07 Sloping Peak Roof Collapse

Question 1

What are the collapse hazards of a peaked roof?

Answer 1

1. Falling hazards
2. Structural framing
3. Roof deck
4. Slate or tile shingles

Question 2

The three most common types of sloping roofs are?

Answer 2

1. Gable roof
2. Hip roof
3. Gambrel roof

Question 3

The less common types of sloping roofs are?

Answer 3

1. Shed
2. Mansard

Question 4

Primary Structural Elements: Flat Roof

Answer 4

2 - Two Bearing Walls

Question 5

Primary Structural Elements: Gable Roof

Answer 5

3 - Two bearing walls, one ridge rafter

Question 6

Primary Structural Elements: Hip Roof

Answer 6

9 - Four bearing walls, one ridge rafter, four hip rafters

Question 7

The three most common types of wood construction used for sloping roofs are:

Answer 7

1. Timber Truss
2. Plank-and-beam
3. Rafter

Question 8

Which is the safest roof to walk on?

Answer 8

Rafter - it has the least area of unsupported roof deck

Question 9

Which has the most area of unsupported roof deck?

Answer 9

The truss roof

Question 10

Where is roof rot found most often?

Answer 10

The roof edges
Where roofs change slope
Where a sloping roof abuts a vertical plane

Question 11

One slate or tile shingle can be 2 inches thick and weigh up to _____________.

Answer 11

10 pounds

Question 12

What are some of the causes of slate or tile shingle collapse?

Answer 12

1. The wooden roof deck to which the shingles are nailed can be destroyed by fire.
2. All stone is adversely affected by sudden changes in temps - cracks/breaks when heated by flames
3. A powerful hose stream striking a sloping roof can drive slate or tile from the rooftop to fly into the air

Question 13

What does a pitch of “4 in 12” mean to a sloped roof?

Answer 13

That there is 4 units of rise to 12 units of rafter span.

Question 14

What would be a low-, medium-, and high-pitched roof?

Answer 14

1. 2 in 12
2. 5-6 in 12
3. 15 in 12

Question 15

Can high-pitched roofs be walked on?

Answer 15

Not safely, not even with the assistance of a roof ladder

Question 16

What is another danger of slate and tile shingle roofs?

Answer 16

They conceal a fire-weakened roof structure

Question 17

What are the two ways FFs can protect themselves when working on a sloped roof?

Answer 17

Use a roof ladder hooked to the ridge rafter or work from an aerial/tower ladder.

Question 18

What is a more efficient way of removing smoke from a residential home with a sloping roof than cutting a vent opening?

Answer 18

By opening top-floor windows