Windows, Doors & Glazing · Property Services
Failed Window Seal & Glass Unit Replacement
When the seal fails on a double-pane window, moisture gets between the panes and leaves a permanent haze. The frame is often fine, so replacing only the glass unit is much cheaper than a new window. NorTech connects you with vetted licensed glaziers who set their own price and measure and install matching glass.
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How seals fail and what fogging means
Insulated glass units have two panes separated by a spacer and sealed at the edges. Over time, sun, heat and movement can break the seal, letting humid air in. Condensation then forms inside the glass and cannot be wiped away. A fogged unit insulates less and looks unattractive, but the frame may still be perfectly good. A glazier checks the frame, hardware and the weatherstripping, and confirms that replacing just the unit makes sense. Take a photo of the fogged window in daylight, and include the label or etching on the spacer if you can see it, to help the glazier identify the glass.
Measuring and ordering a matching unit
The glazier removes a stop or trim to measure the unit’s exact thickness and size, notes the glass type and coatings and orders a replacement. Matching low-E coatings and tint helps avoid mismatched appearance between windows. Special units such as tempered, laminated or obscure glass may be required by code. Lead times are usually one to two weeks. Ask whether the old glass can be reused for reference or whether the new unit will be slightly different.
Installation and when a new window is better
Installation involves removing the old unit, cleaning the frame, setting the new glass on blocks and securing it with new glazing tape or sealant. If the frame is warped, rotted or inefficient, a full window replacement may be wiser. A glazier explains the comparison, including energy performance and remaining frame life. Keep the invoice and warranty for the new unit, and watch for new fogging that would indicate a defective seal. Remember to ask the glazier about the other windows from the same set, because they are likely the same age and may start to fail soon.
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