Do you struggle with unwanted light seeping in through the top of your curtains? Whether it’s streetlights, early morning sun, or a neighbor’s bright porch light, even a small gap can ruin your sleep or movie-watching experience. Fortunately, there are several effective ways to block light from the top of curtains—some simple, some more permanent.
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In this guide, we’ll explore practical and stylish solutions to keep your room as dark as needed.
Why Does Light Come Through the Top of Curtains?
Before fixing the problem, it helps to understand why it happens:
Poorly Fitted Curtains – If curtains don’t fully cover the window or aren’t wide enough, gaps allow light in.
Inadequate Curtain Rod Placement – Light leaks in if the rod isn’t installed far enough above or beyond the window frame.
No Top Sealing – Many curtains have an open top design, allowing light to slip through.
Now, let’s explore the best ways to fix this issue.
1. Use a Curtain Valance or Cornice Board
To block light from the top, a valance (a short decorative drapery) or a cornice board (a wooden box-like structure) can be mounted above the curtains.
How to Install:
Choose a fabric valance that matches your curtains.
For a cornice board, upholster it with fabric and mount it securely above the window.
Ensure it extends slightly beyond the curtain edges to prevent side gaps.
Pros:
✔ Stylish and decorative
✔ Blocks light effectively
Cons:
✖ Requires some DIY skills for cornice boards
2. Install a Curtain Rod with a Tight Fit
If your curtain rod is too close to the window or doesn’t extend wide enough, light will leak in.
How to Fix It:
Extend the rod at least 6-8 inches wider than the window on each side.
Use wrap-around curtain rods that curve toward the wall, sealing the sides.
Pros:
✔ Simple adjustment
✔ Works with existing curtains
Cons:
✖ May require reinstalling the rod
3. Add a Blackout Liner or Layer
If your curtains are too thin, a blackout liner can block light completely.
How to Attach:
Clip-on liners – Easily attach to existing curtains.
Sew-in liners – For a permanent solution, sew a blackout fabric to the back of your curtains.
Double-layered curtains – Use blackout curtains behind decorative ones.
Pros:
✔ Blocks 100% of light
✔ Improves insulation
Cons:
✖ May make curtains heavier
4. Use Magnetic or Adhesive Light-Blocking Strips
For a no-drill solution, magnetic or adhesive strips can seal the top gap.
How to Apply:
Magnetic strips – Stick one side to the wall and the other to the curtain.
Adhesive foam strips – Apply along the top edge where light enters.
Pros:
✔ Easy to install and remove
✔ Budget-friendly
Cons:
✖ May not work with thick curtains
5. Install a Ceiling-Mounted Track System
A ceiling-mounted curtain track eliminates gaps by allowing curtains to hang flush against the wall.
How It Works:
The track is installed on the ceiling, not the wall.
Curtains glide smoothly, sealing all edges.
Ideal for bay windows or rooms where wall space is limited.
Pros:
✔ Maximum light blockage
✔ Modern and sleek look
Cons:
✖ Requires professional installation in some cases
6. Use a Draft Stopper or Door Snake
A draft stopper (usually used for doors) can be placed along the top of curtains to block light.
How to Use:
Choose a long, flexible draft stopper.
Place it along the curtain rod or tuck it behind the top of the curtains.
Pros:
✔ Cheap and easy solution
✔ Also blocks drafts
Cons:
✖ May not look as polished
7. Opt for Top-Sealing Curtains (Grommet-Free Styles)
Some curtain styles (like tab-top, back-tab, or pinch-pleat) sit closer to the rod, reducing gaps. Avoid grommet-top curtains, as they leave more space for light.
Best Options:
Pinch-pleat curtains – Fit snugly against the rod.
Rod-pocket curtains – Enclose the rod completely.
Pros:
✔ More elegant look
✔ Naturally reduces light gaps
Cons:
✖ Limited style options compared to grommet tops
8. DIY Hack: Use a Towel or Fabric as a Light Blocker
For a quick fix, drape a thick towel or spare fabric over the curtain rod.
How to Do It:
Fold a dark-colored towel and lay it over the rod.
Pros:
✔ Instant solution
✔ No installation needed
Cons:
✖ Temporary and may not look stylish
Final Tips for Maximum Light Blocking
Combine multiple methods (e.g., blackout liner + valance).
Choose dark-colored curtains to absorb light.
Check for side gaps and use wrap-around rods if needed.
Conclusion
Light leaking through the top of curtains can be annoying, but with these solutions—whether DIY hacks, stylish valances, or blackout liners—you can enjoy a completely dark room. The best method depends on your budget, decor style, and how much light you need to block.
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