Window-glass terminology can make a straightforward replacement feel confusing. Two phrases appear often: insulated glass unit and Low-E. They describe different parts of the glass package, and neither should be selected without considering the existing window and the project goal.
What an insulated glass unit is
An insulated glass unit, often called an IGU, uses two or more panes separated and sealed around the edge. If moisture appears between the panes, the condition may involve that sealed unit. Surface condensation is different, so photos from both sides and a description of when the moisture appears are useful.
What Low-E describes
Low-E refers to a coating designed to affect how radiant energy moves through glass. Coating options and placement vary. Matching an existing unit can involve appearance, tint, coating, thickness, spacer, and overall dimensions—not only the number of panes.
What can remain in place
Some projects allow replacement of the glass unit while the existing frame remains. Others reveal frame, sash, drainage, or operational issues that need separate attention. Star Glass reviews the actual opening before confirming the scope.
Before you submit the opening
Take wide photos from inside and outside plus close views of the damage, moisture, frame, sash, trim, labels, and operating hardware. Note the room or elevation, whether the opening operates and locks, and whether the condition is on a reachable surface or appears trapped between panes. Include approximate dimensions for identification, but expect Star Glass to confirm the final measurement path.
What happens after the first review
Star Glass determines whether the request appears to involve glass only or whether the frame, sash, door, drainage, structure, or another trade may also need attention. The authoritative quote follows confirmed scope and measurements. Keep the same opening label and reference through revisions so the final glass unit is not confused with another window or door.
Ready to Get Started?
Use the window glass replacement page to start, then share clear photos and any readable window label. The final glass make-up, measurements, availability, and price are confirmed for the specific opening.
Call or text: (504) 368-8826 Email: glass@starglass.com
Visit us: 1000 Westbank Expy, Gretna, LA 70053