Secondary Glazing Subframe Details
Our Subframe system wraps the aluminium frame of the window with a wooden subframe. The wood used is either MDF (Medium Denisty Fibreboard), Luan (a dark hardwood) or Tulip (a pale hardwood). The subframe comes in two depths, either a slim SF1 or a deeper SF3. Cover trims are supplied with all subframe secondary glazing to cover fitting srews. Most subframe secondary comes with pre-drilled holes for quicker installation. MDF frames are pre-primed in white, Luan subframes come unfinished and Tulip subframes can either come primed white or unfinished.
The pictures below show the difference between the SF1 and SF3 frames. SF1 is designed to screw directly to your existing windows (known as face fixing), whilst the SF3 subframe is designed for screwing to the wall slightly away from your existing window. The SF3 system can also be mounted direct to your existing windows where the extra depth is useful for keeping your new secondary glazing away from existing window handles. When installing secondary glazing it is preferable to have a gap between your secondary and your existing window of around 100mm glass-glass. This gap further improves both the acoustic and thermal performance of your secondary unit.
