According to the Building Code, the vertical dimension of a single pane of plastic glazing in unprotected openings above the first story must not exceed how many feet without additional protection?

The correct answer is based on building code regulations that specify the maximum vertical dimension allowed for single panes of plastic glazing in unprotected openings above the first story. A maximum height of 4 feet is established to ensure safety and compliance with performance standards related to impact resistance and structural integrity.

When a pane exceeds this height, additional protective measures are necessary to mitigate risks such as breakage, which could pose hazards in case of impact or weather conditions. Consequently, the regulation defines this limit to maintain safety in building design while allowing for flexibility in glazing choices for heights that can be adequately protected.

Understanding this specification is vital for ensuring safety compliance in glazing installations, as exceeding the maximum height without proper reinforcement or protection could lead to vulnerabilities in the building structure.