Whichever system you choose, fit the double glazing as close as possible to your window for best heat insulation (a gap of ¾" is ideal). If your main concern is noise reduction fit it further away (up to 6" for best results).

Selecting Your Secondary Glazing Kits:

With the sliding systems you need a height kit and a width kit to complete a two-pane installation. Height kits contain all the the vertical sections for the double glazing. Width kits contain all the horizontal sections. The Fixed Pane Kit contains all the necessary sections in only one kit. All kits include free draught-proofing seals and step-by-step instructions together with all accessories and fitting aids such as screws and wall plugs. Having measured the height and width of your window recess simply select the nearest longer size.

Selecting Your Glazing Material:

The kits do not include glazing material which you should obtain separately from your local stockist or glazier. Fit the double glazing tracks first then take glass measurements from them.

The UPVC systems are designed to accept 4mm or 2mm glazing material.

4mm glass generally gives the best result but if your window is close to the floor or exposed to impact, for safety reasons we recommend acrylic sheet or similar material instead of glass.

Acrylic is widely available in 4mm thickness. On the Horizontal Sliding System 2mm acrylic can also be used in conjunction with a 2mm glazing kit. However, 2mm thickness acrylic is not recommended for use on the Vertical Sliding. Please observe the maximum sizes for each single pane given under each system handling.