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CSCS Roof Felting study materials
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CSCS Roof Felting practice questions

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Question 1Health, Safety and Welfare in Roof Felting Work

When working at height on a roof, which type of protection should be given first priority under the hierarchy of control?

  1. Relying on personal fall-arrest harnesses
  2. Using warning signs and barriers
  3. Providing training in ladder use
  4. Eliminating the need to work at height where possible Correct answer.

Explanation

The hierarchy of control requires eliminating the hazard first, so avoiding work at height altogether is the preferred option. Collective measures and personal protective equipment are only considered when elimination is not reasonably practicable.

Question 2Health, Safety and Welfare in Roof Felting Work

What is the primary purpose of a roof edge guardrail system during felting work?

  1. To anchor ladders securely
  2. To support the weight of roofing materials
  3. To provide collective fall prevention at the edge Correct answer.
  4. To keep rainwater off the work area

Explanation

Guardrails are a collective fall-prevention measure that protects everyone at the edge without relying on individual behaviour. They must be of adequate strength and height to prevent falls.

Question 3Health, Safety and Welfare in Roof Felting Work

A worker must cross a fragile roof surface to reach a felting area. Which control is most appropriate?

  1. Walking carefully along the line of the purlins
  2. Crossing quickly to minimise time on the surface
  3. Increasing the number of workers to watch for cracks
  4. Using crawling boards or stagings that spread the load Correct answer.

Explanation

Fragile surfaces cannot be relied upon to support weight, so load-spreading platforms such as crawling boards or stagings must be used. Careful walking or speed does not remove the risk of falling through.

Question 4Health, Safety and Welfare in Roof Felting Work

Which document should be consulted to understand the specific site hazards and controls before starting felting work?

  1. The company holiday rota
  2. The site risk assessment and method statement Correct answer.
  3. The manufacturer's datasheet for the felt
  4. The customer's invoice

Explanation

The risk assessment and method statement set out the identified hazards and the controls to be followed on site. Workers must read and understand them before commencing work.

Question 5Health, Safety and Welfare in Roof Felting Work

What is the main hazard associated with using a gas torch to apply torch-on felt?

  1. Fire and burns from the naked flame Correct answer.
  2. Excessive noise exposure
  3. Vibration white finger
  4. Electrical shock from the torch

Explanation

Open-flame torches present serious fire and burn risks, particularly near combustible materials. Hot work permits and fire watch arrangements are typically required.

Question 6Health, Safety and Welfare in Roof Felting Work

Before commencing hot works with a torch, what should be confirmed?

  1. That a hot work permit has been issued and firefighting equipment is available Correct answer.
  2. That the felt has been pre-cut to size
  3. That the client has signed the completion certificate
  4. That the weather forecast is dry for the week

Explanation

Hot work requires a permit and suitable firefighting equipment to be in place before work starts. This controls the fire risk and ensures a response is possible if ignition occurs.

Question 7Health, Safety and Welfare in Roof Felting Work

After hot works finish, why is a fire watch maintained for a period?

  1. To record the amount of gas used
  2. To detect smouldering materials that may ignite later Correct answer.
  3. To monitor worker fatigue
  4. To check the quality of the felt seams

Explanation

Smouldering combustion can develop unnoticed after torching and later break into fire. A post-work fire watch allows such hotspots to be detected and dealt with.

Question 8Health, Safety and Welfare in Roof Felting Work

Which of the following is the correct action if a worker discovers a fire during felting work?

  1. Wait to see if the fire goes out on its own
  2. Continue working until the break
  3. Try to finish the current seam first
  4. Raise the alarm and evacuate following the site procedure Correct answer.

Explanation

On discovering a fire, the alarm must be raised immediately and the site evacuation procedure followed. Delaying allows the fire to grow and endangers others.

Question 9Health, Safety and Welfare in Roof Felting Work

What is the purpose of a toolbox talk before starting a felting task?

  1. To assess each worker's pay grade
  2. To inspect the client's property
  3. To order additional materials
  4. To brief the team on specific hazards and controls for the day's work Correct answer.

