Collapse of BB CH9 Hard
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Questions and Answers

What is the main reason the first attack hoseline cannot advance?

  • Malfunction in the hose
  • Extreme heat and flames shooting out of the burning apartment doorway (correct)
  • Lack of water pressure in the hose
  • Obstruction in the hallway

    • Why are the flames shooting out of the doorway into the path of the firefighters being driven by a strong wind?

  • A strong wind blowing through the top floor residence (correct)
  • Gas leak in the building
  • Explosion inside the apartment
  • Faulty building ventilation system

    • What is the purpose of venting the top floor as ordered by the chief?

  • To release smoke and heat from the building (correct)
  • To provide an escape route for firefighters
  • To create a controlled burn to contain the fire
  • To rescue trapped occupants on the top floor

    • Why do firefighters proceed cautiously on the rooftop in smoke?

    <p>Limited visibility due to windblown smoke</p> Signup and view all the answers

    What is a major hazard for firefighters working on flat roofs of burning buildings?

    <p>Potential roof collapses and subsequent entrapment in the fire</p> Signup and view all the answers

    What did a 10-year study by the National Fire Protection Association reveal about firefighter fatalities?

    <p>19 out of 56 firefighters were killed by roof collapses</p> Signup and view all the answers

    Why is evaluating roof stability challenging during firefighting operations?

    <p>Insulation conceals fire heat and roof instability</p> Signup and view all the answers

    What type of modern lightweight roof construction poses increased risks to firefighters?

    <p>Steel bar joist, wood truss, and metal C-beams</p> Signup and view all the answers

    What should firefighters be trained in for operating in buildings with lightweight roof construction?

    <p>Defensive strategies</p> Signup and view all the answers

    What does the text suggest about the importance of understanding roof construction?

    <p>It is crucial for ensuring the safety of firefighters during firefighting operations</p> Signup and view all the answers

    Why is evaluating a roof's stability challenging during firefighting operations?

    <p>Necessary information may not always be readily available during firefighting operations.</p> Signup and view all the answers

    What type of construction did the World Trade Center building have that posed risks to firefighters?

    <p>Long-span, steel bar joist construction unsupported by columns or girders.</p> Signup and view all the answers

    What is emphasized in the text regarding new construction?

    <p>Firefighters should conduct pre-fire plan inspections of new construction.</p> Signup and view all the answers

    What type of roof construction is less stable under fire conditions than brick cavity construction?

    <p>Corbel shelf construction</p> Signup and view all the answers

    In brick cavity construction, how are the solid wood beams placed within a recessed portion of a brick wall?

    <p>Rigidly held in position</p> Signup and view all the answers

    What can a beam end encased in a brick cavity provide support as, if the center of the roof is weakened by fire?

    <p>A cantilevered beam</p> Signup and view all the answers

    What type of roof joists are most H type apartment roof joists resting on?

    <p>Corbel shelf</p> Signup and view all the answers

    What can cause a firefighter to prematurely evacuate their position on an inverted roof, even if the main supports are still stable?

    <p>A softening of the inverted roof surface causing members to think the roof was about to collapse</p> Signup and view all the answers

    What is the third fact necessary to determine roof stability for firefighters?

    <p>Knowing whether the roof deck of the wood beam roof is directly attached to the roof beams or whether it has an intervening space</p> Signup and view all the answers

    In corbel shelf construction, what happens when the center of the beam is burned away?

    <p>The beam ends may rotate off their resting position towards the center of the collapse area.</p> Signup and view all the answers

    What did Firefighter John McKenna die from as he was evacuating a roof?

    <p>The fire-weakened roof collapsed under his weight and the beam ends rotated off the corbel shelf.</p> Signup and view all the answers

    What is the main purpose of steel bar joists in commercial structures?

    <p>To support roof decks and replace wooden joists</p> Signup and view all the answers

    What can cause a steel bar joist roof system to collapse rapidly during a fire?

    <p>Exposure of steel bar joists to fire after penetrating the fire-resistant ceiling</p> Signup and view all the answers

    Why does the construction industry face guesswork in determining the necessary thickness of spray-on material for fire protection?

    <p>NIST's statement about the lack of scientific basis for deciding the necessary thickness</p> Signup and view all the answers

    Why is early identification of truss construction crucial for firefighters in buildings with steel or wood trusses?

    <p>To ensure safe fire operations and prevent rapid roof collapse</p> Signup and view all the answers

    What type of construction is steel bar joist designed for?

    <p>Low hazard occupancy</p> Signup and view all the answers

    What type of ventilation is preferred when a fire building has a steel bar joist system supporting the roof?

    <p>Horizontal ventilation of windows and doors</p> Signup and view all the answers

    What is a disadvantage associated with lightweight wood truss construction during a fire?

    <p>It can fail rapidly within 5 to 10 minutes of exposure to fire</p> Signup and view all the answers

    What distinguishes conventional solid wooden joists from lightweight counterparts during a fire?

    <p>Greater stability and warning signs before collapse due to its closely spaced joist system</p> Signup and view all the answers

    What is the primary purpose of cutting vent holes in the roof during a firefighting operation?

    <p>To release smoke and heat from a fire inside the building</p> Signup and view all the answers

    What tools do the firefighters use to cut vent holes in the roof?

    <p>Power saws</p> Signup and view all the answers

    What does the observation of flames and smoke coming out of the vent openings indicate?

