APPROVED BLD REV 1+Energy_Calculations+12.15.2022_4.04.22_PM+32720602018 Washington State Energy Code - Residential
Prescriptive Energy Code Compliance for All Climate Zones, m Washington
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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
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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 Date — 1 2L
All Climate Zones (Table R402.1.1)
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 R4021.91..11,
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.S 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
Prescriptive Energy Code Compliance for All Climate Zones in Washington
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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 S00 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 i
heating option User Notes
1
Combustion heating minimum NAECA b
0.0 ❑
... ..._
2
Heat pump`
1.0 E
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 i ❑
....... .. ._..............._ _ __...
Credits - select ONE
Energy
_ Energy Credit Option Descriptions
energy option from each
Options;
category d ....... _ ..... _..._ _..............
1.1
Efficient Building Envelope
0.5 1. ❑
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 El..........
1.7
Efficient Building Envelope
0.5
2.1
Ai
_.._...
2.2
.. .. - ............
Air Leakage Control and Efficient Ventilation
.
1.0 t ❑
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
i
10 j
3.2
. .......... .
High Efficiency HVAC
1.0
❑
3.3'
High Efficiency HVAC
1.5
I
3.4
High Efficiency HVAC
1.5
El
3.5
High Efficiency HVAC
1.5
❑
3.6'
yHighEfficiencyHVAC __._
_.... 2.0
i....... ❑_......._..
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 2
2018 Washington State Energy Code — Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
MINNNUMMIN-M,ngiel`amlly ...RteVu°&dit�feiru 2bi}.x .,
Summary of Table R406.2 (cont.)
Energy i
OptionI i
5.1°
5.2
5.3
5.4
.......
5.5
5.6
..
6.1e
7.1
Energy Credit Option Descriptions (cont.)
Efficient Water Heating
Efficient Water Heating
- ....... ............. - .......... ..
Efficient Water Heating
- -_ _ .......... .
Efficient Water Heating
g _._ ... ........_.... .... ........_
Efficient Water Heating
- _ -
Efficient Water Heating - -.
Renewable Electric Energy (3 credits max)
Appliance Package
, %.IcuM* - Zbcicl-t. WI.& I
energy c ttionn from 1
0.5
0.5 ❑
. _ . ... _..._......
1.0
15 ❑
.._. ..
2 0 ❑
..... _ . ..._
2 5 ❑
.....
1.0 Q
0.5 ❑
User Notes
_
..... ....................... ........
Total credits 3Mj CLEAR FORM
a. An alternative heating source sized at a maximum of 0.5 WJsf (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.
Pleas grin onl es ` through Of this worksheet fiol} St1 3)TSlS 11? (i tc t btrlLdl' `
y iag Y J
Prescriptive Path — Single Family 2018 Washington State Energy Code-R 3