Abstract
Mass timber construction is an increasingly common way of building taller and larger wood buildings utilizing renewable building materials with lower embodied carbon. Given the desire for the aesthetic design of exposed mass timber ceilings, it is common for these mass timber panels to require an additional subfloor decoupled by an acoustic interlayer to achieve IBC 1207 requirements. In the efforts to minimize added structural weight and overall embodied carbon, various dry linings were tested as an alternative to traditional cementitious toppings. A 175mm cross laminated timber (CLT) panel was constructed in the laboratory, and numerous ASTM E90 and ASTM E492 tests were performed. This analysis examines the role of dynamic stiffness of the acoustic interlayer and various mass layers in the resulting performance. Assembly transmission loss data from ASTM E90 testing are assessed to understand if it agrees with mass law.
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