You need one width kit plus one height kit of the appropriate lengths
to secondary glaze your window with two sliding panes.
SELECTING YOUR GLAZING MATERIAL
Do not buy the glazing material until you have installed the outer
tracks and have taken the required measurements from them.
This system had been designed to accept 4mm glass or acrylic sheet.
4mm glass generally gives the better result, but if your window is
close to the floor or otherwise exposed to impact, we recommend that
you use acrylic or similar material instead of glass for safety reasons.
No single pane should exceed 12 sq feet in area - check metric
The uPVC Vertical Sliding System may be fitted:
1. To the inside of the wooden recess
2. Directly to the flat wooden face of the window surround
In each case allow a minimum of 42mm of the flat surface to accept
the secondary glazing tracks.
Face fitting may not be possible if:
1. The main window does not have a wooden frame or surround
2. The main window catches do not clear the secondary glazing
panes, and cannot be replaced by smaller fittings, or otherwise
Also it may not be desirable if the best sound insulation is required.
A gap of 150mm between the main window glass and the secondary
glazing is recommended for this.
For the best thermal insulation, and for normal sound insulation
purposes, fit the secondary glazing as close as possible to the existing
window. Ensure that the main window catches clear the secondary
When recess fitting to brick, concrete, plaster etc., mark the position
for drilling the holes through the screwholes shown in Figure 1. Then
drill the holes deep enough to take the plastic wall plugs, to ensure a