A visible "kitemark" on the glass is the consumers assurance that the double-glazed unit has been manufactured to British standards. The BSI has numerous standards, including: U-value verification, Window Energy Rating and Window Installation. The lower the U-value, the better the thermal performance and most local authorities will require this to be 1.8 or better to meet building regulations.
It is now easier to choose the style for your door because homeowners now have more choices. In the old days, most patios can do with any kind of door. Some even think that any door is good enough just as long as it closes and opens when you please it. Of course, if you want your home to be in style then you also have to make sure that the patio door style you choose should not go against your homes general theme.
And that is not all. Aside from giving houses with excellent exteriors, patio doors make the interior look elegant as well. Why? Because they are nearly made of glass and allow natural light to easily pass through them. Interiors with insufficient lighting look gloomy or dull. But with enough sunlight pouring in, the beauty interiors are greatly emphasized. So, they allow your home to look great not just on the outside but on the inside as well.
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