ICC BCS flashcards

33 cards. Read the term and the definition here. The deck at the top of this page is optional.

Occupancy classification purpose

Assigning a use to an occupancy group establishes the baseline requirements for egress, fire separation, sprinkler thresholds, and allowable height and area.

Type of construction

A classification from I to V, with protected and unprotected subtypes, that limits building height and area based on combustibility and fire-resistance of structural elements.

Allowable area calculation

Tabular base area is adjusted by a frontage increase for open perimeter and a sprinkler increase, producing the maximum permitted floor area per story.

Height in stories vs feet

Both limits apply independently; a building must satisfy the story limit and the feet limit, and exceeding either one requires a different construction type or compliance alternative.

Means of egress components

The continuous path consists of exit access, the exit itself, and exit discharge, each governed by separate width, enclosure, and travel-distance provisions.

Fire-resistance rating

A time in hours that an assembly resists fire exposure under standardized testing, used to size fire barriers, fire walls, and opening protectives.

Occupant load factor

A floor area allowance per occupant assigned by use; dividing the floor area by this factor yields the occupant load used for egress sizing.

Egress capacity

Required width equals occupant load multiplied by the capacity factor for each egress component, with stairways and level components having different factors.

Travel distance

The measured length along the natural path from the most remote point to an exit, capped by occupancy-specific limits and often increased where sprinklers are provided.

Common path of travel

The distance a occupant must travel before reaching a point with two distinct routes, limited separately from total travel distance.

Dead-end corridor limit

A maximum corridor length with only one direction of escape, set by occupancy and sprinkler status to prevent occupants from being trapped.

Remoteness of exits

Where two exits are required, they must be separated so a single fire cannot block both, commonly by at least half the diagonal of the floor area.

Mixed occupancy options

Designers may apply the most restrictive provisions to the entire building or separate occupancies with rated fire barriers and evaluate each independently.

Incidental use areas

Small rooms such as mechanical or storage spaces that must be separated from the main occupancy by rated construction when they exceed listed size thresholds.

Opening protective rating

Doors and windows in rated walls require fire protection assemblies rated in proportion to the wall, often with a maximum rating cap for the opening.

Fire wall vs fire barrier

A fire wall divides a building into separate buildings for area purposes and must be structurally stable; a fire barrier separates spaces within one building.

Sprinkler trade-offs

Automatic sprinkler systems commonly permit increases in allowable area and travel distance and reductions in required fire separation and exit remoteness.

Accessible route continuity

An accessible path must connect site arrival points, entrances, and all accessible spaces without steps, using ramps or elevators where grade changes occur.

Clear width at doors

Door clear width is measured with the door open at ninety degrees, and the required dimension depends on occupant load and accessibility criteria.

Alteration compliance methods

The work area method scales upgrades to the portion altered, while the prescriptive method applies fixed improvements regardless of project scope.

Change of occupancy review

Moving to a more hazardous occupancy classification can trigger new fire separations, egress capacity, and sprinkler requirements even without new construction.

Certificate of occupancy

Issued after required inspections pass, it documents the approved use and occupant load and is required before a building may be legally occupied.

Referenced standards role

Adopted codes incorporate standards such as ASTM test methods and ASCE load criteria; those standards carry the force of code once referenced.

Most restrictive provision rule

Where code documents conflict, the requirement producing the greater level of safety or the more restrictive outcome is the one that governs design.

Exit enclosure rating

Interior exit stairways and ramps require fire-resistance-rated enclosures, with the rating set by building height and occupancy.

Exit discharge requirement

The path from the exit terminal to a public way must remain protected or be separated from the building, with limits on distance traveled outside.

Number of exits threshold

The required number of exits increases with occupant load, and each additional exit adds capacity and redundancy to the egress system.

Horizontal exit

A rated wall with openings protected so occupants can pass to an adjacent area of refuge, counting as an exit for egress capacity.

Areas of refuge

Designated spaces where occupants unable to use stairs can wait for assistance, required where accessible egress depends on elevators or protected areas.

Guard and handrail height

Guards protect open-sided walking surfaces above grade, and handrails along stairs and ramps must fall within specified height ranges for graspability.

Stairway dimensional limits

Riser height, tread depth, headroom, and landing dimensions are prescribed so that stairways maintain consistent and safe stepping geometry.

Permit application content

Submittal documents must show occupancy, construction type, and egress design sufficient for the official to determine code compliance before work begins.

Inspector authority limits

The building official may interpret code provisions and require corrected work, but approval does not waive the owner's duty to comply fully.