Page 43 - 2018_IRC

DEFINITIONS

fixtures for flushing purposes and is actuated by direct water [MP] GRIDDED WATER DISTRIBUTION SYSTEM. A
pressure. water distribution system where every water distribution pipe
is interconnected so as to provide two or more paths to each
[RB] FOAM BACKER BOARD. Foam plastic used in sid- fixture supply pipe.
ing applications where the foam plastic is a component of the
siding. [RB] GROSS AREA OF EXTERIOR WALLS. The nor-
mal projection of all exterior walls, including the area of all
[RB] FOAM PLASTIC INSULATION. A plastic that is
intentionally expanded by the use of a foaming agent to pro- windows and doors installed therein.
duce a reduced-density plastic containing voids consisting of [MP] GROUND-SOURCE HEAT PUMP LOOP SYS-
open or closed cells distributed throughout the plastic for TEM. Piping buried in horizontal or vertical excavations or
thermal insulating or acoustic purposes and that has a density placed in a body of water for the purpose of transporting heat
3
less than 20 pounds per cubic foot (320 kg/m ) unless it is transfer liquid to and from a heat pump. Included in this defi-
used as interior trim. nition are closed loop systems in which the liquid is recircu-
lated and open loop systems in which the liquid is drawn
[RB] FOAM PLASTIC INTERIOR TRIM. Exposed foam from a well or other source.
plastic used as picture molds, chair rails, crown moldings,
baseboards, handrails, ceiling beams, door trim and window [RB] GUARD. A building component or a system of build-
trim and similar decorative or protective materials used in ing components located near the open sides of elevated walk-
fixed applications. ing surfaces that minimizes the possibility of a fall from the
walking surface to the lower level.
[MP] FUEL-PIPING SYSTEM. All piping, tubing, valves
and fittings used to connect fuel utilization equipment to the [RB] GUESTROOM. Any room or rooms used or intended
point of fuel delivery. to be used by one or more guests for living or sleeping pur-
poses.
[MP] FULL-OPEN VALVE. A water control or shutoff
component in the water supply system piping that, where [RB] GYPSUM BOARD. The generic name for a family of
adjusted for maximum flow, the flow path through the com- sheet products consisting of a noncombustible core primarily
ponent’s closure member is not a restriction in the compo- of gypsum with paper surfacing. Gypsum wallboard, gypsum
nent’s through-flow area. sheathing, gypsum base for gypsum veneer plaster, exterior
gypsum soffit board, predecorated gypsum board and water-
[MP] FULLWAY VALVE. A valve that in the full open resistant gypsum backing board complying with the standards
position has an opening cross-sectional area that is not less listed in Section R702.3 and Part IX of this code are types of
than 85 percent of the cross-sectional area of the connecting gypsum board.
pipe.
[RB] GYPSUM PANEL PRODUCT. The general name for
[MP] FURNACE. A vented heating appliance designed or a family of sheet products consisting essentially of gypsum.
arranged to discharge heated air into a conditioned space or
through a duct or ducts. [RB] HABITABLE SPACE. A space in a building for liv-
ing, sleeping, eating or cooking. Bathrooms, toilet rooms,
[RB] GLAZING AREA. The interior surface area of all closets, halls, storage or utility spaces and similar areas are
glazed fenestration, including the area of sash, curbing or not considered habitable spaces.
other framing elements, that enclose conditioned space.
Includes the area of glazed fenestration assemblies in walls [RB] HANDRAIL. A horizontal or sloping rail intended for
bounding conditioned basements. grasping by the hand for guidance or support.
[MP] HANGERS. See “Supports.”
[RB] GRADE. The finished ground level adjoining the
building at all exterior walls. [MP] HAZARDOUS LOCATION. Any location consid-
ered to be a fire hazard for flammable vapors, dust, combusti-
[MP] GRADE, PIPING. See “Slope.”
ble fibers or other highly combustible substances.
[RB] GRADE FLOOR OPENING. A window or other [MP] HEAT PUMP. An appliance having heating or heating
opening located such that the sill height of the opening is not and cooling capability and that uses refrigerants to extract
more than 44 inches (1118 mm) above or below the finished heat from air, liquid or other sources.
ground level adjacent to the opening. (See also “Emergency
escape and rescue opening.”) [RE] HEATED SLAB. For the definition applicable in
Chapter 11, see Section N1101.6.
[RB] GRADE PLANE. A reference plane representing the
average of the finished ground level adjoining the building at [RB] HEIGHT, BUILDING. The vertical distance from
all exterior walls. Where the finished ground level slopes grade plane to the average height of the highest roof surface.
away from the exterior walls, the reference plane shall be [RB] HEIGHT, STORY. The vertical distance from top to
established by the lowest points within the area between the top of two successive tiers of beams or finished floor sur-
building and the lot line or, where the lot line is more than 6 faces; and, for the topmost story, from the top of the floor fin-
feet (1829 mm) from the building between the structure and a ish to the top of the ceiling joists or, where there is not a
point 6 feet (1829 mm) from the building. ceiling, to the top of the roof rafters.
[MP] GRAY WATER. Waste discharged from lavatories, [RE] HIGH-EFFICACY LAMPS. For the definition appli-
bathtubs, showers, clothes washers and laundry trays. cable in Chapter 11, see Section N1101.6.

18 2018 INTERNATIONAL RESIDENTIAL CODE ®
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