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CPC31020 Solid Plastering study materials
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CPC31020 Solid Plastering practice questions

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Question 1Workplace health, safety and environmental practice

Under typical Australian work health and safety law, what is the primary duty of a person conducting a business or undertaking (PCBU) on a plastering site?

  1. Guarantee that no worker is ever injured regardless of cost or circumstances
  2. Ensure the health and safety of workers and others affected by the work so far as reasonably practicable Correct answer.
  3. Transfer all safety responsibility to each individual worker through signed agreements
  4. Provide safety equipment only after a worker requests it in writing

Explanation

The primary duty requires a PCBU to ensure health and safety so far as is reasonably practicable, which balances likelihood and severity of harm against cost and available controls. It cannot be delegated away by agreement, and duties extend to visitors and others affected by the work.

Question 2Workplace health, safety and environmental practice

A plasterer is about to mix mortar. Which control most effectively reduces the risk of silica dust inhalation at the source?

  1. Opening a window far from the mixing area
  2. Wearing a disposable dust mask while mixing
  3. Working faster to reduce total exposure time
  4. Wetting the mix and using dust-suppressed materials or extraction Correct answer.

Explanation

The hierarchy of controls places elimination and substitution above personal protective equipment. Wetting materials and using dust-suppressed products or local extraction stop dust becoming airborne, whereas a mask only protects the wearer if correctly fitted.

Question 3Workplace health, safety and environmental practice

What does the term 'hierarchy of controls' mean in risk management?

  1. A register of plant and equipment on site
  2. An ordered list of control measures from most to least effective Correct answer.
  3. A schedule of fines for safety breaches
  4. A ranking of workers by experience level

Explanation

The hierarchy of controls ranks measures from elimination and substitution through engineering and administrative controls to PPE. Higher-order controls are preferred because they protect everyone and rely less on human behaviour.

Question 4Workplace health, safety and environmental practice

Which item of personal protective equipment is essential when handling lime-based plaster with bare-skin contact risk?

  1. High-visibility vest
  2. Hearing protection
  3. Chemical-resistant gloves Correct answer.
  4. Steel-capped gumboots

Explanation

Lime and cement-based products are alkaline and can cause irritant or allergic contact dermatitis, so chemical-resistant gloves protect the hands. Other listed items address foot impact, noise or visibility, which are different hazards.

Question 5Workplace health, safety and environmental practice

What is the correct action when a worker discovers a damaged electrical lead on a plaster mixer?

  1. Tape the damage and continue until lunchtime
  2. Continue using it but keep hands dry
  3. Isolate the equipment from power and tag it out of service Correct answer.
  4. Swap the lead with any spare lead found nearby

Explanation

Damaged leads must be taken out of service immediately by disconnecting power and applying a danger tag so others do not use it. Repairs must be done by a competent person, and makeshift fixes are not acceptable.

Question 6Workplace health, safety and environmental practice

Which document should be consulted to understand the safe work procedure for erecting mobile scaffolding?

  1. The payroll timesheet
  2. The safe work method statement or manufacturer instructions Correct answer.
  3. The client's colour scheme schedule
  4. The site delivery docket

Explanation

Safe work method statements and manufacturer instructions set out the sequence, stability requirements and inspections for scaffolding. They are the authoritative source for the safe procedure on site.

Question 7Workplace health, safety and environmental practice

Why should plasterboard offcuts and packaging be separated on site?

  1. To increase the weight of the waste load
  2. To make the site look tidy for the client only
  3. To reduce waste to landfill and enable recycling of gypsum and cardboard Correct answer.
  4. To avoid paying wages to labourers

Explanation

Separating gypsum offcuts and cardboard allows materials to be recycled and reduces landfill volume. Environmental duty of care requires waste to be managed responsibly, and source separation improves recovery rates.

Question 8Workplace health, safety and environmental practice

What is the main purpose of a site induction before starting plastering work?

