Ch 8 Timber Truss Roof Collapse Flashcards
(30 cards)
What is a timber truss? Pg 108
Timber is wooden construction larger than 2x4 inches, but not large enough to be classified as heavy timber or mill construction.
A timber truss can be built in a variety of shapes? Pg 108
•There is an inclined plane truss (gable shape roof).
•A parallel chord truss (flat roof).
•Bowstring truss (arch roof).
A burning church, synagogue, mosque, temple, or other house of worship is what type of construction? Pg 116
Interior is Type 3 and exterior is type 4
A defensive preplan firefighting strategy should be what? Pg 116
Consider collapse of the steeple, bell tower, the ceiling, and the timber truss roof, followed by side walls.
Where should the first aerial ladder be positioned at a church? Pg 119
Rose window which is a large stained glass window at the upper reaches of the front of the church or temple.
Where can a cut be made in the bowstring truss roof to determine if the fire has spread to the roof space?
p. 114
Sloping front of the roof
If the interior attack in a place of worship is successful, what is the next thing that firefighters should do? p. 122
Open up the walls
What is a sign to the firefighter that he/she may be working in a truss building? p. 110
Ability to stand and walk through the building
Which part of the tall window should be vented first? p. 120
Top
How many Valley Stream, New York firefighters were killed in a 1979 synagogue fire? p. 117
Two
What would create an explosion like eruption inside the church? p. 123
Large part of the ceiling collapsing
Which is the most common design of timber truss roof? p. 108
Bowstring
What is coating the timber truss roof in a place of worship that will cause it to burn rapidly and collapse? p. 117
Wax
What shape is incorporated into the wooden truss design? p. 108
Triangles
What does the split-ring metal connector remove the shear force from in the wooden truss? p. 108
Bolts
Who are generally the occupants of the bowstring truss building? p. 112
Employees only
Where should the secondary hoseline be directed when the first line is successful at controlling the fire at a
truss building with no ceiling? p. 113
Underside of the roof
What is the last priority in place of worship fire? p. 123
Property protection
What distance should the water stream be capable of reaching when attacking a fire directly in a truss building? p. 113
50 feet (15 m)
Which factor was common between the three buildings with truss roofs that collapsed in the timber truss trilogy of fires? p. 112
Truss roofs concealed by a ceiling
How long after the arrival of firefighters did the roof collapse at the Cliffside Park, New Jersey, Cardinal
bowling alley fire in 1967? p. 105
30 minutes
Which is NOT listed as one of the most dangerous areas during a fire at a place of worship? p. 123
Exposure C side
What can be removed to quickly vent the roof of a bowstring truss roof when the stability of the roof is assured? p. 114
Skylights
Which is the key to safety when operating at a fire in a truss constructed building? p. 116
Communications
