Internal Linings on Isolated Frames
This lining technique generally affords the greatest improvement in sound transmission loss. Two distinct framing types can be employed: fully independent or partially de-coupled. The latter type, of which there are many variants, allows for direct fixing to the background wall by a technique minimising vibration transfer between the base masonry wall and the applied lining board/s.
The performance of the lining system is primarily controlled by the following factors: mass of the applied lining board/s; the depth of the separation gap between the lining boards & the background wall; level of mechanical linkage and the thickness / type of sound absorbent material incorporated into the separating void. In addition, consideration should be given to the stiffness of the lining construction and dampening of the lining board/s to reduce ‘coincidence dip' (a phenomenon that reduces the sound transmission loss of a rigid board material for a limited section of the audio frequency range).
Given the variety of possible constructions and the large number of design factors to consider, we recommend that the specific condition is discussed with our technical department.
