A- Through frame B- Long fixing C- Short fixing
6.2 New Frame Preparation
When preparing the new frame, the following points should be followed:
• If fixing brackets are to be used, these should be firmly attached to the outer frame.
• If you are to screw through the main outer frame into the structure, then the glass in the appropriate fixed light must be removed. If the window is too heavy for convenient handling, the glass units may also have to be removed.
Choosing one of the longest beads first, a paint scrapper is pushed into the bead / frame joint at approximately the centre point. Apply force to lift the bead up and out, starting at the end of the next bead, the remainder can now easily be removed. Make a note of the positions of each bead to ensure correct positioning later.
6.2.1 Fixing Details
Frames can be fixed by any of the following methods. A minimum of 5mm clearance is required per side, to allow for packers at the fixing points, this will allow any movement in the structure etc.
Prior to installation of the frames the damp proof membrane must be checked to ensure it is undamaged and still effective, any making good of the aperture should also be done including prevention of any cavity cold bridging.
A low modulus silicone must be used as well as backing rods as and when required. Exterior fixing lugs should be secured by“ one-way” or other suitable screws. Expanding foam can only be used as an aid to mechanical fixings, and preventions must be put in place to stop any bowing of frames while being used.
Fixings should be at least as corrosion-resistant as BS EN 1670:1998 Grade 3 and should penetrate the substrate a minimum distance of 50mm.
Short Fixing Bracket
Long Fixing Bracket( available in various sizes)
Through Frame Nylon Anchor
Through Frame Fixing Bolt
Long Fixing Bracket( available in various sizes)
Through Frame Star Fix Screw
6mm Threaded Bar
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