o improve implementation of existing amendments.

Resolution 30280 (Section 1.B.i) directs DPD and Seattle City Light to propose to the City
Councilamendments to the Seattle Energy Codeto achieve up to 20% enhanced energy
efficiency beyond the current version of ASHRAE/IESNA Standard 90.1. The 2004 Seattle
Energy Code achieved approximately 20% energy savings compared to ASHRAE/IESNA
Standard 90.1-1999. However, since that time, ASHRAE/IESNA Standard 90.1-2004 has been
published and it contains significant energy efficiency improvements (particularly in lighting).
Consequently, it is estimated that the existing Seattle Energy Code only achieves 10% energy
savings compared to ASHRAE/IESNA Standard 90.1-2004. Therefore, for the 2006 Seattle
Energy Code update, the net energy savings from new amendments would be 10%.

DPD has scheduled a series of meetings to discuss these proposed amendments. All meetings
will take place 7:30 - 9:00 am, Seattle Municipal Tower (SMT), Room 1650, 700 Fifth Avenue.

1 February 2007 (Thursday): Building Envelope & Lighting

8 February 2007 (Thursday): Mechanical (SMT-1660, this meeting only)
15 February 2007 (Thursday): follow-up from previous meetings (as necessary)

22 March 2007 (Thursday): wrap-up (as necessary)

The deadline for written comments is Tuesday, 20 February 2007. Submit comments by E-mail to
john.hogan@seattle.gov
, or Fax to John Hogan at 206-233-7902, or Mail to John Hogan, Seattle DPD, 700 Fifth Avenue, Suite 2006, P.O Box 34019, Seattle
WA 98124-4019
If possible, please propose specific language changes with underline to indicate new language
and strikethrough to indicate deletions.

The goal is for the CCAB to make their recommendations in March. DPD would then consider
these recommendations and forward an ordinance to the Mayor and City Council shortly
thereafter. City Council consideration would occur in late Spring, with an effective date this
summer (consistent with other Seattle code updates). Summary of Proposed 2006 Seattle Energy Code, 25 January 2007, page 2

SUMMARY OF
2006 SEATTLE ENERGY CODE PROPOSAL

Consistent with the current Seattle Energy Code, the plan is for the 2006 Seattle Energy Code
(the update to be adopted this spring and effective this summer) to consist of the 2006
Washington State Energy Code with Seattle amendments to the nonresidential sections.
As is the case with the current Seattle Energy Code, there are no proposed Seattle residential
amendments to the Washington State Energy Code (though the Washington State Building Code
Council did adopt residential amendments that will be in the 2006 WSEC).

All of the Seattle amendments are summarized below in section number order and include: Section number and title. Discussion: This contains a summary of the issues and the source of the language if it has
been taken from another document, such as ASHRAE/IESNA Standard 90.1-2004.
(Standard 90.1 is cited in the 1992 National Energy Policy Act as the basis for Energy Codes
in all 50 states. Previous versions of the Seattle Energy Code have drawn substantially from
this document and its predecessors.)
- No Seattle changes (retain existing Seattle amendment) indicates that the 2006 Seattle
amendment is the same as an existing 2004 Seattle amendment, or revised only to reflect
partial adoption into the 2006 Washington State Energy Code.
- Changes to Seattle amendments or new Seattle amendments are shown by a bar in the
margin. Proposal: This contains the proposed text. All strikethroughs and underlines show changes
from the 2006 Washington State Energy Code.

EXISTING SEATTLE AMENDMENTS TO BE RETAINED NO CHANGES
The Seattle amendments to the following sections and tables are proposed to be retained with no
changes:

1301 Building Envelope Scope.
1311.6 Radiant Floors.

1312.2 Solar Heat Gain Coefficient and Shading Coefficient.

1322 Opaque Envelope.
1323 Glazing.
1333 UA Calculations.
1513.1 Local Control and Accessibility.
1513.3 Daylight Zone Control.

EXISTING SEATTLE AMENDMENTS TO BE RETAINED MINOR CHANGES
The Seattle amendments to the following sections were partially adopted into the 2006
Washington State Energy Code and are modified to reflect that partial adoption: Summary of Proposed 2006 Seattle Energy Code, 25 January 2007, page 3

1331 Component Performance Option.
1512 Exempt Lighting.
1532 Exterior Lighting Power Allowance.

EXISTING SEATTLE AMENDMENTS NO LONGER NEEDED STATE ADOPTION
The previous Seattle amendments to the following sections have been incorporated into the 2006
Washington State Energy Code and so are no longer needed:

1310.2 Semi-Heated Spaces.
1501 Scope.
1510 General.
1513.5 Automatic Shut-Off Controls, Exterior.
1530 Lighting Power Allowance Option.
1540 Transformers.
Table 15-1 Interior Lighting Power Allowances.

