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DEFINITIONS

dimensional changes. Permanent loads are those loads in Reinforced masonry. Masonry construction in which
which variations over time are rare or of small magnitude, reinforcement acting in conjunction with the masonry is
such as dead loads. All other loads are variable loads (see used to resist forces.
“Nominal loads”). Solid masonry. Masonry consisting of solid masonry
[BG] LODGING HOUSE. A one-family dwelling where units laid contiguously with the joints between the units
one or more occupants are primarily permanent in nature and filled with mortar.
rent is paid for guest rooms. Unreinforced (plain) masonry. Masonry in which the
[A] LOT. A portion or parcel of land considered as a unit. tensile resistance of masonry is taken into consideration
[A] LOT LINE. A line dividing one lot from another, or and the resistance of the reinforcing steel, if present, is
from a street or any public place. neglected.
[BE] LOW-ENERGY POWER-OPERATED DOOR. A [BS] MASONRY UNIT. Brick, tile, stone, glass block or
swinging, sliding or folding door that opens automatically concrete block conforming to the requirements specified in
upon an action by a pedestrian such as pressing a push plate Section 2103.
or waving a hand in front of a sensor. The door closes auto- Hollow. A masonry unit whose net cross-sectional area in
matically, and operates with decreased forces and decreased any plane parallel to the load-bearing surface is less than
speeds (see “Power-assisted door” and “Power-operated 75 percent of its gross cross-sectional area measured in
door”). the same plane.
[F] LOWER FLAMMABLE LIMIT (LFL). The minimum Solid. A masonry unit whose net cross-sectional area in
concentration of vapor in air at which propagation of flame every plane parallel to the load-bearing surface is 75 per-
will occur in the presence of an ignition source. The LFL is cent or more of its gross cross-sectional area measured in
sometimes referred to as “LEL” or “lower explosive limit.” the same plane.
[BS] LOWEST FLOOR. The lowest floor of the lowest [BF] MASTIC FIRE-RESISTANT COATINGS. Liquid
enclosed area, including basement, but excluding any unfin- mixture applied to a substrate by brush, roller, spray or trowel
ished or flood-resistant enclosure, usable solely for vehicle that provides fire-resistant protection of a substrate when
parking, building access or limited storage provided that such exposed to flame or intense heat.
enclosure is not built so as to render the structure in violation [BE] MEANS OF EGRESS. A continuous and unobstructed
of Section 1612. path of vertical and horizontal egress travel from any occu-
[BS] MAIN WINDFORCE-RESISTING SYSTEM. An pied portion of a building or structure to a public way. A
assemblage of structural elements assigned to provide sup- means of egress consists of three separate and distinct parts:
port and stability for the overall structure. The system gener- the exit access, the exit and the exit discharge.
ally receives wind loading from more than one surface
[BG] MECHANICAL-ACCESS OPEN PARKING
MALL BUILDING, COVERED and MALL BUILDING, GARAGES. Open parking garages employing parking
OPEN. See “Covered mall building.” machines, lifts, elevators or other mechanical devices for
[F] MANUAL FIRE ALARM BOX. A manually operated vehicles moving from and to street level and in which public
device used to initiate an alarm signal. occupancy is prohibited above the street level.
[A] MANUFACTURER’S DESIGNATION. An identifica- [BF] MECHANICAL EQUIPMENT SCREEN. A rooftop
tion applied on a product by the manufacturer indicating that structure, not covered by a roof, used to aesthetically conceal
a product or material complies with a specified standard or plumbing, electrical or mechanical equipment from view.
set of rules (see “Label” and “Mark”). [BG] MEDICAL CARE. Care involving medical or surgical
[A] MARK. An identification applied on a product by the procedures, nursing or for psychiatric purposes.
manufacturer indicating the name of the manufacturer and the [BG] MEMBRANE-COVERED CABLE STRUCTURE.
function of a product or material (see “Label” and “Manufac- A nonpressurized structure in which a mast and cable system
turer’s designation”). provides support and tension to the membrane weather bar-
[BG] MARQUEE. A canopy that has a top surface which is rier and the membrane imparts stability to the structure.
sloped less than 25 degrees from the horizontal and is located [BG] MEMBRANE-COVERED FRAME STRUCTURE.
less than 10 feet (3048 mm) from operable openings above or A nonpressurized building wherein the structure is composed
adjacent to the level of the marquee. of a rigid framework to support a tensioned membrane which
[BS] MASONRY. A built-up construction or combination of provides the weather barrier.
building units or materials of clay, shale, concrete, glass, gyp- [BF] MEMBRANE PENETRATION. A breach in one side
sum, stone or other approved units bonded together with or of a floor-ceiling, roof-ceiling or wall assembly to accommo-
without mortar or grout or other accepted methods of joining. date an item installed into or passing through the breach.
Glass unit masonry. Masonry composed of glass units [BF] MEMBRANE-PENETRATION FIRESTOP. A
bonded by mortar. material, device or construction installed to resist for a pre-
Plain masonry. Masonry in which the tensile resistance of scribed time period the passage of flame and heat through
the masonry is taken into consideration and the effects of openings in a protective membrane in order to accommodate
stresses in reinforcement are neglected. cables, cable trays, conduit, tubing, pipes or similar items.

2018 INTERNATIONAL BUILDING CODE ® 31
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