Threshold GUIDE for our Folding Sliding Doors

 

Before starting to measure the aperture, it is important to understand where the doors are to be fitted particularly with relation to the finished floor levels. If the aperture is existing you may wish to consider alterations to the levels if you want to achieve a minimum threshold relative to the finished floor levels.

The standard ClearSpan threshold can be set so that there is a minimum threshold height in relation to the finished floor level. If required the external floor can be set level to the internal floor and in this case consideration must be given to the provision of adequate external patio drainage.

Option 1: The standard threshold is 75mm high (as shown below).

Option 2: For where there is a external step down from the doors you may choose to add a projecting cill to cover external brickwork, this cill sits under the standard threshold raising it by 20mm.

Option 3: For a completely flush-level finish a 55mm threshold is available but this is not guaranteed for weather tightness and should only be used in a sheltered location.

Detailed dimensioned drawings of all the threshold options can be downloaded below.

With existing apertures an easy way to determine the difference between the outer brick level where the threshold will sit and the internal floor level is to place a spirit level across the aperture from outside to inside and take measurements to the internal floor and to the bottom of where the threshold will sit:-

Image 1- Standard threshold (showing outward opening option)

Recommended variation between the outside threshold position to inside floor level is 40mm, (maximum is 75mm)

Outside floor may be set level with Inside floor where the variation is 55mm or less.

 

Click here for Inward Opening Rebated Threshold Section Drawing

Click here for Outward Opening Rebated Threshold Section Drawing

Click here for Inward Opening Rebated Threshold, with Cill Detail, Section Drawing

Click here for Outward Opening Rebated Threshold, with Cill Detail, Section Drawing

Click here for Low Threshold Section Drawing for Outward and Inward Openings

Click here for Low Threshold, with Cill Detail, Section Drawing for Outward and Inward Openings