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Top 10 High-Risk Silica Dust Tasks in Home Building & Renovation
Silica dust risk is easy to overlook because many of the tasks that create it are routine parts of building and renovating.
Cutting concrete. Drilling into brick. Removing tiles. Grinding masonry. Even cleaning up afterwards.
When materials containing crystalline silica are cut, drilled, ground, sanded or demolished, they can release extremely fine particles known as respirable crystalline silica (RCS). These particles can be breathed deep into the lungs and may cause serious long-term health problems.
For owner-builders and renovators, the important question isn't simply whether a job is big or small. It's whether the work could generate silica-containing dust — and whether that dust is being properly controlled.
Important: Silica requirements vary depending on the type of work, material and Australian state or territory. This article provides general awareness information and does not replace applicable WHS requirements, a risk assessment or professional safety advice.
1. Cutting concrete slabs, paths and pavers
Concrete commonly contains crystalline silica.
Cutting into a concrete slab, driveway, pathway or paver can generate significant amounts of airborne dust, particularly when power tools are used.
This might happen when installing new plumbing or electrical services, modifying a slab edge, repairing a pathway or cutting concrete during a renovation.
Safer approach: Use appropriate dust-control methods such as wet cutting or suitable on-tool dust extraction where required and appropriate for the task. Keep other people away from the work area.
2. Drilling into concrete, bricks or masonry
Drilling holes for anchors, fixings, plumbing, electrical services or other installations may seem like a relatively minor task.
However, drilling into concrete, brick and other masonry products can release fine silica-containing dust directly around the drill point.
Repeated drilling can increase the potential for exposure.
Safer approach: Use suitable on-tool extraction or other dust-control systems and avoid allowing dust to accumulate around the work area.
3. Grinding concrete edges or surfaces
Grinding can be particularly dusty because the tool removes material rapidly.
Concrete grinding may be used for surface preparation, levelling, removing coatings, smoothing edges or preparing an area for another building product.
Without effective controls, fine dust can quickly spread beyond the immediate work area.
Safer approach: Use equipment designed with effective dust controls, such as suitable extraction or suppression systems, and isolate the work area where necessary.
4. Chasing walls for electrical or plumbing services
Wall chasing involves cutting grooves into concrete, brick, block or other masonry so electrical cables, pipes and other services can be installed.
It is particularly common during renovations.
Because wall chasing may occur inside enclosed rooms, airborne dust can accumulate quickly if it isn't effectively controlled.
Safer approach: Plan service routes before cutting, use appropriate dust suppression or extraction, restrict access to the work area and ensure suitable ventilation where appropriate.
5. Removing tiles, grout and tile adhesive
Bathroom, kitchen and laundry renovations frequently involve removing existing tiles.
The tiles themselves, along with grout, mortar, adhesives, screeds and other surrounding materials, may contain crystalline silica.
Breaking, grinding, scraping or mechanically removing these materials can create airborne dust.
Safer approach: Use controlled removal methods, minimise unnecessary breakage and use appropriate dust-control and clean-up equipment, such as a suitable HEPA-filtered vacuum where required.
6. Cutting bricks, blocks and masonry products
Brick and block cutting is common when building or renovating walls, creating openings, making adjustments or completing repairs.
Even a relatively short cutting task can generate substantial visible and invisible dust when suitable controls aren't used.
Safer approach: Use appropriate wet-cutting or dust-extraction methods for the equipment and material being worked on, and keep unnecessary people away from the cutting area.
7. Demolishing brickwork, mortar or render
Small demolition jobs can easily be underestimated.
Removing an old brick wall, fireplace, masonry structure, render or mortar may disturb several silica-containing materials at the same time.
Breaking materials with power tools can generate significant amounts of airborne dust.
Safer approach: Use appropriate dust suppression and controlled demolition techniques, restrict access to the area and prevent dust from spreading into other parts of the property.
8. Sanding or preparing masonry surfaces
Surface preparation might involve sanding, grinding or abrading concrete, render, mortar or other masonry materials before repairs, waterproofing, painting or finishing.
Because these processes remove very small particles from the surface, they can generate fine airborne dust that is easily inhaled.
Safer approach: Choose lower-dust preparation methods where reasonably practicable and use appropriate extraction, suppression and respiratory protective equipment where required as part of the control measures.
9. Working with existing engineered stone
Existing engineered stone products can contain high levels of crystalline silica.
Cutting, drilling, grinding, polishing or otherwise disturbing previously installed engineered stone can generate dangerous respirable crystalline silica dust.
