|Single panel garage doors
Single panel doors are constructed from one monolithic panel. From the closed position a single panel door will slide up and overhead on rails to the fully open position. A disadvantage of monolithic panel doors is that the swing up arc of the door occurs partially outside the garage. This means a vehicle must stop and park several feet in front of the door to avoid being hit by the garage door when it is opened.
|Sectional garage doors
Sectional doors are usually constructed of six to eight panels and slide up and overhead. Sectional doors occupy exactly the same amount of internal garage space as a monolithic door. Sectional doors have two distinct advantages over single panel monolithic doors: - Sectional doors do not require any space outside the garage to open. A vehicle may park very close to the garage before opening the door. - Each panel of a sectional door has its own connection to the door track. This increases reliability and robustness compared to monolithic doors which have only a couple of track connections for the whole panel.
Insulation of Sectional Garage Door
Roller doors are usually constructed of corrugated steel. They evolved from cover window and door coverings. Other materials can be used (eg; 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.