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Sheathing is a general term that is applied to the products that are nailed to wall studs
and to roof rafters. Today, this is most often plywood. Plywood is used as
sheathing because it is relatively light, as compared to solid timber, and most importantly it covers a
large area per sheet, which makes the job go faster. It is also stronger than solid timber, thanks to the
perpendicular layers of fibers of the plywood. The most common thickness of sheathing is 1/2", though this can change depending on construction. If trusses are used for the roof, then a thicker sheathing is usuall called for, since the rafter spacing extends to 24" on center, rather than the standard 16" on center you find with stick-built homes. |