  1. To record the worker's tax file number
  2. To allocate parking spaces
  3. To assess the worker's plastering skill level
  4. To inform workers of site-specific hazards, rules and emergency arrangements Correct answer.

Explanation

A site induction communicates site-specific hazards, emergency procedures, amenities and rules so workers can work safely. It is a legal and practical requirement before commencing work on a new site.

Question 9Workplace health, safety and environmental practice

A plasterer must work at height on a trestle near an unprotected edge. Which control should be considered first?

  1. Provide a fall-arrest harness as the first choice
  2. Reduce the number of workers on the task
  3. Eliminate the need to work near the edge by relocating or using edge protection Correct answer.
  4. Instruct workers to be careful

Explanation

The hierarchy of controls favours eliminating or engineering out the fall risk, such as edge protection or relocating the task, before relying on PPE. Fall-arrest systems are a last line of defence because they only limit injury after a fall.

Question 10Workplace health, safety and environmental practice

What does a safety data sheet (SDS) provide for a plaster or render product?

  1. The building code compliance certificate
  2. The names of workers trained to use it
  3. The retail price and discount structure
  4. Hazard information, safe handling, first aid and disposal requirements Correct answer.

Explanation

An SDS gives essential hazard, handling, storage, first aid and disposal information so workers can manage chemical risks. It must be readily accessible to workers who use the product.

Question 11Workplace health, safety and environmental practice

A worker develops red, itchy skin after repeated contact with wet mortar. What is the most likely cause and appropriate response?

  1. Contact dermatitis from alkaline materials; report it, cover affected skin and review controls Correct answer.
  2. Heat rash; ignore it because it resolves on its own
  3. Sunburn; apply sunscreen and continue
  4. An allergic reaction to gloves; stop wearing any gloves

Explanation

Prolonged wet contact with cement and lime causes irritant or allergic contact dermatitis. The worker should report it, protect and clean the skin, and controls such as gloves and barrier creams should be reviewed.

Question 12Workplace health, safety and environmental practice

Which practice best controls manual handling risk when lifting plasterboard sheets?

  1. Carrying sheets above head height
  2. Lifting alone to save time
  3. Using mechanical aids or two-person lifts and planning the route Correct answer.
  4. Twisting while lifting to move faster

Explanation

Manual handling risks are reduced by mechanical aids, team lifting and planning the path before lifting. Avoiding twisting and keeping loads close to the body further reduce strain on the back.

Question 13Workplace health, safety and environmental practice

Why is it important to control the amount of water used when cleaning tools containing cement-based plaster?

  1. To prevent cement-laden water entering stormwater drains and waterways Correct answer.
  2. To reduce the noise of cleaning
  3. To save on the cost of detergent
  4. To make the tools dry faster

Explanation

Cement-laden washout water is alkaline and can harm aquatic life, so it must be contained and disposed of appropriately rather than entering stormwater. Washout buckets or settlement areas keep it out of drains.

Question 14Workplace health, safety and environmental practice

What is the correct way to store compressed gas cylinders used for plastering equipment on site?

  1. Store upright, secured, away from ignition sources and with valves closed Correct answer.
  2. Lay them horizontally in a walkway
  3. Store them loose in the back of a ute
  4. Keep them next to the refuelling point

Explanation

Cylinders should be kept upright and secured so they cannot fall, with valves closed when not in use and away from heat or ignition. This prevents leaks, impact damage and involvement in fire.

Question 15Workplace health, safety and environmental practice

What should a worker do first on hearing the site evacuation alarm?

  1. Stop work and proceed to the designated assembly area via the evacuation route Correct answer.
  2. Wait for a supervisor to confirm the alarm is real
  3. Collect all personal tools and equipment
  4. Finish the current mix before leaving

Explanation

On hearing an alarm, workers should stop work immediately and follow the evacuation route to the assembly area so they can be accounted for. Delaying to finish tasks or gather tools puts people at risk.

