Chapter 9

Question 1

Solid wood joist roof construction correct

a. The roof deck will soften before joist failure occurs
b. They do not collapse suddenly
c. They withstand high temperatures for long periods of time before they fail
d. They generally give warning before they collapse

Answer 1

A-D
They do not collapse suddenly, They generally give warning before they collapse, The roof deck will soften before joist failure occurs, They withstand high temperatures for long periods of time before they fail

Question 2

Most H-type apartments have what kind of beams?

a. Unrestrained beams—corbel shelf, which are less stable under fire conditions
b. Restrained beams—brick cavity, which are more stable under fire conditions

Answer 2

A

Question 3

FF is evacuating a roof incorrect?

a. If roof evacuation is urgent, a FF should crouch down, move ahead slowly, and use a tool or outstretched leg to feel for the presence of a roof deck and its stability
b. A FF momentarily blinded by smoke or darkness and in no immediate danger, may be best to remain in place until the wind changes and the smoke clears
c. A disoriented FF should not walk upright
d. If ordered to evacuate a roof, a FF should take the shortest path.

Answer 3

D If ordered to evacuate a roof, a FF should take the safest

Question 4

Regarding Solid wood joist roof incorrect
A. Roof deck will soften first and serve as a warning of an impending serious joist failure
B. Brick cavity (restrained) roof beams support more weight near their encased ends than in their unsupported centers. Thus, walking close to parapet wall may provide support on fire weakened roof
C. Unrestrained roof beams (corbel shelf or fire cut beams) are less stable under fire conditions than brick cavity beams
D. Most H-type apts have roof joists that are restrained

Answer 4

D Unrestrained to preserve masonry. This weakens floor boards