MEASURING YOUR BIFOLD DOOR APERTURE

The following is intended as a brief guide to determining the width and height of your bifold door. Note that it is good practice to view and sketch the door “as viewed from the outside”.

STEP 1

Check that your aperture is square by comparing the cross-corner dimensions.

STEP 2

Measure the width of your aperture in three different places. Take the smallest size and deduct 10mm to provide your width dimension.

STEP 3

To determine the height of your door you should first decide where your finished floor level will be, including any floor covering. Download the Threshold and cill drawings and decide on which threshold you require and if the door is to sit on a projecting cill or direct onto the brickwork. The drawings illustrate a stack inwards door using a weathered threshold and cill where the total available is 54mm from underside of cill. For a stack outwards door the threshold will be reversed and the maximum dimension available is 88mm from underside of cill.

For doors with a 30mm low threshold being installed internally 25mm can be sunk into the floor if necessary.

Now that you have determined where the cill (or threshold) will sit you can measure the height of the door from underside of lintel to underside of the threshold or cill. Take three measurements in different places and use the smallest dimension from which you should deduct 10mm.

STEP 4

Decide on the style (view styles) of your door and the position of any traffic door. On styles that provide a double traffic door you can specify which door leaf is to act as the master door. All our folding doors can be supplied to open in or out. The most popular option is opening outwards which maximises space inside the room.

STEP 5

Decide if your door requires trickle vents fitted. If the door is being installed into a new aperture it will usually require trickle vents to conform with current building regulations. If the door is being installed into an existing aperture trickle vents are not mandatory but recommended, especially if the door is being installed into a kitchen area.

Trickle vents are normally fitted into the top of the sashes where required. However, if preferred they can optionally be installed into a 42mm frame extender that is fitted to the top of the frame as shown in the image below.

Please note that trickle vents are only available in white, brown or black.

Black trickle vent fitted to Silver RAL paint finish bifold door(the outer frame extension can be seen fitted above).

silver finish