But eventually there will come a day when it can absorb no more. It will be saturated, and then there will be free water between the panes, which will form as mist on the glass. How long this takes depends upon the quality of the materials and workmanship. In ideal circumstances the sealed glass unit will be mounted in drained and ventilated recesses in the window frames, positioned on special setting blocks, and with spacers at intervals around the edges to support it when the window is opened or subjected to wind loads.
But when this is not done, the resulting stresses on the glass can break the seal. Units fitted into timber windows using ordinary putty or oily mastics can also fail quickly, as these dry out the sealant and cause it to crack.
When the seal is broken, any water collecting at the bottom edge of the glass will find its way through and saturate the desiccant. And once these double glazed units mist up inside there is nothing — but nothing — that can be done to remedy it.. Thousands of windows in hundreds of homes already have this problem, and the numbers are set to grow. Do the boffin s at the DETR know about this — the ones who are madly promoting the use of replacement double glazing in existing buildings?
So whilst you cannot change where you live or your climactic conditions it is important to find a supplier that uses the best materials and ensures the perimeter seal is well protected from water. All of our standard casement and sliding sash windows are manufactured with an internally beaded system, which is mastic capped externally. This prevents water from reaching the glazing rebate. We also integrate a drainage channel in the base of the glazing rebate, as a secondary defence against water pooling.
And of course we use the best materials available, which come to us with performance warranties. See some of the key differences in our products here. We are so confident in our glazing techniques that our sealed units on standard products come with a full 10 year guarantee against failure, which includes both the material cost of the unit and the labour cost of the replacement.
This is significantly better than other guarantees in the marketplace. As such, companies will typically provide a warranty of years, depending on the manufacturer. Over time, double glazed windows may incur some wear and tear and all manner of minor damage, such as gas-filled insulated glazing unit slowly, gradually leaking. The Center for Sustainable Energy comments:.
The Center for Sustainable Energy. Want to know more? And of course, the ravages of time can take its toll on your double glazed windows as well.
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