Which material provides support for roofing when applied to trusses?

Roof sheathing serves as a critical component in the structural integrity of roofing systems. When installed on trusses, it acts as a flat surface that provides support and stabilization for roofing materials. This layer is essential for distributing the weight of the roof and any additional loads, such as snow or water, evenly across the trusses. Additionally, roof sheathing contributes to the overall strength and rigidity of the roof system, helping to prevent sagging or structural failure.

The other materials listed, while they can play important roles in roofing systems, do not fulfill the same functions as roof sheathing. For instance, plywood sheathing is often a specific type of roof sheathing, but it doesn’t cover the broader category of different potential sheathing materials. Spaced sheathing is typically used in situations where ventilation is required beneath the roofing material rather than for providing direct support. Insulation material, on the other hand, is designed for thermal performance rather than structural support, playing a role in energy efficiency but not contributing directly to the load-bearing capacity of the roof.