Why Glass Weight Matters
Glass weight affects dead load assumptions, frame reactions, brackets, fixings, handling, transport, and installation planning. It also feeds into wider structural glazing review.
Inputs Required
The key inputs are pane width, pane height, glass thickness, and whether the build-up is monolithic, laminated, tempered, or insulated.
Typical kg/m2 Estimate
A common rule of thumb is that glass weighs approximately 2.5 kg/m2 for each millimetre of glass thickness. A 10 mm pane is therefore about 25 kg/m2 before project-specific allowances.
Tempered and Laminated Glass
Tempered glass of the same thickness is normally estimated with the same density basis. Laminated glass weight should include both glass plies and any relevant interlayer allowance.
DGU Glass Weight
For DGU glass, review the weight of both panes and the overall build-up. The cavity affects thermal and load-sharing behavior, while the glass panes normally control most of the dead load.
Glass Load Calculator Context
Weight is one load input, not the whole structural design. It should be considered with wind load, snow load, barrier load, ULS stress, SLS deflection, and support condition.
Using VitraLab
Use the glass weight calculator to enter pane dimensions and glass build-up, then review kg/m2, total pane weight, dead load, and optional interlayer allowance.
Frequently Asked Questions
What is the basic glass weight rule of thumb?
A common estimate is about 2.5 kg/m2 for each millimetre of glass thickness.
How do I estimate laminated glass weight?
Add the glass ply thicknesses together, apply the glass density estimate, and include any project-specific interlayer allowance where needed.
How is DGU glass weight reviewed?
For a DGU, review the glass panes in the build-up and include project-specific allowances where required. The cavity itself is usually not the main contributor to glass dead load.
Does glass weight replace a structural check?
No. Weight is only one input. Stress, deflection, support condition, load combinations, fixings, and project requirements still need to be reviewed.