Insulated Glass Units (IGUs), commonly used in windows and doors, fail primarily due to the breakdown of their seals. These units consist of two or more panes of glass separated by a spacer and sealed around the edges to create an airtight cavity. Over time, exposure to temperature fluctuations, UV radiation, and moisture can degrade the sealant materials. This deterioration allows moisture and air to infiltrate the space between the panes, compromising the thermal performance of the IGU and leading to visible issues such as condensation and fogging.
Condensation residue inside an IGU occurs when moisture penetrates the sealed space. As the temperature changes, the moisture condenses on the interior surfaces of the glass, especially during cooler weather. Unlike external condensation, which can be wiped away, internal condensation remains trapped. Over time, the moisture can leave behind mineral deposits and other residues as it evaporates and recondenses. These residues create a foggy or hazy appearance that is difficult, if not impossible, to clean without replacing the entire unit.
Another contributing factor to IGU failure is the desiccant material used in the spacer system. Desiccants are designed to absorb moisture within the sealed cavity, preventing condensation. However, when the seal fails, the desiccant becomes saturated and can no longer effectively manage moisture levels. This saturation accelerates the buildup of condensation and contributes to the cloudy appearance of the glass. In some cases, the desiccant itself may degrade or leach out, further exacerbating the problem.
The foggy appearance caused by condensation residue is not just a cosmetic issue; it also indicates a loss of the IGU's insulating properties. The trapped air or inert gas, such as argon, that originally provided thermal insulation is replaced with humid air from the environment. This results in reduced energy efficiency, increased heating and cooling costs, and diminished comfort for occupants. Addressing this issue often requires replacing the failed IGU, as repair methods are generally ineffective in restoring both the aesthetic and functional integrity of the glass unit.
If the glass units in your home or business are foggy, reach out to MGSI Glass today to schedule a free estimate for replacement. Our team can get your glass replaced quickly, restoring the performance and aesthetics of your windows to like new.
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