Why are your windows fogging up between the glass?

You wipe the inside of your window. You clean the outside. The cloudiness still will not disappear. When fog is trapped between panes of insulated glass, the issue is usually inside the sealed glass unit.

What the seal is supposed to do

Double- and triple-pane windows use sealed glass assemblies. These units may contain insulating gas fills and spacers designed to limit moisture and heat transfer. When the seal no longer performs as designed, moisture can enter the space between the panes.

How to distinguish the moisture

Condensation on the room-facing surface can often be wiped away and may relate to indoor humidity or surface temperature. Moisture between sealed panes cannot be reached with a cloth. A cloudy or milky appearance that changes with weather can also be a clue.

Repair glass or replace the whole window?

Some window products allow replacement of the insulated glass unit without replacing the entire frame. Full replacement may make more sense if the sash, frame, hardware, or surrounding installation has additional problems. Manufacturer warranties and parts availability can influence the choice.

Do not ignore the installation

Even a high-performance glass package will not solve a draft caused by poor perimeter air sealing or a leak at the flashing. Evaluate glass condition, window operation, and surrounding trim together when deciding on repairs.

Frequently Asked Question

Does fog between panes mean the window is leaking into the house? Not necessarily. It often indicates a failed insulated-glass seal, which is different from rainwater leaking through the wall or frame.

Ready to improve your home exterior?

Reliant Roofing helps homeowners in Foley, Princeton, St. Cloud, Brainerd, and surrounding Central Minnesota communities with roofing, siding, windows, and other exterior projects. Contact our team to discuss the condition of your home and the options that fit your goals.

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