Measuring guide for Bifolding Doors

Instructions on how to measure the opening for your doors

It is vital that the opening you have prepared is structurally sound, measured carefully, square and symmetrical.

The opening
The aperture must have a relatively flat and level bottom, with vertical sides and a solid head structure. If the bottom and the top surface are level, and the vertical sides perpendicular then your resulting opening will be square. You can also measure from corner to corner – if these figures are the same then your opening is square.

The height and width
When completing the height and width fields, take 3 or 4 measurements (depending on the size of the opening) every 500mm-750mm from the exterior of the building (where the door frame is usually positioned) from the blockwork, brickwork (or foundation/slab where on which the bottom track will sit). The results should be identical if perfectly square, but if not, provide us with the smallest figure.

If you have any questions, feel free to give us a call. We will confirm all sizes before your doors go to manufacture as it is vital that measurements are accurate. We cannot take responsibility for inaccurate measurements so ask us or check with a professional if you are a homeowner/self-builder.

The diagram below will help and you can download our full installation guide here if required.

STEP 1: Take at least three height measurements across the width of the aperture, if unequal use the smallest figure

STEP 2: Take at least three width measurements across the height of the aperture – if unequal use the smallest figure
just aluminium measuring guide for bifolds

STEP 3: Check the aperture is square by measuring the two diagonals, which should be equal

check your aperture size for bifolds