Explanation

Toolbox talks communicate task-specific hazards, controls and changes to the team. They reinforce the risk assessment and method statement at the point of work.

Question 10Health, Safety and Welfare in Roof Felting Work

Which type of footwear is most appropriate for working on a roof surface?

  1. Trainers with soft soles
  2. Safety footwear with slip-resistant soles Correct answer.
  3. Open-toed sandals
  4. Smooth leather dress shoes

Explanation

Slip-resistant safety footwear reduces the risk of slipping on wet or sloped roof surfaces. Footwear must also provide toe protection against impact.

Question 11Health, Safety and Welfare in Roof Felting Work

When handling rolls of roofing felt, which technique helps prevent manual handling injury?

  1. Twisting the torso while lifting
  2. Carrying the roll at arm's length
  3. Keeping the load close to the body and bending the knees Correct answer.
  4. Lifting with straight legs and a bent back

Explanation

Good manual handling technique keeps the load close, uses the leg muscles and avoids twisting. This reduces strain on the back and shoulders.

Question 12Health, Safety and Welfare in Roof Felting Work

Which hazard is most associated with hot bitumen or molten felt adhesive?

  1. Exposure to ionising radiation
  2. Risk of electrocution
  3. Severe burns from splashes and spillages Correct answer.
  4. Hearing damage from high noise levels

Explanation

Hot bitumen and molten adhesives can cause severe burns if they splash or spill. Suitable PPE and safe handling procedures are essential.

Question 13Health, Safety and Welfare in Roof Felting Work

Why must solvent-based felt adhesives be used in a well-ventilated area?

  1. To prevent the build-up of flammable and harmful vapours Correct answer.
  2. To reduce the cost of the product
  3. To speed up curing of the adhesive
  4. To keep the adhesive warm

Explanation

Solvent-based adhesives release flammable and potentially harmful vapours. Good ventilation keeps concentrations below dangerous levels and reduces fire and health risks.

Question 14Health, Safety and Welfare in Roof Felting Work

Which of the following best describes the correct use of a fall-arrest harness?

  1. It is worn loosely for comfort during long shifts
  2. It replaces the need for edge protection
  3. It is fitted correctly and anchored to a suitable anchorage point Correct answer.
  4. It is attached to any convenient pipe or cable

Explanation

A fall-arrest harness must be correctly fitted and connected to a suitably rated anchorage. It is a last line of defence and does not replace collective measures.

Question 15Health, Safety and Welfare in Roof Felting Work

What should be done before using a fall-arrest harness that has been involved in a fall?

  1. Replace only the lanyard
  2. Withdraw it from service and have it inspected by a competent person Correct answer.
  3. Clean it and return it to the store
  4. Continue using it if no visible damage is seen

Explanation

Equipment that has arrested a fall may have hidden damage and must be withdrawn and inspected by a competent person before reuse. Some equipment must be discarded entirely.

Question 16Health, Safety and Welfare in Roof Felting Work

Which weather condition should prompt a review of roof felting work?

  1. Light cloud cover
  2. A mild temperature
  3. High winds that could affect stability or materials Correct answer.
  4. Low humidity

Explanation

High winds can destabilise workers and blow materials or equipment, so work should be reviewed or stopped. Other conditions such as ice or heavy rain also affect safety.

Question 17Health, Safety and Welfare in Roof Felting Work

What is the correct way to store roofing felt rolls on site to reduce fire risk?

  1. Loose on the roof edge
  2. Next to the gas cylinders used for torching
  3. In a designated area away from ignition sources Correct answer.
  4. Stacked against a heater to keep them pliable

Explanation

Felt rolls are combustible and should be stored in a designated area away from ignition sources. Good housekeeping reduces the risk of fire spreading.

Question 18Health, Safety and Welfare in Roof Felting Work

What does a safety data sheet (SDS) for a roofing adhesive provide?

  1. The customer's payment terms
  2. The delivery schedule
  3. Hazard, handling and first-aid information for the product Correct answer.
  4. The colour options available

Explanation

An SDS provides essential information on hazards, safe handling, storage and first-aid measures for a substance. It supports the risk assessment for the product.

