Workplace Health, Safety and Environmental Practice
Why this domain underpins everything else
Solid plastering carries risks that are easy to underestimate: silica dust from cutting and mixing, lime burns to skin and eyes, cement dermatitis, musculoskeletal strain from trowelling and lifting, and falls from trestles and scaffolds. Questions in this domain test whether you can link a hazard to a control, and whether you know the hierarchy of control rather than jumping straight to PPE.
Core concepts to know
- Hierarchy of control: eliminate, substitute, engineer, administrate, then PPE last. A question describing a dusty task expects extraction or wet methods before a respirator.
- Silica and dust: crystalline silica in sand, cement and plasterboard dust. Controls include on-tool extraction, pre-mixed or bagged product, wet sweeping, and RPE fitted and face-checked.
- Hazardous substances: cement is alkaline and causes burns and dermatitis; lime is caustic; retarders and bonding agents carry their own safety data. Read the SDS before use.
- Manual handling: plasterboard sheets, bagged plaster and mortar boards. Team lifting, mechanical aids, and keeping the load close are standard answers.
- Working at height: trestles, mobile towers, podiums. Never stand on the top platform of a trestle without guardrails; never bridge between trestles with a plank alone.
- Electrical and plant safety: 110 V site tools, RCD protection, isolating mixers before clearing drums.
- Environment: washout must not enter stormwater drains; contain slurry, dispose to settlement or licensed collection, and segregate waste.
Traps
Questions often offer a plausible PPE answer when an engineering control is better, or imply that a respirator makes dry sweeping acceptable. Another trap is confusing a hazard with a risk, or asking who is responsible - everyone on site has duties, not just the supervisor.
Worked rule of thumb
For any scenario, ask: can I stop the hazard existing? If not, can I keep it away from the worker? Only then ask what the worker wears. Applied to mixing plaster in a confined room: use a pre-blended product and on-tool extraction first, ventilate, rotate tasks, then RPE and eye protection as the final layer.