How do I clean fine silica dust from surfaces after concrete work in my Ottawa home?

Fine dust from concrete grinding, cutting, or finishing is one of the more persistent types of construction dust, and because it can contain crystalline silica, it can be hazardous to breathe. The particles are very small and can stay airborne for a long time after the work is complete. The key to removing it is using the right equipment, avoiding anything that puts dust back into the air, and working methodically from top to bottom through every room affected by the concrete work. Keep children and anyone with breathing problems out of the area until it is clean.

Start by running an air scrubber with HEPA filtration in the affected area for a while before you begin wiping surfaces. It captures fine airborne particles that would otherwise resettle on surfaces you have already cleaned. In Ottawa's dry winter heating season, fine dust can hang in the air longer, so plan on a longer run time. Keep the air scrubber running while you clean as well.

Then begin surface cleaning with a HEPA vacuum. A standard household vacuum is the wrong tool here and can make things worse by blowing fine particles back into the air through its exhaust. Vacuum all hard surfaces including walls, windowsills, light fixtures, shelving, and floors. Pay special attention to HVAC registers and returns, as fine dust can get into the ductwork, especially in winter when a forced-air system is running.

After vacuuming, damp-wipe all hard surfaces using microfibre cloths with warm water and a small amount of pH-neutral cleaner. Avoid sweeping or dry dusting at any point, as this simply redistributes the fine particles. For textured surfaces like stippled ceilings or rough-finished walls, use a damp microfibre mop head attached to an extension pole. Rinse cloths frequently and replace them when they become loaded with dust. Expect to need more than one complete damp-wipe pass across all surfaces before the dusty film is gone.

Floors often take extra effort, since concrete dust mixes with mud tracked in from outside into a gritty film. If the concrete work was extensive, such as a full basement slab or major foundation repair, a post-construction cleaning crew with commercial HEPA equipment and air scrubbers is usually the better choice. Quotes for this kind of cleanup in a basement can run roughly $500 to $1,200 depending on the area affected — ask for itemized written quotes, and ask each company how they control dust. You can browse independent cleaning companies through the Ottawa Construction Network directory at justynrookcontracting.com.

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Looking for experienced contractors? The Ottawa Construction Network connects homeowners with qualified professionals:

• 613Bins
• JC Carpentry
• Humble Homes - property maintenance
• Somar Contracting Inc.
• Estra Design