How to calculate track length

A general rule of thumb when calculating track length is to calculate twice your door width, however this actually ends up slightly longer than required.  An accurate length can be calculated as described below.

What you need:

You will need to know your sliding door width (actual width of the door) and your opening width (inside edge to inside edge of the opening).

Track length calculation process:
  1. Determine your door width
  2. Determine ‘X’, your door overlap. This is the distance the door covers the wall on the inside edge. Hint: This is normally the width of architrave—see diagram below.
  3. Choose single or bi-parting setup
  4. Use the appropriate formula below to calculate your desired track length
  5. Select the closest track length from available track length options below. Note: If your track length is between two length options, select the longer track. Using a significantly shorter or longer length may restrict the use of a Soft Close kit. 

Track calculation formulas

Single Door

Bi-Parting Door


Available track lengths

Estrada stocks a range of track lengths, depending on your requirements. Your desired track length from 1.5m through to 4.8m can be selected during the ordering process. Track lengths outside of this range is possible, just get in touch with us.

How to determine your clearance 

Adequate clearance on any sliding door is crucial. Clearance will differ between each installation based on your door thickness and skirting or architrave dimensions.

Optional Clearance Spacer Kits can be used to increase the distance between your door and the wall to ensure the door is able to slide past any light switches, architrave, skirtings or other items protruding from the wall.

The required Clearance Spacer Kit is determined using Roller style, door thickness and skirting/architrave thickness

Recommended Clearance: = 10mm (Minimum = 8mm)

Use the table below to determine correct size Clearance Spacer Kit.
Note: Spoke Rollers have a narrow profile therefore standoff clearance is less than Flat & Curve Systems.



How to calculate your track fixing centre

The track centreline is where the track screws are fixed into the wall. To find this, simply add 50mm to the door panel height. This factors in the required clearance at the bottom of the door. 

Door guide install

Most doors will require a groove to run both our standard floor guide (included with all track roller systems) and adjustable wall mounted guide (optional). 

The best way to do this is with a router. A circular saw may also be used, however it can leave a rough cut resulting in noisy door operation.

If grooving your door is not a possibility, take a look at our alternative door guide options. 



Hole spacing

The hole spacing on each of our tracks is either 400mm or 440mm centres, depending on the track length. This provides a wide range of common track sizes.

If a track joiner is used the ‘End hole offset’ dimension is shown in the table below to determine the hole spacing across two tracks.

e.g  Total length: 2.8m (2 x 1.4m lengths) hole spacing is 400mm centres and 200 centres across the joiner (2 x 100mm).


GIB Inserts

GIB inserts are recommended for doors over 50kgs to eliminate sagging of the track system over time due to compression of the plasterboard.

These inserts are easily installed behind each standoff by drilling out a plug of gib using a 35mm spade bit (sold separately) and are available for both 10mm and 13mm plasterboard.