Measuring Guide – Sash Windows (2 panels)

These video tutorials guide you through the process of accurately measuring sash windows. The first video provides a quicker guide, for more detailed instruction please watch the second video.

Leaving room for the magnetic strips

For a sash window with two panels, the magnetic strips are 20mm wide on the three outer sides of each panel, and 12.5mm on the side that meets the centre meeting rail (see videos). You need to allow for this in your measurements.

There must be a flat shoulder on four sides so the panel is flush all round. Any ‘window furniture’ must be contained in the recess between the inner and outer panes of the window.

IMPORTANT: PANELS MUST ALWAYS HAVE A GAP OF AT LEAST 2MM BETWEEN EACH ONE. THEY MUST ALL BE SELF-SUPPORTING ON THE MAGNETIC TAPE. THEY MUST NEVER CLASH WITH A HARD SURFACE.

About the Centre-Meeting Rail (CMR)

Please note that we do not supply CMRs. Their profiles will be unique to your windows and will have to be fabricated on site.

• The centre-meeting rail (CMR) is a wooden batten which coincides with the top bar of the lower sliding sash. Fix with countersunk screws.
• The CMR width will be 25mm. Its depth will vary depending on the depth of the staff bead and the surrounding box frame. This profile must achieve a flush finish to extend beyond the staff bead (see below for diagrams showing the staff bead).
• The 12.5mm magnet edges butt together at the mid-point of the CMR.
• Install the lower panel first, with its top in line with the mid point of the CMR. Follow standard DIY installation guide.

Recognising the Staff Bead

Use the following diagrams to help identify the staff bead on your sash window:

The staff bead sometimes protrudes forward of the box frame. If this is the case, it must either be planed down, repositioned or packing pieces must be added around the perimeter.