Deck 95

Question 1

there are three ways a masonry exterior building wall can collapse.1- wall may fall straight out at 90 degree angle2- wall may crumble stright down in a so-called curtain fall3- wall may collapse in a inward-outward fashion, with top falling inward and bottom the bottom falling outward.? of the three above which is most common type of masonary wall failure at fires?

Answer 1

90 degree angle collapse-walls will fall stright out and the top of the collapsing wall strikes the ground, a distance equal to the height of the falling section measured from the base of the wall .- bricks and steel lintels may bounce or roll out even further.page 23 GS

Question 2

T/f?can an inward/outward collapse by a masonary wall failure be caused by collapse of a bowstring timber roof.

Answer 2

true page 24when planning for a bowstring timber truss collapse, firefighters should also consider a front and rear wall collapse.

Question 3

the collapse zone as a general rule is a distance equal to height of the wall . this may be increased to 1 1/2 or twice the height of the wall if have the following . more than one correct.A- a truss roof triggers the wall collapseB- an explosion triggers the wall collapseC- If ordered by the IC

Answer 3

all truepage 25

Question 4

If the collapse danger zone is greater then the reach of the hose stream what must be done .only one Incorrect.A- FFs should be kept away from the front wall altogetherB- position heavy caliber streams in a flanking position-on either side of the front wall, beyond the outter perimeter of the buildings width.C- if must operate a master stream inside collapse zone, and wall appears unsafe, the portable deluge nozzle or aerial stream should be used with minimal FF for safety.

Answer 4

C IC portable deluge or aerial stream should be secured to direct the stream effectively and safely and then left unattended.page 25

Question 5

true/falseCanopy collapse is more dangerous then a marquee?

Answer 5

true page 26 GSmost dangerous canopy is a metal(corrugated tin) or wood shed suspended over a truck loading area, covered with tarpaper, thus extermely combustible.