Why does the sealed Aluminium Window produce condensation inside the glass?

Core Physical Principles of Internal Condensation in Sealed Aluminium Window GlassIf you are a builder, contractor, or window supplier, water fog and tiny water drops trapped inside window hollow glass. This commonly happens on aluminium window [https://www.gxglasswindow.com/aluminium-window/] units used in residential and commercial buildings. Unlike surface fog that you can wipe away easily, this internal condensation forms inside the fully sealed glass cavity and cannot be cleaned manually. When the weather turns cold or rainy, the outdoor glass cools down quickly. Once the trapped moist air inside the hollow glass hits the dew point, water vapor condenses and sticks to the inner glass surface. Knowing this basic rule helps you quickly identify and fix condensation problems on construction sites.

Image: https://ecdn6.globalso.com/upload/p/4298/image_other/2026-07/aluminium-window1.jpeg

How Structural Defects of System Window Cause Persistent Internal Glass Condensation in ConstructionMany people assume that system window products never have condensation troubles because of their high-performance design. After years of production and on-site service, we have found that most recurring internal condensation issues stem from poor factory processing and improper installation, rather than design defects. If low-quality sealing strips are used, desiccant dosage is insufficient, or edge sealing is uneven, tiny invisible gaps will remain. With time going by, humid outside air seeps slowly into the sealed glass cavity. This causes continuous fogging and condensation, which are among the most common quality complaints for finished building projects.

Fixed Window vs Casement Window: Comparison of Condensation Causes in Construction ScenariosFixed window and casement window are the two most widely used window types in modern architectural projects, and they have totally different possibilities of developing internal condensation. So if condensation appears inside its glass, the problem is almost always caused by unqualified hollow glass processing at the factory.Even with high-quality glass panels, careless field installation and incomplete gap sealing will ruin the overall tightness. This explains why casement window products are more likely to suffer moisture infiltration and internal condensation, requiring more careful installation on construction sites.

Negative Impacts of Aluminium Window Internal Condensation on Building Envelope and Energy EfficiencyMost building owners take internal glass condensation lightly, thinking it only affects window appearance.When water accumulates inside the hollow glass for a long time, it will completely use up the desiccant inside an aluminium window. This leads to permanent fogging, mildew stains and dirty marks that can never be repaired. Worse still, persistent condensation weakens the window's thermal insulation ability, speeding up indoor and outdoor heat exchange and lowering the building's energy-saving performance. In severe cases, condensed water seeps into profile gaps and causes oxidation and corrosion, greatly shortening the service life of all installed windows.

Image: https://ecdn6.globalso.com/upload/p/4298/image_other/2026-07/aluminium-window2.jpeg

Standard Construction Optimization Solutions to Eliminate Internal Condensation of Sealed System WindowBased on decades of manufacturing and after-sales experience, most window condensation problems can be totally avoided with standard production and scientific installation. First, always choose certified and well-made aluminium window products, which adopt standard hollow glass technology, full desiccant filling and complete double-layer sealing to guarantee stable anti-condensation performance. Second, construction workers need to carefully seal all assembly gaps during installation, especially the connecting joints of fixed window units. For coastal and rainy high-humidity regions, thermal break window structures are highly recommended. They effectively reduce indoor and outdoor temperature differences and stop condensation from forming inside sealed glass cavities.

Construction Acceptance and Daily Maintenance Rules to Prevent Recurring Window CondensationProper project inspection and regular daily maintenance are the best ways to stop repeated glass condensation issues for your building windows. During project acceptance, construction teams should strictly check the sealing tightness, glass cavity dryness and glue uniformity of every system window on site, and reject all unqualified products. You need to inspect aging sealing strips and loose hardware parts regularly for every casement window.

Founded in 2006, Jiangsu Guoxin Glass Co., Ltd. has grown into a reliable glass manufacturer with 20 years of professional R&D and production experience. We provide stable quality and customized support for all clients. Feel free to contact us anytime for professional window glass consultation and project cooperation!

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