Chapter 8 - Wood-frame Construction Flashcards
Lumber that is 8 in or more in its smallest dimension.
Heavy timber. (205)
What type of walls do post and frame buildings have?
Not structural or load-bearing. (206)
In what type of building do the studs run two or more stories high from the foundation to the eve line?
Balloon frame. (207)
Who are often the culprits for starting fires in the walls of balloon frame buildings?
Plumbers. (208)
Where is the worst place for a fire to start in a balloon frame building
The basement.
What is the one common vertical means of fire spread in balloon frame and platform frame buildings?
The open stairwell.
What construction feature converts a platform frame into a balloon frame building
A soffit.
What type of construction has the positive benefit of reducing the volume of concealed space in which fire can burn
Plank and beam
What are trusses most often used as?
Beams.
Gusset plates contain a series of small teeth what size
3/8”
During a fire the presence of truss floors may be disclosed how
Smoke or Fire pushing through the wall at the floor line
Exterior sheathing plays a critical role in whether this effect is visible
Any exposure in which the product of concentration is _____ is likely to be dangerous
33,000
A 10 minute exposure to how much CO WOULD BE HAZARDOUS AND POSSIBLY INCAPACITATING
3500 ppm
How much PPM can be fatal after a few breaths
12,500
What is the flammability range of CO
12.5 to 74 percent.
What is the ignition temperature of CO
1128° F
What two areas in lightweight wood frame structures are not protected by sprinklers
Unoccupied attics
Floor void spaces
What three spaces are not protected by sprinkler systems
Bathrooms under 55 ft square
Closets under 24 ft square
Balconies
Wooden I-beams have shown failure and how many minutes
6 minutes
What can be considered the most dangerous of all structural members to firefighters? (2)
Wooden I-joists
Lightweight wood trusses
What are considered truly disposable buildings
Truss frame
What is the major problem of combustible construction
Fire spread through hidden voids.
Firestops typically limit what type of movement
Vertical movement through relatively small concealed passages.
Draft stops limit what type of movement
Horizontal movement through large concealed passages.
What are the two types of firestopping
Inherent and legal
In wood platform frame structures what provides inherent firestopping
Sole plate.
What is the recommended location for firestopping in multiple unit dwellings?
Along the tenant separations.
Wood cannot be made what?
Fireproof or non-combustible
What stress is plywood resistant to
Shear
What readily extends fire vertically?
All combustible siding.
What type of shingles explode when heated
Asbestos
What type of siding has no fire resistance value
Asphalt felt siding.
In a bearing wall headers can be seen on which row
7th
What hazard should be the dominant consideration with regards to wood shingles
Conflagration
In newer construction which is stronger the floor or the roof?
The floor.
OSB loses its structural strength and fails when it becomes saturated with what
Water
What is an indicator of a balloon frame home
Tall narrow windows
If a fire starts in the basement you need to quickly check where
The attic
What is the safest and most effective way to attack a fire in a balloon frame structure
Removing the exterior siding
In a wall fire the attic is considered what
An extension of the wall
If a fire is large enough to require a blitz attack what is the rescue profile percentage
0
What is the major problem with combustible construction
Fire spread through hidden voids
