The 2015 edition of the International Energy Conservation Code,
as published by the International Code Council, Inc., as hereinafter
amended, is hereby adopted as the energy conservation code of the
City of Lubbock, Texas. A copy of said code is attached hereto and
incorporated herein as though set out herein in detail. References
to the energy conservation code or the energy code in this chapter
or to "this code" within this article shall mean and refer to the
2015 edition of the International Energy Conservation Code as amended
herein. One copy of the 2015 International Energy Conservation Code
shall be filed with the city secretary and a copy shall be maintained
in the office of the city building official. All such copies, with
the amendments thereto, shall be open to public inspection during
the usual hours of business of the offices where they are maintained.
(1983 Code, sec. 6-701; Ordinance 2002-O0112, sec. 1, adopted 11/14/2002; Ordinance 2011-O0107, sec. 1,
adopted 11/3/2011; Ordinance
2020-O0019 adopted 2/11/2020)
The administrative provisions contained in chapter
28, articles
28.01 through
28.08 of this Code of Ordinances are applicable to this article; however, for purposes of administering provisions related more specifically to the regulation of energy conservation systems design and installation, these supplemental administrative provisions have been provided. Except as amended or supplemented within sections
28.16.002 and
28.16.003, the entire text of chapter
1 of the 2015 International Energy Conservation Code is deemed to be incorporated herein as though set out herein in detail. Where a conflict arises between a provision contained within sections
28.16.002 and
28.16.003 and articles
28.01 through
28.08 of this Code of Ordinances, it is the intent that the more specific govern, as determined by the building official.
(Ordinance 2011-O0042, sec. 11,
adopted 5/31/2011; Ordinance
2011-O0107, sec. 1, adopted 11/3/2011; Ordinance 2020-O0019 adopted 2/11/2020)
(a) Title.
Sections C101.1 and R101.1 are hereby amended
to read as follows:
C101.1 Title. This code shall be known
as the International Energy Conservation Code of the City of Lubbock,
Texas and shall be cited as such. It is referred to herein as "this
code."
R101.1 Title. This code shall be known
as the International Energy Conservation Code of the City of Lubbock,
Texas and shall be cited as such. It is referred to herein as "this
code."
(b) Administrative amendments and cross-references to articles
28.01 through
28.08.
The following administrative provisions within chapter
1 of the International Energy Conservation Code are hereby stricken, and the corresponding provisions within articles
28.01 through
28.08 of this Code of Ordinances shall govern, as indicated in table 28.16.003 below:
TABLE 28.16.003
ADMINISTRATIVE PROVISIONS CROSS-REFERENCE
|
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2015 International Energy Code Section
|
Section Heading/Subject
|
Refer to Lubbock Code of Ordinances Chapter Section
|
---|
C107.5 and R107.5
|
Fee refunds
|
28.05.109
|
C108.4 and R108.4
|
Violation penalties
|
28.02.006
|
C108 and R108
|
Stop work orders
|
28.02.007
|
C109.1 through C109.3 R109.1 through R109.3
|
Means of appeal
|
2.03.491 through 2.03.495
|
(c) Exempt buildings.
Sections C501 and R501 are hereby
amended to read as follows:
C501.6 and R501.6 Historic buildings. Any building or structure that is listed in the State or National
Register of Historic Places; designated as a historic property under
local or state designation law or survey; certified as a contributing
resource with a National Register listed or locally designated historic
district; or with an opinion or certification that the property is
eligible to be listed on the National or State Registers of Historic
Places either individually or as a contributing building to a historic
district by the State Historic Preservation Officer or the Keeper
of the National Register of Historic Places, are exempt from this
code.
C501.6.1 Hospitals and research laboratories. Hospitals licensed by the State Department of Health Services and
research laboratories containing fume hoods and other HVAC systems
for the protection of occupants shall be exempt from the provisions
of this code.
Exception: Non-residential buildings otherwise exempted by Sections
C501.6 or C501.6.1 above are not exempt from the service water heating
and electrical lighting provisions of this code.
(1983 Code, secs. 6-702–6-723; Ordinance 2002-O0112, secs. 2–23, adopted 11/14/2002; Ordinance 2011-O0042, sec. 10, adopted 5/13/2011; Ordinance 2011-O0107, sec. 1, adopted 11/3/2011; Ordinance 2020-O0019 adopted 2/11/2020)
(a) Interior design conditions.
