Key points to cover
- COSHH requires employers to assess, control, and monitor exposure to hazardous substances
- Always read the safety data sheet (SDS) before using any chemical product
- Common construction hazards: cement (dermatitis, burns), solvents, resins, wood dust, welding fumes, diesel exhaust fumes
- Use the hierarchy of controls: substitute with a less hazardous product, then engineer out the exposure, then use PPE as a last resort
- Health surveillance may be required for workers regularly exposed to certain substances
- COSHH assessments must be reviewed regularly and whenever the task or product changes
Do's and don'ts
Do
- Check the safety data sheet for every product you use
- Use on-tool dust extraction where provided
- Wash hands thoroughly after handling chemicals — especially cement
- Store chemicals in their original labelled containers
- Attend health surveillance appointments if required
Don't
- Never mix chemical products unless the SDS says it is safe
- Never decant chemicals into unmarked containers
- Never dry sweep dust — use a vacuum with an H-class filter or damp down
- Never ignore skin irritation or breathing problems — report them immediately
- Never use compressed air to clean off dust from clothing or surfaces
Questions to check understanding
Q1: What does COSHH stand for?
Show the answer
Control of Substances Hazardous to Health. The COSHH Regulations 2002 require employers to assess and control exposure to hazardous substances at work.
Q2: Where can you find information about the hazards of a chemical product?
Show the answer
The safety data sheet (SDS) provided by the manufacturer. It lists the hazards, safe handling precautions, first-aid measures, PPE requirements, and storage and disposal instructions.
Q3: What is the correct way to control dust on site?
Show the answer
Use on-tool extraction or local exhaust ventilation (LEV) to capture dust at source. If sweeping is needed, damp down first or use an H-class vacuum. Never dry sweep or use compressed air.
Q4: Why is wet cement dangerous to skin?
Show the answer
Wet cement is strongly alkaline (high pH) and can cause serious chemical burns and dermatitis. It can penetrate clothing and footwear. Always wear gloves and wash off any contact immediately.
This is general guidance for UK construction sites. Check it against your own risk assessment, method statement and the site before you deliver it.