Doors and Windows Glazing Secondary Glazing

Secondary Glazing – Questions Asked

Which Glass type should I choose?

Secondary glazing is normally specified to combat 2 main issues; acoustic or thermal performance. In conjunction with the air cavity, the type of glass specified plays a vital role in rectifying your issue. As standard, all of our products are manufactured with 4mm toughened glass for enhanced security and safety. (Please be aware that other secondary glazing providers may supply float glass which is brittle and can be easily broken. If broken, it can leave large dangerous shards, often resulting in injury).

Sound – Selecting the correct glass and installing the secondary glazed unit with an air cavity of 150mm to 200mm, can drastically reduce noise issues by up to 80% (54 dB). Most traffic noise problems can be rectified with the installation of either 6.4mm or 6.8mm clear acoustic glass. Where noise is a real nuisance, and loud in nature, we suggest the specification of 8.8mm clear acoustic glass.

Thermal – Cold draughts breaching your primary windows can make a room feel uncomfortable and makes it uneconomical as the loss of heat will result in higher energy costs. Where thermal performance is required, we advise the installation of either 4mm, 6mm or 8.8mm clear laminate low E glass. Low E glass has a specifically designed coating that reflects heat waves back into the room thus keeping your it warm in the winter, and cool in the summer.

The type of glass specified can increase or decrease your quoted price. It is best practice to speak with us directly as you may over specify the glass type. We can provide a tailored solution to rectify your issue which is both cost efficient and practical for your specific requirements.

How to Achieve the Best Thermal Performance?

Draughty windows can make a room feel uncomfortable and will result in higher energy costs as heat is escaping. Secondary glazing, with either 4mm, 6mm or 8.8mm Low E glass, can reduce heat loss by up to 65% and instantly prevent draughts. We often recommend the installation of Low E glass as it has a specifically designed coating that reflects heat back into the room.

For optimum performance, we recommend that the secondary glazed unit is face fixed to the interior side of your primary window with an air cavity of no more than 80mm. Secondary glazing will decrease the amount of heat loss when installed with single, double or triple glazed timber or uPVC windows.

You can have your secondary glazed units manufactured  with or without a hardwood subframe. We advise the installation of a hardwood subframe as this acts as a thermal barrier, preventing the aluminium frame and glass cooling due to the temperature of the fabric of the building.

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