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