Question 16Workplace health, safety and environmental practice

Which measure best reduces noise exposure when using a powered mixer for extended periods?

  1. Removing the mixer's muffler for more power
  2. Turning up music to mask the noise
  3. Working alone to reduce conversation
  4. Using a quieter or better-maintained mixer and rotating tasks Correct answer.

Explanation

Noise exposure is best reduced at the source through quieter, well-maintained equipment and by limiting exposure duration through task rotation. Hearing protection is used when other controls cannot reduce noise sufficiently.

Question 17Workplace health, safety and environmental practice

A worker notices a crack in the platform of a mobile scaffold being used for ceiling work. What is the appropriate response?

  1. Continue but limit the number of people on the platform
  2. Stop use, barricade or tag the scaffold and report it for repair Correct answer.
  3. Move the scaffold to a different area and keep using it
  4. Place a board over the crack and continue

Explanation

A cracked platform compromises the scaffold's strength, so it must be taken out of service, isolated and reported for competent repair. Only after inspection and repair should it return to use.

Question 18Workplace health, safety and environmental practice

How should a plasterer manage the risk of slips from wet floors and dropped mortar in a work area?

  1. Ask visitors to walk carefully
  2. Ignore small spills until the end of the shift
  3. Cover wet floors with cardboard
  4. Clean up spills promptly and use signage or barriers for wet areas Correct answer.

Explanation

Prompt cleaning of spills and clear warning of wet areas reduces slip risk for everyone on site. Good housekeeping is a basic administrative control that should be maintained throughout the shift.

Question 19Workplace health, safety and environmental practice

Which of the following best describes a 'notifiable incident' under work health and safety law?

  1. A dispute over lunch breaks
  2. Any minor cut that requires a bandage
  3. A near miss involving no injury
  4. A death, serious injury or dangerous incident that must be reported to the regulator Correct answer.

Explanation

Notifiable incidents include deaths, serious injuries or illnesses and dangerous incidents such as structural collapses or electrical shocks. The regulator must be notified immediately, and the site may need to be preserved.

Question 20Workplace health, safety and environmental practice

Which environmental control is most appropriate for disposing of waste plasterboard containing gypsum?

  1. Send it to a licensed facility that accepts gypsum or arrange recycling Correct answer.
  2. Wash it into the stormwater drain
  3. Burn it in a site drum
  4. Bury it on site in a back corner

Explanation

Gypsum waste must go to a licensed facility or a recycling stream because it can generate harmful gases in landfill and contaminate waterways. On-site burial, burning or washing to drains breaches environmental obligations.

Question 21Workplace health, safety and environmental practice

A plasterer is using a solvent-based sealer in a small enclosed room. Which combination of controls is most appropriate?

  1. Close all doors and rely on a dust mask
  2. Wear only safety glasses
  3. Open one small window and work quickly
  4. Use local exhaust ventilation and forced general ventilation, plus suitable respiratory protection Correct answer.

Explanation

Solvent vapours accumulate in enclosed spaces, so local extraction and general ventilation are needed to remove them at source, supported by appropriate respiratory protection. Confined spaces also require monitoring and emergency planning.

Question 22Workplace health, safety and environmental practice

Why must a risk assessment for a plastering task be reviewed after a change in work methods?

  1. Because new hazards or changed exposure levels may require different controls Correct answer.
  2. Because the original assessment is automatically invalid after one month
  3. Because workers prefer more paperwork
  4. Because the regulator requires a new assessment for every shift

Explanation

Risk assessments are living documents; a change in methods, materials or equipment can introduce new hazards or alter exposure, so controls must be re-evaluated. Review ensures the assessment remains relevant to the actual work.

Question 23Workplace health, safety and environmental practice

A worker is directed to work on a roof edge without edge protection and is told to 'just be careful'. How should the worker respond?

