Foggy Window Repair Toronto & GTA – Restore Clarity

Condensation trapped between window panes is one of the most common window problems in Ontario homes, and it signals that your sealed unit has failed. Once the hermetic seal around an insulated glass unit (IGU) is compromised, moisture enters the cavity and causes persistent fog, haze, and mineral deposits that worsen over time. OhMyGlass specializes in foggy window repair across Toronto and the GTA. Our solution replaces only the glass unit - not the entire window frame - making it a fast, cost-effective way to restore clarity, insulation, and curb appeal.

What Causes Windows to Become Foggy?

Foggy windows are caused by a failure of the perimeter seal that keeps the insulated glass unit airtight. Several factors contribute to seal degradation over time.

• Age - most IGU seals have a functional lifespan of 15 to 25 years. As the sealant materials age, they lose flexibility and adhesion.
• UV exposure - prolonged direct sunlight breaks down the organic compounds in the sealant, particularly the primary polyisobutylene seal.
• Temperature cycling - Ontario's wide seasonal temperature range causes the glass and frame to expand and contract repeatedly, stressing the seal at the glass-to-spacer bond.
• Moisture exposure - water that pools on the sill or is driven into the frame by rain can accelerate sealant deterioration from the outside.
• Poor original installation - IGUs that were installed without proper glazing support, drainage, or edge clearance may fail prematurely.
• Manufacturing defects - occasionally, the factory seal or desiccant is inadequate, leading to early failure within the first few years.

How to Tell If Your Window Seal Has Failed

Not every instance of window condensation means a failed seal. Condensation on the interior surface of a window is usually a humidity issue inside the home. Condensation between the panes - visible from neither side and impossible to wipe away - is the definitive sign of seal failure.

• Persistent haze or fog between the two panes of glass that appears and disappears with temperature changes but never fully clears.
• Visible water droplets forming between the panes, especially noticeable in the morning or on cold days.
• White or chalky residue between the panes - mineral deposits left behind after moisture repeatedly evaporates inside the cavity.
• A milky or cloudy appearance that reduces visibility and blocks natural light.
• A distorted or wavy look to objects viewed through the window, caused by moisture interfering with the glass surfaces.

How We Fix Foggy Windows

Our repair process replaces the failed insulated glass unit while preserving the existing window frame. This avoids the cost and disruption of a full window replacement.

• On-site inspection - we confirm the seal failure and check the condition of the frame, sash, and hardware to ensure they can support a new IGU.
• Precise measurement - we measure the opening and note the glass type, thickness, spacer width, and any coatings (Low-E, tinted) on the original unit.
• IGU fabrication or sourcing - a new factory-sealed unit is built to your exact specifications, including your choice of glass coatings and gas fill.
• Careful removal - the interior and exterior glazing stops are removed, and the failed IGU is extracted without damaging the frame or trim.
• Installation and sealing - the new unit is set into the frame with proper shimming and glazing, then the stops and sealant are reinstalled. Most windows are completed in under an hour.

Why Replace the Glass Unit Instead of the Whole Window?

Full window replacement - removing and replacing the frame, sash, hardware, and glass as a complete unit - makes sense when the frame itself is damaged, rotted, or warped. But in the majority of foggy window cases, the frame is still structurally sound and only the sealed glass unit has failed. Replacing just the IGU typically costs 60 to 80 percent less than a full window replacement. It is also faster (usually under an hour per window), causes no damage to interior or exterior trim, and preserves the original look of your home. OhMyGlass always inspects the frame first and recommends full replacement only when the frame condition warrants it.