    <p>Effectiveness of the ventilation operation</p> Signup and view all the answers

    What does the captain use to ensure safety during the roof ventilation operation?

    <p>Hand signals and tools</p> Signup and view all the answers

    What does the lack of water stream from the hose team below indicate?

    <p>A potential problem in the firefighting operation</p> Signup and view all the answers

    What does the captain plan for after observing flames and smoke emerging from various parts of the building?

    <p>A search and rescue operation using a gooseneck ladder</p> Signup and view all the answers

    What is one of the challenges faced by firefighters while cutting vent holes in the roof?

    <p>A soft and spongy roof deck</p> Signup and view all the answers

    What is one of the responsibilities of the captain during the rooftop firefighting ventilation procedure?

    <p>Assessing potential hazards and ensuring safety</p> Signup and view all the answers

    What can cause a firefighter to fall through a roof to the floor below?

    <p>Walking on a temporary repair with thin roofing paper</p> Signup and view all the answers

    What should firefighters be cautious of during daylight hours when encountering a freshly repaired roof section?

    <p>Avoid walking on any repaired sections</p> Signup and view all the answers

    What is the potential danger associated with a common scuttle cover on a roof?

    <p>It is not designed to support the weight of a firefighter</p> Signup and view all the answers

    What hazard is presented by laying a thin layer of roofing paper over an opening without replacing the roof decking or beams?

    <p>A collapse hazard</p> Signup and view all the answers

    What is a potential hazard presented by a common scuttle cover on a roof?

    <p>It is designed to cover a roof opening but not to support the weight of a firefighter</p> Signup and view all the answers

    What danger can be created when a temporary repair to a roof is made by laying roofing paper over an opening without replacing the roof decking or beams?

    <p>A collapse hazard due to concealed openings and lack of supporting beams</p> Signup and view all the answers

    During daylight hours, what caution should firefighters take when encountering a freshly repaired roof section in a partly vacant building or one that has experienced a previous fire?

    <p>Avoid walking on any repaired sections</p> Signup and view all the answers

    What can happen if supporting beams are absent or widely spaced in lightweight constructed roofs?

    <p>Firefighters could fall through to the floor below</p> Signup and view all the answers

    What may appear to be a scuttle cover on a roof but is actually a covered-over skylight opening?

    <p>A glass and metal skylight</p> Signup and view all the answers

    What reasoning might an owner use for not reinforcing the cover used to replace a glass and metal skylight?

    <p>The original skylight was not designed to support a person</p> Signup and view all the answers

    What should a disoriented firefighter do if operating on a large open rooftop?

    <p>Get down on hands and knees and crawl</p> Signup and view all the answers

    What feature can easily be scaled by a firefighter seeking access to the roof of the fire building from an adjoining building?

    <p>Front party wall connected to an adjoining building</p> Signup and view all the answers

    What should an experienced firefighter do when straddling an apparent party wall in smoke or darkness?

    <p>Drop a tool or other object, and listen for it to strike the roof he intends to step down on</p> Signup and view all the answers

    What is considered the last line of defense for a firefighter who is trapped in a fiery environment?

    <p>Helmet and operable self-contained-breathing apparatus</p> Signup and view all the answers

    What could cause a firefighter to fall into an open shaft or walk off the edge of a roof during firefighting operations?

    <p>Vent openings or trench cuts made during the fire</p> Signup and view all the answers

    What should firefighters do if there is no immediate danger while momentarily blinded by smoke or darkness?

    <p>Remain in place until the wind changes and the smoke clears, or light is provided</p> Signup and view all the answers

    What should firefighters use to feel for the presence of the roof deck and its stability when evacuating from a disoriented position on the rooftop?

    <p>Tool or outstretched leg</p> Signup and view all the answers

    What should be assigned as good practice during rooftop firefighting operations due to many dangers existing on rooftops?

    <p>Be aware of potential hazards and maintain situational awareness</p> Signup and view all the answers

    Study Notes

    Firefighting Roof Ventilation Procedure

    • Firefighters are on the roof of a building, cutting vent holes to release smoke and heat from a fire inside
    • The firefighters are working in a smoky and windy environment, facing challenges in maintaining stability
    • The captain assesses the roof's stability and guides the firefighters in their tasks
    • The captain ensures safety during the roof ventilation operation, using hand signals and tools
    • The firefighters use power saws to cut vent holes in the roof, facing the challenge of a soft and spongy roof deck
    • The captain checks for potential hazards and ensures no one has collapsed inside the smoke-filled building
    • Flames and smoke are observed coming out of the vent openings, indicating the effectiveness of the ventilation operation
    • The captain plans for a search and rescue operation using a gooseneck ladder leading from a fire escape landing
    • The captain notices a lack of water stream from the hose team below, indicating a potential problem in the firefighting operation
    • The visibility and conditions on the roof change rapidly, with flames and smoke emerging from various parts of the building
    • The captain remains vigilant and assesses the situation, ensuring the safety and effectiveness of the firefighting operation
    • The text provides a detailed account of the challenges, actions, and decision-making involved in a rooftop firefighting ventilation procedure

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    Test your understanding of a firefighting scenario involving completing a roof and top floor venting assignment and reporting to the chief-in-command. Read the passage and answer questions to see how well you comprehend the situation.

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