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. The drawings below 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.
Threshold and cill drawings are here
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 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.
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 fitted into the head(top)of the outer frame and to ensure that they do not interfere with plaster lines we always supply a 20mm frame extension which is fitted to the top of the outer frame to move the trickle vents down and away from the plaster line.
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).
