I1 - Roofing Materials - LT# 2

Question 1

What is the primary safety concern when working on roofs, and how is safety improved to reduce danger?

Answer 1

Falls when working at heights,
Use of fall protection

Question 2

What is a proper slope for an extension ladder and how high must it project above the upper landing (roof?)

Answer 2

4:1 (V:H) and 36” projection above upper landing

Question 3

On a surface below 10’, is fall protection required?

Answer 3

Only if the surface is jagged or rough.

Question 4

Define the term Fall Protection:

Answer 4

Includes: Guardrails, personal fall protection, safety nets, control zone, safety monitor system which includes a control zone

Question 5

Define the term Fall restraint:

Answer 5

Restricts travel using a harness or belt, with suitable & compatible components (D-Ring, Lifeline, and/or Lanyard, rope grab & anchor). A belt is allowed.

Question 6

Define the term Fall Arrest:

Answer 6

Prevents a falling worker from hitting any objects & from hitting the ground at any level below the work area. Includes Full body harness. Limit free fall to 4’

Question 7

How far above the eave should tools & equipment be stored?

Answer 7

2 Meters

Question 8

How can eavestroughs be protected from ladder damage?

Answer 8

Blocking or ladder standoffs

Question 9

What is the minimum joint offset between courses for wood shingles or shakes?

Answer 9

1.5”

Question 10

What is the narrowest shingle allowed for roofing?

Answer 10

3”

Question 11

What should be established on the ground for safety when stripping a roof for re-roofing?

Answer 11

A safety zone using barricades, or flagging & signage.

Question 12

Who installs most roofing?

Answer 12

Most roofing is subcontracted by the Carpenter. Carpenter is then responsible for the safety & other aspects of the roofer’s work.

Question 13

When might a carpenter do some roofing work?

Answer 13

Smaller job, like on a shed or addition.

Question 14

For a long roof life, the condition of:

Answer 14

Roof sheathing, underlay and eave protection is vital.

Question 15

What sort of ladder setup is needed to access a roof?

Answer 15

1) Use a single or extension ladder
2) Ladder projects 3” above the level of the landing
3) 4:1 RATIO (H:V)

Question 16

What is the safest way to bring materials onto the roof?

Answer 16

Hoist, rope or lift them onto the roof

Question 17

A fall protection system is used beyond which heights?

Answer 17

10 feet OR MORE

Question 18

What sort of fall protection is needed for flat roofs and roofs no greater than 4:12

Answer 18

1) Guardrail
2) Personal fall protection system
3) Safety nets
4) Control zone
5) Safety monitor system with control zone

Question 19

What sort of fall protection is acceptable for roofs with a slope ratio greater than 4:12 but less than 8:12

Answer 19

1) Guardrail
2) Personal fall protective system
3) Safety nets

Question 20

Should a control zone & safety monitor be utilized in a roof steeper than 4:12?

Answer 20

No

Question 21

What sort of fall protection is acceptable for roofs with a slope ratio greater than 8:12

Answer 21

1) Nailing toe boards in conjunction with a personal fall protection system or personnel safety nets
2) If working material is not fiqt for toe board (such as heavy materials) then workers should use roof ladders, or acceptable work platforms in conjunction with a personal fall protective system

Question 22

What are guardrail requirements (1st on the list of preferences)

Answer 22

1) 1.0 to 1.1 above the work surface
2) Consist of a top rail, mid rail and toeboard
3) Resistant to 125 lb horizontal load
4) Supported by uprights, max spacing of 2.4 to 3.0 m
5) Use a min. of 2x4 top rail for upright spaced at 2.4 m OC
6) Use a minimum of 2x6 top rail for uprights spaced at 3.0 OC
7) Use a mid rail of 1x6

Question 23

Define control zone:

Answer 23

The area between an unguarded edge of a building or structure and a line that is set back a specific distance.

Question 24

What is the minimum width of a control zone?

Answer 24

2 m (6.5’), sloped no steeper than 4:12 (v:h), non slippery.

Question 25

If a safety monitor is not used, a control zone must:

Answer 25

Be clearly marked with a raised line.

Question 26

A safety monitor must:

Answer 26

1) Be experienced in the work overseen & trained in the role of safety monitor
2) Be present at all times when a worker is in the control zone
3) Have complete authority when it relates to falling
4) Engage in no other duty
5) Be located to have clear and constant view of the work

Question 27

A safety monitor must monitor no more than:

Answer 27

8 workers

Question 28

Lanyard must provide how many feet of free fall?

Answer 28

4 feet

Question 29

What is a rope grab?

Answer 29

Connects the lanyard to the lifeline, these devices can be moved up and down the lifeline if pushed steadily.

Question 30

When a shock absorber is used, a lanyard’s freefall can be increased to:

Answer 30

2 m.

Question 31

Three types of lifelines:

Answer 31

Vertical, horizontal and retractable

Question 32

What is a designed fixed support?

Answer 32

Load-rated anchor designed for fall protection, permanent part of structure

Question 33

What is temporary fixed support?

Answer 33

Designed to be connected to the structure following specific installation instructions.

Question 34

What is an existing structural feature support?

Answer 34

Not designed for anchor, but approved by engineer

Question 35

What is the pendulum effect?

Answer 35

Further, you move from the anchor point, the greater chance of swinging during the fall, more swing means more force.

Question 36

Before using any fall arrest system greater than 25’, the employer must establish:

Answer 36

Written rescue procedures

Question 37

A worker dangling for more than ____ minutes will lose circulation in their legs, resulting in injury

Answer 37

4 minutes

Question 37

A worker dangling for more than ____ minutes will lose circulation in their legs, resulting in injury

Answer 37

4 minutes

Question 38

What is used for splitting and trimming shingles or shakes?

Answer 38

A roofer’s hatchet.

Question 39

What are the purposes of underlay material?

Answer 39

Provides a second layer of protection from weather and it cushions soft or thin roofing materials from the heads of the sheathing fasteners.

Question 40

Non-perforated asphalt-impregnated paper is used under

Answer 40

Asphalt shingles or tiles

Question 41

Perforated paper is used between each course of

Answer 41

Cedar shakes

Question 42

What does code ask for when overlapping underlay?

Answer 42

2”, but half lapping the sheets is a more solid practice

Question 43

A drip edge is needed where on a roof?

Answer 43

At the eaves, roofing required to be with a small drip edge of at least 1/2”

Question 44

How is an under-course installed (Asphalt shingle)

Answer 44

At the eave, consists of an upside-down layer of shingles fully covered by the first course of exposed shingles.

Question 45

How do you cap hips and ridges?

Answer 45

Capped with single tabs of three tap shingles. Cut the shingles into three pieces at cutout.

Question 46

How to install wood shingles?

Answer 46

Use a layer of wood shingles under the first course of wood shakes or shingles, the taper will kick the first course up to match the angle of the following courses

Question 47

How to fasten cedar shingles?

Answer 47

Hot dipped galvanized box nails, two nails per shingle

Question 48

Wood shingles should be spaced slightly apart, approx:

Answer 48

6 to 9 mm, space allow for expansion when they get wet

Question 49

Sapwood on shingles tends to:

Answer 49

Rot much faster than heartwood. Lighter in color, less dense.

Question 50

The hip and ridge capping of Cedar shingles is done:

Answer 50

Fitting individual shingles together, if making the caps, overlap the shingles left then right.

Question 51

How is windblown snow prevented from entering an attic when using shakes?

Answer 51

A strip of perforated #15 felt underlay is placed between each course of shakes.

Question 52

Wh