PDX_33_Fire 2 Flashcards
Building types:
Building elements are of noncombustible materials.
Type 2
Type 2A = 1 hour min. fire rating
Type 2B = no fire rating
Building types:
Building elements are of noncombustible materials
Type 1
Type 1A = 3 hour fire rating
Type 1B = 2 hour fire rating
Building types:
Exterior walls are of noncombustible materials, interior elements are of any material allowed by code
Type III
3A = 1 hour minimum rating with 2 hr exterior bearing walls
Type 3B = unrated interior w/ rated 2 hr exterior bearing walls
Building types:
Heavy timber. Exterior walls are of noncombustible materials, interior elements are of solid or limited would without concealed spaces
Type 4
Building types:
Structural elements, exterior, and interior walls are of any materials allowed by code.
Type 5
Type 5A = 1 hour exterior bearing walls
Type 5B = no fire rating
Building types:
Protected/fire resistance rated construction:
All members have additional fire rated coding/cover such as she rock, or spray on fireproofing. Extends the fire resistance rating of structure members by at least an hour.
Group a
Building types:
Unprotected/non-fire resistance rated construction: All structural members have no added coding/cover. Exposed members are only fire resistant according to their natural ability or characteristic.
Group B
Type with highest fire resistance rating, and type with lowest:
Type 1A has highest,
Type 5B has lowest
If the building is protected throughout with an approved sprinkler system that IBC allows the tabulated area of a single-story building to be:
And of multi story buildings to be:
Quadrupled.
Tripled at multistory.
If more than___of a building perimeter walls face public way/open space, and increase in area is granted her a formula
1/4 faces open space
If a building is divided by firewalls and to me it’s required fire resistance rating’s, each portion of the building that is separated from the remainder of the building by firewalls can be considered:
Separate building, for purposes of calculating allowable area.
Basically at a building can be a lot bigger than the IBC table would normally allow.
Comprised of three parts:
Exit access
Exit
Exit discharge
Building egress
The portion of a means of egress system that leads from any occupied portion of the building to an exit:
Exit access
The portion of the means of egress system that is separated from other occupied spaces by fire rated construction, and extends between the exit access and exit discharge:
Exit
The portion of the means of egress system between the exit and a public right-of-way.
Exit Discharge
Are no longer permitted or usually permitted because smoke rising from lower floors eliminates the safety of using them
Exterior fire escapes
A path of egress travel from one part of the building to another part of the building on the same level, which for safety from fire and smoke
Horizontal exits
Similar to an exit, but horizontal, and leads to the exit discharge
Exit passageway
Egress is regulated by:
Number of occupants,
Function of space
Aisles, stairs, and doors are sized by multiplying the occupant load by :
The Egress Widths per Occupant Table per the IBC
The minimum exit with in inches is determined by multiplying the total flow in the passage (total occupant load) by:
- 2 in sprinkler buildings
- 3 in non-sprinklers.
Can’t be less than 44 inches.
Generally at least two means of egress are required unless:
There are more than 500 occupants,
Then more required.
Also number of exits may be influenced by travel distance, or length of the common path of travel to an exit.
For typical commercial uses, the threshold for needing more than one exit is:
50 Occupants
When two or more exits are required they must be separated by:
1/2 the diagonal dimension of the building
Or 1/3 for sprinkler buildings
Fire ratings for corders are regulated by the IBC. Typically commercial buildings with a sprinkler system:
Don’t require a corridor rating
Residential buildings require a corridor fire rating of:
30 minute corridor rating
