A complete reference for glass thickness from 3mm to 12mm -- covering applications, weight per square foot, and recommendations for windows, shower doors, tabletops, railings, and commercial storefronts.
Choosing the right glass thickness is critical for safety, performance, and aesthetics. This guide covers every common thickness and helps you understand which option is right for your project.
Reference Chart
Standard glass thicknesses, their imperial equivalents, weight per square foot, and typical applications.
| Thickness | Imperial | Weight / sqft | Common Use |
|---|---|---|---|
| 3mm | 1/8" | 1.64 lbs | Residential IGU panes |
| 4mm | 5/32" | 2.18 lbs | Single-pane windows |
| 5mm | 3/16" | 2.73 lbs | Larger single-pane windows |
| 6mm | 1/4" | 3.27 lbs | Commercial storefronts |
| 8mm | 5/16" | 4.37 lbs | Semi-frameless shower doors |
| 10mm | 3/8" | 5.46 lbs | Standard frameless showers |
| 12mm | 1/2" | 6.54 lbs | Premium shower enclosures |
By Application
Understanding Glass Thickness
Glass thickness is measured in millimeters (mm) and determines the strength, weight, and suitability of glass for different applications. The most common thicknesses range from 3mm for lightweight residential uses to 12mm for heavy-duty structural applications like frameless shower doors and glass railings. Understanding the relationship between thickness, application, and safety requirements is essential for any glass project.
For residential windows, the glass thickness is just one factor in overall performance. A double-pane insulated glass unit using two panes of 3mm glass with Low-E coating and argon gas fill will outperform a single pane of 12mm glass for energy efficiency by a significant margin. The spacer system, gas fill, and coatings matter far more than raw thickness when it comes to thermal performance.
Safety codes dictate minimum glass thickness for specific applications. Tempered glass is required in locations where human impact is likely -- shower doors, glass railings, sidelights near doors, and low windows. Laminated glass, which bonds two or more glass layers with a plastic interlayer, provides additional safety by holding broken glass in place and is increasingly required for glass railing and overhead glazing applications.
FAQ
Common questions about glass thickness, applications, and specifications.
Frameless and semi-frameless shower door installation using 8mm to 12mm tempered glass.
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Learn MoreFrameless glass railing systems using 10mm to 12mm tempered or laminated glass.
Learn MoreCustom tempered glass cut to size for tabletops, shelves, and safety applications.
Learn MoreOur glass experts can recommend the perfect thickness for your project. Free consultations and estimates for all glass applications.