Roller Doors
Roller doors are usually constructed of corrugated steel. They evolved from cover window and door coverings. Other materials can be used (e.g.; transparent corrugated fibreglass) where strong impact resistance is not required. Corrugations give the door strength against impacts. A typical single car garage roller door will have a preloaded spring inside the rolling mechanism. The spring reduces the effort required to open the door. Larger roller doors in commercial premises are not sprung and use a manual pulley and chain system or a geared motor to raise and lower (roll up and roll down) the door. Roller doors cannot be effectively insulated.
In the UK (and other parts of the EU), 'insulated' roller garage doors are available, using an aluminium lathe which is then foam filled, which not only adds thermal but acoustic insulation.
In terms of thermal insulation, the roller door has a typical U value of 4.9 to 5.2. A sheet steel garage door has a typical U value of 6.1 to 6.4. For 'real' thermally insulated garage doors, you would strongly consider the insulation values of a foam filled sectional garage door, which has a typical U value of 2.7 to 1.3.
Read more about this topic: Garage Door
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