2394 A1 Prescriptive WorksheetPrescriptive Energy Code Compliance for Climate Zones 6, 5 and Marine 4
Project Information
Plan # 2394
Pierce County
This project will use the requirements of the Prescriptive Path below and incorporate the
the minimum values listed. In addition, based on the size of the structure, the appropriate
number of additional credits are checked as chosen by the permit applicant.
Authorized Representative _________________________________________________
Climate Zone
Fenestration U-Factorb
Skylight U-Factor
Glazed Fenestration SHGCb,e
Ceiling
Wood Frame Wallg,k,l
Mass Wall R-Valuei
Floor
Below Grade Wallc,k
Slabd R-Value & Depth
*Table R402.1.1 and Table R402.1.3 Footnotes included on Page 2.
Each dwelling unit in one and two-family dwellings and townhouses, as defined in Section 101.2 of the International Residential Code shall comply with sufficient options from Table R406.2
so as to achieve the following minimum number of credits:
1. Small Dwelling Unit: 0.5 points
2. Medium Dwelling Unit: 1.5 points
3. Large Dwelling Unit: 2.5 points
Table R406.2 Summary
Option
1a
1b
1c
2a
2b
2c
3a
3b
3c
3d
4
5a
5b
6
Total Credits
*Please refer to Table R406.2 for complete option descriptions
http://www.energy.wsu.edu/Documents/2012%20Res%20Energy.pdf
Table R402.1.1 Footnotes
For SI: 1 foot .= 304.8 mm, ci .= continuous insulation, int .= intermediate framing.
a R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less 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. The SHGC column applies to all glazed fenestration. Exception: Skylights may be excluded from glazed fenestration SHGC requirements
in Climate Zones 1 through 3 where the SHGC for such skylights does not exceed 0.30.
c "10/15/21.+TB" means R-10 continuous insulation on the exterior of the wall, or R-15 on the 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 the interior of the basement wall. "10/15/21.+TB" 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. "10/13" means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation
at the interior of the basement wall. "TB" means thermal break between floor slab and basement wall.
d R-10 continuous insulation is required under heated slab on grade floors. See R402.2.9.1.
e There are no SHGC requirements in the Marine Zone.
f Basement wall insulation is not required in warm-humid locations as defined by Figure R301.1 and Table R301.1.
g Reserved.
h First value is cavity insulation, second is continuous insulation or insulated siding, so "13.+5" means R-13 cavity insulation plus R-5 continuous insulation or insulated siding. If
structural sheathing covers 40 percent or less of the exterior, continuous insulation R-value shall be permitted to be reduced by no more than R-3 in the locations where structural sheathing
is used to maintain a consistent total sheathing thickness.
i The second R-value applies when more than half the insulation is on the interior of the mass wall.
j For single rafter- or joist-vaulted ceilings, the insulation may be reduced to R-38.
k Int. (intermediate framing) denotes standard framing 16 inches on center with headers insulated with a minimum of R-10 insulation.
l Log and solid timber walls with a minimum average thickness of 3.5 inches are exempt from this insulation requirement.
Table R402.1.3 Footnote
a Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source or as specified in Section R402.1.3.
Dwelling units less than 1500 square feet in conditioned floor area with less than 300 square feet of fenestration area. Additions to existing building that are less than 750 square
feet of heated floor area.
All dwelling units that are not included in #1 or #3, including additions over 750 square feet.
Dwelling units exceeding 5000 square feet of conditioned floor area.
Description
Efficient Building Envelope 1a
Efficient Building Envelope 1b
Efficient Building Envelope 1c
Air Leakage Control and Efficient Ventilation 2a
Air Leakage Control and Efficient Ventilation 2b
Air Leakage Control and Efficient Ventilation 2c
High Efficiency HVAC 3a
High Efficiency HVAC 3b
High Efficiency HVAC 3c
High Efficiency HVAC 3d
High Efficiency HVAC Distribution System
Efficient Water Heating
Efficient Water Heating
Renewable Electric Energy
5 & Marine 4
R-Valuea
n/a
n/a
n/a
49j
21 int
21/21h
30g
10/15/21 int + TB
10, 2 ft
U-Factora
0.3
0.5
n/a
0.026
0.056
0.056
0.029
0.042
n/a
Contact Information
Freestone Companies
(253) 896-1300
Rick Carlile Cell (253) 381-6080
Credit(s)
0.5
1
2
0.5
1
1.5
0.5
1
2
1
1
0.5
1.5
0.5
Date ___________________________
6
R-Valuea
n/a
n/a
n/a
49
21+5ci
21+5h
30g
10/15/21 int + TB
10, 4 ft
*1200 kwh
U-Factora
0.3
0.5
n/a
0.026
0.044
0.044
0.029
0.042
n/a
0.5
1.5
0
2
True
True
True
False
True
False
False
False
False
False
False
True
False
False
False
False
False
True