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_)
Fenestration U-Factor b
R-Value ' _
n/a
_
U-Factor'
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 e,h
21 int
0.056
Floor
30
0.029
Below Grade Wall `•h
10/15/21int+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 specified in the table.
b The fenestration U-factor column excludes skylights.
"10/15/21 +5TB" 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 +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.
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 Path — 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.
- - -
Summary of Table R406.2
Heating
Options
Fuel Normalisation Descriptions
Credits - select ONE
heating option
User Notes
1
Combustion heating minimum NAECAb
0.0
❑
2
Heat pump`
1.0
El
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
category
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
1 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 Path -Single Family 2018 Washington State Energy Code-R
2018 Washington State Energy Code - Residential
Energy Code Compliance for All Climate Zones in'
Summary of Table R406.2 (cont,)
Energy Credits-selectONE�
Options Energy Credit Option Descriptions (cont.) energy option from User Notes
each c�gory
5.1d Efficient Water Heating 0.5 ❑
5.2
Efficient Water Heating
0.5
❑_
5.3 _
_
Efficient Water Heating _
1.0
❑
5.4 _
Efficient Water Heating _
1.5
❑
5.5
Efficient Water Heating
2.0
❑
5.6
Efficient Water Heating
2,5
❑
6.10
Renewable Electric Energy (3 credits max)
1.0
7.1
Appliance Package
0.5
❑
Total Credits
6.0
CLEARFORM
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:
acing system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State 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
vill 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
:ode@energy.wsu.edu or (360) 956-2042 for assistance.
,m uw vuunneOOe
Contact Information
2978 !
Pleating System Type: oml mensystems
OO ueat Pump
To see detailed instructions for each section, place your cursor on the word "Instructions"
Design Temperature
Instructions -- -- - ----
r
- Design Temperature
Difference (AT)
53
AT=W.cr(76 degress)-Outdoo.pesiIgn Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq fl)
2,969
Average Coiling Height
Conditioned Volume
Instructions Average Ceiling Height (ft)
8:5
25,237
Glazing and Doors
U-Factor X
Area —
UA
Instructions _
u-oza
0.280
346
96.88
Skylights
U-Factor X
Area
UA
Instructions
0.50
---
Insulation
Attic _
U-Factor X
Area =
UA
Instructions'
0.026
1,679 143.85
Single Rafter or Joist Vaulted Callings
U-Factor X
Area
UA
Instructions 5elxt awame
No selection
---
Above Grade Walls (.so Fi u.n 1)
U-Factor X
Area
UA
Instructions 'R-L lntenncdiate
0.056
2,640 !
147.84
Floors
U-Factor X
Area
UA
Instructions a -as
® 0.025
1,690 ":
42.25
Below Grade Walls (,ea Fig... g
U-Factor X
Area
UA
Instructions MR -value
` No selection::;
IVA
Slab Below Grade (sea Fraud �)
F-Factor X
Length
UA
Instructions sec uoWg
�� m' No selection
Slab on Grade (,ea Fl9u.e 11
F-Factor X
Length
UA
Insimm�ons "' '
selnta-VaWe
-
- No selection
---
Location of Ducts
Instmctions -:.- - -
`� coMitlor� sw<e
Duct Leakage Coefficient
r
1.00
Sum of UA
330.62
Envelope Heat Load 17,523
Figure 1.
Btu/Hour
Sum of UA x AT
Air Leakage Heat Load 14,445
Btu / Hour
Volumex 0.6x ATx0.018
Building Design Heat Load 31,968
Btu / Hour
..z Air leakage + envelope heat loss
....... "` Building and Duct Heat Load 31,968
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 39,961
Btu / Hour
Building and duct heat loss x 1.40 for forced air furnace
Building and duct heat loss x 1.25 forheat pump
(01/011B)
Window, Skylight and Door Schedule
Project Information
12978
Ref. U-factor
Exempt Swinging Door (24sq. ft. noax]
Exempt Glazed Fenestration (15sq. ft. noax]
Vertical Fenestration (Windows and doors)
Component
Contact Intorn)atiom
Width Height
Qt. Feet Inch Feet Inch
Width Height
^ ;~
Qt. Feet I
MEEMEMM
BOMEME
ONMEMN
EIMEME
EIMEME
ENMEMO
SOME
MMEME
MMEEM
INIMEME
INIMEEM
COMEME
ENEMM
MMEME
MMEME
MMEME
MMEME
NEENINE
MMEME
MMEME
MMEME
ENEEEM
NEME
MMEME
MMEME
MMEME
IMEME
IEMEMO
MMEME
MMEME
NOME
MMEME
MMEEMI
Area UA
EZEIEB
MOOD
MONS
EUNEO
OUNIBB
ENORO
MONS
MEW
EBI
MERB
NRNEO
EREEO
MOBB
NOMM
MEEB
MEW
MEBB
ORNIEB
EREIEB
NEMW
EEMM
Overhead Glazing (Skylights)
Component
Sum of Vertical Fenestration Area and UA
Vertical Fenestration Area Weighted U = UA/Area
Ref.
Width Height
Cit. Feet Inch Feet Inch
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)
345.51 96.74
0.28
Area UA
365.5 100.74