Australia has prohibited the manufacture, supply, processing and installation of engineered stone benchtops, panels and slabs, with specific WHS requirements applying to certain work involving previously installed engineered stone.
This means an existing engineered stone benchtop should not be treated like an ordinary DIY material that can simply be cut or modified during a renovation.
Safer approach: Before disturbing existing engineered stone, check the current WHS requirements that apply in your state or territory. Work may require appropriately trained or qualified people, specific control measures and other regulatory requirements.
10. Dry sweeping or cleaning dusty work areas
Silica exposure doesn't necessarily stop when the power tool is switched off.
Dust that has settled on floors, benches, equipment and other surfaces can become airborne again during clean-up.
Dry sweeping or using compressed air can redistribute fine dust through the work area and create another opportunity for exposure.
Safer approach: Avoid dry sweeping silica-containing dust. Use appropriate dust-control cleaning methods, such as a suitable HEPA-filtered vacuum or wet clean-up methods, where required and appropriate.
Why Are These Tasks High Risk?
Although the tasks are different, they have one important thing in common: they disturb materials that may contain crystalline silica and can generate respirable dust.
The smallest particles may be difficult or impossible to see.
Silica dust exposure can become more concerning when work is:
Performed without effective dust controls.
Undertaken in enclosed or poorly ventilated areas.
Performed repeatedly or for extended periods.
Completed using high-powered cutting or grinding equipment.
Undertaken by several people in the same area.
Followed by poor clean-up practices that put settled dust back into the air.
The absence of a large visible dust cloud does not necessarily mean the task is safe.
What Should Owner-Builders Do Before Work Starts?
Before starting work that could disturb concrete, brick, mortar, tiles, masonry, stone or similar building materials, consider:
What material am I working with?
Could it contain crystalline silica?
Can the work be completed using a method that creates less dust?
Can the dust be controlled at its source?
Does the work area need to be isolated?
How will the area be cleaned afterwards?
Do the people doing the work understand the silica hazard?
Is appropriate respiratory protective equipment required?
Are there specific WHS requirements that apply to this task?
If you cannot identify the material, understand the silica risk and determine appropriate controls before work begins, stop and get further advice before starting the task.
Don't Rely on a Dust Mask Alone
One of the most important things for owner-builders to understand is that personal protective equipment is not a substitute for controlling silica dust at its source.
Simply putting on a mask before cutting concrete does not automatically make the work safe.
Effective silica risk management may involve a combination of eliminating or changing the task, dust suppression, extraction, isolation, appropriate work practices, clean-up procedures and correctly selected and fitted respiratory protective equipment.
Practical Takeaway
Some of the most common jobs on a residential building or renovation site can create silica dust.
Cutting a paver, drilling into a concrete wall, renovating a bathroom or grinding a slab might seem routine, but the material being disturbed and the way the work is performed matter.
Recognising the hazard before the tool is switched on gives you an opportunity to plan the work and put appropriate controls in place.
Learn More About Silica Dust Safety
Want to better understand where silica dust may be found and how exposure can occur?
The Owner Builder Institute Silica Awareness Course provides practical, plain-English guidance for owner-builders, renovators and people who may work around silica-containing building materials.
$49 • 100% online • Instant access • Certificate of Completion issued on completion
Frequently Asked Questions
Are small silica dust jobs still risky?
Yes. A task doesn't have to be large to generate respirable crystalline silica dust. Short-duration cutting, drilling or grinding tasks can still create exposure, particularly when effective controls aren't used.
Is wet cutting always required?
Not necessarily. The appropriate control method depends on the material, equipment, task and applicable WHS requirements. Wet methods can be an effective way of reducing dust for some tasks, while suitable on-tool extraction or other controls may be appropriate in other situations.
Can I just wear a mask when cutting concrete?
Respiratory protective equipment may form part of the required controls, but it shouldn't be relied upon as the only way of managing silica dust. Controlling dust at its source should be a priority.
Does tile removal create silica dust?
It can. Tiles, grout, mortar, adhesives, screeds and other materials disturbed during tile removal may contain crystalline silica. Cutting, grinding, breaking or mechanically removing these materials can generate dust.
Is engineered stone still allowed in Australia?
Australia has prohibited the manufacture, supply, processing and installation of engineered stone benchtops, panels and slabs. Specific requirements apply to certain work involving engineered stone that was installed before the prohibition, so current WHS requirements should be checked before existing engineered stone is disturbed.
What is one of the biggest silica mistakes on a renovation site?
Assuming that a job is too small or quick to require proper dust controls. Silica exposure isn't limited to major construction projects — common renovation and maintenance tasks can also generate respirable crystalline silica dust.
Related Resources
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