Abstract
The use of timber constructions recently increased. In particular, Cross Laminated Timber floors are often used in multi-story buildings. The development of standardization processes, product testing, design of details and joints, the speed of construction, and the advantages of eco-sustainability are the main reasons why these structures play a paramount role on the international building scene. However, for further developments, it is essential to investigate sound insulation properties, in order to meet the requirements of indoor comfort and comply with current building regulations. This work presents the results obtained by in field measurements developed using different sound sources (tapping machine, impact rubber ball, and airborne dodecahedral speaker) on Cross Laminated Timber floors, changing different sound insulation layering (suspended ceiling and floating floors). Results clearly show that the influence on noise reduction caused by different layering stimulated by diverse noise source is not constant and furthermore that no available analytical model is able to correctly predict Cross Laminated Timber floors acoustic performances.
Highlights
At present, the need of sustainable buildings is rising all over Europe and their construction is growing quickly [1]
Timber frame is used for the construction of walls [5,6] and Cross Laminated Timber (CLT) for floors [7,8]
In order to investigate the influence of different layers on bare CLT, three different noise excitation sources were used: dodecahedral speaker for airborne noise generat5ioofn1,7 ISO tapping machine for heavyweight impact noise generation, and rubber ball for lightweight noise generation (Figure 7)
Summary
The need of sustainable buildings is rising all over Europe and their construction is growing quickly [1]. Timber frame is used for the construction of walls [5,6] and Cross Laminated Timber (CLT) for floors [7,8] In this light, CLT horizontal partitions have to fulfil many requisites like structural integrity etc., but recently sound insulation and impact noise reduction as well as indoor acoustic comfort are becoming important issues to manage. The suspended ceiling acts as an added layering, namely another and different impedance from the bare floor It constitutes a sound insulating element laid between the source (vibrating floor) and the receiver (room). It constitutes a sound insulating eleFmigeunrtel4a.idCobnefitgwuereantiotnhe2:sBoaurercfleo(ovricboruaptilnedg wfloitohrs)uasnpedntdheedrceecileinivge. In Tab9le 1, different layers used70a0nd tested are reported, descri1b1ing their thickness, density, an1d00elasticity
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