Double-leaf walls built from concrete blocks are widely used to separate dwellings, providing good acoustic and thermal insulation. Keeping the two masonry leaves separate helps limit noise transmission, while adding insulating and sound-absorbing material in the cavity further enhances acoustic performance. The blocks may be made from concrete, lightweight concrete or clay, offering flexibility in construction and long-term durability.

Clay brick walls are a long-established feature of traditional construction, especially in regions where clay is readily available. The mass of the brickwork helps limit airborne noise transmission, while the two leaves of a double wall work together with the intervening cavity according to the mass-spring-mass principle, enhancing acoustic performance.