You may have a room at the rear of your home not being used effectively. By installing a sliding glass door system could transform the room. There may already be a large window with a normal height window sill about 1 M or so above the floor. To install the new doors would involve cutting out the section of wall below the existing window down to floor level and removing the old window. This will create a bit of a mess and upset for a while but it will be worth it. Can you imagine all the additional light that will flow in effectively turning the room into a sun terrace. In addition the new doors will give you access to your garden or patio that can be enjoyed during the good weather times.
Now that you have decided to create the larger opening what doors should you fit. There are a couple of options. The first being a set of sliding patio doors. These consist of a pair of door panels that slide left or right on tracks within a surround frame. Since they slide left or right they are particularly suitable if space is a problem allowing swinging type doors such as French doors to fully open. The patio doors are quite often used in small openings up to say 3 M wide. Larger openings can be accommodated with these doors by using a triple track system incorporating 3 or more doors. The main disadvantage with these doors is that you cannot enjoy the full width of the structural opening. For example if a two door system is installed one of the doors will usually slide to the rear of the other allowing almost 50% useable opening. If a 3 door system all doors will slide to one side behind each other creating a two thirds opening.
The second option is a sliding and stacking door system. This system is more suited to larger structural openings. It comprises of a number of door panels hinged to each other across the structural opening to effectively form a glass wall. The doors are located on a track in the floor and when operating all the doors fold against each other and slide to one side. The stacked doors are then parked at the side creating the usable opening of up to 90%. This system can accommodate openings up 6 M.