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FAQ

What are U-Values?

The U Value of a door is used by Architects to design the thermal performance of an overall structure, which in part includes the door and frame. The heat loss from buildings is affected by many attibutes including the wall design, roof design and window and door designs. The main areas are those with the biggest surface areas so the design of walls and roof insulation are the main factors, but door and windows do play a part. Building Regulation Part L requires windows to meet a minimum requirement of 1.8w/m2K and doorsets are also 2.0w/m2K. However, better performing products might be specified by Architects as part of the overall building design to meet a particular building design standard, and sometimes windows are specified at 1.6w/m2K.

The higher the U value of a product, the lower the level of thermal insulation - hence the greater the heat loss. So in essence high U values mean worse performance. Within our range of doors we do offer some doors at a U value of 1.8, which is very good for a timber door, but Climadoor is known for best use of the most effective materials of construction and we offer double glazed external bifold doors down to 1.3W/m2K, French Doors down to 1.5W/m2K and single leaf external oak doors down to 1.7W/m2K. A great team of products to work with!

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