Ch 9 Flat Roof Collapse Flashcards
What is a common type of roof found in ordinary constructed buildings? Pg 130
A tar and wooden roof deck attached directly to joists spaces 16 inches on center.
Which type of construction uses steel bar joints for roof and floor construction? Pg 133
Type 2
When a fire building has a steel bar joints system supporting the roof what should you do? Pg 133
Horizontal ventilation of windows and doors, in advance of hoselines, is preferred to vertical ventilation.
Lightweight wood truss is another dangerous roof construction that can fail within how many minutes of fire exposure? Pg 133
5 to 10 minutes
What is another deadly type of lightweight construction? Pg 133
The Wood I-beam
What is the most common flat roof supporting member used in older ordinary constructed buildings? Pg 133
The conventional solid wooden joist
What is a restrained beam? Pg 134
Is restrained at both ends
What is an unrestrained beam? Pg 134
Has the ends resting on a girder or brick corbel shelf, not rigidly held in position.
What is a brick cavity construction? Pg 134
The solid wood beams are placed within a recessed portion of a brick wall and cemented into position.
What is a corbel shelf construction? Pg 135
The wood joist are not rigidly encased in a brick wall, but are simply resting on a girder or a brick shelf.
Where along the parapet wall is there a shaft that separates the buildings?
p. 139
Rear half of the building
After what amount of fire exposure can unprotected steel bar joist construction fail? p. 130
5 to 10 minutes
What can cause the raised roof to seem about to collapse? p. 137
Fire weakened roof space created by the built-up framework
How should the disoriented firefighter move along the rooftop? p. 139
Crawling slowly
Which of the following could cause the firefighter to lose balance while cutting on an inverted roof? p. 137
Collapse of smaller framework
Which of the following serves as a fire cut beam? p. 135
Corbel shelf construction
What is the last line of defense for the firefighter who is trapped in a fiery environment? p. 140
Protective gear
What is often used to cover an old skylight? p. 139
Thin sheet of plywood
What must firefighters do at the first sign of any type of truss construction?
p. 132
Notify the officer in command
What should the firefighter do when a newly repaired roof section is encountered? p. 139
Avoid the area
What will injuries from a fall through a roof be secondary to? p. 129
Burns
What type of supporting system will generally give some warning before failing? p. 133
Wood joist
Which type of ventilation is preferred when a fire building has a steel bar joist system supporting the roof?
p. 133
Horizontal
What type of beam is in brick cavity construction? p. 134
Restrained
Where would the firefighter fall if the roof deck is weakened on an inverted roof? p. 137-138
Roof deck
Where will the roof be the strongest with brick cavity construction? p. 134
Near the edges
Which of the following is NOT a fact that must be known to determine the risks of a flat roof collapse? p. 131
What type of roofing material was used in the construction?
How will the unrestrained beam move when the roof beam burns away in the center? p. 135
Rotate off the supports and slant downward toward the
center of the collapse area
What are steel bar joists? p. 132
Metal trusses
Which type of construction uses steel bar joists for roof and floor construction? p. 133
Type II
What should the disoriented firefighter do when roof evacuation is urgent? p. 140
Crouch down and move ahead slowly
What should the firefighter do when straddling a party wall when the roof cannot be seen due to smoke? p. 139
Drop a tool and listen for it to hit the roof
