| Written by Cavan A Sullivan Sometimes known as “misting”. Water between the panes of glass that cannot be cleaned. Desiccant (Very often found in bags when buying cameras electronics etc). When double glazed units are first made there is a substance called desiccant put inside the spacer bar that separates the two panes of glass. This is there solely for one reason, that is to dry out any moisture inside the unit when it is first made.
Once this has been achieved the desiccant has completed its job and is not used to dry out water that enters the unit at a later date, as many people think. Double glazed unit breakdowns. Units break down for a number of reasons. 1/ Poor manufacturing process, inferior or poor quality edge sealants.
Units should be manufactured to BS 5713: 1979 (1994) Specification for hermetically sealed flat double glazing units.
Particular care should be taken when replacing units that they comply with BS 6206: 1981 (1994) Specification for impact performance requirements for flat safety glass and safety plastics for use in buildings.
Windows that had been replaced after July 2002 must have an insulating glass to comply with new Part “L” regs. 2/ Incorrect drainage
Quite often I come up across units that have no drainage.
Others are drained inside and outside, but the drain holes do not meet up causing the water to sit in the bottom channel. This is a major cause of unit breakdown. If the unit constantly sits in water this is eroding the sealant and will reduce the life of the unit dramatically.
Older PVCu windows used to have far less drain holes than today. We very often add additional drain holes before refitting the units. 3/ Incorrect packing or incorrect packers. The units should sit on packers to lift the unit of the bottom and therefore above the water that drains into the bottom channel.
Packers ideally should be at least 5mm. We prefer 7mm or more.
Packers used on the bottom should be bridging packers if they take up the full width of the bottom chamber. These have a slot through the centre to allow water to run through.
If your packers are 6mm or more short of the width of the bottom chamber, you can use normal packers if bridging packers are not available. Replacement of double glazed units by Welsh Window Systems. We do not simply take one unit out and replace with another as many companies do. We replace units with new manufactured to BS- to BS 5713: 1979 (1994) and glaze to BS 6206: 1981 (1994) Specification for impact performance requirements for flat safety glass and safety plastics for use in buildings. We check for insulating glass and replace with this if needed. We carefully check to see if there is drainage, if it is incorrect or insufficient we will drill new holes where needed.
We fit new packers if needed.
There is no extra charge for the above.
By carefully and professionally fitting your units we personally give a Five year warranty. This is a very realistic warranty and providing our manufacturer is still in business there can be a further Five year warranty with them.
Pleased do not be tempted by someone who just offer a ridiculous warranty as quite often
these guarantees can often be as much use as a “Chocolate fireguard”. Written by Cavan A Sullivan | 
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