  1. Use a harness without checking anchor points
  2. Do the task quickly to minimise exposure time
  3. Refuse the unsafe task, report it and request suitable fall protection Correct answer.
  4. Comply because a supervisor gave the instruction

Explanation

Workers have the right to refuse work they reasonably believe is unsafe and must not be directed to accept uncontrolled fall risks. The hazard should be reported and work should proceed only with suitable edge protection or a compliant fall-arrest system with verified anchors.

Question 24Workplace health, safety and environmental practice

Which factor most strongly determines the level of respiratory protection required when sanding joint compound in a poorly ventilated room?

  1. The brand of sandpaper used
  2. The number of workers in the room
  3. The measured airborne dust concentration and duration of exposure Correct answer.
  4. The colour of the joint compound

Explanation

Respiratory protection selection depends on the airborne contaminant concentration relative to exposure standards and the time spent exposed. Measurement and exposure duration drive the required protection factor, supported by ventilation controls.

Question 25Workplace health, safety and environmental practice

A site has a fuel-powered generator running in a partially enclosed basement where plasterers are working. What is the primary risk and the best control?

  1. Carbon monoxide build-up; relocate the generator outdoors and ventilate the space Correct answer.
  2. Noise; provide earplugs and continue
  3. Fuel smell; use air freshener
  4. Vibration; mount the generator on rubber

Explanation

Petrol or diesel generators release carbon monoxide, which is odourless and can be fatal in enclosed spaces. The generator should be located outdoors with exhaust directed away, and the space ventilated and monitored before work continues.

Question 26Workplace health, safety and environmental practice

Which type of footwear is most appropriate for a plasterer working with wet mortar and render on a construction site?

  1. Leather dress shoes with smooth soles
  2. Non-slip safety boots with steel toe caps Correct answer.
  3. Rubber-soled sandals with open toes
  4. Lightweight canvas sneakers

Explanation

Plastering involves wet, slippery floors plus heavy bags and tools that can fall on the feet, so footwear must combine slip resistance with toe protection. Safety boots with non-slip soles and steel toe caps meet both needs. Open or thin-soled footwear leaves the foot exposed to impact and chemical contact.

Question 27Workplace health, safety and environmental practice

A plasterer needs to reach a high ceiling and the only access is a single ladder that must be moved repeatedly. Which approach best manages the fall risk?

  1. Ask a co-worker to hold the ladder steady while working
  2. Lean the ladder against a plasterboard sheet for support
  3. Stand on the top two rungs to gain extra height
  4. Use a mobile scaffold or podium platform instead of the ladder Correct answer.

Explanation

Ladders are intended for short-duration access, not as a work platform for sustained overhead tasks. Where work at height will continue for some time or requires both hands, a stable platform such as a mobile scaffold or podium is the preferred control. This follows the hierarchy that favours eliminating or engineering out the fall risk over relying on behaviour.

Question 28Workplace health, safety and environmental practice

Which action best protects workers from silica dust when dry-sanding set joint compound in a room with no mechanical ventilation?

  1. Opening one window and relying on natural airflow
  2. Wetting the floor before starting to sand
  3. Using on-tool dust extraction with a suitable respirator Correct answer.
  4. Wearing a dust mask and working quickly to limit exposure time

Explanation

Fine dust from sanding joint compound can contain respirable crystalline silica, so the primary control is capturing dust at the source with on-tool extraction. A suitable respirator is then worn as a secondary control to cover residual airborne dust. Natural ventilation and speed of work do not reliably reduce exposure to a safe level.

Question 29Workplace health, safety and environmental practice

What is the primary reason for reporting a near miss, such as a trestle board tipping over without injuring anyone, to the supervisor?

  1. So the client can be billed for damaged equipment
  2. So the incident can be excluded from site records
  3. So the worker can be formally disciplined for unsafe behaviour
  4. So the hazard can be investigated and corrected before someone is hurt Correct answer.

Explanation

A near miss is a warning that a hazard exists and that the existing controls have failed. Reporting it allows the cause to be investigated and fixed before the same event causes an injury. Disciplining workers or hiding the event undermines the purpose of reporting and discourages future reports.

