13/02/2026
It's a tad chilly here in Barnsley at the minute .. Rain , Sleet , Ice , Snow .... Don't get caught short .. 😏
Snow, ice, and extreme cold act as catalysts for failing double-glazed units, accelerating the breakdown of already weakened seals and highlighting existing defects.
Harsh conditions turn existing microscopic gaps into major, visible problems, resulting in condensation between the panes, reduced energy efficiency, and potential glass breakage.
How Snow and Cold Impact Failed Units:
Expansion/Contraction Cycle (Solar Pumping): Cold temperatures cause the materials in the window (glass, frame, and seal) to contract, while sunlight causes them to expand. This repeated cycle, often worsened by snow/ice accumulation, weakens the bond of the seal over time, leading to premature failure.
Freeze-Thaw Damage: If water enters a failing seal, it can freeze, expand, and shatter the existing, fragile seal further.
Increased Thermal Stress & Breakage: When it is extremely cold outside and warm inside, especially if a radiator is directly under the window, the dramatic temperature difference can cause the glass to experience thermal stress. This can cause already compromised (failed) units to crack.
Pressure Changes: Extreme cold causes the air inside the sealed unit to contract, creating a partial vacuum that can lead to pressure cracks.
Water Infiltration: As snow on sills and frames melts, it can seep into failed seals or rotting frames, leading to faster degradation and further moisture entering the unit.
If your unit has failed you will see :
Condensation Between Panes: Moisture that cannot be wiped away, forming as fog or ice inside the unit.
Increased Heat Loss: The room with the window feels colder, and energy bills rise due to the loss of the insulating air/gas gap.
Draughts: Cold air is felt directly around the frame, indicating the seal has broken down.
Water Leaks: Water entering the room from the window frame.
Protecting Units from Winter Damage:
Clear Snow and Ice: Regularly clear snow and ice from window sills and frames to prevent water from sitting on seals.
Inspect Regularly: Look for signs of moisture between the panes, particularly during winter, to catch failures early.
Improve Ventilation: Use trickle vents or open windows briefly to reduce internal condensation, which can contribute to rot in older frames.
Fix Promptly: Failed units cannot be repaired, so the sealed unit must be replaced to restore energy efficiency. Here at Barnsley Glass and Glazing we can give you a free, quick quote on how much it will cost to replace any glass and seals .