the.com/sheathing

The plywood skin that turns a stick skeleton into a building that fights back.

means The structural layer of panels or boards fastened over a frame's studs, joists, or rafters to brace it and provide a base for siding, roofing, or flooring.

from From 'sheath,' the case that holds and protects a blade, which traces back through Old English 'scēath' to a Germanic root meaning something split or divided — likely originally picturing wood cleaved into a thin protective casing. The leap to carpentry is natural: just as a sheath wraps and guards a sword, sheathing wraps and guards a building's bare wooden bones.

job one
transfers wind and shear loads to the frame
common materials
plywood, OSB, foam board, or fiberboard
hidden hero
nailing pattern matters more than panel thickness
also means
the layer under siding, roofing, or floors
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