Question 30Workplace health, safety and environmental practice

A plastering crew is asked to apply a two-part epoxy coating in a sealed plant room. Which set of controls best reflects the hierarchy of control for this task?

  1. Shorten the job by having several workers apply the coating at once
  2. Rely on the product's odour to judge when to leave the room
  3. Substitute a low-emission product if possible, then ventilate and use PPE Correct answer.
  4. Issue respirators and gloves, then begin work immediately

Explanation

The hierarchy of control ranks eliminating or substituting the hazard above engineering and administrative controls, with PPE last. Choosing a lower-emission product where practicable, then adding mechanical ventilation and appropriate PPE, follows that order. Odour is an unreliable guide to exposure, and adding workers increases the number of people exposed.

Question 31Interpreting drawings, specifications and work instructions

On a architectural drawing set, which document is used to establish the overall dimensions and floor levels of a building before detailed setting out begins?

  1. The general arrangement drawing Correct answer.
  2. The site plan
  3. The specification schedule
  4. The reinforcement detail sheet

Explanation

General arrangement drawings show the overall layout, principal dimensions and floor levels of the building and are the primary reference for initial setting out. Site plans locate the building within the plot but do not normally carry internal room dimensions. Detail sheets deal with specific construction elements after the overall grid is established.

Question 32Interpreting drawings, specifications and work instructions

A drawing is marked 'NTS'. What does this tell the plasterer about the drawing?

  1. The drawing has not been surveyed
  2. The drawing is not to be signed
  3. The drawing is not to specification
  4. The drawing is not to scale Correct answer.

Explanation

NTS stands for 'not to scale', meaning dimensions must be read from the written figures rather than measured off the paper. Scaling from such a drawing would give unreliable results. Any dimensional query should be referred to the written dimensions or the designer.

Question 33Interpreting drawings, specifications and work instructions

A scale bar on a drawing indicates 1:50. A wall measures 80 mm on the drawing. What is the real length of the wall?

  1. 4.0 m Correct answer.
  2. 400 m
  3. 40 m
  4. 0.4 m

Explanation

At 1:50, one unit on the drawing represents fifty units in reality, so 80 mm multiplied by 50 gives 4000 mm, which is 4.0 m. Converting millimetres to metres requires dividing by 1000 after scaling. Always confirm the stated scale before measuring.

Question 34Interpreting drawings, specifications and work instructions

In a specification, what is the purpose of a 'performance specification'?

  1. It names every proprietary product to be used
  2. It records the site inspection dates
  3. It lists only the labour rates for each trade
  4. It states the required outcome and lets the contractor select the method Correct answer.

Explanation

A performance specification sets out the required end result, such as a stated finish or durability, and leaves the means of achieving it to the contractor. This differs from a prescriptive specification, which names materials and methods. The plasterer must ensure the chosen system demonstrably meets the stated performance.

Question 35Interpreting drawings, specifications and work instructions

A drawing uses a dashed line across a wall opening. In standard drafting convention, what does a dashed line most commonly represent?

  1. A hidden or obscured feature Correct answer.
  2. A centre line of symmetry
  3. A demolition boundary
  4. A finished floor level

Explanation

Dashed lines conventionally show features that are hidden from the viewing plane, such as lintels or services above a ceiling. Centre lines are shown as long-short chain lines, and finished floor levels use a level symbol with an elevation figure. Reading line types correctly prevents misinterpreting concealed construction.

Question 36Interpreting drawings, specifications and work instructions

A work instruction states that backing coat thickness must be 11 mm plus or minus 3 mm. Which measured thickness complies?

  1. 16 mm
  2. 15 mm Correct answer.
  3. 8 mm
  4. 6 mm

Explanation

The tolerance band runs from 8 mm to 14 mm, so 15 mm is outside it and 16 mm is further outside. Only a value within the stated range complies. Measuring with a depth gauge at several points confirms compliance across the whole background.

