How to Choose Glass Thickness for Doors, Railings, Partitions and Facades
Learn how to choose glass thickness for doors, shower enclosures, railings, partitions, windows and curtain wall facades. Practical guide for architectural glass projects.
How to Choose Glass Thickness for Doors, Railings, Partitions and Facades
Choosing the right glass thickness is one of the most important decisions in an architectural glass project. The correct thickness affects safety, strength, appearance, installation cost, hardware selection and long-term performance.
For simple interior partitions, 10mm or 12mm tempered glass may be enough. For balcony railings, laminated safety glass is usually required. For curtain walls and windows, the final glass structure may include tempered glass, laminated glass, Low-E coatings and insulated glass units.
Quick answer: glass thickness should be selected according to application, panel size, support method, wind load, impact risk, building code and hardware system. Never choose thickness by appearance alone.
Why Glass Thickness Matters
Thicker glass is generally stronger and more rigid, but thickness alone does not determine safety. Glass type, processing method, edge quality, holes, notches, panel size, fixing method and installation environment all affect performance.
For example, a frameless glass railing needs much higher structural performance than an interior office partition. A large curtain wall panel exposed to wind load requires a different specification from a small bathroom shelf. This is why architectural glass should be selected by project condition, not only by a standard thickness list.
Common Glass Thickness by Application
| Application | Common Glass Type | Typical Thickness | Notes |
|---|---|---|---|
| Interior glass partitions | Tempered or laminated glass | 8mm, 10mm, 12mm | Depends on height, frame system and acoustic needs. |
| Glass doors | Tempered glass | 10mm, 12mm | Hardware holes and cutouts must be processed before tempering. |
| Shower enclosures | Tempered glass | 8mm, 10mm, 12mm | 10mm is common for frameless shower doors. |
| Balcony railings | Tempered laminated glass | 6+6mm, 8+8mm, 10+10mm | PVB or SGP interlayer may be selected based on structural requirement. |
| Stair railings | Tempered laminated glass | 8+8mm, 10+10mm, 12+12mm | Final specification depends on fixing method and local code. |
| Storefront glass | Tempered, laminated or IGU | 10mm, 12mm, or insulated unit | Security, thermal insulation and impact requirements should be checked. |
| Curtain wall facades | Tempered IGU, laminated IGU, Low-E IGU | 24mm to 44mm overall IGU thickness | Glass structure depends on U-value, SHGC, wind load and facade system. |
| Skylights and canopies | Laminated or tempered laminated glass | Custom engineered structure | Post-breakage retention is important for overhead glazing. |
How to Choose Thickness for Glass Doors
For frameless glass doors, 10mm and 12mm tempered glass are common choices. A thicker panel provides a more solid feel and better rigidity, but it also increases weight and requires stronger hinges, clamps and floor springs.
For framed doors, the frame system may allow thinner glass depending on size and safety requirements. All cutouts, holes and edgework must be completed before tempering because tempered glass cannot be cut after heat treatment.
How to Choose Thickness for Glass Railings
Glass railings usually require laminated safety glass, especially for balconies, stairs, terraces and pool fencing. The reason is simple: if one glass lite breaks, the interlayer helps hold the panel together and reduces the risk of falling glass.
Common railing structures include 6+6mm, 8+8mm, 10+10mm and 12+12mm tempered laminated glass. For structural or frameless railing systems, SGP laminated glass may be considered because it provides higher stiffness than standard PVB interlayers.
How to Choose Thickness for Interior Partitions
Interior office partitions commonly use 8mm, 10mm or 12mm tempered glass. If sound control, privacy or higher safety is required, laminated glass can be used instead. Laminated glass can also be combined with frosted, reeded, tinted or digitally printed designs.
For tall partition walls, wider panels or high-traffic commercial interiors, the glass should be checked with the frame supplier and project engineer before production.
How to Choose Thickness for Facades and Windows
Facade and window glass is usually selected as a complete glass system, not only as a single thickness. A curtain wall project may use tempered insulated glass, laminated insulated glass or Low-E insulated glass units depending on safety and energy performance targets.
For energy-efficient buildings in Europe and North America, insulated glass units are widely used to reduce heat transfer. The overall IGU thickness may range from about 24mm to 44mm, with options such as Low-E coating, argon gas filling, warm-edge spacers, laminated lites and different air gap widths.
Important Factors Before Final Specification
- Panel size and aspect ratio.
- Framed, semi-framed or frameless installation.
- Wind load, snow load or human impact load.
- Local building code and safety glazing requirements.
- Hardware position, hole size, notch design and edge quality.
- Thermal insulation, acoustic performance or solar control requirements.
- Whether the glass is used vertically, horizontally or overhead.
FAQ
What thickness of glass is best for shower doors?
8mm, 10mm and 12mm tempered glass are commonly used for shower doors. 10mm is a popular option for frameless shower enclosures because it balances strength, weight and appearance.
What thickness is used for glass railings?
Common glass railing structures include 6+6mm, 8+8mm and 10+10mm tempered laminated glass. The final thickness should be confirmed according to railing height, fixing method, load requirement and local code.
Can I use tempered glass for balcony railings?
For balcony railings, tempered laminated glass is usually preferred over single tempered glass because laminated glass provides better post-breakage retention.
What is the standard thickness for insulated glass units?
Architectural insulated glass units commonly range from about 24mm to 44mm overall thickness. The final structure depends on glass thickness, air gap, spacer, gas fill, coating and project performance targets.
Is thicker glass always better?
Not always. Thicker glass can improve rigidity, but it also increases weight and cost. The best glass thickness should match the application, safety requirement, support system and engineering calculation.
Need Help Selecting Glass Thickness?
True Glass supplies custom architectural glass for doors, windows, railings, partitions, facades, shower enclosures and commercial building projects. We can support custom thickness, laminated structures, insulated glass units, Low-E coatings, edge polishing, drilling and export packaging.
Contact True Glass with your drawings or project requirements.
