A condo board called me after a corridor drywall repair set off the fire alarm twice in one afternoon — the dust had gone everywhere except into a bag
A condo board president called me after a week of complaints. Another trade had been patching drywall in two corridors, and the sanding dust had set off a smoke detector twice in one afternoon, emptied the building into the parking lot, and left a fine white film on suite doors, the carpet and the inside of the elevator. Owners were finding it under their doors. The patches themselves were fine. The way they were sanded wasn’t. This post covers how drywall dust gets loose in an occupied building and what a repair crew should be doing to keep it in. It’s for condo boards and property managers, not homeowners.
1. Drywall dust is finer than most people think
Joint compound sands into a powder fine enough to hang in the air for a long time and ride the corridor air supply from one end of a floor to the other. It gets under suite doors, into the elevator shaft and into the return grilles. A crew sanding by hand with no collection can put dust 20 or 30 metres from where they’re working.
It also reads as smoke to many detectors. That’s what happened in this building: the detector closest to the patching tripped, and the building did exactly what it’s designed to do.
What to look at: Before any drywall repair starts in a common area, ask the contractor how they’ll sand and where the dust goes. “We’ll clean up after” isn’t an answer.
2. Sand with collection, not by hand in the open
The best fix is to make less dust in the first place. Sanders connected to a vacuum with a proper filter catch most of it at the wall. Wet sanding with a damp sponge works well on small patches and makes almost none. Using a lighter, easy-sanding compound on the last coat cuts the sanding time down too.
On the corridors I took over, we finished the remaining patches with a vacuum sander and a sponge, and the dust problem stopped the same day.
What to look at: Ask whether the crew uses dust-collecting sanders or wet sanding on common-area work, and look for the vacuum on site the first morning.
3. Close off the work area and the air around it
For anything bigger than a few small patches, the work area should be closed off with a plastic barrier and a zipper door, and the floor covered from the wall out. Return air grilles nearby get covered so the system doesn’t pull dust into the ductwork and spread it to other floors.
Smoke detectors are a building fire safety question, not a painter’s call. Nobody should cover or disable one without the property manager arranging it with the fire monitoring company and following the building’s fire safety plan. I raise it in the pre-start meeting so the manager can decide how it’s handled. More on running work around residents is in painting an occupied condo building.
What to look at: Make detectors and fire monitoring a line item at the pre-start meeting, and confirm in writing who is responsible for it each day.
4. Clean up daily, with the right vacuum
A household or shop vacuum without a fine filter blows the finest dust straight back into the air. A crew should clean the work area every day with a vacuum that has a HEPA filter and wipe down door frames, handrails and the elevator before they leave. Sweeping with a broom just moves it around.
What to look at: Walk the corridor at the end of the first day. If you can write your name in the dust on a suite door or the elevator handrail, the cleanup isn’t working.
5. Let the patches dry before anyone paints
Rushing is part of how dust gets out of hand. When crews try to patch, sand and paint in a day, they sand compound that’s still soft, and it gums up the paper and gets sanded harder. It also tends to show through the finish later, which I go into in drywall patches showing through paint.
What to look at: Ask for the schedule in writing: patch, dry, sand with collection, prime, then paint, with dry time between the coats.
What to do if you’re seeing any of this
If you’ve got drywall repairs coming up in corridors, lobbies or stairwells, or a job underway that’s spreading dust, I’ll walk it with you and tell you what I’d change. I’ll set up the containment, sanding and cleanup plan before we start, and work through detectors and fire monitoring with your property manager. I work with condominium corporations and property managers across Ottawa — Kanata, Nepean, Barrhaven, Orleans, Westboro and Stittsville. Call 613.325.3011 or email yasir@heims.ca.
— Yasir, HEIMS Construction
HEIMS Construction is an Ottawa-based commercial painting and drywall contractor serving condominium corporations, property managers and institutional clients across the Ottawa area. Fully licensed and insured, with $5M commercial general liability coverage.