Question 37Interpreting drawings, specifications and work instructions

A drawing legend shows a hatched triangle symbol next to a wall. What should the plasterer do first before starting work on that wall?

  1. Check the legend key and any related notes to identify the symbol Correct answer.
  2. Measure the hatch spacing to calculate the mix ratio
  3. Ignore the symbol because legends apply only to engineers
  4. Assume the hatch indicates a decorative finish and proceed

Explanation

Symbols carry meaning only through the drawing legend, so the legend key and associated notes must be consulted before work begins. Assuming a meaning risks installing the wrong system or damaging a protected element. Any ambiguity should be raised with the site supervisor before proceeding.

Question 38Interpreting drawings, specifications and work instructions

A specification clause requires a 'two-coat gypsum plaster finish to BS EN 13279'. What does this clause primarily control?

  1. The number of coats and the product standard Correct answer.
  2. The colour of the final decoration
  3. The curing time of the concrete background
  4. The position of electrical conduit

Explanation

The clause fixes both the application method, being two coats, and the product standard the plaster must meet. Compliance is demonstrated by using certified product and applying the stated number of coats. Colour and services are governed by other documents.

Question 39Interpreting drawings, specifications and work instructions

A plasterer finds a discrepancy between a dimensioned drawing and a written schedule for the same wall. What is the correct first action?

  1. Average the two dimensions and proceed
  2. Use the drawing because drawings always take precedence
  3. Stop and refer the discrepancy to the supervisor or designer Correct answer.
  4. Use the larger of the two dimensions

Explanation

Discrepancies must be resolved by the party responsible for the design before work continues, because guessing can create defects and contractual liability. Most contracts include a precedence clause, but the plasterer should not decide unilaterally. A written instruction resolves the conflict and protects all parties.

Question 40Interpreting drawings, specifications and work instructions

A drawing note reads 'form a 3 mm chamfer to all external angles'. What is the purpose of this instruction?

  1. To reduce chipping of the arris in service Correct answer.
  2. To speed up the setting of the plaster
  3. To provide a key for the finish coat
  4. To increase the thickness of the backing coat

Explanation

A small chamfer or rounded arris removes the sharp vulnerable edge, reducing the likelihood of chipping and damage during use. It is a durability and finish detail, not a setting or keying measure. The chamfer is formed while the plaster is still workable.

Question 41Interpreting drawings, specifications and work instructions

Which information source would a plasterer consult to confirm the required fire resistance period of a plastered wall?

  1. The door ironmongery schedule
  2. The finishes schedule
  3. The landscape plan
  4. The fire strategy or fire resistance schedule Correct answer.

Explanation

Fire resistance periods and the assemblies that achieve them are recorded in the fire strategy or fire resistance schedule. Plaster thickness and mix can be critical to the stated rating, so the correct document must be used. Finishes schedules deal with appearance rather than fire performance.

Question 42Interpreting drawings, specifications and work instructions

A specification states a plaster mix of 1:4:5 by volume, being cement, lime and sand. What does the middle figure represent?

  1. The water content
  2. The lime content Correct answer.
  3. The sand content
  4. The cement content

Explanation

In a three-part mix ratio the figures follow the order in which the materials are named, so the middle value is the lime. Volume ratios allow consistent batching on site using a gauge box. Water is added to achieve workability and is not part of the ratio.

Question 43Interpreting drawings, specifications and work instructions

A drawing shows a wall with a 'FFL +2.400' annotation. What does this indicate?

  1. The ceiling is 2.400 m wide
  2. The plaster is 2.400 mm thick
  3. The wall is 2.400 m long
  4. The finished floor level is 2.400 m above the datum Correct answer.

Explanation

FFL means finished floor level, and the figure gives its height above the project datum. This lets the plasterer set screed and skirting levels consistently across the building. Datum heights are always related to a fixed reference point.

