Product Overview

Summary: This Lime Plaster Application Safe Operating Procedure sets out a safe, consistent and WHS-compliant method for mixing, handling and applying lime-based plasters on Australian worksites. It helps control the risks of caustic burns, dust inhalation and manual handling injuries while lifting the quality and durability of heritage and contemporary finishes.

Lime plaster is widely used in heritage restoration and high‑performance building projects across Australia, but it brings specific health, safety and quality challenges that differ from modern gypsum or cement-based products. The caustic nature of lime, combined with fine airborne dust, wet work at height, and extended curing times, can expose workers to burns, eye injuries, respiratory issues, slips and falls, and rework if not managed correctly. This Safe Operating Procedure provides a clear, step‑by‑step framework to manage those risks while achieving consistent, high-quality finishes suited to Australian conditions.

The document guides your team through the entire lime plaster workflow: from site preparation and substrate assessment, to safe handling and mixing of lime products, controlled application techniques, curing and protection of finished surfaces, and final clean‑up and waste disposal. It embeds WHS best practice and Australian regulatory expectations into everyday tasks, so supervisors can demonstrate due diligence and workers know exactly what “safe and acceptable” looks like on site. By standardising the process, you reduce incidents, avoid costly defects such as delamination and cracking, and protect the long‑term performance of heritage and new-build projects alike.

Key Benefits

• Ensure safe handling of caustic lime products, reducing the risk of skin and eye burns on site.
• Reduce worker exposure to lime and silica-containing dusts through clear controls on mixing, cutting and clean‑up.
• Standardise application techniques to improve finish quality, adhesion and long‑term durability of lime plaster systems.
• Demonstrate compliance with Australian WHS legislation and relevant Codes of Practice for hazardous chemicals, construction work and manual tasks.
• Streamline training and onboarding for new plasterers and apprentices with a clear, repeatable method statement.

Who is this for?

• Plasterers
• Solid Plasterers and Renderers
• Heritage Restoration Tradespeople
• Site Supervisors
• Construction Project Managers
• WHS Advisors and Safety Officers
• Apprentice Plasterers
• Residential and Commercial Builders
• Maintenance Managers for Heritage Buildings

Hazards Addressed

• Exposure to caustic lime causing skin irritation and chemical burns
• Eye injuries from splashes of wet lime plaster or airborne dust
• Inhalation of respirable dusts (including lime and silica from substrates or aggregates)
• Manual handling injuries from lifting and carrying bags of lime, sand and mixed plaster
• Slips, trips and falls due to wet surfaces, plaster spills and site clutter
• Falls from height when applying plaster from scaffolds, platforms or ladders
• Musculoskeletal strain from repetitive trowelling and overhead work
• Noise exposure from mechanical mixers and associated equipment
• Environmental contamination from improper disposal of lime residues and wash‑water

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Terminology (Lime Types, Substrates, Mix Ratios)
• 3.0 Roles and Responsibilities
• 4.0 Applicable Legislation, Standards and Codes of Practice
• 5.0 Required Competencies, Training and Licensing
• 6.0 Tools, Plant and Materials Required
• 7.0 Personal Protective Equipment (PPE) Requirements
• 8.0 Pre‑Start Planning and Site Preparation
• 9.0 Hazard Identification and Risk Controls for Lime Plaster Work
• 10.0 Safe Handling, Storage and Transport of Lime and Aggregates
• 11.0 Safe Mixing Procedure for Lime Plaster (Manual and Mechanical Mixing)
• 12.0 Substrate Inspection, Preparation and Dampening
• 13.0 Application Procedure – Scratch, Brown and Finish Coats
• 14.0 Working at Height Requirements (Scaffolds, Platforms and Ladders)
• 15.0 Curing, Protection of Work and Environmental Controls
• 16.0 Housekeeping, Spill Management and Waste Disposal
• 17.0 Emergency Procedures (Eye Wash, Skin Contact, Inhalation, Spills)
• 18.0 Quality Control, Inspection and Acceptance Criteria
• 19.0 Maintenance of Equipment and Mixers
• 20.0 Training, Induction and Competency Assessment
• 21.0 Recordkeeping, Review and Continuous Improvement

Legislation & References

• Work Health and Safety Act 2011 (Cth) and corresponding state and territory WHS legislation
• Work Health and Safety Regulations 2011 (Cth) – Hazardous chemicals, manual tasks and construction work
• Safe Work Australia – Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace
• Safe Work Australia – Code of Practice: Managing the Risk of Falls in Housing Construction
• Safe Work Australia – Code of Practice: Hazardous Manual Tasks
• Safe Work Australia – Code of Practice: Managing Noise and Preventing Hearing Loss at Work
• AS/NZS 1715: Selection, use and maintenance of respiratory protective equipment
• AS/NZS 1716: Respiratory protective devices
• AS/NZS 1801: Occupational protective helmets
• AS/NZS 2161 series: Occupational protective gloves
• AS/NZS 2210 series: Occupational protective footwear
• AS/NZS 4501 series: Occupational protective clothing
• AS/NZS 1891 series: Industrial fall-arrest systems and devices (where work at height is involved)
• AS/NZS 1576 series: Scaffolding (where scaffolds are used for plaster application)