Can construction debris scratch new windows if not cleaned properly in Ottawa?

Yes, construction debris can scratch new windows, and improper cleaning techniques make the problem significantly worse. Glass, including double-pane and low-E coated windows, can be scratched by the fine abrasive particles that construction generates. Understanding this risk is essential before attempting any post-construction window cleaning yourself.

How Construction Debris Damages Glass

The main culprits are concrete dust, mortar particles, drywall compound, and dried stucco fragments. These materials can act as fine abrasives when trapped between a cleaning cloth and the glass surface, and tracked-in soil and site dust can embed in cleaning cloths too. When you wipe a window with a cloth that has picked up these particles, you are essentially sanding the glass with each pass. The scratches may not be visible immediately but become glaringly obvious when sunlight hits the window at certain angles.

Ottawa's climate can add to this problem. During winter construction, dry indoor air lets fine drywall dust and concrete particles drift through the house. These particles settle on window glass in a nearly invisible layer that looks harmless but contains abrasive grit. Summer construction creates different risks, as mortar and stucco splatter can dry quickly in hot weather and stick hard to glass. The longer these materials sit on the glass, the harder they are to remove without scratching.

The most dangerous cleaning mistake is using a dry cloth or paper towel on construction-contaminated glass. Never dry-wipe windows after construction. Even microfibre cloths, which are excellent for regular cleaning, will scratch glass if they pick up construction grit particles. The proper technique is to first rinse the glass thoroughly with clean water to flush away loose particles before any wiping contact. Many window cleaners use a flood-and-squeegee method where the glass is saturated with cleaning solution, then cleared with a clean rubber squeegee in a single pass, minimizing cloth contact with the glass surface.

Low-E coated glass deserves extra care. The low-E coating is a very thin layer applied to one surface of the glass, and depending on the window it may sit on a surface that can be reached during cleaning. It is not always obvious which surface is coated, so check the manufacturer's documentation, because cleaning a coated surface with abrasive materials can damage it. Replacing a scratched pane is far more expensive than cleaning it carefully in the first place.

If you notice scratches on new windows, raise them with your builder or contractor promptly and in writing, with photos, so they are documented. For the cleaning itself, ask any company you are considering how they remove construction debris from glass without scratching it. You can browse cleaning contractors through the Ottawa Construction Network directory at justynrookcontracting.com to find companies that do post-construction window work.

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

• Justyn Rook Contracting
• JC Carpentry
• Valcor Construction
• Steven Labelle - Your Complete Home Renovator
• Capital City Drywall