Open Access
Table 7.
Roof sound package structure.
| First layer | Second layer | Third layer | |
|---|---|---|---|
| Acoustic package | Gradient airflow resistivity PU 20 mm | Sound-absorbing cotton 10 mm | Acoustic felt 3 mm |
| Acoustic package 4 | Gradient airflow resistivity PU 30 mm | Acoustic felt 3 mm | |
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