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Firefighter Procedures > Private Dwellings LW Ch 6 > Flashcards

Private Dwellings LW Ch 6 Flashcards

1
Q

Are Roof Ops allowed on LW PD roofs

A

When fire is on the Top fl and there is clear indication that the fire has NOT entered the cockloft, roof ops shall be limited to: checking rear and sides of bldg, Vent top flr windows and skylight, and inspecting HVAC vents.

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2
Q

What type of LW PD roofs can be cut with a saw?

A

Under NO Circumstances shall roof be cut in any Peaked or Flat roof bldg of LW construction. Conditions that would require a roof cut, the IC should consider exterior ops

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3
Q

T/F Fire in a PD cellar and conditions prevent ID of type of construction, an exam could be made in a similar attached exposure

A

True. Assignment made by IC to an available unit

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4
Q

LW PD fire: 2nd HL must BU 1st HL unless directed otherwise by IC. If so, 3rd HL must be positioned to BU 1st HL. IC shall special call Additional Eng for a structural fire in a bldg w/LW materials

A

True If fire cannot be quickly knocked down with 2 HLs, then an outside operation must be considered

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5
Q

Paramount importance of 1st Eng in PD LW construction fire

A

Positioning of 1st HL for a quick knockdown of a contents fire that has NOT extended to Structural components

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6
Q

Presence of smoke pushing at the floor line on the outside of a PD may be an indication of a fire in _

A

Trussloft. Possibility of collapse increases

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7
Q

Primary Emphasis for fire in LW PD under construction

A

Exterior attack UNLESS fire is MINOR or confined to a small area. Exterior streams from outside of collapse zone Ch 6

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8
Q

Once fire enters the concealed space containing LW trusses or joists, all members shall be directed not to enter the fire area or areas directly above fire until IC determines risk. This is especially true with _ and _

A

Open web design of LW Parallel Chord Wood and Composite Trusses. When heated gases build up in the concealed spaces of the trussloft and attic/cockloft there is a much greater potential for a backdraft to occur.

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9
Q

Does IC have to notify Dispatcher of LW construction PD

A

Transmit to Borough Dispatcher in preliminary and/or progress reports so that it can be relayed to responding units

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10
Q

When LW construction is suspected, an immediate examination of _ shall be conducted as soon as conditions permit

A

Ceiling Voids. Any LW system found- immediate notification to IC

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11
Q

A heavy fire and smoke conditions on a floor or in the cellar accompanied by little or no smoke condition on the floor or floors above may be an indication of _

A

Concrete or gypsum floor poured over corrugated steel (Q-decking) supported by C-Joists. Add’l dead load may lead to early floor collapse.

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12
Q

Laminated Wood I-Beams are comprised of 1/2” Oriented Strand Board (OSB) or 3/8-1/2” plywood members and 2X3 or 2X4” wood flanges that may span lengths of over _’

A

Over 60’. These I-Beams may have pre-engineered openings in the web to accommodate utilities

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13
Q

LW Parallel Chord Wood Truss has 2X3 and 2X4 wooden webs and chord members connected with sheet metal gusset plates (gang nails) that only penetrate _

A

1/4”-1/2” into wooden truss members. Gang nails are the weakest point of support system.

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14
Q

2 types of LW systems that have a Trussloft

A

LW Parallel Chord Truss and Composite Truss

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15
Q

T/F Any cantilevered deck/balcony should be considered a serious collapse potential

A

True

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16
Q

NYC Bldg Code requires LW constructed spaces between ceiling and the floor above or ceiling and floor above to be divided into approx equal areas of _ sq feet

A

500 sq feet or less unless the bldg is equipped with an automatic sprinkler system

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17
Q

Most common type of Peaked Roof found in LW PDs

A

Open Web LW Wood Truss

18
Q

Define Trussloft

A

Enclosed area between floors and ceiling where open truss construction is found.

19
Q

Collapse potential of heavier type of exterior finishing products (stone or brick veneer) anchored to the structure of PD w/metal straps or wire mesh

A

May potentially fail as one complete unit when exposed to fire and high heat

20
Q

Most important factor to a safe and successful operation at LW PD fires is _

A

Identification of presence of LW construction. Critical that any FF aware of LW construction notify IC

21
Q

Areas unsupported by columns with spans greater than _’ are generally an indication that LW construction is present

A

Greater than 25’. Collapse potential is greater than compared to compartmented area that has interior walls

22
Q

Paramount Importance in PDs w/LW construction

A

Positioning of 1st HL for early extinguishment or control of a contents fire that has not extended to the structural components

23
Q

_ is ALWAYS the primary consideration in bldgs constructed w/LW materials

A

Collapse

24
Q

PDs w/LW materials, if fire extends from contents to its structural components, collapse may occur _

A

Within 5-10 minutes with little or no warning signs

25
Q

Is collapse a primary consideration in “traditional” PDs

A

Early collapse is not a primary consideration. Generally estimated to 1 hour. However, when no ceiling and structural components exposed, failure can occur within 20 minutes

26
Q

In any building construction, the Critical area subject to failure as a result of fire is _

A

Point of Connection

27
Q

Incorrect PD fires
A. Early collapse is NOT a primary consideration at traditional PDs
B. In traditional PDs one hour is amount of time before collapse is estimated to occur
C. In traditional PDs when there is no ceiling to protect structural components, 30 minutes is amount of time before collapse is estimated to occur
D. When fire extends to the structural components in PD w/LW materials, collapse may occur suddenly with little/no warning within 5-10 minutes

