The answer to 'difference between roof decking' is that roof decking refers to the structural material that forms the base of a roof, while roof sheathing is the outer layer that provides a surface for roofing materials like shingles or tiles. Roof decking is typically made of plywood, oriented strand board (OSB), or dimensional lumber, and it provides the structural support for the roof. Roof sheathing, on the other hand, is a thinner material, usually made of plywood or OSB, that is installed over the roof decking to create a smooth, flat surface for the roofing materials.
The main differences between roof decking and roof sheathing are their thickness, structural properties, and purpose. Roof decking is thicker and more durable, designed to support the weight of the roof and any additional loads, such as snow or wind. Roof sheathing is thinner and serves primarily as a base for the roofing materials, providing a smooth surface and helping to distribute the weight evenly.