Collapse of BB CH9 Hard

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Questions and Answers

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

Extreme heat and flames shooting out of the burning apartment doorway

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

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

To release smoke and heat from the building

Why do firefighters proceed cautiously on the rooftop in smoke?

Limited visibility due to windblown smoke Signup and view all the answers

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

Potential roof collapses and subsequent entrapment in the fire Signup and view all the answers

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

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

Why is evaluating roof stability challenging during firefighting operations?

Insulation conceals fire heat and roof instability Signup and view all the answers

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

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

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

Defensive strategies Signup and view all the answers

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

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

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

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

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

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

What is emphasized in the text regarding new construction?

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

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

Corbel shelf construction 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?

Rigidly held in position 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?

A cantilevered beam Signup and view all the answers

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

Corbel shelf 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?

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

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

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

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

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

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

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

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

To support roof decks and replace wooden joists Signup and view all the answers

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

Exposure of steel bar joists to fire after penetrating the fire-resistant ceiling 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?

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

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

To ensure safe fire operations and prevent rapid roof collapse Signup and view all the answers

What type of construction is steel bar joist designed for?

Low hazard occupancy 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?

Horizontal ventilation of windows and doors Signup and view all the answers

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

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

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

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

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

To release smoke and heat from a fire inside the building Signup and view all the answers

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

Power saws Signup and view all the answers

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

Effectiveness of the ventilation operation Signup and view all the answers

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

Hand signals and tools Signup and view all the answers

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

A potential problem in the firefighting operation Signup and view all the answers

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

A search and rescue operation using a gooseneck ladder Signup and view all the answers

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

A soft and spongy roof deck Signup and view all the answers

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

Assessing potential hazards and ensuring safety Signup and view all the answers

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

Walking on a temporary repair with thin roofing paper Signup and view all the answers

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

Avoid walking on any repaired sections Signup and view all the answers

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

It is not designed to support the weight of a firefighter 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?

A collapse hazard Signup and view all the answers

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

It is designed to cover a roof opening but not to support the weight of a firefighter 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?

A collapse hazard due to concealed openings and lack of supporting beams 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?

Avoid walking on any repaired sections Signup and view all the answers

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

Firefighters could fall through to the floor below 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?

A glass and metal skylight 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?

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

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

Get down on hands and knees and crawl 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?

Front party wall connected to an adjoining building Signup and view all the answers

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

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

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

Helmet and operable self-contained-breathing apparatus 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?

Vent openings or trench cuts made during the fire Signup and view all the answers

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

Remain in place until the wind changes and the smoke clears, or light is provided 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?

Tool or outstretched leg Signup and view all the answers

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

Be aware of potential hazards and maintain situational awareness 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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