A

C 20 minutes

28
Q 
Which of the following LW materials when used as beams to support flrs would create truss lofts?
A. Laminated wooden I-beams
B. LW parallel chord wood truss
C. Metal C-joists
D. Composite truss
A

B D LW parallel chord wood truss and composite truss

29
Q

Choose the correct
A. LW wood truss peaked roof exposed to sufficient fire can be expected to collapse as one complete unit into the structure
B. Plywood burns rapidly and fails fast, allowing fires that extend to the cockloft/attic area to quickly vent through the roof
C. Weakest point of LW parallel wood chord truss is sheet metal gusset plates
D. Metal C-joists must be braced w/strapping to prevent them from twisting

A

All are correct

30
Q

Choose incorrect LW PD fire
A. IC shall ensure all members are made aware of presence of LW construction
B. Dispatch shall be advised in preliminary and progress reports of presence of LW construction
C. Immediate inspection of ceiling voids should be conducted as soon as conditions permit- an inspection hole made immediately upon entering 1st fl
D. If fire enters concealed spaces w/LW construction all members shall be directed not to enter fire area or areas above until IC determines risk- especially when C joists and Wooden I beams are involved

A

D LW Parallel Wood Chord and Composite trusses (trusslofts)

31
Q

2 story PD under construction w/LW materials correct for interior attack
A. Only if fire is minor
B. Only if fire is confined to small area
C. Only if fire is minor or confined to small area
D. Only if fire is minor/medium or confined to small area
E. Under no circumstances should an interior attack be conducted in an unoccupied PD under construction w/LW construction

A

C

32
Q 
New type of PD w/smoke pushing at 2nd fl line on outside of bldg should suspect
A. Laminated wood I-beam
B. Open web truss
C. Metal C joists
D. Ordinary construction
A

B. Open web truss (trussloft)

33
Q 
Fire in a 2 1/2 story PD w/LW construction. Medium fire condition on 1st fl and no window bars. You would be correct to request an additional 
A. Engine
B. Ladder
C. Engine and Ladder
D. Ladder and BC
A

A

34
Q 
Indiscriminate removal of plasterboard on ceilings and walls during overhaul stage can cause instability in PDs of LW construction, especially bldgs w/
A. Laminated wood I beam
B. Open web truss
C. Metal C joists
D. Ordinary construction
A

C

35
Q

Which situation can you cut the roof of peaked/flat roof PD w/LW construction
A. Inspection holes only at a top fl fire
B. Top fl fire w/clear indication that fire not entered the cockloft
C. Fire on a fl other than top fl w/clear indication that fire has not entered cockloft
D. Only from safety of TL when necessary
E. Under no circumstances shall roof be cut in any peaked or flat roof bldg of LW construction

A

E

36
Q

T/F If size-up of PD fire determines that the fire involves only the contents and has not extended to the structural components, then standard tactics for PD fires are generally appropriate

A

True

37
Q

LW PD: CIDS states the building was constructed using lightweight wood trusses. Incorrect
A: Positioning 1st hoseline for a quick knock-down of a contents fire that has not extended to the structural components is of paramount importance.
B: Spacing between LW flr supports is 24” apart, the potential exists for a larger opening to be formed for members to fall through to flr below.
C: IC shall special call an add’l Eng for a structural fire in a PD constructed of LW materials.
D: When the fire is of such magnitude that it cannot be quickly knocked down with one hoseline, an outside operation Is mandatory.

A

D. sect 4.2.3 - When the fire is of such magnitude that it cannot be quickly knocked down with TWO hoselines, then an outside operation must be considered

38
Q

PD fire w/LW C-Joist construction. 1st HL correct
A. 1st HL must be stretched through front door
B. Only a Chief Off may consider opening 1st HL into cellar window for quick knockdown
C. Operating 1st line into cellar window should be considered due to presence of C-joist construction
D. Bilco style doors should never be used for HL placement

A

C
A After size-up, 1st HL should be stretched to the entrance door that provides the quickest access to the cellar in order to extinguish the fire
B The IC (Chief or Company Officer)
D least desirable of the secondary entrances and shall not be utilized for HL placement unless it is the only option

39
Q

Correct factors that would preclude descent of 1st HL down interior cellar stairs in PD cellar fire
A. High heat at bottom of stairs
B. Questionable stability of stairway
C. Initial size up indicating a serious fire condition
D. All of the above

A

B C

A High heat to TOP of stairs

40
Q

The IC shall immediately be notified and consider all of the following EXCEPT?
A: The IC shall ensure all members on scene are made aware of the presence of lightweight construction.
B: Once lightweight construction is discovered, this information shall be transmitted to the borough dispatcher in the preliminary and/or progress reports so that it can be relayed to responding units.
C: All members shall be directed not to enter the fire area or areas directly above the fire until the IC determines the risk of a planned coordinated interior attack. This is especially true with laminated wood I-beams.
D: When heated gases build up in the concealed spaces of the trussloft and attic/cockloft, there is a much greater potential for a backdraft to occur.

A

C This is especially true with the open-web design of lightweight parallel chord wood and composite trusses.
PD Ch 6 4.1.3, 4.1.4

Firefighter Procedures (20 decks)

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