How do you clean construction dust after a renovation?
The fine grey film after a renovation will not come off the way household dust does. What you can do yourself with a vacuum and a bucket, what needs equipment, and the dust you should not touch at all.
Clean construction dust from the top of the room down, with a HEPA-filtered vacuum first and damp microfibre cloths second. Never dry sweep it or blow it with compressed air, which puts it back in the air. Change the furnace filter, wait a day for airborne dust to settle, then wipe again. Anything you suspect contains asbestos, leave alone.
Is construction dust a health risk?
Some of it can be, and it is worth knowing which. Ontario's Ministry of Labour guideline on silica on construction projects says silica is the primary component of many construction materials, and names concrete, concrete block, cement, mortar, brick, granite, slate and stone among them. Its health effects section says exposure happens through breathing small airborne particles, and that long-term inhalation may result in silicosis, a progressive scarring of the lungs, which can also lead to lung cancer.
That guideline is written for employers and workers on construction sites, not for someone cleaning a kitchen once. But its cleaning advice applies just as well at home. The measures and procedures section says compressed air or dry sweeping should be avoided when cleaning a work area, and recommends HEPA-filter vacuuming, wetting and damp wiping instead.
Asbestos is a separate question, and a more serious one in older houses. Health Canada's page on asbestos and your health says asbestos was mainly used for insulating buildings and homes before 1990, that fibres can be released by drilling, sawing and sanding, and that the advice is to avoid disturbing materials that may contain it and to hire a professional to test before renovating. If old plaster, ceiling texture, floor tiles or pipe insulation were cut or broken during your work and nobody tested them, stop. That is not a cleaning job, ours or yours, until a professional has tested it.
What can a homeowner clean themselves?
A small job, such as one room, a bathroom refit or a patched ceiling, is well within reach if the work was contained and you have the right vacuum. In order:
- Turn the furnace fan off while you clean, so it does not pull dust into the returns, and open a window if the weather allows.
- Wear a dust mask rated for fine particles and old clothes you can wash straight away.
- Vacuum dry, top down, with a HEPA-filtered vacuum: light fittings, the tops of door frames and cabinets, shelves, window sills, then the floor. Use the brush and crevice tools, not the beater bar.
- Wipe with damp microfibre, wrung out well, again top down. Rinse the cloth often and change the water as soon as it turns grey. A wet, loaded cloth only smears gypsum into a paste.
- Bag the waste and empty the vacuum outdoors.
- Fit a new furnace filter once the cleaning is done, then run the fan.
- Wait a day and repeat the wipe. Whatever was still in the air has landed by then.
For hard floors, a damp mop after the vacuum is enough. For upholstery, vacuum slowly with the upholstery tool and do not rub, which works the dust into the fabric.
What needs equipment?
Three things are hard to do well without it.
Carpet. Mineral dust sifts down through the pile to the backing, below the reach of a household vacuum. Hot water extraction flushes it out and pulls the water back with the dust in it. A rental machine helps, but renting a carpet cleaner vs hiring a professional explains where it falls short.
Volume. A whole floor or a whole house after a gut renovation is a lot of dust. A household vacuum will clog long before it is done, and doing it by hand takes days.
Height and reach. High ceilings, stairwells, pot light recesses and the tops of tall kitchen cabinets need ladders, extension tools and time.
When should you call a cleaner?
Call when the job is bigger than a room, when carpet or upholstery was exposed, or when furniture is due back and there is no time for two passes a day apart. Do not call a cleaner, and do not clean it yourself, if asbestos may have been disturbed. That needs testing first.
Book after the last trade has finished, not between trades, or you will be paying for the same dust twice. What a full post-renovation clean involves and where dust hides is covered in post-renovation cleaning in Toronto.
| Job | Homeowner | Professional |
|---|---|---|
| One room, contained, hard floors | Yes, with a HEPA vacuum and cloths | Optional |
| Whole floor or whole house | Possible but slow | Usually worth it |
| Carpet and upholstery exposed | Vacuum only | Extraction |
| Suspected asbestos disturbed | No | Testing first, by an asbestos professional |
AllCleaner's post-renovation cleaning runs $250 to $600 for a 2,000 square foot home on the published rates, with carpet extraction quoted by the room or square foot, and the figure confirmed before work starts. The full rate card is on the pricing page. Call 647-697-7435.
Short answers.
- Can I use my household vacuum on construction dust?
- It is not a good idea. Fine mineral dust can pass through an ordinary filter and back into the room, and it clogs the filter and bag quickly. Use a vacuum with a HEPA filter, such as a shop vacuum fitted with one, and empty it outdoors.
- Should I sweep up drywall or concrete dust with a broom?
- No. A dry broom lifts fine dust back into the air you are breathing. Ontario's Ministry of Labour guideline on silica says compressed air or dry sweeping should be avoided when cleaning a work area. Vacuum with a HEPA filter, or mist the dust lightly and wipe or wet sweep it.
- Why does dust keep coming back after I clean?
- Because some of it is still in the air, in the ducts and inside closed cupboards. Fine dust takes time to settle, and the furnace keeps moving it around. Change the furnace filter, wait a day, and clean again from the top down. One clean rarely finishes the job.
