Ch 13 Stairway Collapse Flashcards
There are three basic stair types? Pg 182
•A straight run stair: often constructed of wood or concrete.
•A U-return stair: most often constructed with a steel frame, is the type of stair preferred in modern building construction.
•An L shaped stair: is most often constructed of wood and found in private homes.
Which type of landing collapse is most dangerous to firefighters? Pg 185
Intermediate landing collapse
Which type of stair breaks up the stair climb at the middle of the stair rise with an intermediate landing
where the climber reverses direction?
p. 183
U-return
Which will prevent the landings of the U-return stair from collapsing? p. 185
Reinforcing pan
Which type of stair provides a 45- or 60-degree angle with an uninterrupted passage between two floors? p. 182
Straight-run
Which is the most frequent cause of collapse of a U-returnstair? pg 185
Failure of stone stair tread
What can be used to span the stair rise if an interior stair appears in danger of collapse? p. 186
Ladder
Which type of stairs when found in masonry enclosures are independent of the floor structure and will not collapse during floor failure? p. 184
U-return
What material is most often used to construct the straight-run stair? p. 182
Wood
What are the wood beams holding up the stairway? p. 184
Carriage beam supports
Which part of the steel U-return stair poses the collapse danger? p. 184
Intermediate landing collapse
Where is the L-shaped stair most often found? p. 183
Private homes
In what configuration should firefighters work from an interior stair? p. 186
Hoseline at the top with feeder at the bottom
What material is usually used on the soffit under stairs to slow the fire spread? p. 182
Wire lath and plaster
In which direction is the firefighter moving when intermediate landings made of stone or marble on steel-framed U-return stairs most often collapse? p. 187
Down
