BIFOLD DOOR THRESHOLD OPTIONS

Your new aluminium folding sliding patio door can be supplied with a choice of two threshold options. The weathered threshold is designed for external bifold doors and will normally sit on top of a projecting cill. The low threshold is ideal for internal doors, such as between your house and conservatory as it is only 30mm high and if necessary can be sunk into the floor to provide a flush floor level.

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Weathered Threshold

The weathered threshold should always be specified for bi-folds that are being used as external doors. The long leg(63mm)will face inside the building for doors that stack outwards and outside the building for doors that stack inwards. The most popular requirement is for folding doors that stack outwards to save space inside the room and it is usually possible to adjust your internal finished floor levels to achieve a minium step over threshold.

weathered threshold

Low Threshold

The low threshold can be used where your new bi fold door is being used as a room divider or for instance, between your house and conservatory. The threshold can be sunk into the floor to provide flush levels between the two floor areas. Designed primarily for internal use it may be possible to use this low threshold in sheltered external applications.

low threshold

Projecting Cill Options

Although it is possible to sit your new folding sliding door directly onto the brickwork most installations will require a 150mm or 190mm projecting cill both shown below:

optional projecting cills