What is the minimum thickness requirement for draft-stopping materials?

Minimum thickness requirements for draft-stopping materials are crucial for ensuring both safety and compliance with building codes. Draft-stopping limits the movement of air and smoke through concealed spaces in buildings. In this context, the correct answer indicates that either 1/2 inch gypsum or 3/8 inch plywood can be utilized as acceptable materials for draft-stopping.

Using 1/2 inch gypsum board is a common practice as it provides a sturdy barrier capable of resisting the passage of smoke and flames. Similarly, 3/8 inch plywood offers sufficient strength and durability for achieving the desired fire stop performance. Building codes typically specify these thicknesses based on their ability to effectively manage fire and smoke in spaces that may otherwise allow these elements to travel freely, increasing risk.

In contrast, the other options do not fully meet the standards set for draft-stopping. While 3/8 inch gypsum is a standard size, it does not provide the same level of fire protection as the specified materials, and options such as 1 inch plywood exceed the requirement unnecessarily. Understanding these nuances is essential for compliance with building codes and for ensuring safety in construction practices.