PROPOSED AMENDMENTS
Amendments are proposed for the following: 1310.2: Clarify that semi-heated spaces are calculated separately from other conditioned
spaces. Table 13-1: Increase insulation levels and improve glazing heating and cooling performance. Table 15-1: Reduce lighting power allowances to 0.9 W/ft
2
for office and
2.7 W/ft
2
(1.5 + 1.2) retail, insert ceramic metal halide and other HID. Summary of Proposed 2006 Seattle Energy Code, 25 January 2007, page 4

1301 Scope.
Discussion: No Seattle changes (retain existing Seattle amendment).
Proposal: Amend 2006 WSEC as follows -
1301 Scope: Conditioned buildings or portions thereof shall be constructed to provide the
required thermal performance of the various components according to the requirements of this
chapter. Unless otherwise approved by the building official, all spaces shall be assumed to be
at least semi-heated.
EXCEPTIONS: 1. Greenhouses isolated from any conditioned space and not intended for occupancy.
2. As approved by the building official, spaces not assumed to be at least semi-heated.
3. Unconditioned Group ((M))U occupancy accessory to Group R occupancy.
4. Unstaffed equipment shelters or cabinets used solely for personal wireless service facilities.

5. Parking lot attendant booths no larger than 100 square feet, provided that the roof insulation is R-21 minimum and
the wall insulation is R-13 minimum, unless otherwise allowed by Section 1310.
1310.2 Semi-Heated Spaces.
Discussion: Clarify that semi-heated spaces are calculated separately from other conditioned
spaces. (Note that previous Seattle amendment to this section was incorporated into the 2006
Washington State Energy Code and so is no longer needed.)
Proposal: Amend 2006 WSEC as follows -
1310.2 Semi-Heated Spaces: All spaces shall be considered conditioned spaces, and shall
comply with the requirements in Section 1310.1 unless they meet the following criteria for
semi-heated spaces. The installed heating equipment output, in Climate Zone 1, shall be 3
Btu/(h ft
2
) or greater but not greater than 8 Btu/(h ft
2
) and in Climate Zone 2, shall be 5
Btu/(h ft
2
) or greater but not greater than 12 Btu/(h ft
2
).

For semi-heated spaces, the building envelope shall comply with the same requirements
as that for conditioned spaces in Section 1310.1. However, semi-heated spaces shall be
calculated separately from other conditioned spaces for compliance purposes.
EXCEPTION: Fore semi-heated spaced heated by other fuels only, wall insulation is not required for those walls that
separate semi-heated spaces (see definition in Section 201.1) from the exterior provided that the space is heated solely
by a heating system controlled by a thermostat with a maximum setpoint capacity of 45ºF, mounted no lower than the
heating unit.

1311.6 Radiant Floors.
Discussion: No Seattle changes (retain existing Seattle amendment).
Proposal: Amend 2006 WSEC as follows -
1311.6 Radiant Floors (on or below grade): Slab-on-grade insulation shall extend
downward from the top of the slab a minimum distance of 36 inches or downward to the top of
the footing and horizontal for an aggregate of not less than 36 inches.
((If required by the building official where soil conditions warrant such insulation, t)) The
entire area of a radiant floor shall be thermally isolated from the soil. Where a soil gas control
system is provided below the radiant floor, which results in increased convective flow below
the radiant floor, the radiant floor shall be thermally isolated from the sub-floor gravel layer. Summary of Proposed 2006 Seattle Energy Code, 25 January 2007, page 5

1312.2 Solar Heat Gain Coefficient and Shading Coefficient.
Discussion: No Seattle changes (retain existing Seattle amendment).
Proposal: Amend 2006 WSEC as follows -
1312.2 Solar Heat Gain Coefficient and ((Shading Coefficient))Visible Transmittance:
Solar Heat Gain Coefficient (SHGC) and Visible Transmittance (VT), shall be determined,
certified and labeled in accordance with the National Fenestration Rating Council (NFRC)
Standard by a certified, independent agency, licensed by the NFRC.

EXCEPTIONS: 1. Shading coefficients (SC) or solar heat gain coefficient for the center of glass shall be an acceptable
alternate for compliance with solar heat gain coefficient requirements. Shading coefficients or solar heat gain coefficient
for the center of glass for glazing shall be taken from Chapter 31 of Standard RS-1 or fro