| Title |
Prediction of Airborne Sound Insulation in CLT Exterior Wall Systems According to Design Parameters |
| Authors |
장하은(Jang, Ha-Eun) ; 이정훈(Lee, Jeong-Hun) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.5.311 |
| Keywords |
Timber Buildings; Cross-Laminated Timber(CLT); Exterior Wall System; Airborne Sound; Sound Insulation; Acoustic Simulation |
| Abstract |
Cross-laminated timber (CLT) exhibits inherent limitations in airborne sound insulation performance due to its relatively low density combined
with high stiffness and orthotropic structural characteristics. Therefore, This study aims to quantitatively analyze the effects of key design
parameters on the airborne sound insulation performance of CLT exterior walls and to examine their sound insulation characteristics under
different wall configurations. To this end, the commercial acoustic prediction software INSUL was employed to estimate the one-third octave
band sound reduction indices of CLT exterior wall systems. Based on a reference CLT wall configuration, variations in surface density,
cavity arrangement, and the application of decoupling elements resulted in distinct frequency response characteristics. The weighted sound
reduction index (Rw) increased to a maximum of 66 dB with increased surface density and multilayer wall configurations, and further
improved to 73 dB when resilient channels were applied. These results confirm that, through the application of appropriate composite wall
design strategies, CLT exterior walls can achieve efficient airborne sound insulation performance relative to their mass. |