C302.1 is hereby deleted
in its entirety.
(b) Minimum skylight fenestration area.
C402.4.2 is hereby
amended with additional text that reads:
The minimum skylight fenestration area is not a mandatory guideline
but more as a recommendation. Decisions for use shall be determined
by the design professional or acting representative.
(c) Deadband.
C403.2.4.1.2 is hereby amended to read:
Where used to control both heating and cooling, zone thermostatic
controls shall be capable of providing a temperature range or deadband
of at least 2°F (2.8°C) within which the supply of heating
and cooling energy to the zone is capable of being shut off or reduced
to a minimum.
(d) Economizer fault detection and diagnostics (FDD).
C403.2.4.7
is hereby deleted in its entirety.
(e) Energy recovery ventilation systems.
C403.2.7 is hereby
amended to read:
Where the supply airflow rate of a fan system exceeds the values
specified in Tables C403.2.7(1) and C403.2.7(2), the system shall
include an energy recovery system. The energy recovery system shall
have the capability to provide a change in the enthalpy of the outdoor
air supply of not less than 50 percent of the difference between the
outdoor air and return air enthalpies, at design conditions. Where
an air economizer is installed, the energy recovery system shall include
a bypass or controls which permit operation of the economizer as required
by Section C403.3.
(f) Duct and plenum insulation and sealing.
C403.2.9 is hereby amended to read:
Supply and return air ducts and plenums shall be insulated with a
minimum of R-6 insulation where located in unconditioned spaces and
where located outside the building.
Exceptions:
1. Where located within equipment.
2. Where the design temperature difference between the interior and
exterior of the duct or plenum is not greater than 15°F (8°C).
Ducts, air handlers and filter boxes shall be sealed. Joints
and seams shall comply with Section 603.9 of the International Mechanical
Code
|
(g) Protection of piping insulation.
C403.2.10.1 is hereby
deleted in its entirety.
(h) Mechanical systems commissioning and completion requirements.
C403.2.11 is hereby deleted in its entirety.
(i) Economizers (Prescriptive).
C403.3 is hereby amended
to read:
If a cooling system includes either an air or water economizer
it shall comply with Sections C403.3.1 through C403.3.4
Table C403.3(1) and Table C403.3(2) are hereby deleted in their
entirety.
(j) Fan control.
C403.4.1 is hereby amended to read:
Controls shall be provided for fans in accordance with Sections
C403.4.1.2 through C403.4.1.3.
Section C403.4.1.1 Fan airflow control and Table C403.4.1.1
are hereby deleted in their entirety.
(k) Maximum allowable pipe length method.
C404.5.1 is hereby
deleted in its entirety.
(l) Maximum allowable pipe volume method.
C404.5.2 is hereby amended to read:
The water volume in the piping shall be calculated in accordance
with Section C404.5.2.1. Water heaters, circulating water systems
and heat trace temperature maintenance systems shall be considered
sources of heated water.
The volume from the nearest source of heated water to the termination
of the fixture supply pipe shall be as follows:
1. For all plumbing fixtures or plumbing appliances; not more than 0.5
gallon (1.89 L).
(m) Circulation systems.
C404.6.1 is hereby amended to read:
Heated-water circulation systems shall be provided with a circulation
pump. The system return pipe shall be a dedicated return pipe or a
cold water supply pipe. Gravity and thermo-syphon circulation systems
shall be prohibited. Circulation pump shall be controlled by a seven-day
time clock, aqua stat, or a combination of both devices.
(n) Lighting controls (Mandatory).
C405.2 is hereby amended to read:
Lighting systems shall be provided with controls as specified
in Sections C405.2.1, C405.2.2, C405.2.3, C405.2.4 and C405.2.5.
Exceptions: Lighting controls are not required for the following:
1. Areas designated as security or emergency areas that are required
to be continuously lighted.
2. Interior exit stairways, interior exit ramps and exit passageways.
3. Emergency egress lighting that is normally off.
4. Areas deemed by owner/operator to be a potential health, safety or
security issue.
(o) Occupant sensor controls.
C405.2.1 is hereby deleted
in its entirety.
(p) Commissioning plan.
C408.2.1 is hereby deleted in its
entirety.
(q) Preliminary commissioning report.
C408.2.4 is hereby
deleted in its entirety.
(r) Acceptance of report.
C408.2.4.1 is hereby deleted in
its entirety.
(s) Copy of report.
