How far does the setting block protrude from the glass?

The correct answer is that the setting block typically protrudes from the glass by 1/8 inch. Setting blocks are crucial in glazing applications as they provide support to the glass and help maintain its proper position in the frame. The 1/8 inch protrusion allows for adequate spacing and is designed to absorb the thermal expansion of the glass while ensuring that it remains stable under various conditions.

This particular measurement also facilitates effective drainage and directs water away from the glass, which is important for preventing issues such as water ingress and damage over time. Properly spacing the glass with the right size of the setting block is key to the longevity and performance of the glazing system. Using a setting block that protrudes too little or too much can lead to complications, such as improper installation or failure to accommodate movement, which underscores the significance of adhering to the standard measurement of 1/8 inch.