What is the minimum space required between insulation and the roof deck sheeting?

The correct answer is based on building codes and best practices for insulation installation. A minimum space of 1 inch between insulation and the roof deck sheeting is important for allowing proper ventilation. This ventilation helps to prevent moisture buildup, which can lead to mold growth and deterioration of building materials over time.

Maintaining this air gap allows air to circulate, thus helping to regulate temperature and humidity levels in the roof assembly, contributing to the overall durability and energy efficiency of the structure. Adequate space is crucial for preventing heat transfer as well, which in turn can assist in maintaining consistent indoor temperatures.

Options that suggest a larger gap may offer additional ventilation, but they are not the minimum requirement set forth in typical building regulations.