C408.2.4.2 is hereby deleted in its
entirety.
(t) Functional testing.
C408.3.1 is hereby amended to read:
Prior to passing final inspection provide evidence that the
lighting control systems have been tested to ensure that control hardware
and software are calibrated, adjusted, programmed and in proper working
condition in accordance with the construction documents and manufacturer's
instructions. Functional testing shall be in accordance with Sections
C408.3.1.1 and C408.3.1.2 for the applicable control type.
(Ordinance 2011-O0107, sec. 1, adopted 11/3/2011; Ordinance 2020-O0019 adopted 2/11/2020)
(a) Above code programs.
R102.1.1 is hereby amended to read:
The code official or other authority having jurisdiction shall
be permitted to deem a national, state or local energy-efficiency
program to exceed the energy efficiency required by this code. Buildings
approved in writing by such an energy-efficiency program shall be
considered in compliance with this code.
(b) Information on construction documents.
R103.2 is hereby
deleted in its entirety.
(c) Interior design conditions.
R302.1 is hereby deleted
in its entirety.
(d) Table R402.1.2 Insulation and Fenestration Requirements by Componenta
a -
amend subject portions of table relative to Climate Zone 3 to read:
Fenestration U-Factorb
|
0.50j
|
Skylightb U-Factor
|
0.65
|
Glazed Fenesration SHGCb,e
|
0.30
|
Ceiling R-Value
|
30
|
Wood Frame Wall R-Value
|
13
|
Mass Wall R-Valuei
|
5/8
|
Floor R-Value
|
19
|
Basementc Wall R-Value
|
0
|
Slabd R-Value & Depth
|
0
|
Crawl Spacec Wall R-Value
|
5/13
|
j. For impact rated fenestration complying with Section
R301.2.1.2 of the International Residential Code or Section 1609.1.2
of the International Building Code, the maximum U-factor shall be
0.75 in Zone 2 and 0.65 in Zone 3.
(e) Table R402.1.4 Equivalent U-Factorsa
a - amend subject portions of table relative to Climate Zone 3 to
read:
Fenestration U-Factor
|
0.50
|
Skylight U-Factor
|
0.65
|
Ceiling U-Factor
|
0.035
|
Frame Wall U-Factor
|
0.082
|
Mass Wall U-Factorb
|
0.141
|
Floor U-Factor
|
0.047
|
Basement Wall U-Factor
|
0.360
|
Crawl Space Wall U-Factor
|
0.136
|
(f) Glazed fenestration SHGC exception.
R402.3.2.1 is hereby
drafted to read:
In Climate Zones 1 through 4, permanently shaded vertical fenestration
shall be permitted to satisfy the SHGC requirements. The projection
factor of an overhang, eave, or permanently attached shading device
shall be greater than or equal to the value listed in Table 402.3.2.1
for the appropriate orientation. The minimum projection shall extend
beyond each side of the glazing a minimum of 12 inches (0.3m). Each
orientation shall be rounded to the nearest cardinal orientation (+/-
45 degrees or 0.79 rad) for purposes of calculations and demonstrating
compliance.
Table R402.3.2.1
Minimum Projection Factor Required by Orientation for SHGC Exception
|
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ORIENTATION
|
PROJECTION FACTOR
|
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North
|
>=0.40a
|
South
|
>=0.20
|
East
|
>=0.50
|
West
|
>=0.50
|
a.
|
For the north orientation, a vertical projection located on
the west-edge of the fenestration with equivalent PF >=0.15 shall
also satisfy the minimum projection factor requirement.
|
Projection Factor - The ratio
of the horizontal depth of an overhang, eave, or permanently attached
shading device, divided by the distance measured vertically from the
bottom of the fenestration glazing to the underside of the overhang,
eave, or permanently attached shading device.
(g) Air leakage.
R402.4 is hereby amended to read:
Air leakage. The building thermal envelope
shall be constructed to limit air leakage in accordance with the requirements
of Sections R402.4.1 through R402.4.4.
Exception: Dwelling units of R-2 occupancies and multiple single
family dwellings shall be permitted to comply with IECC Section C402.5.
(h) Testing.
R402.4.1.2
is hereby amended to read:
The building or dwelling unit shall be tested and verified as
having an air leakage rate not exceeding 5 air changes per hour in
Climate Zones 1 through 8. Testing shall be conducted in accordance
with ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2 inch
w.g. (50 Pascals). Testing shall be conducted by an approved third
party. A written report of the results of the test shall be signed
by the party conducting the test and provided to the code official.
