The choice of drywall thickness for a detached garage depends on the specific requirements and regulations in your area. In general, detached garages are not typically subject to the same building code requirements as living spaces within a house. However, it's essential to consult your local building codes or consult with a professional to ensure compliance with any specific regulations in your area.
While 5/8-inch drywall is commonly used for fire-rated walls in residential interiors, it may not be necessary for a detached garage unless local codes or specific circumstances dictate otherwise. Thinner drywall options, such as 1/2-inch or 3/8-inch, may be more commonly used in detached garages, depending on local regulations and personal preferences.
Again, it's important to consult with local building authorities or professionals experienced in your specific area to determine the appropriate drywall thickness for your detached garage, taking into consideration any fire safety, insulation, or other relevant requirements.