Curtain rail

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Plastic curtain rails are cheap & easy to fit round curves, but tend to deteriorate over decades, with fixings breaking. This article describes their fitting and repair, and how to hang curtains neatly.


|____________--__--_____________|  rail
 '  '  '  '         '  '  '  ' ||
    hook     closers           ||  pullcords
   hangers                     ||
                               oo  handles

          Front view

   __           __          __
 _|__|_________|__|________|__|_  wall fixing blocks
|_______________________________| pulleys at each end for pullcords
        Bird's eye view

Curtain rail centre 4790-3.jpg

Rear rail view above shows

  • the 2 closers, one hooked on each cord run
  • curtain header tape has 3 rows of loops, giving 3 possible curtain positions

Curtain hooks 4919-3.jpg

Curtain hook, 2 sizes of rail sliders, & a wall fixing

Rail types

Curtain rail sliders 4921-3.jpg

There are 2 main types of plastic rail. One type has grooves moulded along it, and little runners that move along this groove, as shown on the right. The little runners tend to break over many years, so its a good idea to fit more of them than are needed. This rail type looks neat, so can be used left on view, with the curtains hung under it, should this be wanted.

The 2nd type uses much larger runners, pictured on the right, that wrap around the whole rail. The middle 2 items in the yellow picture above are these type of runners. The runners are unclipped by lifting them, and pulling the bottom out forwards. These runners are much more robust than the above type, and easier to replace if damaged. But they're not neat if left on view when the curtains are closed.

Curtain rails are also supplied straight or coiled. Coiled rails must be kept straight in use by the wall fixings, and this puts a fair bit of force on these fixings. Since these fixings are prone to break in time, the situation is worsened with coiled rail. The advantages of coiled rail are that it goes readily round corners, and that it comes in longer lengths than is practical with straight rail.


Make sure you use enough wall fixings to ensure the track lays flat and is well supported. Ensure you have a wall fixing right at the end if you're using a pullcord.

Take care to cut rail ends accurately straight, it really makes a difference to final appearance.


Sometimes a fixed rail is fitted above the door - this works, but is inconvenient, as the curtain interferes with door opening. A rail fixed to the door doesn't work well either, it fails to cover the door top, and the curtain can get damaged at the bottom. The solution is a curtain rod that lifts up as the door opens. These are called portiere rods.

Hanging Curtains

This is often done badly, creating a poor appearance. The main thing is to space the hooks out evenly along the length of the curtain. To do this, count the number of hanging loops on the curtain and divide by the number of hangers & hooks you have minus 1. This makes the curtain hang evenly. For a good result there should be a hook every 3-4 loops in the curtain tape. Much wider spacing doesn't hang well.

The opening ends of curtains are a weak point with both curtains and hooks. Avoid damage by fitting 2 hooks next to each other at each end of each curtain (in neighbouring loops in the curtain header tape).

Curtains have 3 rows of hanging loops so you can set them at 3 different heights. Pick the one that gives the best appearance at both top and bottom.

  • Thick curtains can hide the rail completely if hung on the highest setting
  • Thin curtain flop over at the top if hung high
  • Pick the setting that causes the curtains to just clear the windowsill or floor if possible. The closer the curtain bottom is to the cill or floor, the better the curtain insulates.

When pullcords are used, fit the centre ends of the curtains so the curtains overlap enough when closed. Its common to see curtains hung on the wrong holes on the sliding closers so that the closers show when the curtain is closed, or worse so the curtain isn't fully closed. It often works better to hang the curtain from the 2nd fixing loop rather than the end one, to hide the closers.

Curtains are usually wider than the window, and string threaded along the curtain tape is pulled and tied to give bunching. Often the spacing of the loops along this tape becomes uneven in use. To tidy this up, lay the curtain flat, hold at one end, and pull parts of the header tape where needed away from the held end so as to even the loop spacing out. A few pulls here & there soon evens it all up.

