According to the Building Code, how high can plastics in unprotected openings be installed above grade level?

The maximum height for installing plastics in unprotected openings above grade level is set at 65 feet according to the Building Code. This regulation is primarily established to ensure safety and fire resistance in building design. Plastics, while versatile and used in various construction applications, have specific limitations when it comes to their use in unprotected openings due to their combustibility and the potential for fire spread.

By limiting the height to 65 feet, the code aims to mitigate risks associated with fire safety. At higher elevations, the fire exposure and potential spread increases, thus necessitating stricter controls on the materials allowed in these applications to protect occupants and property. This standard is particularly relevant in commercial and multi-story residential buildings where the height can pose serious challenges to fire management and prevention strategies.

The other listed heights are not applicable for unprotected openings as per the current codes and regulations, illustrating the careful balancing act that building codes perform between materials' properties and safety needs.