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Collapse of Burning Building > Ch 9 Flat Roof Collapse > Flashcards

Ch 9 Flat Roof Collapse Flashcards

1
Q

What is a common type of roof found in ordinary constructed buildings? Pg 130

A

A tar and wooden roof deck attached directly to joists spaces 16 inches on center.

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2
Q

Which type of construction uses steel bar joints for roof and floor construction? Pg 133

A

Type 2

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3
Q

When a fire building has a steel bar joints system supporting the roof what should you do? Pg 133

A

Horizontal ventilation of windows and doors, in advance of hoselines, is preferred to vertical ventilation.

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4
Q

Lightweight wood truss is another dangerous roof construction that can fail within how many minutes of fire exposure? Pg 133

A

5 to 10 minutes

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5
Q

What is another deadly type of lightweight construction? Pg 133

A

The Wood I-beam

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6
Q

What is the most common flat roof supporting member used in older ordinary constructed buildings? Pg 133

A

The conventional solid wooden joist

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7
Q

What is a restrained beam? Pg 134

A

Is restrained at both ends

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8
Q

What is an unrestrained beam? Pg 134

A

Has the ends resting on a girder or brick corbel shelf, not rigidly held in position.

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9
Q

What is a brick cavity construction? Pg 134

A

The solid wood beams are placed within a recessed portion of a brick wall and cemented into position.

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10
Q

What is a corbel shelf construction? Pg 135

A

The wood joist are not rigidly encased in a brick wall, but are simply resting on a girder or a brick shelf.

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11
Q

Where along the parapet wall is there a shaft that separates the buildings?
p. 139

A

Rear half of the building

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12
Q

After what amount of fire exposure can unprotected steel bar joist construction fail? p. 130

A

5 to 10 minutes

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13
Q

What can cause the raised roof to seem about to collapse? p. 137

A

Fire weakened roof space created by the built-up framework

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14
Q

How should the disoriented firefighter move along the rooftop? p. 139

A

Crawling slowly

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15
Q

Which of the following could cause the firefighter to lose balance while cutting on an inverted roof? p. 137

A

Collapse of smaller framework

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16
Q

Which of the following serves as a fire cut beam? p. 135

A

Corbel shelf construction

17
Q

What is the last line of defense for the firefighter who is trapped in a fiery environment? p. 140

A

Protective gear

18
Q

What is often used to cover an old skylight? p. 139

A

Thin sheet of plywood

19
Q

What must firefighters do at the first sign of any type of truss construction?
p. 132

A

Notify the officer in command

20
Q

What should the firefighter do when a newly repaired roof section is encountered? p. 139

A

Avoid the area

21
Q

What will injuries from a fall through a roof be secondary to? p. 129

A

Burns

22
Q

What type of supporting system will generally give some warning before failing? p. 133

A

Wood joist

23
Q

Which type of ventilation is preferred when a fire building has a steel bar joist system supporting the roof?
p. 133

A

Horizontal

24
Q

What type of beam is in brick cavity construction? p. 134

A

Restrained

25
Q

Where would the firefighter fall if the roof deck is weakened on an inverted roof? p. 137-138

A

Roof deck

26
Q

Where will the roof be the strongest with brick cavity construction? p. 134

A

Near the edges

27
Q

Which of the following is NOT a fact that must be known to determine the risks of a flat roof collapse? p. 131

A

What type of roofing material was used in the construction?

28
Q

How will the unrestrained beam move when the roof beam burns away in the center? p. 135

A

Rotate off the supports and slant downward toward the
center of the collapse area

29
Q

What are steel bar joists? p. 132

A

Metal trusses

30
Q

Which type of construction uses steel bar joists for roof and floor construction? p. 133

A

Type II

31
Q

What should the disoriented firefighter do when roof evacuation is urgent? p. 140

A

Crouch down and move ahead slowly

32
Q

What should the firefighter do when straddling a party wall when the roof cannot be seen due to smoke? p. 139

A

Drop a tool and listen for it to hit the roof

Collapse of Burning Building (24 decks)

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