Page 486 - 2018_IRC

ENERGY EFFICIENCY

HISTORIC BUILDING. Any building or structure that is REROOFING. The process of recovering or replacing an
one or more of the following: existing roof covering. See “Roof recover” and “Roof
replacement.”
1. Listed, or certified as eligible for listing by the State
Historic Preservation Officer or the Keeper of the RESIDENTIAL BUILDING. For this chapter, includes
National Register of Historic Places, in the National detached one- and two-family dwellings and townhouses as
Register of Historic Places. well as Group R-2, R-3 and R-4 buildings three stories or less
2. Designated as historic under an applicable state or local in height above grade plane.
law. ROOF ASSEMBLY. A system designed to provide weather
3. Certified as a contributing resource within a National protection and resistance to design loads. The system consists
Register-listed, state-designated or locally designated of a roof covering and roof deck or a single component serving
historic district. as both the roof covering and the roof deck. A roof assembly
includes the roof covering, underlayment, and roof deck, and
INFILTRATION. The uncontrolled inward air leakage into a
building caused by the pressure effects of wind or the effect of can also include a thermal barrier, ignition barrier, insulation
differences in the indoor and outdoor air density or both. or a vapor retarder.
INSULATED SIDING. A type of continuous insulation with ROOF RECOVER. The process of installing an additional
manufacturer-installed insulating material as an integral part of roof covering over a prepared existing roof covering without
the cladding product having an R-value of not less than R-2. removing the existing roof covering.
INSULATING SHEATHING. An insulating board with a ROOF REPAIR. Reconstruction or renewal of any part of
core material having an R-value of not less than R-2. an existing roof for the purposes of its maintenance.
LABELED. Equipment, materials or products to which have ROOF REPLACEMENT. The process of removing the
been affixed a label, seal, symbol or other identifying mark of existing roof covering, repairing any damaged substrate and
a nationally recognized testing laboratory, approved agency installing a new roof covering.
or other organization concerned with product evaluation that R-VALUE (THERMAL RESISTANCE). The inverse of the
maintains periodic inspection of the production of such time rate of heat flow through a body from one of its bounding
labeled items and whose labeling indicates either that the surfaces to the other surface for a unit temperature difference
equipment, material or product meets identified standards or between the two surfaces, under steady state conditions, per
has been tested and found suitable for a specified purpose.
unit area (h • ft • °F/Btu) [(m • K)/W].
2
2
LISTED. Equipment, materials, products or services
included in a list published by an organization acceptable to SERVICE WATER HEATING. Supply of hot water for pur-
the code official and concerned with evaluation of products or poses other than comfort heating.
services that maintains periodic inspection of production of SOLAR HEAT GAIN COEFFICIENT (SHGC). The ratio of
listed equipment or materials or periodic evaluation of ser- the solar heat gain entering the space through the fenestration
vices and where the listing states either that the equipment, assembly to the incident solar radiation. Solar heat gain
material, product or service meets identified standards or has includes directly transmitted solar heat and absorbed solar
been tested and found suitable for a specified purpose. radiation that is then reradiated, conducted or convected into
LOW-VOLTAGE LIGHTING. Lighting equipment powered the space.
through a transformer such as a cable conductor, a rail conduc- STANDARD REFERENCE DESIGN. A version of the pro-
tor and track lighting. posed design that meets the minimum requirements of this
MANUAL. Capable of being operated by personal interven- code and is used to determine the maximum annual energy use
tion (see “Automatic”). requirement for compliance based on total building perfor-
mance.
OPAQUE DOOR. A door that is not less than 50-percent
opaque in surface area. SUNROOM. A one-story structure attached to a dwelling with
PROPOSED DESIGN. A description of the proposed build- a glazing area in excess of 40 percent of the gross area of the
ing used to estimate annual energy use for determining compli- structure’s exterior walls and roof.
ance based on total building performance. THERMAL ISOLATION. Physical and space conditioning
RATED DESIGN. A description of the proposed building separation from conditioned spaces. The conditioned spaces
used to determine the energy rating index. shall be controlled as separate zones for heating and cooling or
conditioned by separate equipment.
READILY ACCESSIBLE. Capable of being reached quickly
for operation, renewal or inspection without requiring those to THERMOSTAT. An automatic control device used to main-
whom ready access is requisite to climb over or remove obsta- tain temperature at a fixed or adjustable set point.
cles or to resort to portable ladders or access equipment (see U-FACTOR (THERMAL TRANSMITTANCE). The coeffi-
“Accessible”).
cient of heat transmission (air to air) through a building compo-
REPAIR. The reconstruction or renewal of any part of an nent or assembly, equal to the time rate of heat flow per unit
existing building for the purpose of its maintenance or to cor- area and unit temperature difference between the warm side
2
2
rect damage. and cold side air films (Btu/h • ft • °F) [W/(m • K)].
2018 INTERNATIONAL RESIDENTIAL CODE ® 461
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.