Comparison between calculated and measured performances of impact sound insulation for Cross Laminated Timber building elements Martino Marini D.A.D.U, University of Sassari, Sassari, Italy Roberto Baccoli D.I.C.A.AR, University of Cagliari, Cagliari, Italy Antonino Di Bella D.I.I. University of Padova, Padova, Italy Costantino Carlo Mastino D.I.C.A.AR, University of Cagliari, Cagliari, Italy Nicoletta Trulli D.I.C.A.AR, University of Cagliari, Cagliari, Italy Elisa Solinas G.F.T.A., Technical Physics Association, Cagliari, Italy Summary The use of simplified prediction models described in the EN 12354 series standard is largely diffused and suggested or adopted in many building codes. The aim of this work is to evaluate the reliability of calculation methods of impact sound insulation by comparison with in situ measurements. A case study about buildings made with Cross Laminated Timber (CLT) elements is presented. PACS no. 43.40.Kd, 43.55.Ti 1. Introduction 1 A wider and wider spread of timber structures entail a stronger and stronger use of of these building elements in Mediterranean weather environments. CLT technology is nowadays taken in consideration with special attention on account of the various benefits that it can allow in terms of shortened time of laying and attainable performance. The aim of this work consists of evaluating passive acoustic requirements with specific attention to impact sound insulation. The aspects of impact noise transmission and its theoretical foundations is considered in detail for instance in [1]; as the floors in hollow brick and concrete are concerned experimental analyses were carried out and calculation models were developed with particular focus to the Italian building types [2,3,4,5]. The analysis was arranged in several steps, starting from the prediction of the performance given as opposed to structure-borne noise [1] for CLT floors, evaluated according to EN 12354 [9] standards; the second step concerned the performance, as measured in situ following ISO 140 [6,12] standards, the last phase has been devoted to the comparison among the values drawn from the prediction by calculations and those obtained from in situ measurements. Throughout the development of the present research several constructions, made with CLT and located in the Mediterranean area, have been analyzed; it has been possible to carry out in situ measurements for those elements during their construction, concerning just the structural floor and then on finished floors at completion of construction works. 2. Architectural elements and methodological approach Copyright© (2015) by EAA-NAG-ABAV, ISSN 2226-5147 All rights reserved 2503