Question 19Health, Safety and Welfare in Roof Felting Work

Which of the following is a suitable control for reducing the risk of falling through a roof light?

  1. Asking workers to avoid the area
  2. Placing a cone next to the roof light
  3. Painting the roof light a bright colour
  4. Covering or guarding the roof light to prevent access Correct answer.

Explanation

Roof lights are fragile and should be covered or guarded so they cannot be stood on or fallen through. Physical protection is more reliable than warnings alone.

Question 20Health, Safety and Welfare in Roof Felting Work

What is the primary reason for keeping the work area below a roof felting task clear of people?

  1. To allow vehicles to park closer
  2. To reduce noise complaints
  3. To protect those below from falling materials and tools Correct answer.
  4. To improve the appearance of the site

Explanation

Materials and tools can fall from height and strike people below, so exclusion zones are used to keep the area clear. This protects both workers and the public.

Question 21Health, Safety and Welfare in Roof Felting Work

Which of the following is the correct action if a ladder used for access to the roof is found to be damaged?

  1. Lean it against a different wall
  2. Shorten it to remove the damaged part
  3. Use it carefully for one more day
  4. Take it out of service and tag it as defective Correct answer.

Explanation

Damaged access equipment must be withdrawn from service and clearly marked to prevent use. It should then be repaired or replaced by a competent person.

Question 22Health, Safety and Welfare in Roof Felting Work

Why is it important to secure ladders against slipping when used for roof access?

  1. To prevent the ladder from moving and causing a fall Correct answer.
  2. To comply with the client's decoration preferences
  3. To reduce the ladder's weight
  4. To make the ladder easier to climb

Explanation

An unsecured ladder can slip or move while in use, leading to a fall. Ladders should be tied, footed or otherwise secured before climbing.

Question 23Health, Safety and Welfare in Roof Felting Work

A worker is unsure whether a roof surface is fragile. What is the most appropriate course of action?

  1. Ask a colleague to walk across first
  2. Test it by jumping on it
  3. Treat it as fragile until confirmed otherwise by a competent person Correct answer.
  4. Assume it is safe if it looks solid

Explanation

Where fragility is uncertain, the precautionary approach is to treat the surface as fragile until a competent person confirms otherwise. This prevents falls through unassessed surfaces.

Question 24Health, Safety and Welfare in Roof Felting Work

Which of the following best describes a permit-to-work system for hot works?

  1. A formal authorisation confirming controls are in place before work starts Correct answer.
  2. A record of hours worked
  3. A list of materials required
  4. A verbal agreement between workers

Explanation

A permit-to-work is a formal document confirming that specified controls are in place before high-risk work such as hot works begins. It provides accountability and a clear record.

Question 25Health, Safety and Welfare in Roof Felting Work

What should be included in an emergency plan for roof felting work?

  1. Rescue arrangements for a worker suspended in a harness Correct answer.
  2. The menu for the site canteen
  3. The colour scheme of the safety signage
  4. The delivery times of materials

Explanation

Emergency planning must include rescue arrangements, as a worker suspended in a fall-arrest harness can suffer suspension trauma and needs prompt rescue.

Question 26Health, Safety and Welfare in Roof Felting Work

Which piece of personal protective equipment is most important for protecting the hands when handling hot bitumen during felting work?

  1. Heat-resistant gloves Correct answer.
  2. Cotton gardening gloves
  3. Fingerless leather gloves
  4. Disposable latex gloves

Explanation

Hot bitumen can cause severe burns, so gloves must resist heat and resist penetration. Heat-resistant gloves are designed for this, whereas thin or open gloves offer little protection against molten material.

Question 27Health, Safety and Welfare in Roof Felting Work

When working at height on a roof edge without guardrails, which control should be considered first in the hierarchy of control?

