Restring Guide

This practical guide walks through how to restring a Roman blind from start to finish,
covering the tools needed, the step-by-step process, and tips for sourcing quality
roman blind components and cord replacements.

Replace Cords

Roman blinds are one of the most elegant window covering options available,
but they rely on a cord system that is subject to wear over time.

The lift cords run through a series of rings stitched to the back of the fabric,
pass over cord rollers at the top of the blind, and connect to a locking mechanism
that holds the blind at the desired height.

With regular daily use, these cords stretch, fray, and eventually break —
usually at a point of high friction such as a cord roller or a ring stitched at
a slight angle.

When a cord breaks, the blind loses its ability to fold evenly, and one side
will hang lower than the other or collapse entirely.

The good news is that restringing a Roman blind is a straightforward repair
that most installers can complete in under an hour, requiring only basic tools
and the correct replacement roman blind components.

Tools Needed

Before starting the restringing process, gather everything you need so the repair
can be completed without interruption.

The tools required are minimal — a pair of scissors, a tape measure, a bradawl
or small pointed tool for threading cord through tight spaces, and optionally
a lighter or heat sealer to prevent synthetic cord ends from fraying.

The materials you will need are a length of replacement cord in the correct
diameter — typically 1.0mm, 1.2mm, or 1.4mm polyester cord — plus a cord lock
or cleat if the existing one is worn, and any cord rollers needing replacement.

Always measure the total cord length required before ordering replacement parts.

A simple way to calculate this is to measure the full drop of the blind,
multiply by the number of cord columns, and add an extra 30 to 40 percent
for the horizontal run across the top and the operating tail.

Materials Checklist

• Polyester lift cord — correct diameter for your blind system

• Cord lock or cleat if replacement is needed

• Replacement cord rollers if worn or damaged

• Scissors and tape measure

• Bradawl or threading tool

• Heat sealer or lighter for cord ends

Remove Blind

The first step is to take the blind down from its mounting so that you can work
comfortably on a flat surface.

Most Roman blind tracks clip or slide into wall brackets, and the blind can be
removed by pressing the release tabs while supporting the blind with your
other hand.

Lay the blind face down on a clean, flat surface. A large table or clean floor
works well so that the cord rings and existing cord runs are visible.

Take a photograph of the existing cord routing before removing anything,
as this will serve as a useful reference when threading the new cord.

 

Remove Cord

With the blind laid flat, locate the cord lock at the top of the blind and
release it to free the existing cords.

Pull the old cords through the rings from the bottom of the blind upward,
removing them one column at a time.

If the cord has broken partway through, remove both sections — the piece below
the break and any remaining cord threaded through the upper rings and rollers.

Inspect the cord rings on the back of the fabric as you work.

If any rings are loose, misaligned, or pulling away from the fabric,
they should be resewn before the new cord is installed.

A faulty ring will cause the new cord to wear prematurely at that point.

Also inspect the cord rollers at the top of the blind.

Rollers showing visible wear grooves or that do not spin freely should be
replaced while the blind is already off the track.

Prepare Cord

Cut the replacement cord to the correct length for each column,
adding the extra allowance for the horizontal run and operating tail.

If you are using synthetic polyester cord — the recommended choice for Roman
blinds because it is durable and non-stretch — seal each cut end briefly with
a lighter or heat tool to prevent fraying.

This small step makes threading significantly easier and prevents the cord from
catching on rings and rollers during installation.

If the roman blind components being replaced include the cord lock,
install the new lock into the track before beginning the threading process.

This is much easier while the blind is still off the wall.

Thread Cord

Starting at the bottom ring of the first cord column, tie the new cord securely
to the lowest ring using a double knot.

Thread the cord upward through each ring in the column, keeping the cord snug
but not tight against the fabric.

At the top of the column, pass the cord through or over the cord roller and
continue horizontally across the top of the blind toward the cord lock.

Repeat this process for each cord column, threading all cords through their
respective rollers and bringing them together at the cord lock.

The cords should all exit the lock at the same point and be gathered into a
single tail for operating the blind.

Threading Tips

• Work one column at a time to avoid tangling

• Keep consistent tension across all columns

• Use a bradawl to open tight ring loops

• Check each cord passes over its roller correctly

Rehang Blind

With all cords threaded and secured at the lock, hold the blind up by the track
and pull all cords gently to check that tension is even across all columns.

If one side rises faster than the other, the cord in that column is too short
and should be adjusted before fixing the tail length.

Trim all cords to the same tail length — typically 30 to 40cm below the blind
when fully lowered — and seal the cut ends.

Reattach the blind to its wall brackets, test the full range of operation
several times, and ensure the blind folds evenly at each pleat.

If the blind has been correctly restrung, it should rise in even horizontal
folds and hold its position without slipping.

Components

The quality of the replacement cord and components used in a restringing job
has a significant impact on how long the repair lasts.

Polyester cord is the preferred material for Roman blinds because it does not
stretch under load, maintains its diameter over time, and resists UV damage.

Avoid cotton or mixed-fibre cords, which stretch with use and cause the blind
to lose level operation relatively quickly.

When sourcing roman blind components for professional use, work with a
specialist blind hardware supplier that can provide cords in the correct
diameters and lengths, along with matching locks, rollers, and rings.

This helps ensure a reliable and consistent supply of parts for ongoing
maintenance work.

Professional installers should keep stock of the most common cord diameters
and cord lock types, as these are the components most frequently required for
both repairs and new installations.

 

FAQ

Cord Size

How do I know what diameter cord to use when restringing a Roman blind?

The correct diameter depends on the size of the rings stitched to the fabric
and the cord rollers at the top of the blind.

The most common sizes are 1.0mm, 1.2mm, and 1.4mm.

If unsure, measure the internal diameter of the rings and choose a cord that
passes through easily with a small amount of clearance.

Wall Removal

Can I restring a Roman blind without removing it from the wall?

It is possible but not recommended.

Working on a flat surface gives better visibility of the cord routing and makes
it much easier to maintain even tension across all cord columns.

Removing the blind usually produces a better result in less time.

Cord Life

How long should replacement roman blind cord last?

Quality polyester cord used in a residential Roman blind should last several
years under normal daily use.

Cords exposed to high UV levels or poorly aligned rings will wear faster.

Replacing worn cord rollers at the same time will significantly extend the
life of the repair.

Cord Difference

What is the difference between roman blind cord and standard blind cord?

Roman blind lift cord is specifically designed to be non-stretch and maintain
a consistent diameter under load.

Decorative cord or packaging string is not a suitable substitute because it
stretches over time and causes uneven operation.

Parts Source

Where can I source roman blind components for professional repair work?

Specialist blind hardware suppliers, including manufacturers based in Taiwan,
offer a comprehensive range of roman blind components.

These include polyester cord in multiple diameters, cord locks, cord rollers,
rings, and mounting hardware.

Establishing an account with a reliable supplier helps ensure consistent access
to the parts needed for ongoing professional repair and installation work.