Sound Transmission Class and Impact Insulation Class Ratings for BTO Developments

Mr Murali Pillai asked the Minister for National Development whether HDB is minded to publish the Sound Transmission Class (STC) and Impact Insulation Class (IIC) ratings for their BTO developments to enable potential buyers to assess the structural soundproofing qualities of the units.

We are mindful that residents are concerned about the structural soundproofing qualities of their units. As such, acoustic insulation and performance of soundproofing are carefully considered when designing and developing Build-To-Order (BTO) flats.

The Housing and Development Board (HDB) uses drywalls for internal partitions which are of Severe-Duty grade, with a Sound Transmission Class (STC) of at least 45, which is above the STC of about 40, considered as suitable for residential units. Hence, all HDB flats meet the required quality and acoustic insulation and performance.