The glass in railings is designed to withstand normal temperature fluctuations between summer heat, cold, and frost. It may also flex slightly when subjected to wind, but this is not a sign of a problem. The extent to which the glass is affected depends on the type of glass, its size, how it is mounted, and the edge treatment. The glass is designed for outdoor use.
Large and rapid temperature changes place a greater strain on the glass than gradual changes—for example, when part of the glass is heated by the sun while the rest remains cold. Some movement in larger glass panels is normal in windy conditions and depends on the size, thickness, and mounting. Frost will not cause a properly sized glass railing to crack—the key is that the glass, hardware, and mounting are suitable for the location.
