What is the minimum thickness for wall sheathing?

The minimum thickness for wall sheathing is typically 9 mm (3/8 inch). This thickness provides adequate structural support and insulation while allowing for easy handling and installation. It is commonly used in residential construction where the sheathing serves to brace the walls, provide a nailing surface for the exterior cladding, and contribute to the overall energy efficiency of the building.

Thinner options, such as 6 mm (1/4 inch), do not provide sufficient strength for typical wall applications and can compromise the stability of the structure. While 12 mm (1/2 inch) and 15 mm (5/8 inch) options offer more durability and insulation, they may be unnecessarily thick for standard wall sheathing in many scenarios, leading to increased material costs and overall weight. Thus, 9 mm (3/8 inch) strikes a balance between strength, insulation, and practicality, making it the minimum standard thickness for wall sheathing.