Question 44Interpreting drawings, specifications and work instructions

A work instruction requires the plasterer to 'protect adjacent surfaces prior to commencement'. Which action best demonstrates compliance?

  1. Masking and covering adjacent finishes before mixing begins Correct answer.
  2. Working only in dry weather
  3. Asking the client to accept any overspill
  4. Wiping adjacent surfaces after the plaster has set

Explanation

Protection must be in place before work starts, so masking and covering adjacent finishes at the outset is the compliant action. Cleaning afterwards is remediation rather than protection. Documenting the protection also supports quality records.

Question 45Interpreting drawings, specifications and work instructions

A drawing schedule lists a room as having a 'moisture-resistant plasterboard background with skim finish'. Why is this information important to the plasterer?

  1. It confirms the room's fire rating
  2. It determines the correct background preparation and adhesive or fixing method Correct answer.
  3. It sets the labour rate for the room
  4. It specifies the paint colour

Explanation

Knowing the background type tells the plasterer how to prepare the surface and which adhesive, fixings or pre-treatment are suitable. Moisture-resistant boards may need specific joint treatment before skimming. Using the wrong preparation risks failure of the finish.

Question 46Interpreting drawings, specifications and work instructions

A set of drawings shows a section marker 'A-A' on the plan. What is the purpose of this marker?

  1. To show where the corresponding section drawing is cut Correct answer.
  2. To mark the position of a fire extinguisher
  3. To indicate the north direction
  4. To identify the drawing revision

Explanation

Section markers show the line along which a section is cut and the direction of view, linking the plan to the matching section drawing. This helps the plasterer understand construction build-ups at that location. Revision and north indicators use separate symbols.

Question 47Interpreting drawings, specifications and work instructions

A plasterer is asked to interpret a reflected ceiling plan to establish the height of a bulkhead. Which drawing type would best confirm the vertical build-up of that bulkhead?

  1. The floor plan
  2. The section drawing Correct answer.
  3. The site plan
  4. The reinforcement schedule

Explanation

Vertical build-ups and heights are best read from sections, which cut through the construction and show the relationship of ceiling, bulkhead and slab. Reflected ceiling plans show layout as viewed from below but not the vertical construction. The two documents are read together.

Question 48Interpreting drawings, specifications and work instructions

A specification uses the term 'nominal' when describing a plaster thickness. How should the plasterer interpret this?

  1. The thickness is a minimum with no upper limit
  2. The thickness is a target value subject to stated tolerances Correct answer.
  3. The thickness applies only to decorative work
  4. The thickness must be achieved exactly at every point

Explanation

Nominal means a stated working value that is subject to the tolerances given elsewhere in the specification. It is not an absolute dimension, nor an open-ended minimum. The plasterer should check the tolerance clause to know the acceptable range.

Question 49Interpreting drawings, specifications and work instructions

A drawing shows a movement joint running vertically through a large plastered wall. Why must the plasterer follow this detail precisely?

  1. To mark the boundary of a fire compartment
  2. To allow controlled movement and prevent random cracking Correct answer.
  3. To provide a fixing point for shelving
  4. To indicate where the wall will be demolished

Explanation

Movement joints accommodate thermal and structural movement in a controlled location, preventing random cracking across the finish. Omitting or misplacing the joint can lead to visible defects and callbacks. The joint detail also defines the bead or sealant required.

Question 50Interpreting drawings, specifications and work instructions

A contractor receives a drawing marked 'Rev C' and a specification marked 'Rev B'. The contract states the specification takes precedence for workmanship. How should the plasterer proceed where the two conflict on finish quality?

  1. Follow the drawing because it is the later revision letter
  2. Follow the specification because the contract gives it precedence on workmanship Correct answer.
  3. Stop work permanently until new documents are issued
  4. Apply the lower of the two standards to save time

Explanation

Where a contract sets out a precedence order, that order governs conflicts regardless of revision letters. The specification therefore controls workmanship quality in this case. The plasterer should record the decision and seek written confirmation where the conflict is material.