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Usually interior walls are usually a 2x4 3 1/2 inches thick with 1/2 drywall on each side so they are 4 1/2 inch thick. Exterior walls are a 2x4 3 1/2 inches thick with 1/2 drywall on the interior and then the exterior covering which can vary in thickness depending on type. In countries that use 'mm' as their measurement, exterior wall 270mm (110mm Brick, 50 Cavity, 110mm Brick/Stud Wood Framing) and interior walls 110mm (Brick/Stud Wood Framing).
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