What is the primary purpose of a setting block in glazing?

The primary purpose of a setting block in glazing is to support the glass and maintain its position. Setting blocks are typically made from materials such as neoprene or other rubber-like substances and are placed at the corners or edges of the glass pane. Their role is crucial as they help to ensure that the glass is properly aligned within the frame, preventing it from shifting or becoming misaligned due to environmental factors or structural movement.

By maintaining the glass's position, setting blocks not only contribute to the stability of the glazing system but also help in distributing the weight of the glass evenly across the frame. This support is essential in preventing stress points that could lead to cracking or breakage. Additionally, by keeping the glass in place, setting blocks help facilitate effective sealing, which can contribute to thermal performance and water resistance, although their primary function remains structural support.