There are numerous companies that manufacture double-glazed door and window units and supply them direct to installers and the general public. The advantage of ordering your double-glazing units from the manufacturers is that you can save money installing them yourself. Many of the big nationwide companies are very cagey about actually letting you know the cost price of the units before they install them. This is because they know that once you’ve found out what they buy them for; you’ll be less than happy about handing over thousands of pounds for installation.
Obviously you want to be confident that the units you buy have been well-built and will last. Reputable manufacturers offer guarantees from between ten years and a life time. You should also get a second guarantee form the installation team for the work that they carry out. It is possible to fit the factory sealed window units yourself, but you’ll need a good deal of experience and practical know-how; otherwise you could end up in a lot of bother.
Most manufacturers advertise their product range on the Internet or they can be contacted by phone and a brochure ordered. Today’s range of products is getting ever larger and because most laymen don’t know a reversible casement fastener from a hookbolt it’s worth getting some independent advice first. Think about: security, safety, longevity and of course… price.
In April 2002 UK double glazing manufacturing policy was given a shake-up when a new standard for thermal efficiency in windows came into effect. The previous U-value energy rating set for windows was 3.3. Under the new regulations a reduction to less than 2.0 is required to meet the levels of efficiency needed.
The aim of this legislation is to affect a major national reduction in heat loss from all housing in the UK. This will progressively reduce our dependence upon fossil fuels and help to protect the ozone layer from further deterioration. On a practical level this means more interaction with local government as all new windows must be certified as meeting these regulations. Hence it’s a good idea to only use manufacturers who are registered with the FENSA scheme.
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