Single, double and two singles
A double opening can take one wide door or two single doors, and the choice is not purely aesthetic. One double door is a single mechanism to maintain and a cleaner opening to drive through. Two singles mean one door can stay working while the other is repaired, and each door is lighter, which is gentler on springs and motors.
Where there is a central pillar you have no choice. Where there is not, the width of the opening and the weight of the finished door usually decide it — beyond about 5 metres, a single door starts asking a lot of its springs and its top section.
Materials and what they suit
Steel is the workhorse: strong, well priced, available in a wide range of finishes, and the standard on most new installations. Its weak point is corrosion at the bottom edge where water sits, which is why the bottom seal and the floor level matter more than people expect.
Aluminium is lighter and does not rust, which makes it a sensible choice on exposed openings and on very wide doubles where weight is a concern. Timber gives the appearance people usually want on a period property, at the cost of real weight, seasonal movement and a maintenance commitment. Glass fibre sits in between — light, stable, and the most forgiving in a coastal or high-moisture position.
Automation, safety and load shedding
A new door should be commissioned with the automation, not have a motor added later as an afterthought. The motor is sized against the finished weight of the door including any glazing or timber, and the travel limits and force settings are set with the door already balanced.
Safety infrared beams across the opening are standard on every installation we do. So is battery backup — in this part of Johannesburg a motor without it means a door you cannot open when the power is out, which is exactly when you want to get a vehicle off the street.
The auto-reverse test is done in front of you: an obstruction placed under the closing door, the door striking it, and the door reversing. If it does not reverse cleanly, it is not finished.