SCIENTIFIC PAPERS

AMC together with FCBA implemented and tested different configurations of wall and floors including smart joints able to decreases coupling in structural junctions. The aim of this project is to develop acoustically optimized innovative constructive solutions, based on CLT panels, which fulfil acoustic, thermal, environmental quality and cost performance objectives.

This study explores the efficacy of various structural noise insulation systems implemented in the construction of pilot houses made from Cross-Laminated Timber (CLT). Focusing on both vertical and lateral transmission, the research aims to evaluate the performance of different insulation methods in mitigating structural noise within these innovative wooden structures. The investigation involves a comprehensive testing regimen to assess the impact of insulation systems on noise reduction, considering both practical applications and theoretical considerations.

Suspended ceilings are often used to improve the sound insulation between spaces and in room-within-aroom applications. Typically a suspended ceiling system consists of three components: 1) one or more layers of building boards, 2) a ceiling frame for the installation of the building boards, and 3) a suspension system, i.e., ceiling hangers that attach the ceiling frame to the load bearing floor structure. Commonly used building boards in suspended ceilings are plasterboards or wood-based products (e.g. plywood), and the frame consists of steel or timber profiles.

In 2023, vibration reduction indices (Kij) were measured on four junction types using a three-story CLT mockup called “Maquette Acoustique Bois”. The study used Statistical Energy Analysis (SEA) to evaluate flanking transmission reduction with smart junctions. Results can be applied to the EN 12354 standard model. Findings highlight the effectiveness of resilient channels and dampers, suggesting future prediction methods should rely on experimentally measured Kij values for optimized acoustic performance.

Sound insulation performance of timber floors with elastically mounted and suspended layers This study compares the sound insulation of CLT floors using traditional screed versus elastically mounted toppings and suspended ceilings. Field tests and simulations showed that elastic systems improved vertical sound insulation by up to 23 dB (DnT,w) and 36 dB (L’nT,w), and also enhanced horizontal performance. The findings highlight the acoustic and environmental advantages of elastic mount solutions in timber buildings.