Definition
Sheathing is structural panel material (plywood or OSB) installed over framing to provide lateral bracing and substrate for roof, wall, and floor coverings. Proper fastening is critical for structural performance.
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Sheathing panels are typically 7/16-inch to 1-1/8-inch thick plywood or OSB rated for structural use. Roof sheathing, wall sheathing, and floor sheathing each serve specific purposes. Proper fastening with nails or screws is critical for structural performance. Sheathing must be covered or protected from weather to prevent swelling. Plywood is more moisture-resistant than OSB. Sheathing is essential for code compliance and structural rigidity.
Pro Tip
Verify sheathing is installed and properly fastened before roof installation. Missing or loose sheathing compromises structural integrity.
Example
Roof sheathing uses 7/16-inch OSB fastened with 8d nails at 6-inch spacing to provide structural bracing for the truss system.