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Recognition structure particularsBottom crashing sound interception structure thickness Concrete slave thickness Bottom crashing sound interception structure composition material Over 278mm Over 150mm [hypocaust floor (over 8mm)] [cement mortar (over 50mm)] [air board PTE TYPE (over 50mm)] [wale buffing material (over 20mm)] [concrete slave (over 150mm)] Bottom crashing sound interception performance (second grade)Structure Bottom crashing sound (single dimension evaluation quantity L'n, AW/Li, Fmax, AW) Low weight standardization bottom crashing sound (dB) Heavy weight Bottom crashing sound (dB) PTE-180 (test 1) 45 48 PTE-180 (test 2) 47 51