  1. Avoid the need to work at the edge by relocating the task Correct answer.
  2. Rely on a fall-arrest harness
  3. Instruct workers to stay back from the edge
  4. Use a warning line at the edge

Explanation

The hierarchy of control places elimination and avoidance above reliance on personal protective equipment. Removing the need to work near the edge removes the hazard entirely, which is more reliable than any fall-arrest system.

Question 28Health, Safety and Welfare in Roof Felting Work

A worker needs to cross a fragile roof to reach a felting task. What is the correct approach to access?

  1. Step only on the fixing bolts of the fragile sheets
  2. Walk directly on the fragile sheets while keeping to the line of the supports
  3. Use crawling boards or staging that spread the load across the fragile surface Correct answer.
  4. Cross quickly to minimise the time on the fragile area

Explanation

Fragile surfaces cannot be relied upon to support a person's weight, so load-spreading equipment such as crawling boards or staging is required. Walking on the sheets or fixings does not remove the risk of the sheet giving way.

Question 29Health, Safety and Welfare in Roof Felting Work

Which of the following is the main purpose of edge protection such as guardrails on a roof?

  1. To provide a handhold for climbing onto the roof
  2. To mark the boundary of the client's property
  3. To support the weight of felt rolls during storage
  4. To prevent people and materials from falling from the roof edge Correct answer.

Explanation

Guardrails form a physical barrier that stops workers and loose materials reaching the edge and falling. They are not designed as climbing aids, load-bearing storage, or boundary markers.

Question 30Health, Safety and Welfare in Roof Felting Work

Why should a gas torch used for felting be fitted with a flashback arrestor?

  1. To stop a flame travelling back into the hose or cylinder Correct answer.
  2. To increase the flame temperature for faster melting
  3. To allow the torch to be left unattended safely
  4. To reduce the gas consumption during use

Explanation

A flashback arrestor prevents a flame from propagating back through the hose into the gas source, which could cause an explosion. It does not change flame temperature, gas use, or allow the torch to be left unattended.

Question 31Health, Safety and Welfare in Roof Felting Work

Which of the following is an appropriate way to control the risk from fumes when applying solvent-based felt adhesive in a confined roof space?

  1. Provide mechanical ventilation and restrict the time spent in the space Correct answer.
  2. Increase the rate of adhesive application to finish sooner
  3. Issue dust masks to all workers in the space
  4. Rely on opening a single small hatch for the whole task

Explanation

Solvent vapours build up in confined spaces, so forced ventilation plus limiting exposure time controls the risk. A small hatch gives inadequate airflow, dust masks do not filter solvent vapour, and working faster increases vapour release.

Question 32Health, Safety and Welfare in Roof Felting Work

What is the key reason for maintaining a clear exclusion zone beneath a roof felting task?

  1. To protect people below from falling tools, materials, and hot bitumen Correct answer.
  2. To give the roofers more space to store their equipment
  3. To allow vehicles to move faster through the area
  4. To comply with parking regulations on site

Explanation

Objects and hot material can fall from the roof, so people below must be kept out of the drop zone. The zone is about protecting those beneath, not about convenience, parking, or traffic flow.

Question 33Health, Safety and Welfare in Roof Felting Work

A roofer is about to start work on a roof in strong gusting wind. What is the most appropriate action?

  1. Tie the felt rolls down and carry on regardless
  2. Continue but work only on the leeward side of the roof
  3. Ask a colleague to hold the rolls while working
  4. Assess the conditions and postpone the work if it cannot be done safely Correct answer.

Explanation

Wind can destabilise workers and blow materials, and it affects the safe use of torches and sheets. The task should be reassessed and postponed if safe working cannot be assured.

Question 34Health, Safety and Welfare in Roof Felting Work

Which of the following best describes the role of a competent person when inspecting access equipment before use?

  1. Someone with the training, knowledge, and experience to identify defects and decide if the equipment is safe Correct answer.
  2. The person who purchased the equipment
  3. The site visitor who signs the register
  4. Any worker who happens to be nearby at the time

Explanation

Inspection requires competence, meaning the person has the training, knowledge, and experience to recognise defects and judge safety. Proximity, purchasing history, or visitor status do not confer competence.

