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A restaurant terrace asks a door to do two different jobs. During service, staff need a predictable route between tables. On a warm afternoon, the operator may want the dining room to feel connected to the entire terrace. Choosing a door only from its closed elevation can miss that distinction. Before deciding on finishes, map how the opening will work when it is partly open, fully open and closed for the evening.

The 68 Thermal Break Bifold Door folds panels towards one or both sides. The 65 Middle Narrow Sliding Door offers a sliding arrangement with a stainless steel lower rail. Both belong on an early project shortlist, but they answer different layout questions. A useful comparison starts with the operator's busiest hour rather than the largest possible opening shown in a photograph.

Draw the panel stack before placing the tables

With a bifold arrangement, the folded panels need an allocated position. Mark that position on the floor plan and show the panel movement leading into it. A table may fit comfortably beside the closed frame yet interfere with the first panel as it turns. The same problem can affect a planter, a host station or a terrace screen. Leave the operating area visible on the furniture plan so it survives later layout changes.

The 68 system offers configurations with two to eight panels as standard, with larger arrangements considered individually. Panels can fold to one side or both sides, and inward or outward configurations are available. These choices alter the relationship between the door and the dining area. Ask for a configuration drawing that identifies the stack depth and remaining passage for the exact opening; those dimensions are more useful than a generic photograph of a fully folded installation.

Separate everyday access from the full opening

A terrace is rarely either completely open or completely unused. Staff may need to carry trays through a narrow passage while most of the glazing stays closed. The 68 bifold can include an independent traffic door within the assembly. For a restaurant, that option deserves attention at the quotation stage because it changes how often the whole folding set has to move during a shift.

For comparison, draw the 65 sliding door in its normal service position and in its maximum open position. Show which panels move, where they overlap and where people pass. Sliding panels travel along the opening instead of making the same folding movement as a bifold set. The remaining opening depends on the chosen track and panel layout. A project with a fixed service route may favour that predictable movement, while an operator seeking a broad seasonal opening may prefer the folding format.

Resolve the threshold with the surrounding floor

The threshold is part of the terrace design, not a detail to postpone until the doors arrive. Put the indoor finished floor, outdoor finished floor, track and adjacent drainage on the same section drawing. This gives the architect, supplier and installer a shared reference when discussing how people cross the opening and how the assembly meets the terrace surface. It also exposes conflicts with finishes before they become installation work.

The 68 product offers different opening directions, with threshold and floor track selection tied to that choice. The 65 specifies a stainless steel lower rail and a listed single-panel bearing capacity of 180 kg. Treat that capacity as a parameter for the proposed assembly, alongside glass weight and panel dimensions. Ask the supplier to confirm the final combination rather than using one component figure as approval for any door size.

Compare a complete glazing and hardware package

Thermal break profiles are only one part of the order. The 68 is offered with double or triple insulated glazing and options including low-E and tempered glass. For a fair quotation comparison, give both proposed systems the same project brief: opening dimensions, exposure, desired glass appearance and the information the design team needs to assess performance. Otherwise, a price difference may reflect different glazing or hardware rather than the door format itself.

For a busy venue, also discuss the parts people touch and operate every day. Confirm the traffic-door arrangement, handles, locking points, roller or hinge specification and access for maintenance. Request drawings of the selected hardware positions. A handle that looks unobtrusive in an elevation still needs to work beside the adjacent wall, folded panel or furniture in the actual layout.

Send a quotation brief that supports a decision

A productive enquiry includes the finished opening width and height, quantity, preferred finish, proposed panel arrangement and a marked floor plan. Add the operating priorities in plain language: daily staff access, maximum summer opening, available stacking area and the intended terrace use. Include the delivery destination and required installation window so production and transport can be discussed together.

Choose the 68 when its folding arrangement and optional traffic door solve the terrace brief. Keep the 65 in the comparison when sliding operation fits the service route better. The final decision should be visible in the drawings: where the panels go, how people move and what the complete supplied assembly includes. That is the information a contractor can price, an installer can prepare for and a restaurant operator can use.