3.2 KiB
id, aliases, tags, title
| id | aliases | tags | title | |||||
|---|---|---|---|---|---|---|---|---|
|
IBC Construction Types |
IBC Construction Types
International Building Code (IBC) Section 602: Construction Classification lists 5 major construction types based on fire ratings/materials.
5-Over-1 Construction
"5-over-1" construction denotes a building with levels of combustible construction above levels of non-combustible construction.
buildings with two non-combustible levels (5-over-2) and Type III upper floors (3-over-1) are also common, though "5-over-1" denotes the general practice.
Type I: Fire Resistive Non-Combustible
Building elements are noncombustible1
- Concrete, masonry, noncombustible steel
Type I-A: Protected Fire-Resistive Non-Combustible
Common of pdi-building-types#High Rise and ibc-occupancy-classifications#Group I Institutional occupancies.
- 3hr Exterior Walls
- 3hr Structural Frame
- 2hr Floor/Ceiling Assembly
- 1.5hr Roof Protection
Type I-B: Unprotected Fire-Resistive Non-Combustible
Common of pdi-building-types#Mid Rise office and ibc-occupancy-classifications#Group R Residential occupancies.
- 2hr Exterior Walls
- 2hr Structural Frame
- 2hr Ceiling/Floor Separation
- 1hr Ceiling/Roof Assembly
Type II: Non-Combustible
Same materials as #Type I Fire-Resistive Non-Combustible, with reduced fire-resistance requirements.
Common of pdi-building-types#Mid Rise buildings.
Type II-A: Protected Non-Combustible
Common of pdi-building-types#High Density, including dormitory buildings.
- 1hr Exterior Walls
- 1hr Structural Frame
- 1hr Floor/Ceiling/Roof Protection
Type II-B: Unprotected Non-Combustible
Common of pdi-building-types#Commercial.
Type III: Combustible
Also known as "ordinary" construction.
Exterior walls are of noncombustible materials. Interior building elements may be combustible.
Type III-A: Protected Combustible
Common of pdi-building-types#High Density.
- 2hr Exterior Walls
- 1hr Structural Frame
- 1hr Floor/Ceiling/Roof Protection
Type III-B: Unprotected Combustible
Common of "warehouse" districts of older cities.
- 2hr Exterior Walls
Type IV: Heavy Timber
Also known as "mill" construction.
Exterior walls are of noncombustible materials. Interior building elements are of solid or laminated wooden members with a minimum nominal dimension of 8 inches without concealed spaces.
- 2hr Exterior Walls
- 1hr Structural Frame or Heavy Timber Heavy Timber Floor/Ceiling/Roof Assemblies
Type V: Wood Frame
Construction materials are of any allowed by code, combustible or noncombustible.
Common of pdi-building-types#Garden Style or above podiums
Type V-A: Protected Wood Frame
Commonly used in the construction of newer apartment buildings. There is no exposed wood visible.
- 1hr Exterior Walls
- 1hr Structural Frame 1hr Floor/Ceiling/Roof
Type V-B: Unprotected Wood Frame
Common of single family homes.
-
Defined as passing the test procedures for defining combustibility of elementary materials set forth in ASTM E 136 ↩︎