Glass, like water, is deceptively heavy for its relatively small physical size. Glass weight plays a big factor in determining what type of hardware and frame is required for our aluminium bifold doors, stackable and sliding doors, frameless glass doors and windows. It also plays a role in determining the number of people required to lift glass into place or if a crane is required.
The basic formula to calculate the weight of glass is as follows:
Height (m) x width (m) x glass thickness (mm) x 2.5 = glass weight (kg)
Note, that the height and width should be in meters and the glass thickness should be in millimetres. Let’s use this formula in an example.
A glass piece that is 6.38mm thick and has a height of 1.2m and width of 1.6m will have a glass weight of ~30.62kg (1.2 x 1.6 x 6.38 x 2.5 = 30.62kg). If you are trying to figure out the weight of a double-glazed unit (sometimes known as an insulated glass unit or IGU) the same formula applies, but all you need to do is add the glass thickness on each side together. An 8mm glass / airspace / 8mm glass double glazed unit with a height of 3.2m and a width of 2.8m will thus have a weight of ~358.4kg (3.2 x 2.8 x 16 (both panes of glass added together) x 2.5 = 358.4kg). As you can see, this glass will be very heavy and would thus require a crane to lift it into place.