Sliding Door U Values Explained

U values measure how effective a material is an insulator.
Sliding door u values explained. Energy efficiency explained when talking about patio doors the u value refers to how efficiently the window glass the door as a whole keeps in heat. For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. Nfrc u factor ratings however represent the entire window performance including frame and spacer material. It s usually expressed in units of btu hr ft2 of.
The lower the u value is the better the material is as a heat insulator. The lower the u factor the more energy efficient the window door or skylight. It is typically used as a measure of heat loss from inside your home to the outside and could be a measure of thermal performance for your walls roof and floors as well as your aluminium windows and doors. In simple terms the lower the u value number the better the thermal performance of the window.
The better it is at doing this the better rating it will have. U values are measure in watts per square metre kelvin or w m2 k. U values are generally used to describe the thermal performance heat loss for a section of construction that involves several materials such as a wall made up of timber insulation and plasterboard. U values are used to determine the insulating efficiency of the window and all of its components.