|Description / Abstract
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|This code applies to commercial buildings and the
buildings sites and associated systems and equipment.
Applicability. Where, in any specific case,
different sections of this code specify different materials,
methods of construction or other requirements, the most restrictive
shall govern. Where there is a conflict between a general
requirement and a specific requirement, the specific requirement
Existing buildings. Except as specified in this
chapter, this code shall not be used to require the removal,
alteration or abandonment of, nor prevent the continued
use and maintenance of, an existing building or building system
lawfully in existence at the time of adoption of this code.
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.
Additions, alterations, renovations or repairs.
Additions, alterations, renovations or repairs to an existing
building, building system or portion thereof shall conform to the
provisions of this code as they relate to new construction without
requiring the unaltered portion(s) of the existing building or
building system to comply with this code. Additions, alterations,
renovations or repairs shall not create an unsafe or hazardous
condition or overload existing building systems. An addition shall
be deemed to comply with this code if the addition alone complies
or if the existing building and addition comply with this code as a
Exception: The following need not comply
provided the energy use of the building is not increased:
1. Storm windows installed over existing fenestration.
2. Glass only replacements in an existing sash and frame.
3. Existing ceiling, wall or floor cavities exposed during
construction provided that these cavities are filled with
4. Construction where the existing roof, wall or floor cavity is
5. Reroofing for roofs where neither the sheathing nor the
insulation is exposed. Roofs without insulation in the cavity and
where the sheathing or insulation is exposed during reroofing shall
be insulated either above or below the sheathing.
6. Replacement of existing doors that separate conditioned
space from the exterior shall not require the installation of
a vestibule or revolving door, provided, however, that an existing
vestibule that separates a conditioned space from
the exterior shall not be removed,
7. Alterations that replace less than 50 percent of the
luminaires in a space, provided that such alterations do not
increase the installed interior lighting power.
8. Alterations that replace only the bulb and ballast within the
existing luminaires in a space provided that the
alteration does not increase the installed interior
Change in occupancy or use. Spaces undergoing a
change in occupancy that would result in an increase in demand for
either fossil fuel or electrical energy shall comply with this
code. Where the use in a space changes from one use in Table
C405.5.2(1) or (2) to another use in Table C405.5.2(1) or (2), the
installed lighting wattage shall comply with Section C405.5.
Change in space conditioning. Any
nonconditioned space that is altered to become conditioned
space shall be required to be brought into full compliance
with this code.
Mixed occupancy. Where a building includes both
residential and commercial occupancies, each
occupancy shall be separately considered and meet the applicable
provisions of IECC—Commercial Provisions or IECC—Residential
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