How thick is the fire stopping wood typically used in construction?

Fire stopping wood used in construction is typically 2 inches thick. This thickness is specified because it provides an effective barrier to the spread of fire and smoke through wall and ceiling assemblies. The 2-inch thickness is designed to adequately fill any gaps in structural elements, preventing the passage of flames and smoke and ensuring that fire-rated assemblies maintain their integrity during a fire event.

Using materials of this specific thickness also aligns with building codes and fire safety regulations that require adequate fire-stopping measures in construction to protect occupants and property. Ensuring that the fire stopping wood meets the prescribed thickness is essential for compliance with safety standards and effective fire protection practices in buildings.