Energy Code Worksheet2018 Washington State Energy Code - Residential
EnerRV Code Compliance for All Climate Zones in
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
FL2-3006
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 U-Factorb
n/a
0.30
Skylight U-Factor b
n/a
0.50
Glazed Fenestration SHGC
n/a
n/a
Ceiling a
491
0.026
Wood Frame Wall g•"
21 int
0.056
Floor
30
0.029
Below Grade Wall `•b
10/15/21 int + TB
0.042
Slab °•r R-Value & Depth
10, 2 it
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
IThe 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
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 Washington State Energy Code-R
2018 Washington State Energy Code - Residential
EnerRv 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 41 or 43
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 Normalization Descriptions
Credits - select ONE
heating option
User Notes
1
Combustion heating minimum NAECA'
0.0
❑
2
Heat pump`
1.0
0
3
Electric resistance heat only - furnace or zonal
-1.0
❑
4
5
DHP with zonal electric resistance per option 3A
All other heating systems
0.5
-1.0
❑
❑
Energy
Options
p
Energy Credit Option Descriptions
Credits - select ONE
energy option from each
category
1.1
Efficient Building Envelope
0.5
I ❑
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
0
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
❑
3.1a
High Efficiency HVAC
1.0
_
❑
0
3.2
High Efficiency HVAC
1.0
3.3'
High Efficiency HVAC
1.5 I
❑
3.4
High Efficiency HVAC
1.5
❑
3.5
High Efficiency HVAC
1.5
❑
1W
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
EnerRv Code Compliance for All Climate Zones in
Summary of Table R406.2 (cont.)
Energy
Options
p
Energy Credit Option Descriptions (cont.)
-Credits- select ONE
energy option from
each category
j User Notes
S.V
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
5.6
Efficient Water Heating
Efficient Water Heating
2.0
2.5
❑
6.1e
Renewable Electric Energy (3 credits max)
1.0
7.1
Appliance Package
1 0.5
❑
Total Credits
1
( 6 0
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
Iple Heating System Size: Washington State
heating system sizing calculator Is based on the Prescriptive Requirements of the 2018 Washington State Energy Code (WSEC) and ACCA
rals 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. If you do not see the selection you need in the drop -down options, please contact the WSU Energy Program at
Bode@energysysu.edu or (360) 956-2042 for assistance.
Project Information Contact Information
1-2-3005
Heating System Type: 0w1 aver Systems oO Heat Pump
To see detailed instructions foreach section, place yourcursor on the word 'Instructions"
Design Temperature
Instructions Design Temperature Difference (AT)
�; Lacer ;
dT = IMoorp0 degrees) - Ou!doorpesgn Temp
Area of Building
Conditioned Floor Area
Instructions Conditioned Floor Area (sq f0
Average Ceiling Height
Conditioned Volume
Instrnctons Average Ceiling Height 111)
_. 815
25,551
Glazing and Doors
U-Factor
X Area -
UA
Instructions -
u o za
n
0.280
443
124.04
Skylights
U-Factor
X Area
UA
Instructions
0.50
Insulation
Attic
U-Factor
X Area =
UA
Instrucions
R-49
0.026
1,954
50.80
Single Rafter or Joist -Vaulted Collings _
U-Factor
X Area
UA
Instructions
18e!ect R-vane
.n
No selection
---
Above Grade Walls (see Figure 1)
U-Factor
X Area
UA
Instructions
u a-21 Intermediate
V
0.056
2,730 +
152.88
Floors
U-Factor
X Area
UA
Instructions
` R-38
0.025
1,790 ;
44.75
Below Grade Walls (see Figure l).__
U-Factor
X Area
UA
Instructions
Selttt R-va'ue
No selection
Slab Below Grade
(see Figure 0
F-Factor
X Length
UA
mstrrmtions
�`selea conatiminy
No selection
---
Slab on Grade (see
Figure 11
F-Factor
X Length
UA
Instructions
6r. selectRvalue
No selection
Location of Ducts
Instructions
Duct
Leakage Coefficient
Conditioned space��
1.00
Sum
of UA
372.47
Figure 1.
Above Grade
53
Envelope Heat Load 19,741
Btu/Hour
Sum or UA x AT
Air Leakage Heat Load 14,625
Btu / Hour
Volumex 0.6x ATx0.018
Building Design Heat Load 34,367
Btu / Hour
Airleakage + envelope heat loss
Building and Duct Heat Load 34,367
Btu / Hour
Ducts 1n 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 42,958
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
(07101113)
Window, Skylight and Door Schedule
Project Information
L2-3006
Exempt Swinging Door (24 sq. ft. max.)
Exempt Glazed Fenestration (15 sq. ft. max.)
Vertical Fenestration (Windows and doors)
Component
Ref. U-factor
IM( IPPMYI9Pl1
Contact Information
Width Height
Qt. Feet Inch Feet inch
Width Height
Qt. Feet Inch Feet Inch
Area UA
Area UA
,1
Overhead Glazing (Skylights)
Component
Sum of Vertical Fenestration Area and UA
Vertical Fenestration Area Weighted U = UA/Area
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)
Area UA
M�
442.8 120.64
442.8 120.64