Collapse of BB CH9 Medium

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Questions and Answers

What is the reason for the flames shooting out of the burning apartment doorway?

A malfunction in the building's ventilation system

The strong wind blowing through the top floor residence (correct)

The presence of flammable materials in the apartment

The use of power saw by the firefighters

What is the purpose of climbing off the aerial ladder onto the flat rooftop of the fire building?

To vent the top floor and control the windblown smoke (correct)

To create a barrier against the spreading fire

To assess the structural damage caused by the fire

To search for survivors inside the burning apartment

What precaution do the firefighters take while proceeding on the roof in smoky conditions?

Hold hands to stay connected with each other

Use flashlights to illuminate the path

Keep body weight always on the rear leg (correct)

Crawl on all fours to avoid smoke inhalation

What does testing the roof deck's stability and support involve?

Pressing down with forward foot to test for stability Signup and view all the answers

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

To support roof decks Signup and view all the answers

What is the consequence of fire penetrating the fire-resistant ceiling and heating the steel bar joists?

The roof can collapse rapidly Signup and view all the answers

Why does NIST mention guesswork in the construction industry regarding fire protection of steel bar joists?

Due to uncertainty about required thickness of spray-on material Signup and view all the answers

Why is early identification of truss construction crucial for firefighters?

To ensure safe fire operations Signup and view all the answers

What type of construction are steel bar joists designed for?

Low hazard occupancy Signup and view all the answers

What is preferred over vertical ventilation when a 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 significant concern related to lightweight wood truss construction during a fire?

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

What feature of conventional solid wooden joist provides greater stability during a fire?

Wooden roof deck and closely spaced joist system Signup and view all the answers

In what way does a firefighter benefit from walking on a conventional wooden joist roof during a fire?

They can grab onto a beam and avoid falling into the fire below Signup and view all the answers

What is required for safe fire operations in buildings with steel or wood trusses?

Early identification, proper fire protection, and careful consideration of occupancy hazards. 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, where are the solid wood beams placed?

Within a recessed portion of a brick wall Signup and view all the answers

What type of beam is restrained at both ends?

Beam in brick cavity construction Signup and view all the answers

In corbel shelf construction, where are the wood joists resting?

On a girder or a brick shelf 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?

Cantilevered beam Signup and view all the answers

What is the third fact necessary to determine roof stability according to the text?

Whether the roof deck of the wood beam roof is directly attached to the roof beams or whether it has an intervening space so that the roof deck is resting on a smaller wood framework built up above the main roof supports. Signup and view all the answers

What was revealed as a possible cause of the fire blast which forced the firefighter away from the wall, toward the center of the fire-weakened roof?

A burned apartment gas meter. Signup and view all the answers

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

Roof collapses Signup and view all the answers

What type of roof construction poses increased risks to firefighters according to the text?

Modern lightweight roof construction Signup and view all the answers

What is a challenge in evaluating roof stability during firefighting operations?

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

What is emphasized in the text to ensure the safety of firefighters during firefighting operations?

Thorough training and knowledge of building construction Signup and view all the answers

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

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

What is a daily necessity during fires according to the text?

$Roof$ venting operations Signup and view all the answers

What type of support system and connection method is important for evaluating a roof's stability according to the text?

Knowledge of the support system and connection method Signup and view all the answers

What type of construction did the World Trade Center building have?

Lightweight construction with steel bar joist Signup and view all the answers

What should firefighters be trained in when operating in buildings with lightweight roof construction according to the text?

Defensive strategies Signup and view all the answers

What did the 10-year study by the National Fire Protection Association reveal about firefighter fatalities due to roof collapses?

$19$ out of $56$ Signup and view all the answers

What is the primary purpose of firefighters cutting vent holes on the roof of a building?

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

What challenges do firefighters face while working on the roof during ventilation?

Maintaining stability in a smoky and windy environment Signup and view all the answers

Who is responsible for ensuring safety during the roof ventilation operation?

The captain Signup and view all the answers

What tools do 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 notice about the water stream from the hose team below?

Lack of water stream, indicating a potential problem in the firefighting operation Signup and view all the answers

What does rapid change in visibility and conditions on the roof indicate?

Flames and smoke emerging from various parts of the building Signup and view all the answers

What is indicated by observing flames and smoke emerging from various parts of a building?

Presence of additional hazards inside the building Signup and view all the answers

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

Potential problem in firefighting operation Signup and view all the answers

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

A collapse hazard when walking on the improperly reconstructed roof section Signup and view all the answers

Why should firefighters be extremely cautious when encountering a freshly repaired roof section during daylight hours?

The repair may not have replaced the supporting beams, leading to potential falls Signup and view all the answers

What can happen if a firefighter walks on an improperly reconstructed roof section?

They can fall into concealed openings or through widely spaced supporting beams Signup and view all the answers

What may sometimes be mistaken for a scuttle cover on a roof?

Covered-over skylight opening Signup and view all the answers

Why might an owner cover the opening of a glass and metal skylight with a thin wood sheet and roofing paper?

Due to prohibitive repair costs Signup and view all the answers

What should a disoriented firefighter do when operating on a roof during a fire?

Get down on hands and knees and crawl Signup and view all the answers

What separates attached buildings at the rear half if they are connected at the front half by a party wall?

A shaft Signup and view all the answers

What should an experienced firefighter do when straddling an apparent party wall in smoky or dark conditions?

Drop a tool or object to listen for it striking the roof before crossing Signup and view all the answers

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

Helmet, gloves, hood, bunker type turnout gear, and an operable self-contained-breathing apparatus Signup and view all the answers

What is indicated by observing flames and smoke coming out of vent openings during firefighting operations?

Potential hazards for firefighters working on the roof Signup and view all the answers

Why might it be best for a disoriented firefighter to remain in place during smoky or dark conditions?

Until visibility improves or light is provided Signup and view all the answers

What could happen if a firefighter attempts to quickly evacuate the roof without noticing an opening due to darkness or smoke?

Fall into an open shaft or off the edge of the roof Signup and view all the answers

What is emphasized as good practice during firefighting operations on rooftops?

Assigning experienced and knowledgeable members to this duty Signup and view all the answers

What should be standard for all firefighters according to the text?

Comprehensive training in hazards presented by rooftop environment during fire conditions. 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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Description

Test your comprehension of a firefighting scene involving rooftop operations and communication between the firefighters and their commanding officer.