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Fire Resistance Rating
How long a material can resist typical fire as measured on a time-temperature curve.
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Fire Stop
Solid material used to prevent or limit vertical and horizontal spread of fire and products of combustion.
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Fire Resistance Directory
List of buildings tested and given a fire rating.
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Non-combustible Materials
Not capable of supporting combustion under normal circumstances.
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Type I construction
Fire-resistive.
Protected steel frame construction
Reinforced concrete and pre cast concrete
Steel beams covered with spray on fireproofing or fully encased in underwriters lab designed system.
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Type II construction
Non-combustible or protected non-combustible.
Materials will not contribute to fire spread or growth
May have combustibles on exterior (balconies, wall coverings)
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Type III construction
Exterior protected (masonry)
Churches, schools, apartment dwellings, mercantile shops.
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Type IV construction
Heavy Timber
Lumber great than 4" in diameter
Perminant partitions and structural members must have minimum 1-hour rating.
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Type V construction
Wood Frame.
Materials dimensions must be smaller than type IV construction.
Most residential homes.
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Masonry
Bricks, blocks, stones, and unreinforced and reinforeced concrete products.
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NFPA 220 Three digit classification
- Digit one-
- Fire rating in hours for exterior walls
- Digit two-
- Fire rating in hours for structural frames or columns that support loads of more than one floor.
- Digit three-
- Fire rating in hours for floor condtruction.
EXAMPLE: Type I classification 4-4-3 or 3-3-2
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Fire/Fuel Load
Potential heat release of a fire within a compartment.
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International Building Code Classifications
- Group A- Assembly
- Group B- Business
- Group E- Education
- Group F- Factories
- Group H- High Hazard
- Group I- Institutional
- Group M- Mercantile
- Group R- Residential
- Group S- Storage
- Group U- Utility and Miscelaneous
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Group R
- R1- Hotels and motels
- R2- Apartments, dorms
- R3-Permanent Occupancies not more than two dwelling units
- R4-Assisted living facilities 5-16 occupants
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Group A
- A1-Fixed seating theatre
- A2-Nightclubs, restaurants
- A3-Bowling alleys, Churches, exhibition halls
- A4- Sports arenas
- A5- Outdooe arenas, Grand stands
- Class A 1,000 people or more
- Class B 301-1,000 persons
- Class C 50- 300 persons
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Group F
- F-1 Moderate Hazard (aircraft, furniture, metals, millwork)
- F-2 Low Hazard (brick, masonry, glass products and gypsum)
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Group H
- H-1 Detonation hazard
- H-2 Deflagration hazard
- H-3 Materials readily support combustion or pose physical hazard
- H-4 Health hazard
- H-5 Hazardous production
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Group I
- I-1 Assisted living holding more than 16 persons on 24-hour basis. (capable of self rescue)
- I-2 Medical, surgical , psychiatric, or nursing care more than 5 people not capable of self rescue or need assistance
- I-3 Prisons, detention facilities more than 5 people under restraint.
- I-4 Child and adult care facilities
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Group R
- R-1 Sleeping units containing mostly transients (boarding houses, hotel, motels)
- R-2 More than two dwelling units with permant residency (apartment, non transient hotel)
- R-3 Permant occupancy and not classifie in R1,R2, R$ or I
- R-4 Residential/assisted living facilities with more than 5 but less than 16 occupants.
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Group S
- S-1 Moderate Hazard Storage (books, bags, linoleum, lumber)
- S-2 Low Hazard Storage (asbestos, bagged cemetn, electric motors, glass and metal parts.)
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