![]() 200mm is the optimum, but not all windows have that, so try to position the unit to maximise the space available. It is the glass to glass airgap that really boosts the performance and is why secondary glazing is so much better for soundproofing than double of triple glazing, just use as much space as your window structure will allow. ![]() This gap can offer more performance than the glass, so don’t be put off by an expensive acoustic glass, you can still get amazing performance with lower cost glass options. A minimum of 100mm+ gap is recommended, more if the space is available up to an optimum 200mm. The greater the cavity between them, the better the dampening effect of the combined window. Unlike sealed units, where the two pieces of glass are rigidly coupled together, the primary and secondary windows act as independent barriers to the transmission of noise. The gap between an existing primary window and the secondary unit makes a big difference to the level of noise insulation. We get calls constantly from people who have done just that and are very disappointed by the results and are back seeking a real solution, which alas will be more expense which could have been avoided had they gone straight for the secondary option. No matter what the double-glazing salesman my tell you, double or triple glazing is no match for secondary when it come to soundproofing, don’t spend a small fortune on replacing existing double glazing windows or glass with all the mess, hassle and landfill environmental impact. If you are unsure of the existing structure of a double glazed window, a 6mm or 6.4mm thickness of glass would be a good start point. This ensures the structure of the 3 panes is not uniform – this lack of uniformity improves sound wave dissipation. If fitting secondary glazing to an existing double glazed window to enhance acoustic insulation, it is important to specify a different thickness of glass. Secondary glazing can also enhance the acoustic performance of double glazed units. Secondary Glazing for Double Glazed windows? ![]() Watch our short video to hear the difference for yourself > A reveal fix is the option to select when there isn’t sufficient frame on the primary window to attach the secondary glazing unit. With the right specification of secondary glazing and acoustic glass, a reduction in excess of 50 decibels can be achieved, which can be 5 x times that of double or triple glazing (that’s a reduction of almost 80% of the noise entering a room). The wider the gap, the better the sound insulation – see the Acoustic Performance table. Secondary glazing reveal fix frame formats are attached to the side wall of the window reveal rather than to the face of the primary window, so the secondary unit can be positioned away from the primary window for optimum sound insulation. Secondary glazing is the most effective solution for reducing intrusive noise through glazing. Traffic, street and aircraft noise adversely affect living and working environments, causing unwanted stress, a lack of concentration and worse. ![]() Unwanted noise is a problem in many homes and commercial buildings, particularly in towns and cities and period properties with original single glazing. Enjoy enhanced acoustic insulation with Clearview secondary glazing.
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