Treforest Glass Slim, Low Sight Line, Double Glazed Units

Installation Guidelines

 Basics

Treforest Glass Slim Sight Line double glazed units use Edgetech’s ‘Heritage’ 4mm warm edge spacer bar – the best warm edge spacer bar on the market – with a hotmelt sealant. They can therefore be installed into timber frames in the same way as any other untapped insulated sealed unit. As they are untapped it is particularly important that they are stored in dry conditions, preferably off the floor, prior to glazing. Any ingress of water to an insulated sealed unit will make it unfit for use. Again the units should not be allowed to come into contact with any chemicals, particularly methylated spirits, or alcohol based glass cleaners.

Fitting

If Treforest Glass Slim, Low Sight Line, double glazed units are fitted correctly they will give many years of problem free service. If they are fitted incorrectly they are likely to break down within the first year or two of fitting.

Timber frames must be dry before they are glazed and the units should be bedded on either a suitable glazing tape; butyl putty or a low modulus neutral cure silicone. We would recommend spacer blocks to locale and support the units and a minimum space between units and frame of 1.5mm either side.

Timber beads should be fitted using a suitable glazing tape bedded into a low modulus neutral cure silicone or other glazing sealant that is suitable for use with butyl sealed units, and then pinned into position. For a long life, all bead joints and edges should be silicone capped to ensure water tightness.

We do not recommend face puttying with Linseed oil putty, as it can dry out and crack, allowing water in. However, if face puttying with linseed oil putty, it is first necessary to seal the unit in position with either the butyl putty or low modulus neutral cure silicone that was used to bed the unit. The edge of the unit should then be sealed with either the butyl putty or low modulus neutral cure silicone and allowed time to go off prior to face puttying with linseed oil putty.