What is a good exterior wall thickness to soundproof?

A good exterior wall thickness for soundproofing typically ranges from 6 to 12 inches, depending on the materials used and the desired sound reduction. Walls constructed with dense materials like concrete or brick tend to provide better sound insulation. Additionally, incorporating soundproofing techniques such as staggered stud construction, acoustic panels, or adding soundproof drywall can enhance effectiveness. Ultimately, achieving optimal soundproofing also depends on sealing gaps and improving window and door sound isolation.