3088 Prescriptive Worksheet Prescriptive Energy Code Compliance for Climate Zones 6, 5 and Marine 4
Project Information Contact Information
Plan #3088 Freestone Companies
Yelm (253) 896-1300
Rick Carlile Cell (253) 381-6080
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 Date
Climate Zone 5 & Marine 4 6
R-Value a U-Factor a R-Value a U-Factor a
Fenestration U-Factor b n/a 0.30 n/a 0.30
Skylight U-Factor n/a 0.50 n/a 0.50
Glazed Fenestration SHGCb,e n/a n/a n/a n/a
Ceiling 49' 0.026 49 0.026
Wood Frame Wall,,k,l 21 int 0.056 21+5ci 0.044
Mass Wall R-Value' 21/21 h 0.056 21+5 h 0.044
Floor 301 0.029 301 0.029
Below Grade Wall'k 10/15/21 int+TB 0.042 10/15/21 int+TB 0.042
Slab R-Value& Depth 101 2 ft n/a 101 4 ft n/a
*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
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.
02. Medium Dwelling Unit: 1.5 points
All dwelling units that are not included in#1 or#3, including additions over 750 square feet.
❑3. Large Dwelling Unit: 2.5 points
Dwelling units exceeding 5000 square feet of conditioned floor area.
Table R406.2 Summary
Option Description Credit(s)
1 a Efficient Building Envelope 1 a 0.5 ❑
1 b Efficient Building Envelope lb 1.0 ❑
1 c Efficient Building Envelope 1c 2.0 ❑
2a Air Leakage Control and Efficient Ventilation 2a 0.5 ❑
2b Air Leakage Control and Efficient Ventilation 2b 1.0 ❑
2c Air Leakage Control and Efficient Ventilation 2c 1.5 ❑
3a High Efficiency HVAC 3a 0.5 0 0.5
3b High Efficiency HVAC 3b 1.0 ❑
3c High Efficiency HVAC 3c 2.0 ❑
3d High Efficiency HVAC 3d 1.0 ❑
4 High Efficiency HVAC Distribution System 1.0 ❑
5a Efficient Water Heating 0.5 ❑
5b Efficient Water Heating 1.5 0 1.5
6 Renewable Electric Energy 0.5 :]*1200 kwh 0.0
Total Credits 2.00
*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.
"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.
" 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.
The second R-value applies when more than half the insulation is on the interior of the mass wall.
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.
I 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.