The increase in high density housing and building on brownfield sites close to city centres and industrial areas has resulted in a sharp rise in demand for windows which offer improved acoustic performance.

After rigorous testing of its timber windows range, JELD-WEN, one of the UK’s leading window manufacturers, now has extensive test evidence to support acoustic performance for over 50 of its timber window products.

Tony Pell, product manager for JELD-WEN, explains: “Acoustics is becoming increasingly important as part of planning requirements (PPG3) and Building Regulations (Approved Document E). The fact that we have test evidence to support our Stormsure, Vertical Sliding Sash and Hi-profile Combi ranges gives specifiers greater confidence that our windows meet with requirements for sound reduction. A high performance building with good noise control built in is a more attractive proposition and is now a major selling point in a property.”

The test evidence demonstrates that JELD-WEN’s acoustic-performance windows achieve sound attenuation of up to 37 (-1,-3) Decibels [Rw(C:Ctr)] for the whole window. The construction of the window consists of a double glazed unit with two glass panes, one of which is laminated with a specialised PVB layer. The PVB Layer helps improve the Sound Absorption properties of the laminated glass as well as increasing the window’s resistance to burglary and vandalism. This, combined with excellent weather sealing in JELD-WEN’s timber windows, provides a product with optimum sound reduction properties.

Tony Pell continues: “There are three ratings of sound frequency: Low (40 Hz TO 400 Hz), Medium (400 Hz to 1600 Hz) and High (1600 Hz to 20000 Hz). As noise behaves differently at different frequencies, it is important that sound engineers specify the correct frequency, plus the percentage of sound reduction required. This ensures we can supply the correct specification of window with the required performance.”

JELD-WEN recently released a Technical Guide to Timber Windows to simplify the specification of these products. The guide has an ‘acoustics calculator’ that provides vital support in selecting the relevant sound frequencies and the sound reduction required. Acoustic test certification is available on request.

For more information or a copy of the Technical Guide for Timber Windows contact the company’s dedicated window specialists on 0845 1222 890 or visit the website

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