Treforest Glass Slim, Low Sight Line, Double Glazed Units
Treforest Slim low sight units have a butyl hot melt primary seal around the edge of the unit, they should be treated for installation into timber frames as any other untaped double glazed unit.
If the units are not fitted correctly, this will dramatically reduce the life of the double glazed unit. It is therefore important that you adhere to these guidelines and those of the GGF regarding installation and ensure that the external glazing seals cannot allow any ingress of water, which is the main reason for failure of double glazed units in timber frames.
Do not tamper with the perimeter seal, nor allow the units to come into contact with any chemicals, particularly methylated sprits, nilglass or other alcohol based glass cleaner.
Units must be stored prior to glazing in cool dry conditions
Apertures must be dry before glazing. Units can be bedded on butyl putty, or can be bedded on a low modulus neutral cure silicone for example Silfix U9, or can be fitted onto an appropriate glazing tape.
You should allow a minimum space between the outside edge of the unit and the frame of 1.5mm – 2mm.
Setting/Spacer blocks may be used to locate and support the unit.
Face Puttying: Please ensure your putty does not contain Linseed Oil. All of the voids around perimeter of the unit must be gunned with compatible low modulus neutral cure silicone, or sealed with butyl putty, whichever has been used for bedding the unit. Please ensure that no water or contaminants can get between the silicone and the glass and contaminate our butyl seal. Please make sure you allowed time to for Silicone to cure, before facing up.
Timber beads: Timber beads should be bedded into low modulus neutral cure silicone, or an appropriate glazing sealant (check with manufacturer/supplier that it is acceptable for use with butyl sealed double glazed units) and the bead pinned in place.
As with all double glazed units, if you are applying the timber beads use glazing tape, it is very important that the bead joints and edges are silicone capped to ensure water cannot penetrate.