Troubleshooting & Repair

Some repairs to these rail systems are simple, and quicker and easier than fitting a new rail.

Rail fixings

Curtain rail fixing 4919-4.jpg

These can break or get lost in storage. Replacements can be got from curtain rail sellers, some haberdashers, another curtain rail kit of the same type, or ad hoc fixings can be used.

Ad hoc fixings

Adhoc curtain rail support 4794-2.jpg

Any ad hoc replacement fixing must not obstruct the sliding channel used by the hook hangers and closers. This is typically the lower of the 2 channels in plastic rail systems.

1" metal corner braces work. Drill a pilot hole into the top of the rail, and screw in there using a cranked screwdriver. These can be used as temporary repairs, or permanent where no-one looks too closely.

Broken closers

Plastic closers sometimes break. Often these can be repaired using 2mm iron wire attached to whatever remains, to take up the function of the lost part. Make sure the position of the wire holds firm and doesn't flop, and that nothing fouls. Sometimes ensuring these can be fiddly.

Closer string tabs broken

The pullcord typically goes over 2 tabs on the closers, and these can snap off. Just tie the string to somewhere on the closer with a bit of 1.6mm iron wire. Wrapping the pullcord round the iron wire makes for a firmer hold. If there's really nothing to tie to, drill another hole in the closer and use that.

Hooks break

Curtain hook 4919-4.jpg

Caused by any of:

  • not enough hooks being used
  • not using 2 hooks at the opening end of each curtain for greater strength
  • stiff rail mechanism needing excessive force - take it down & clean out the rail channels & hook hangers - water and detergent works
  • sometimes just weak deteriorating hooks. Replace any weak ones that see force, ie the end ones.

Replacement hooks are widely available at £1 or 2 for 100. If you come across metal hooks off an old metal rail, keep them. Unlike plastic ones, they last for life.


Clean out the sliding channel on the rear of the rail. Any surface dirt makes them behave badly, clean it thoroughly but don't use anything abrasive. an old toothbrush is helpful.


Curtain rail centre 4790-3.jpg

Arrangement at the centre of the rail, with one sliding closer on each cord

Pullcord rails have a single cord that goes over a little pulley at the left end (in the above pic). The 2 cord ends then each go over a pulley at the right end. This means there are 2 cord runs traversing the rail; one sliding closer hooks onto one of these cord runs, and the other sliding closer hooks onto the other. Now pulling one cord at the right end closes the curtains, and pulling the other opens them. The cord is very cheap (around 20p a metre), and available from haberdashers (sewing shops).

Curtain rail pull 4795-3.jpg

Curtain rail pull assembled like so, the bottom cover snaps on.

When restringing, check the following points:

  • the cords don't cross over or wrap round each other
  • cords and other parts don't foul
  • the free cord ends are both a suitable length, both when open and when closed

Pullhandles knock things over

Curtain pulls 4895-3.jpg

Supplied pullhandles can be replaced with something much lighter and smaller. You can use pretty much anything, hollow thermoplastic is ideal because it hides the cord knot, is light and unbreakable, and doesn't mark the wall. On the right the original pulls were replaced with bottletops.


Parts are still available for most curtain rails decades old. The main challenge is finding the shop that stocks them :)


New Swish rail parts fit old rails, but a slight difference in the depth of the slot in the rail means new bits need a shave off one edge to fit in. New Swish wall fixing brackets are a different shape, and foul moving parts if in the wrong position. The rotating fixing in them fits the old fixing brackets.

Reusing rails

Old removed rails typically need a clean and have some broken hook hangers. They can be cleaned, cut & reused as smaller rails, or the parts from 2 such rails used on one rail. Clean the rail completely rather than just the visible face, dirty channels run stiffly.


  • Aluminium rail, longer lived, same principles, and a bit more expensive
  • Curtain rod, wood or steel, & rings
  • Curtain wire & cafe rod to hang nets, but not curtains

See Also