Testing shall be performed at any time after creation of all penetrations
of the building thermal envelope.
During testing:
1. Exterior windows and doors, fireplace and stove doors shall be closed,
but not sealed, beyond the intended weather stripping or other infiltration
control measures.
2. Dampers including exhaust, intake, makeup air, backdraft and flue
dampers shall be closed, but not sealed beyond intended infiltration
control measures.
3. Interior doors, if installed at the time of the test, shall be open.
4. Exterior doors for continuous ventilation systems and heat recovery
ventilators shall be closed and sealed.
5. Heating and cooling systems, if installed at the time of the test,
shall be turned off.
6. Supply and return registers, if installed at the time of the test,
shall be fully open.
(i) Fireplaces.
R402.4.2 is hereby deleted in its entirety.
(j) Rooms containing fuel-burning appliances.
R402.4.4 is
hereby deleted in its entirety.
(k) Insulation (Prescriptive).
R403.3.1 is hereby amended
to read:
Supply and return ducts in attics shall be insulated to a minimum
of R-6. Supply and return ducts in other portions of the building
shall be insulated to a minimum of R-6.
(l) Duct testing (Mandatory).
R403.3.3 is hereby deleted
in its entirety.
(m) Duct leakage (Prescriptive).
R403.3.4 is hereby deleted
in its entirety.
(n) Circulation systems.
R403.5.1.1 is herby amended to
read:
Heated water circulation systems shall be provided with a circulation
pump. The system return pipe shall be a dedicated return pipe or a
cold water supply pipe. Gravity and thermosyphon circulation systems
shall be prohibited. Circulation pump shall be controlled by a seven-day
time clock, aqua stat, or a combination of both devices.
(o) Covers.
R403.10.3 is hereby deleted in its entirety.
(p) Table R405.5.2(1) Specifications for the Standard Reference and Proposed
Designs
- amend subject portions of table relative to
referenced building components to read:
BUILDING COMPONENT
|
STANDARD REFERENCE DESIGN
|
PROPOSED DESIGN
|
---|
Vertical fenestration other than opaque doors
|
Total areab = 15 percent of the conditioned
floor area
|
As proposed
As proposed
As proposed
As proposed
As proposed
|
Orientation: equally distributed to four cardinal compass orientations
(N, E, S & W).
|
U-factor: as specified in Table R402.1.4
|
SHGC: as specified in Table R402.1.2 except that for climates
with no requirement (NR) SHGC = 0.40 shall be used.
|
Interior shade fraction: 0.92-(0.21×SHGC for the standard
reference design)
|
External shading: none
|
Air exchange rate
|
Air leakage rate of 5 air changes per hour in climate zones
1 through 8 at a pressure of 0.2 inches w.g (50 Pa). The mechanical
ventilation rate shall be in addition to the air leakage rate and
the same as in the proposed design, but no greater than 0.01 ×
CFA + 7.5 × (Nbr + 1)
|
For residences that are not tested, the same air leakage rate
as the standard reference design.
For tested residences, the measured air exchange ratea.
The mechanical ventilation rateb shall be in addition to the
air leakage rate anad shall be as proposed.
|
where:
CFA = conditioned floor area
Nbr = number of bedrooms
|
Energy recovery shall not be assumed for mechanical ventilation.
|
Heating systemsd, e
|
Fuel type: same as proposed design
|
As proposed
As proposed
As proposed
As proposed
|
Efficiencies: Electric: air- source heat pump with prevailing
federal minimum standards
|
Nonelectric furnaces: natural gas furnace with prevailing federal
minimum standards
|
Nonelectric boilers: natural gas boiler with prevailing federal
minimum standards
|
Capacity: sized in accordance with Section R403.6
|
Cooling systemsd, f
|
Fuel type: Electric
|
As proposed
As proposed
|
Efficiency: In accordance with prevailing federal minimum standards
|
Capacity: sized in accordance with section R403.6
|
Service water heatingd, e, f, g
|
Fuel type: same as proposed design
|
As proposed
Same as standard reference
Same as standard reference
|
Efficiency: In accordance with prevailing federal minimum standards
|
Use: gal/day = 30 + 10 x Nbr Tank temperature:
120º
|
(Ordinance 2020-O0019 adopted 2/11/2020)