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DEFINITIONS

[BS] DANGEROUS. Any building, structure or portion [BF] DELAYED-ACTION CLOSER. A self-closing
thereof that meets any of the conditions described below shall device that incorporates a delay prior to the initiation of clos-
be deemed dangerous: ing. Delayed-action closers are mechanical devices with an
1. The building or structure has collapsed, has partially adjustable delay.
collapsed, has moved off its foundation or lacks the [F] DELUGE SYSTEM. A sprinkler system employing
necessary support of the ground. open sprinklers attached to a piping system connected to a
2. There exists a significant risk of collapse, detachment water supply through a valve that is opened by the operation
or dislodgment of any portion, member, appurtenance of a detection system installed in the same areas as the sprin-
or ornamentation of the building or structure under ser- klers. When this valve opens, water flows into the piping sys-
vice loads. tem and discharges from all sprinklers attached thereto.
[F] DAY BOX. A portable magazine designed to hold explo- [BS] DESIGN DISPLACEMENT. See Section 1905.1.1.
sive materials constructed in accordance with the require- [BS] DESIGN EARTHQUAKE GROUND MOTION. The
ments for a Type 3 magazine as defined and classified in earthquake ground motion that buildings and structures are
Chapter 56 of the International Fire Code. specifically proportioned to resist in Section 1613.
[BS] DEAD LOAD. The weight of materials of construction [BS] DESIGN FLOOD. The flood associated with the
incorporated into the building, including but not limited to greater of the following two areas:
walls, floors, roofs, ceilings, stairways, built-in partitions,
finishes, cladding and other similarly incorporated architec- 1. Area with a flood plain subject to a 1-percent or greater
tural and structural items, and the weight of fixed service chance of flooding in any year.
equipment, such as cranes, plumbing stacks and risers, elec- 2. Area designated as a flood hazard area on a commu-
trical feeders, heating, ventilating and air-conditioning sys- nity’s flood hazard map, or otherwise legally desig-
tems and automatic sprinkler systems. nated.
[BS] DECORATIVE GLASS. A carved, leaded or Dalle [BS] DESIGN FLOOD ELEVATION. The elevation of the
glass or glazing material whose purpose is decorative or artis- “design flood,” including wave height, relative to the datum
tic, not functional; whose coloring, texture or other design specified on the community’s legally designated flood hazard
qualities or components cannot be removed without destroy- map. In areas designated as Zone AO, the design flood eleva-
ing the glazing material and whose surface, or assembly into tion shall be the elevation of the highest existing grade of the
which it is incorporated, is divided into segments. building’s perimeter plus the depth number (in feet) specified
[F] DECORATIVE MATERIALS. All materials applied on the flood hazard map. In areas designated as Zone AO
over the building interior finish for decorative, acoustical or where a depth number is not specified on the map, the depth
other effect including, but not limited to, curtains, draperies, number shall be taken as being equal to 2 feet (610 mm).
fabrics and streamers; and all other materials utilized for dec- DESIGN PROFESSIONAL, REGISTERED. See “Regis-
orative effect including, but not limited to, bulletin boards, tered design professional.”
artwork, posters, photographs, batting, cloth, cotton, hay,
stalks, straw, vines, leaves, trees, moss and similar items, DESIGN PROFESSIONAL IN RESPONSIBLE
foam plastics and materials containing foam plastics. Decora- CHARGE, REGISTERED. See “Registered design profes-
tive materials do not include wall coverings, ceiling cover- sional in responsible charge.”
ings, floor coverings, ordinary window shades, interior finish [BS] DESIGN STRENGTH. The product of the nominal
and materials 0.025 inch (0.64 mm) or less in thickness strength and a resistance factor (or strength reduction factor).
applied directly to and adhering tightly to a substrate.
[BS] DESIGNATED SEISMIC SYSTEM. Those nonstruc-
[BS] DEEP FOUNDATION. A deep foundation is a founda- tural components that require design in accordance with
tion element that does not satisfy the definition of a shallow Chapter 13 of ASCE 7 and for which the component impor-
foundation. tance factor, Ip, is greater than 1 in accordance with Section
[BE] DEFEND-IN-PLACE. A method of emergency 13.1.3 of ASCE 7.
response that engages building components and trained staff
to provide occupant safety during an emergency. Emergency [F] DETACHED BUILDING. A separate single-story
building, without a basement or crawl space, used for the
response involves remaining in place, relocating within the storage or use of hazardous materials and located an
building, or both, without evacuating the building.
approved distance from all structures.
[A] DEFERRED SUBMITTAL. Those portions of the
design that are not submitted at the time of the application [BS] DETAILED PLAIN CONCRETE STRUCTURAL
WALL. See Section 1905.1.1.
and that are to be submitted to the building official within a
specified period. [BE] DETECTABLE WARNING. A standardized surface
[F] DEFLAGRATION. An exothermic reaction, such as the feature built in or applied to walking surfaces or other ele-
extremely rapid oxidation of a flammable dust or vapor in air, ments to warn visually impaired persons of hazards on a cir-
in which the reaction progresses through the unburned mate- culation path.
rial at a rate less than the velocity of sound. A deflagration [F] DETECTOR, HEAT. A fire detector that senses heat—
can have an explosive effect. either abnormally high temperature or rate of rise, or both.

20 2018 INTERNATIONAL BUILDING CODE ®
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