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.
While a wooden French door is normally constructed to be very sturdy, you will want to make sure that the wood that is used for the doors construction is kiln dried. This will ensure that the exterior side will hold up to whatever weather it has to endure. With most French doors, you will not have to worry too much about a door cracking or shrinking; but, you will need to apply either coats of paint or stain from time to time. The next type of french patio doors you will likely find are vinyl doors. These types of doors are perfect for people looking for an easy to maintain French door. A vinyl door is a very durable door and will likely last you a great many years. However, you will need to take caution as these doors are at risk for scratches and even dents.
Remember, when it comes to hardwood patio doors, you dont have to settle for the same old look everyone else has. In fact, its a good idea to do some online research and look at some photos of wooden doors, which can be a big help when youre trying to decide what you like best. To keep maintenance to a minimum, you can have the wood treated with a weatherproofing formula that protects the wood finish. This allows you to enjoy your patio and those stylish doors for many years to come.
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