This module introduces the technical specifications and sound insulation performance requirements of building material systems for domestic and non-domestic constructions.The module employs a mix of regulatory text, graphical visualisation, technical drawings and site inspection evidence to demonstrate:• where specifications and materials appear within the building construction, • why these elements are designed and constructed in this way to the relevant regulatory and technical standards, • construction procedures and sequence of events to combine these elements into a technology,• how the components and systems perform in relation sound insulation criteria for domestic and non-domestic constructions.The module profiles the building’s design and specification to contextualise internal, separating and party constructions. Methods of acoustic assessment and measurement procedures are also included and type of test equipment involved. The module also embeds the basic principles of acoustic transmission, direct, indirect, resonant and critical frequencies and the technical compatibility factors with other building regulations for design, construction and performance.