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Frequently Asked Questions

What is Storm Glazing?

Common sense and best practice dictates, storm glazing should be guaranteed to be water proof, wind and rain proof, a barrier to our severest weather conditions, storm proof guaranteeing there will be no on going future damp problems. Ethically, unlike other companies, we must give that information and if Art Glass is given a contract involving storm glazing we can provide glazing solutions that give that guarantee.

Proper storm glazing is maintenance free and designed to prevent water penetrating behind the glass also preventing condensation forming on internal surfaces of vulnerable stained glass plus lowering the temperature of the lead in the windows. It must be considered nothing less than the primary weather shield for the building.

Storm glazing should not to be confused with other now fashionable forms of glazing, Secondary Glazing which provides a lower level of protection for leaded windows and the buildings in which they are installed. This glazing is on brackets and comes with 6mm or 8mm gaps all round the glass. Therefore there will be water and wind penetration on to stained glass. Water penetration will produce very damaging processes “ghosting” and “corrosion” which can leach calcium from the glass surface causing the dark pigments in the design to be lost from the stained glass. Art Glass if required can supply secondary glazing fitted with Stainless Steel, Bronze, Chrome, or Zinc/Copper brackets. Examples can be seen in balustrades, baloneys, shower rooms and frameless screens fitted by Art Glass in various locations over the past thirty years.

So what is the problem?

There are totally preventable repercussions with the installation of flawed applications of glass on old and listed building, these may include, water penetration, the rotting of wooden frames, fouling of internal finishes, the sealing of dampness into the building, condensation and or long term damage to leaded and cast iron windows and vulnerable surfaces of stained glass, these problems must always be expected and the glazing must be a design solution.

What type of glazing is needed?

The environment around the window must be water and condensation free.
To achieve this, the joint between glass and stone on the exterior of the windows in particular must be guaranteed to prevent water penetration. The only way to achieve a long term barrier to all severer weather conditions is with a small profile frame. This small frame is critically important because it can be fully bedded when screwed to joints in the window surrounds providing a water proof seal also at critical points water proof vents should be fitted into the frame. All metal used must be of the highest quality and none Ferris or a high grade stainless steel.

Seems simple; that can’t be all?

For aesthetic reasons the frame is better if it is as slim as possible and the same colour as the lead in the window. I am recommending that at all times only international conservation guidelines are put in place and only procedures which follow best practise are implemented as recommended by the C.V.M.A, which can be sourced from their web site and the Heritage Council of Ireland’s ‘Caring for Stained Glass’ Guidelines.

Taken from the C.V.M.A website Monday 24-06-2013

“The installation of a protective glazing system is a crucial part of the preventive conservation of architectural stained glass, which is vulnerable to both mechanical and environmental damage. The principal aims of a protective glazing system are to relieve the stained glass of its function as a weather shield, to protect it against mechanical and atmospheric damage, and to prevent condensation on the surface of the stained glass. Every window installation is unique, and therefore the design of its protective glazing must take into account the particular preservation needs of the stained glass and its architectural setting, as well as the physical and aesthetic impact on the building”…………………………………..



For more information on storm glazing for stained glass conservation in Londonderry, Northern Ireland, contact us today on:

028 7135 7555

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