What is the maximum mean roof height for wood structural sheathing in enclosed buildings as per the specified regulation?

The maximum mean roof height for wood structural sheathing in enclosed buildings is set at 30 feet according to the specified regulations. This height is determined to ensure that the structural integrity of wood sheathing is maintained under various environmental conditions, such as wind and snow loads. The regulation takes into account the mechanical properties and performance of wood materials, which can vary based on height and exposure.

By capping the mean roof height at 30 feet, the regulation aims to prevent potential issues with structural failure that could arise from exceeding this limit. It balances safety considerations with feasible construction practices, ensuring that buildings can be safely constructed while still allowing for adequate design flexibility.

Other height options exceed the recommended limits, leading to increased risk factors that may compromise the structural performance of wood sheathing. Thus, the choice of 30 feet aligns with safety standards in construction practices.