Measuring Guide
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.
Product Data
- Panel material: 3mm PETg – UV
- Panel size: Up to 2m2 max
- Fire resistance: Class 1 BS 476 Part 6
- Magnetic material: Multi-polarized Ferrite
- Tape widths: 12.5mm or 20mm
- Adhesive to tapes: TESA
- Outline colours: White or Brown
- Total thickness of panels: 8mm, which “stand off” any surface by 5mm.
- Weight of each assembled panel per 1 sq. metre: 4kgs
Noise Reduction
In a controlled test, measuring sash windows facing a busy road before and after the addition of Magneglaze, a 10.4dB reduction was achieved. A 10dB reduction effectively halves the noise level perceived by the human ear.
Find a copy of the detailed acoustic report.
Cleaning & Maintenance
1. Hot spots in direct sunlight facing South
It is advisable to remove these panels during the summer months and store away safely. Store in the original packaging in an upright position. Temperature in the cavity can rise to 50C which is not good for the Acrylic or the TESA adhesive.
2. Prevent magnet fusion
From time to time go around and free off panels that are permanently in position. The power of the magnets continuously pulls the two surfaces together, so lift a corner, separate all round and replace.
3. Magnet polarity
At installation, each panel is unique to itself and the window frame. If any panel is removed, it must be replaced in the exact same original position.
4. Dust or blemish build up
Clear Cast Acrylic is brighter than glass. We can supply a plastic cleaner and anti-static polish that keeps your panels in sparkling condition. Please ask for details.
5. Condensation
Residual condensation may occur for a short time if your window frames were damp when the product was installed. Over a long period, moisture can be absorbed into the woodwork from outside due to gaps or damaged putties. It then becomes trapped in the cavity and has nowhere to go.
6. Guarantee
If the above care is taken, and installation guidelines adhered to, there will be no degradation of the Clear Cast Acrylic itself due to UVA/UVB penetration, or any lessening of the magnetic attraction.
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.
