Acoustic Performance

The Weighted Sound Reduction Index (Rw) is a number used to rate the effectiveness of a soundproofing system or material. Increasing the Rw by one translates to a reduction of approximately 1 decibel in noise level. Therefore, the higher the Rw number, the better a sound insulator it will be.

For projects where noise is a concern, acoustic glazing (including acoustic glass) can help improve overall sound insulation in acoustic windows and soundproof windows. The following test results demonstrate the sound reduction index of various Westbury products in accordance with BS EN ISO 10140-2:2010. Each result is followed in brackets by an adjustment (C,Ctr). These are figures you deduct for an accurate reduction index of pink noise (C) and Traffic noise (Ctr), helping you compare sound reduction windows more accurately.