Sound insulation that reduces transmission of impact sound between buildings or parts of buildings. Impact sound is direct impact on a building element. This is generally footfall.

• Design Advice for new-build or converted properties to improve the sound insulations. Airborne sound may transmit directly from one room to another or indirectly via the flanking elements. e.g. In the case of two rooms separated by a floor it may transmit via the floor itself or via the walls which “flank” the two rooms. Hence offering advice in this area is an important and specialist area.

• Pre-completion Sound Insulation Testing for properties in accordance with the requirements of Document E. Testing involves measuring noise levels in a lower room which are due to the operation a “tapping machine in the room above.