Glass thickness guide: what to use where
Recommended glass thickness for the six most common applications in Indian homes and offices, with the one-sentence rule for each. These are typical fabrication practice in India — always confirm the final specification with your fabricator for your exact sizes and site conditions.
Thickness by application
| Application | Thickness | Glass type | Rule of thumb |
|---|---|---|---|
| Shower enclosure | 8–10mm | Toughened | 8mm for hinged doors and fixed panels; 10mm for frameless doors over 2.1m. |
| Glass partition | 10–12mm | Toughened | 10mm for framed or patch-fitted partitions; 12mm for frameless full-height glass walls. |
| Glass railing | 12mm | Toughened laminated / toughened | 12mm toughened laminated where the railing guards a fall; 12mm toughened with a handrail elsewhere. |
| Table top | 10–12mm | Toughened | 12mm or more if the glass spans without full support; 6–8mm if it sits fully on a wooden top. |
| Wardrobe shutter | 5–6mm | Lacquered / mirror + safety film | 5–6mm keeps sliding shutters light on their rollers; always specify a safety backing film. |
| Window | 5–6mm | Float (annealed) | 5–6mm float for standard residential windows; 8mm or a DGU for large or noise-facing openings. |
How thickness is decided
Span and deflection. Glass bends under its own weight and under load; the larger the unsupported span, the thicker the glass must be to keep that bending within safe, rattle-free limits. This is why a 2.4m frameless door needs 10–12mm while a 1m framed window pane is fine at 5mm.
Safety. Wherever a person can fall against the glass — showers, doors, partitions, railings — typical Indian practice is toughened safety glass per IS 2553 (Part 1), and toughened laminated glass where broken glass falling away would itself be the hazard, such as balcony railings.
Hardware and weight. Hinges, patch fittings, spigots and sliding channels are made for specific thickness ranges and weight ratings — glass weighs 2.5 kg per m² per mm, so a jump from 8mm to 12mm makes every panel 50% heavier and can push a door past its hinge rating.
Wind load (exteriors). Windows and facade glass on high floors or in coastal cities are sized for wind pressure (IS 875 governs the loads), which is why the same window that takes 5mm at ground level may need 6–8mm or a DGU on the twentieth floor.
Detailed guides by application
- Shower enclosure glass thickness — 8mm vs 10mm, hinged vs sliding, hardware ratings.
- Glass partition thickness — framed, patch-fitted and frameless office partitions.
- Glass railing thickness — balcony and staircase balustrades, laminated vs plain toughened.
- Table top glass thickness — dining, coffee and office tables, supported vs spanning.
- Wardrobe shutter glass thickness — lacquered and mirror sliding shutters.
- Window glass thickness — float glass sizes, when to move to 8mm or a DGU.
Frequently asked questions
What glass thickness is most common in India?
5mm and 6mm float glass cover most residential windows, while 8mm, 10mm and 12mm toughened glass cover showers, partitions, doors and railings. Thicker sizes like 15mm and 19mm are reserved for structural and speciality work.
Is thicker glass always better?
No. Every extra millimetre adds 2.5 kg per square metre, which means heavier lifting, costlier hardware and a higher price per square foot. The right thickness is the one that meets the deflection and safety requirement for that span — going beyond it mostly buys weight.
How is the right glass thickness decided?
Four things decide it: the unsupported span (bigger panels bend more), the safety requirement (can a person fall against or through it), the hardware (hinges and channels grip specific thicknesses) and, for exteriors, the wind load. Fabricators size glass for the worst of the four.
When is toughened glass mandatory?
Typical practice in India is toughened safety glass (per IS 2553 Part 1) wherever people can impact the glass — shower enclosures, frameless doors, partitions along corridors, full-height glazing and table tops. Building byelaws and the National Building Code guide the exact locations, so confirm with your architect.
Does thickness change the price of glass?
Yes, roughly in proportion: 12mm glass uses about twice the material of 6mm and costs broadly in that ratio, before toughening and edgework. Actual rates depend on brand, city and quantity — treat any per-sq-ft figure as indicative and get a written quote.
Can I use different thicknesses in one project?
Yes, and you usually should: a home may use 5mm windows, 8mm shower glass, 10mm partitions and 12mm railing glass side by side. Matching each application to its own requirement is cheaper and safer than standardising on one thickness everywhere.
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