Which practice is recommended to prevent sound flanking through walls?

Using resilient channels on ceilings is a recommended practice to prevent sound flanking through walls. Resilient channels create a decoupling effect between the framing and the ceiling membrane, which helps to reduce sound transmission by minimizing the direct path that sound waves can take through structural elements. They work by allowing the ceiling to "float" slightly, which helps to absorb and dissipate sound energy rather than transferring it directly through solid materials.

This method is especially effective in multi-family residential buildings or spaces where noise reduction is a priority, as it addresses both airborne and structure-borne sound issues. By implementing resilient channels, the acoustic performance of a space is significantly improved, contributing to a quieter environment.

The other practices proposed, while they may serve their own purposes in construction, do not directly target the flanking transmission of sound as effectively as resilient channels do.