Water suppression (dust)
Water suppression feeds water to the cutting point so respirable dust binds and falls rather than going airborne, the first-line engineering control for silica tasks.
Ask Chalkline about this →Water suppression is a dust control that feeds water to the cutting or grinding point so that respirable dust is wetted, bound, and falls as slurry rather than becoming airborne. It is a first-line engineering control for silica tasks such as wet-cutting fibre cement, sawing brick, block or concrete, and grinding.
The mechanism is simple and effective: dust that never gets airborne cannot be breathed in. A continuous water feed at the blade or disc keeps the dust down at the source, which is far more reliable than trying to capture or filter it after it has dispersed. For many wet-capable tools (drop saws, brick saws, floor saws, core drills) water suppression is the manufacturer’s intended method and the expected control under the silica provisions.
A few practical points decide whether it actually works:
- The water has to reach the cut point at an adequate flow, not just dribble near it.
- It controls dust only while running wet, dry cutting “just for a second” defeats it.
- It produces slurry, which has to be managed (contained, cleaned up wet, not swept or left to dry into airborne dust again) and kept out of stormwater.
For a builder the rule is to use water suppression (or on-tool extraction) as the control for silica cutting, not respirators alone, because respiratory protection sits below engineering controls in the hierarchy. Keep the water feeding, manage the slurry wet, and treat dry cutting of silica materials as the thing you have specifically engineered out.
Also known as: Wet cutting, wet suppression, water-fed dust control.
Category: WHS / Dust control.
Related
See also
References
- Safe Work Australia: crystalline silica and silicosis (verified 2026-06-03)
Last updated: 2026-06-03. Verified: 2026-06-03. Quarterly review for currency.