Stamped & Decorative Concrete SWMS

Stamped and decorative concrete installation combines wet concrete placement with colour hardener broadcast, powdered or liquid release agent application, pattern stamping using texturing mats and skins, post-cure acid or pressure washing, and solvent or water-based sealer application. The work spans driveways, patios, pool surrounds and feature slabs across residential and commercial sites. Under WHS Regulation 2025 section 291, this work is classified High Risk Construction Work because it involves repetitive manual handling of heavy stamps and full concrete loads, generation of respirable crystalline silica during colour broadcast and post-stamp washing of dried release powder, and use of hazardous chemicals including release agents and sealers containing volatile organic compounds. A Safe Work Method Statement is mandatory before work commences, must be developed in consultation with workers under WHS Act s47-49, and must be kept available for inspection for the duration of the work and retained for two years (or longer if a notifiable incident occurs).

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Specify pre-coloured integral concrete delivered from the batch plant in lieu of dry-shake colour broadcast wherever the architectural finish permits, removing the silica dust source entirely.
2. 2Elimination — Schedule pours outside peak heat (before 10am or after 3pm in summer) to remove heat stress exposure during the mandatory stamping window.
3. 3Substitution — Use liquid release agents in pump-up sprayers instead of powdered antique release where pattern depth allows, substituting away from airborne respirable powder.
4. 4Substitution — Replace solvent-based acrylic sealers with water-based polyurethane or hybrid sealers compliant with AS/NZS 4548 to reduce VOC exposure and flammability.
5. 5Engineering — Apply colour hardener using low-velocity broadcast techniques with on-tool LEV shrouds or wet misting at the surface to suppress respirable silica at the point of generation.
6. 6Engineering — Use mechanical stamp lifters, vacuum lifting tongs or two-person carry handles to reduce spinal compression loads below the SafeWork Australia WES lifting equation threshold.
7. 7Administrative — Conduct a documented pre-start toolbox using this SWMS, rotate workers off the broadcast and stamping task every 45 minutes, and maintain SDS register on site per WHS Reg 2025 s344.
8. 8Administrative — Establish a 2-metre exclusion zone around the active stamping line, signed in accordance with AS 1319, with sealer application restricted to ventilated areas only.
9. 9PPE — Provide P2 reusable half-face respirators (AS/NZS 1716) during colour broadcast, release application and post-wash; upgrade to organic-vapour cartridges during sealer application.
10. 10PPE — Issue chemical-resistant nitrile gauntlets, full-seal goggles to AS/NZS 1337.1, alkali-resistant gumboots, and long-sleeve cotton coveralls for all wet-concrete and acid-wash phases.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a Thursday morning pour of a 90m² stamped driveway at a two-storey residential build, the leading hand opens this SWMS at the 6:30am pre-start with a three-person crew and the concrete pump operator. Walking through the hazards register, the crew flags that today's forecast hits 34°C by 1pm — triggering the heat stress control to bring forward the pour to 7am and rotate the broadcast operator every 30 minutes instead of 45. The SWMS hazard line for respirable silica during colour broadcast prompts the apprentice to fit-check his P2 half-face respirator and confirms the LEV mister is charged. When the supervisor reviews the manual handling control, he assigns the two heaviest stamp mats to the vacuum lifter rather than two-person carry because the slab edge is against a retaining wall limiting footing. All four workers sign the SWMS sign-on register, noting their tickets and respirator fit-test dates. Mid-pour, the release powder application generates more visible dust than expected due to a wind shift; the leading hand stops work, references the SWMS review trigger clause, adds wet misting upwind, re-briefs the crew, and annotates the SWMS amendment log before resuming. The document stays in the site box, available for the WHS inspector who attends two days later during sealer application.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Crystalline Silica — National Strategy + CoP

Frequently asked questions