International Building Code (IBC)
Building codes are regulations that set out the standards to which buildings and other structures must conform. The International Building Code (IBC) is one of the codes established in the US by the International Code Council (ICC) and is applied by most of the country’s jurisdictions as well as internationally, although it can be amended to reflect local conditions and legislation.
IBC can be applied to most types of new buildings and is intended to ensure efficient and flexible building designs that protect health and safety and encourage the use of technological advances.
It requires that buildings and structures are classified under two categories:
- Use and occupancy.
- Type of construction.
Under use and occupancy there are several groups and subgroups that define a building’s specific use and are numbered based on the perceived risk the building poses to its occupants (the lower the number, the higher the risk). They are defined as follows:
| OCCUPANCY GROUP | SUBGROUPS | USES |
| Assembly |
A-1 (theatres, halls for performing arts) A-2 (restaurants) A-3 (worship and other recreation) A-4 (indoor arena) A-5 (stadiums) |
Places used for people gathering. |
| Business | B | Places used for providing services (e.g. banks, government buildings, police stations, offices). |
| Educational | E | Schools and day care centres. |
| Factory | F1 and F2 | Places used for manufacturing, packaging, repairing, etc. |
| High Hazard | H-1, H-2, H-3, H-4, and H-5 | Places involving hazardous materials (production, storage, etc.). |
| Institutional | I-1, I-2, I-3, and I-4 | Places where people are unable to leave without assistance (e.g. hospitals, care homes, prisons), |
| Mercantile | M | Commercial (e.g. shops, department stores, etc.). |
| Residential | R-1, R-2, R-3, and R-4 | Places providing overnight accommodation (e.g. houses, hotels, apartments, hostels, etc.). |
| Storage | S-1 and S-2 | Places where things are stored (e.g. warehouses, car parks, garages, etc.). |
| Utility and miscellaneous | U | Accessory structures and others (e.g. towers, barns, cooling towers, stables, tanks, retaining walls, etc.). |
Buildings can also be classified as a mixed occupancy type if they are occupied by more than one group type, and the different parts must conform to the codes for those areas. For example, a shopping centre with an underground car park will need to conform to both Group M and Group S.
The type of construction identifies the type of materials utilised for constructing the building or structure and classifies the level of combustibility and fire resistance associated with its elements (including primary structural frame, exterior and interior load-bearing and non-load-bearing walls, floor and roof). These are categorised as follows:
- Types I and II: Building elements are made of noncombustible materials.
- Type III: Exterior walls are made of noncombustible materials, the interior elements are made of any permissible material.
- Type IV: Exterior walls are made of noncombustible materials, interior elements are made of, or incorporate, timber.
- Type V: Structural elements comprise any permissible materials (A: Fire-resistance rated construction. B: Non fire-resistance rated construction).
[edit] Related articles on Designing Buildings Wiki
- Building codes.
- Building inspector.
- Building official.
- Building regulations.
- Code of practice.
- Design review.
- Certificate of occupancy.
- International Code Council ICC.
- International Existing Building Code (IEBC).
- International Residential Code (IRC).
- International Zoning Code (IZC).
- Licensed contractors in the USA.
- Performance specification.
- Planning permission.
- Office of Construction Services.
- Structural engineering codes.
- The role of codes, standards and approvals in delivering fire safety.
- What approvals are needed before construction begins.
- Zoning in the United States.
Featured articles and news
From medieval scribes to modern word art.
Electrical contractors welcome crackdown on late payment and push for clean energy.
Cyber Security in the Built Environment
Protecting projects, data, and digital assets: A CIOB Academy TIS.
Managing competence in the built environment
ITFG publishes new industry guide on how to meet the ICC principles.
The UK's campaign to reduce noise pollution: Mythbusting, articles and topic guides.
Setting Expectations on Competence Management
Industry Competence Committee.
New Scottish and Welsh governments
CIOB stresses importance of construction after new parliament elections.
The sad story of Derby Hippodrome
An historic building left to decay.
ECA, JIB and JTL back Fabian Society call to invest in skills for a stronger built environment workforce.
Women's Contributions to the Built Environment.
Calls for the delayed Circular Economy Strategy
Over 50 leading businesses, trade associations and professional bodies, including CIAT, and UKGBC sign open letter.
The future workforce: culture change and skill
Under the spotlight at UK Construction Week London.
A landmark moment for postmodern heritage.