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Cross-laminated timber (CLT) is widely appreciated for its fast installation, sustainability, and lightweight properties. However, its high sound radiation efficiency makes it particularly susceptible to flanking transmission. At the same time, its aesthetic appeal often leads architects to leave surfaces exposed, avoiding additional linings.In standard design solutions, suspended ceilings are commonly installed to limit direct vertical sound transmission from the floor above while also concealing building service installations. This study explores an alternative strategy that introduces a resilient layer between floor elements to reduce lateral sound transmission between adjacent rooms via the upper floor.An experimental campaign was carried out on a horizontal X-junction mock-up. First, the vibration-reduction index (Kij) was measured on a continuous floor slab. The slab was then divided into two sections, separated by a resilient material, and the Kij for the floor-to-floor transmission path was measured again.The results demonstrate that floor decoupling with resilient material is an effective strategy, particularly at low and high frequencies, achieving improvements of up to 8 dB in the single-number Kij. The performance of this solution was further assessed through calculations in accordance with ISO 12354, based on the experimental data. These findings highlight new opportunities for acoustic design in CLT structures.