Question 35Health, Safety and Welfare in Roof Felting Work

Why should an access ladder be extended above the landing point when used to reach a roof?

  1. To allow two people to climb at once
  2. To provide a secure handhold when stepping onto the roof Correct answer.
  3. To make the ladder easier to carry
  4. To reduce the cost of the ladder

Explanation

Extending the ladder above the landing gives a handhold for the user to grip while stepping on or off, improving stability. It is not about carrying, cost, or multi-person use.

Question 36Health, Safety and Welfare in Roof Felting Work

A worker notices the flame on a gas torch is unstable and the hose shows signs of wear. What should they do?

  1. Adjust the regulator and continue the task
  2. Stop using the equipment and report it for inspection and repair Correct answer.
  3. Tape over the worn hose and keep working
  4. Use the torch at a lower setting to reduce the problem

Explanation

An unstable flame and a worn hose indicate a defective gas system that could lead to fire or explosion. The equipment must be taken out of use and reported for competent inspection.

Question 37Health, Safety and Welfare in Roof Felting Work

Which of the following is the correct way to dispose of waste solvent-soaked rags after a felting task?

  1. Place them in a lidded metal container and remove them from the work area Correct answer.
  2. Leave them in a heap on the roof overnight
  3. Hang them on the scaffold to dry
  4. Throw them in the general site skip

Explanation

Solvent-soaked rags can self-heat and ignite, so they must be kept in a lidded metal container and removed promptly. Leaving them in a heap, in a skip, or on the scaffold creates a fire risk.

Question 38Health, Safety and Welfare in Roof Felting Work

Which of the following best describes the purpose of a rescue plan for work at height?

  1. To allow workers to be left suspended until the end of the shift
  2. To satisfy the client's insurance policy only
  3. To ensure a fallen worker can be recovered quickly before suspension can cause harm Correct answer.
  4. To replace the need for fall-arrest equipment

Explanation

Suspension in a harness can cause serious injury within a short time, so a rescue plan must ensure prompt recovery. It does not replace fall-arrest equipment and is not merely a paperwork exercise.

Question 39Health, Safety and Welfare in Roof Felting Work

Which of the following is the most appropriate way to protect workers from the sun during prolonged roof felting in hot weather?

  1. Require workers to remove shirts to stay cool
  2. Restrict drinking water to reduce toilet breaks
  3. Provide shade, sunscreen, and scheduled breaks with water Correct answer.
  4. Encourage workers to skip breaks to finish early

Explanation

Sun exposure and heat stress are controlled with shade, sunscreen, hydration, and rest breaks. Removing clothing increases exposure, and skipping breaks or restricting water worsens heat stress.

Question 40Health, Safety and Welfare in Roof Felting Work

A worker is asked to work alone applying hot bitumen on a remote roof section. Which consideration is most important before agreeing?

  1. Whether the weather forecast is for dry conditions
  2. Whether arrangements exist for someone to raise the alarm and assist if the worker is injured Correct answer.
  3. Whether the roof section is large enough to justify solo work
  4. Whether the worker prefers to work alone

Explanation

Lone working with a burn and fire risk requires reliable arrangements for emergency communication and assistance. Preference, roof size, and dry weather do not address the ability to summon help.

Question 41Roof Felting Materials, Components and Specifications

Which British Standard is most commonly specified for reinforced bitumen membranes used in roof felting?

  1. BS EN 490
  2. BS 8000-6
  3. BS 5534
  4. BS EN 13707 Correct answer.

Explanation

BS EN 13707 is the harmonised European standard covering reinforced bitumen sheets for roof waterproofing. BS 5534 deals with slating and tiling, BS EN 490 with concrete roofing tiles, and BS 8000-6 with workmanship on slated and tiled roofs.

Question 42Roof Felting Materials, Components and Specifications

In roof felting terminology, what does the abbreviation SBS refer to?

  1. Surface-bonded sheathing
  2. Styrene-butadiene-styrene modified bitumen Correct answer.
  3. Standard base sheet
  4. Single-bonded substrate

Explanation

SBS is a thermoplastic elastomer added to bitumen to improve flexibility at low temperatures and elasticity. It is one of the two common polymer modifiers, the other being APP (atactic polypropylene).

