The sound-reducing effect of a window depends on its construction and the size, sash, frame and joint sealing. Therefore, it is important that any acoustic test is conducted of the entire window element and not only the glass. Windows need to be sealed both the inside and outside and the gap between the frame and the wall must be filled with approximately 3 times as much insulating material as in standard installations.
VELFAC has a large selection of sound solution and can provide test results for complete elements (frame/sash/glass).
As the simplest form of sound reduction, we recommend the use thicker glass or a combination of different glass types; A standard VELFAC triple-glazed unit achieves Rw33, which can be increased to Rw43 by using different types of glass and increasing the depth of the spacing profile. It’s also important to specify sound-reducing glass specific to noise type – traffic, trains or industry for example in order to optimise the performance of the unit.
The VELFAC acoustic trickle vent ensures both fresh air and noise reduction when combined with VELFAC SOUND windows.
The acoustic vent is installed into a timber packer, which is fitted and sealed on site and can achieve a sound reduction value of Dn,e,w (C; Ctr) = 40 (-1; -2) dB, and an equivalent free opening of 2868mm².
At VELFAC, we can help you achieve your project-specific acoustic requirements. Contact us as early as possible in your design process so we can provide test evidence and advise on the best solution for your project.
"When we advise on a specific project, we take into account all the relevant factors such as sound pressure on the façade, room size, reverberation time and the total window area. All these elements are supported by test documentation, so you can be sure the products you specify match the requirements of your project."
- Neil Edwards, Specification Consultant, VELFAC
Visit our technical product database to learn more about acoustic performance and test results for our VELFAC 200 Energy system.
- David Lomax, Senior Associate at Waugh Thistleton Architects