.0
,
Yid:..
.-
3
.x
0.0
0.00
0.0
I- IeVV
0.00
_
0.0
s`
.
0.0
0.00
6w
a
0.00
IV -I ell
Width Height
Qt. Feet Inch Feet Inch
Component Width Height
Description Ref, U -factor Qt. Feet Inch
Inch
Feet
2,..,2
5.60
4.,.I',
16.0
..,6,
20.0
5.60
9.8
2.74
20.0
W
32.0
rriasferd"ro4
8.96
Q 28
12.0
3.36
3.56
P
0.0
0.00
Pro V%
�aen -.
re
.
IV VVI I
dtftlh
0.0
r
9 2�Ole
0.00
0.0
'
0.00
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0.0
0$
N
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0.0
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lst4ta
0.00
%e
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%2$.Vle
14M
ne�e
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0
Sise%arq e M
777
Z0,
0.0
77
0.0
0.00
0.0
,
Yid:..
.-
3
.x
0.0
0.00
0.0
I- IeVV
0.00
_
0.0
0.00
0.0
0.00
6w
a
0.00
IV -I ell
0.00
,
le
0.0
0.00
t r
0.00
0.0
0.00
0.0
ell I
VVl
0.00
0.01
0.00
3�_
0.01
III ;;s
IV 1
.Y:.�',.;'a
N
rr
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ll
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�-Yell
'a'..
v,x-.s.`zu.✓"_"✓e,..
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�.
,._.4Y
2,..,2
5.60
4.,.I',
16.0
..,6,
20.0
5.60
9.8
2.74
20.0
W
32.0
el
8.96
12.0
3.36
3.56
0.0
0.00
,.
0.0
.
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
WE
Ogg
14M
ne�e
0.00
0.0
777
0.0
77
0.0
0.00
0.0
0.00
0.0
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2.4:1....:..,,,.
0.0
0.00
0.0
0.00
_
0.0
0.00
0.0
0.00
6w
a
0.00
0.0
0.00
,
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.01
0.00
0.01
0.00
rr
r
r
Yx
�Ys'
r
�-Yell
MF
IV
AMA
MENEM
NO
l
44
r
�
�
ow
Vell
MM
Y°r
Area UA
20.0 4.00
0.0 0.00
Area UA
20.0
5.60
16.0
4.48
20.0
5.60
9.8
2.74
20.0
5.60
32.0
8.96
12.0
3.36
17.8
3.56
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
0.0
0.00
0.0
0.00
0.0
0.00
0.0
0.00
0.01
0.00
0.01
0.00
Sum of Vertical Fenestration Area and UA
Vertical Fenestration Area Weighted U = UA/Area
Overhead Glazing (Skylights)
Component
Width Height
Sum of Overhead Glazing Area and UA
Overhead Glazing Area Weighted U = UA/Area
Total Sum Of Fenestration Area 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
147.61 39.90
0.27
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
167.6 43.90