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 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 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) the same formula applies, but all you need to do is add the glass thickness on each side together. A 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 then glass can be very heavy, this piece would require a crane to lift it into place.
Nu-Line Windows solely use commercial hardware and frames that are specifically designed with large and heavy pieces of glass in mind. As such, lifting large and heavy pieces of glass is standard procedure for us. Below is a picture of our team craning in a 350+kg piece of glass in Toorak