World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0004872994
Reproduction Date:

Title: Occupancy  
Author: World Heritage Encyclopedia
Language: English
Subject: Area of refuge, Fire protection, New Hampshire House of Representatives, List of the oldest buildings in the world, Occupancy cost
Collection: Fire Protection
Publisher: World Heritage Encyclopedia


Within the context of building construction and building codes, "occupancy" refers to the use, or intended use, of a building, or portion of a building, for the shelter or support of persons, animals or property.[1] A closely related meaning is the number of units in such a building that are rented, leased, or otherwise in use. Lack of occupancy, in this sense, is a vacancy.


  • Building codes 1
  • Building utilization 2
  • Other meanings 3
  • See also 4
  • References 5

Building codes

It is possible to have multiple occupancies (or building uses) within one building. For example, a high-rise building can have retail stores occupying the lower levels, while the upper levels are residential. Different occupancies within a building are separated by a fire barrier[2] with a defined fire-resistance rating. It is common for a penetration (such as a fire door) to have a fire protection rating lower than the wall fire–resistance rating in which it is installed.[3] For example, a two-hour fire separation normally requires fire doors rated at 90 minutes.

For some high challenge occupancies,[4] the code requirements for an occupancy separation are more stringent than for other fire barriers, even with an identical fire resistance rating. In this case, an occupancy separation with a two-hour fire-resistance rating may not be able to "de-rate" its closures, such fire doors and firestops. For example, a two-hour rated "high challenge fire wall"[5] requires two-hour rated fire doors.

Firestops in occupancy separations are also more likely to require an equal fire protection rating (a fire resistance rating for closures). They also must provide a temperature rating ensuring that the components of the firestop systems, including the penetrants are not permitted to rise in temperature above 140°C (284°F) on average or 180°C (356°F) at any single point, to lower the likelihood of auto-ignition on the unexposed side. In this manner, occupancy separations are treated similarly to fire walls which are structurally stable in case of a fire, thus limiting the danger of fire-induced building collapse.

In this sense, there are two occupancies in many single-family homes: the garage and the living space of the home. Because automobile gasoline is flammable, an occupancy separation is often required between the two should there be a vehicle fire. Water heaters and central heating are often placed in this space as well for their use of natural gas, propane, or other fossil fuels in combustion. This also helps to prevent carbon monoxide poisoning.

Building utilization

The interior of a vacant building showing signs of vandalism and decay

Occupancy can also refer to the number of units in use, such as hotel rooms, apartment flats, or offices. When a motel is at full occupancy, it is common practice to turn on a NO VACANCY neon sign. Completely vacant buildings can also attract crime.

Occupancy can also refer to the number of persons using an undivided space, such as a meeting room, ballroom, auditorium, or stadium. As with building codes, fire protection authorities often set a limit on the number of people that can occupy a space at one time. These limits are established primarily to allow all occupants safe passage through exits, but can also be employed to preserve the integrity of a structure.

An occupancy sensor is a device that can tell if someone is in a room, and is often used in home automation and security systems. These are typically more advanced than motion sensors, which can only detect motion.

Other meanings

In transport engineering, occupancy can refer to:

  1. The number of passengers occupying a vehicle
  2. The percentage of time in which a detector is occupied by a vehicle
  3. The average number of particles occupying a state

In association football, occupancy can refer to:

  1. A team that does not currently have a manager, a president, or a home stadium

See also


  1. ^
  2. ^ NFPA 5000 Building Construction and Safety Code 2006 Edition, Chapter 6 Classification of Occupancy, Classification of Hazard of Contents, and Special Operations section 6.2.4
  3. ^ NFPA 5000 Building Construction and Safety Code 2006 Edition, Chapter 8 Fire-Resistive Materials and Construction, Table 8.7.2 Minimum Fire Protection Ratings for Opening Protectives in Fire Resistance–Rated Assemblies
  4. ^ NFPA 5000 Building Construction and Safety Code 2006 Edition / Chapter 8 Fire-Resistive Materials and Construction, Table 8.7.2 Minimum Fire Protection Ratings for Opening Protectives in Fire Resistance–Rated Assemblies
  5. ^ NFPA 5000 Building Construction and Safety Code 2006 Edition, section 8.3
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.