Question 43Roof Felting Materials, Components and Specifications

Which polymer modifier gives a bitumen membrane its improved resistance to high in-service temperatures and is typically torch-applied?

  1. APP Correct answer.
  2. EPDM
  3. SBS
  4. PVC

Explanation

APP (atactic polypropylene) modified bitumen has a higher softening point and is well suited to torch application. SBS is more flexible at low temperature but softens at lower temperatures.

Question 44Roof Felting Materials, Components and Specifications

A roof specification calls for a high-performance vapour control layer beneath warm-deck insulation. Which property is most important to verify when selecting the VCL?

  1. Its ultraviolet stability
  2. Its slip resistance when wet
  3. Its colour match to the finish
  4. Its water vapour resistance (Sd value) Correct answer.

Explanation

The function of a vapour control layer is to limit moisture vapour entering the construction, so its vapour resistance (expressed as an Sd value) is the key selection criterion. UV stability, slip resistance and colour are not primary performance requirements for a concealed VCL.

Question 45Roof Felting Materials, Components and Specifications

Which material is typically used as the reinforcement carrier in a high-tensile polyester-reinforced bitumen membrane?

  1. Woven glass cloth
  2. Kraft paper
  3. Spunbonded polyester mat Correct answer.
  4. Aluminium foil

Explanation

Polyester reinforcement, usually a spunbonded or needle-punched mat, gives high tensile strength and elongation. Glass cloth is used in some membranes but offers lower elongation, and foil and paper serve other functions.

Question 46Roof Felting Materials, Components and Specifications

What is the primary purpose of a mineral (slate) finish on a capsheet membrane?

  1. To increase the membrane's vapour resistance
  2. To improve adhesion to the substrate
  3. To protect the bitumen from ultraviolet degradation Correct answer.
  4. To reduce the membrane's weight

Explanation

Mineral surfacing shields the bitumen from UV light, which would otherwise embrittle and degrade it, and also improves slip resistance and appearance. It does not provide vapour resistance or reduce weight.

Question 47Roof Felting Materials, Components and Specifications

In a three-layer built-up felt roofing system, which sheet is laid first?

  1. The vapour control layer Correct answer.
  2. The mineral-surfaced top sheet
  3. The capsheet
  4. The underlayer

Explanation

The vapour control layer is installed directly onto the deck before any insulation or waterproofing layers. Underlayers and the capsheet follow above the insulation in a warm-roof build-up.

Question 48Roof Felting Materials, Components and Specifications

Which term describes a felt membrane that has a sand or talc finish on both faces for use as an underlayer?

  1. Torch-on capsheet
  2. Sanded underlayer Correct answer.
  3. Faced sheet
  4. Capsheet

Explanation

Sanded underlayers have a fine sand or talc finish to prevent the sheet sticking in the roll and to aid bonding. Capsheets are the mineral-surfaced top layer.

Question 49Roof Felting Materials, Components and Specifications

What is the main reason for specifying a root-resistant membrane on a green (sedum) roof?

  1. To increase the roof's thermal insulation
  2. To improve rainwater drainage
  3. To provide a slip-resistant walking surface
  4. To prevent plant roots penetrating the waterproofing Correct answer.

Explanation

Root-resistant membranes contain additives or a metallic foil that deter rhizome penetration, protecting the waterproofing. Insulation, slip resistance and drainage are provided by other components.

Question 50Roof Felting Materials, Components and Specifications

Which property of a bitumen membrane is measured by the 'softening point' test?

  1. The water vapour transmission rate
  2. The tensile strength at 23 °C
  3. The temperature at which the membrane becomes brittle
  4. The temperature at which the bitumen begins to flow under defined conditions Correct answer.

Explanation

Softening point indicates the temperature at which the bitumen reaches a defined flow under standard test conditions and is used to assess heat resistance. Brittleness, tensile strength and vapour transmission are measured by different tests.