Dry sweeping concrete dust and other building debris can produce high levels of dust. Avoid dry sweeping where possible because this can be high risk. This page tells you how to control the risk and why. You also need to be aware of the general information on construction dust.
Follow the Assess, Control and Review model. Pay particular attention to the following things:
Identify and assess: Dry sweeping concrete dust and other building debris can produce high levels of dust. The risk will depend on how much material you are removing and what it contains. It will be higher risk if it contains silica or wood dust. Anyone breathing in this dust cloud will be affected. You will be at particularly risk if you are dry brushing for longer periods in an enclosed space. Follow the control steps below.
Prevent: Think about limiting the risks before work starts by:
Control: Even if you minimise some of the dust this way, you may still need to do some clearing up. Control the risk by:
Supervise: Ensure controls are properly used and RPE is worn correctly. Anyone using tight fitting masks also needs to be clean-shaven and face-fit tested.
Maintain: Check the extraction unit is correctly working on at least a weakly basis. Change filters as recommended by the supplier.
Monitor: Decide if you need a health surveillance programme . This depends on the amount and type of dust people are breathing. You may need competent advice for this from an occupational health professional. See:
Clearing up may seem low risk. However, dry brushing can push large amounts of dust into the air. Watch the graph in the video clip below. This shows how much silica is created when dry brushing concrete dust. The Workplace Exposure Limit for silica is 0.1 mg/m3 when averaged over 8 hours. The work quickly produces high peak exposures of around 1-2 mg/m3. The dust lamp also shows how much of this fine respirable dust gets into the air. This will re-settle sometime later and the floor will have to be cleaned again.
Now watch the video below. The graph shows a dramatic drop in the amount of silica when using the correct extraction unit. The dust is also quickly removed and there is no resettling later on. Because of this, RPE would not normally be needed as well in this situation. It was used while filming as an example of good practice.