ch8 vertical ventilation

Question 1

chains saws used for forcible entry or ventilation are usually equipped with blank chains to allow cutting through nails and light-gauge metal components

Answer 1

carbide tipped

Question 2

if on scene resources permit, a burning building should be laddered?

Answer 2

on all sides

Question 3

to observe certain constructions features and other signs that can warn firefighters of potentially unsafe conditions

Answer 3

read a roof

Question 4

in general the strongest points of any roofs are?

Answer 4

directly over roof supports, at ridges or valleys, and where the roof meets the outside walls

Question 5

whenever there is any doubt about the structural integrity of a roof, vertical ventilation operations must be limited to?

Answer 5

those that can be done from an aerial device or other position of safety

Question 6

blank are normally square or rectangular metal-covered hatches that provide an exit from an attic or cockloft onto the roof and are often accessed from the top floor or the attic by a ladder

Answer 6

scuttle hatches

Question 7

These structures often enclose the tops of stairways that terminate on the roof and they usually have a metal-clad door of standard size

Answer 7

penthouses(bulkheads)

Question 8

some blank are thermoplastic units that are designed to melt out from the heat of a fire and thereby ventilate the building

Answer 8

skylights

Question 9

blank vents are square or rectangular structures that penetrate the roofs of single-story or multistory buildings to provide additional natural light and/or ventilation

Answer 9

monitors

Question 10

narrow, plastic attic vents that run the entire length of the ridge

Answer 10

ridge vents

Question 11

the most common pitch in pitched roofs

Answer 11

5 in 12

Question 12

in blank construction, the ceiling is often omitted and the rafters become part of the interior decor

Answer 12

post-and-beam

Question 13

it’s A-frame configuration consists of rafters that run perpendicular to the ridge beam and down to and usually beyond the outside walls

Answer 13

Gable Roof

Question 14

blank roof construction consists of a ridge beam with conventional rafters running perpendicular to the ridge and hipr rafters running from the ends of the ridge beam, at a compound angle of 45 degrees laterally, and some lesser vertical angle down to and beyond the outside walls at the corners

Answer 14

hip

Question 15

this roof slopes down to meet every outside wall

Answer 15

hip roof

Question 16

The blank roof consists of a high gabled roof with a vertical wall above a downward pitched shed roof section on either side

Answer 16

lantern roof

Question 17

the blank roof can be seen as half of a standard gable roof or as a slightly pitched flat roof sloped from only one side-usually from the front of the building down to the back

Answer 17

shed

Question 18

Shed style roofs may be constructed with blank which are more prone to early collapse

Answer 18

mono-pitch trusses

Question 19

blank are heavy-duty trusses with sloping ends

Answer 19

bridge trusses

Question 20

the blank roof has a double slope on each of its four sides

Answer 20

mansard roof

Question 21

four steeply sloped sides rise to meet a flat top called a deck

Answer 21

modern mansard roof

Question 22

A blank roof is most often found on barns and other outbuildings

Answer 22

gambrel

Question 23

this roof is essentially a gable type with two different slopes on each side of the peak and with the lower slope being steeper than the upper slope

Answer 23

gambrel

Question 24

this type of roof is used in industrial and institutional buildings to maximize light and ventilation

Answer 24

sawtooth

Question 25

This roof my be seen as two opposing shed roofs that meet at their lower edges in the middle of the building

Answer 25

butterfly

Question 26

pitched roofs should be vented at the highest point on the blank side directly over the fire or as close to it as safely possible

Answer 26

leeward

Question 27

the common pitch on a flat roof

Answer 27

2 in 12 pitch

Question 28

blank roofs differ from conventional flat roofs primarily in the location of their main roof beams

Answer 28

inverted

Question 29

the blank roof is built over an existing roof that has become so porous it does not keep out the rain and/or it sags sufficiently to allow rainwater to collect on the roof

Answer 29

rain

Question 30

blank deck roofs may present a hazard if lightweight plywood or OSB decking is used

Answer 30

wooden

Question 31

blank roofs consist of metal bar joists, which usually run across the narrow dimension of the building, and metal decking that is laid perpendicular to the joists

Answer 31

metal deck

Question 32

what are the two ways concrete roofs are constructed?

Answer 32

lightweight concrete is pured over metal decking, precast double-T panels

Question 33

blank roofs provide a smooth, hard surface that is structurally strong and highly resistant to fire, but it may be extremely difficult to breach for ventilation purposes

Answer 33

concrete roof

Question 34

lightweight concrete roofs(4 in or less thick) may be cut using?

Answer 34

a rotary saw with a masonry blade

Question 35

blank roof consist of bar joists or i-beams with brackets tack welded to the joists

Answer 35

poured gypsum

Question 36

the perimeter of the roof consists of steeply pitched sections that surround a flat roof area in the middle

Answer 36

modern mansard

Question 37

blank construction is typically used to support roofs with large, open spaces unobstructed by pillars or other supports

Answer 37

Arched construction

Question 38

the blank roof uses a wooden bottom chord or a steel tie rod for lateral support with turnbuckles to maintain proper tension

Answer 38

bowstring arch roof

Question 39

the blank roof is made up of a geometric, egg-crate or modified diamond pattern framework on which plank sheathing is laid

Answer 39

lamella roof

Question 40

firefighters can estimate the hazards of arched roof by?

Answer 40

the size of the lumber and the span of the arches

Question 41

blank roof constuction consists of laminated beams of various sizes that span the length or width of the building

Answer 41

panelized roof

Question 42

these trusses are designed with horizontal top and bottom chords that run parallel to each other

Answer 42

parallel chord trusses

Question 43

the blank effect of parallel chord trusses causes the top chord to always be in compression and the bottom chord in tension

Answer 43

bridging

Question 44

blank are the wather-resistant materials applied over the roof decking or sheathing

Answer 44

roof coverings

Question 45

the most common substrate is?

Answer 45

tar paper aka roofing felt

Question 46

these thick, heavily insulated roofs tend to hold heat longer than other roof coverings, which increases the likelihood of flashover or backdraft conditions developing

Answer 46

urethane/isocyanate foam

Question 47

this roof covering is highly combustible and liberate toxic products when they burn

Answer 47

single ply roofs (synthetic membrane)

Question 48

this roof covering carries more weight per unit of surface area than any other roof style and therefore be susceptible to early roof collapse

Answer 48

tile/slate

Question 49

most roof assemblies employ a parallel rafter system with rafters spaced from blank to blank inches

Answer 49

12-24

Question 50

cutting blank vents is often the fastest and most efficient way of opening a roof

Answer 50

louver

Question 51

with the center rafter cut the longest cut is made blank to the rafters

Answer 51

parallel

Question 52

when the dicing method is used the two longest cuts are made blank to the rafters

Answer 52

perpendicular