Development of multiple drywall with high sound insulation performance

Experimental studies for the development of multiple drywalls with a high sound insulation performance are performed. Firstly, a means of preventing the sound insulation deterioration due to the coincidence effect at high frequencies is investigated by layering two plasterboards with different physical characteristics. Based on the results, a double drywall with a sound insulation performance of Rw = 61 is developed. Further more, a double drywall of Rw = 64 , a triple drywall of Rw = 86 and a quadruple drywall of Rw = 90 are developed.