Ever settled in for a good night’s sleep only to be rudely awakened by that annoying strip of light peeking through the top of your curtains?
You’re not alone. Learning how to block light from top of curtains is a common challenge for many homeowners and renters alike.
Whether you’re a shift worker needing daytime darkness, a light-sensitive sleeper, or simply someone who values privacy, those persistent light gaps can be truly frustrating.
In this guide, I’ll walk you through five practical, budget-friendly solutions that actually work. No complicated installations or expensive custom window treatments required—just simple, effective methods to finally achieve the darkness and privacy you deserve.
By the time you finish reading, you’ll have all the knowledge you need to transform your space into the serene, light-controlled environment you’ve been dreaming of.
Why Light Leaks Through the Top of Curtains
Before diving into solutions, let’s understand why this problem occurs.
It happens because standard curtain rods don’t sit flush against the wall. This gap lets sunlight stream in even when curtains are closed.
Most curtain hardware is designed for easy opening and closing, not complete blackout coverage. The space between rod and wall creates that perfect path for light to sneak through your otherwise darkened room.
Window frames often have irregular shapes or aren’t perfectly level. These small imperfections create tiny openings where light finds its way in, especially noticeable in early morning or late afternoon.
Your curtain length might be perfect, but the height placement matters too. When rods are mounted too low or curtains aren’t tall enough, that frustrating gap at the top becomes your morning alarm clock.
5 Proven Methods on How to Block Light From Top of Curtains
1. Install a Cornice Board or Valance
A cornice board is a decorative box-like structure mounted above your window that conceals the curtain rod and blocks light from the top.
How to implement:
- Measure the width of your window plus 4-6 inches on each side
- Choose a material (wood, foam board, or fabric-covered options)
- Mount it 4-5 inches above your curtain rod
- Ensure it projects out from the wall far enough to cover the curtain rod completely
This solution not only helps block light from top of curtains but also adds an elegant design element to your room.
2. Use Ceiling-Mounted Curtain Tracks
Unlike traditional curtain rods, ceiling tracks allow your curtains to hang flush with the ceiling.
How to implement:
- Purchase ceiling-mounted curtain tracks from home improvement stores
- Measure and mark your ceiling for installation
- Use a stud finder to locate secure mounting points
- Install the tracks according to manufacturer instructions
- Hang your curtains from the ceiling tracks
This method is ideal for rooms where you want to block light from top of curtains completely while maintaining a contemporary aesthetic.
3. Add a Blackout Curtain Header
A blackout curtain header is an additional strip of blackout fabric that extends above your regular curtains.
How to implement:
- Cut a strip of blackout fabric slightly wider than your window
- Attach it to the back of your curtain rod using hook-and-loop tape or clips
- Position it to cover the gap between the rod and the ceiling
This affordable solution specifically targets the problem of how to block light from top of curtains without requiring a complete curtain replacement.
4. Use Magnetic Strips or Velcro
For a non-permanent solution that’s easy to implement:
How to implement:
- Attach one side of magnetic strips or Velcro to the wall above your curtain rod
- Attach the corresponding side to the back of your curtains
- Press the curtain against the wall to secure it and block light
This method is particularly helpful for renters or those who don’t want to make permanent modifications to block light from the top of curtains.
5. Install Window Frame Blockers
For stubborn light gaps, consider adding specific blockers designed for the window frame itself.
How to implement:
- Measure the gap size at the top of your window
- Select appropriate materials based on gap size
- Clean surfaces thoroughly before application
- Apply according to product instructions
Bonus tip: Combine this method with other solutions for maximum effectiveness to block light from the top of curtains completely.
Additional Tips for Complete Darkness
To maximize your light-blocking efforts:
- Layer your window treatments: Combine blinds or shades with curtains for double protection
- Choose the right curtain length: Opt for floor-length curtains that puddle slightly for fewer light gaps
- Use curtain clips: Attach clips along the sides of curtains to secure them to the wall
- Consider the color: Darker colored curtains block light more effectively than lighter ones
Conclusion
Learning how to block light from top of curtains can dramatically improve your sleep quality and room ambiance.
Whether you choose a decorative cornice board, ceiling-mounted tracks, or one of the other methods outlined above, now you have multiple options to tackle this common problem.
Remember that the best solution depends on your specific windows, budget, and whether you own or rent your home. You might even combine several methods for optimal results.
Take measurements of your windows today and decide which method works best for you.
With a small investment of time and money, you can finally achieve the darkness you desire and enjoy uninterrupted sleep.
Frequently Asked Questions
Why does Light Still Come Through My Blackout Curtains?
Even blackout curtains can let light in at the edges. The fabric itself blocks light, but gaps around the sides, top, or bottom create pathways for light to enter your room.
How do I Measure for Curtains to Block Light Properly?
Measure your window width and add 8-12 inches on each side. For height, measure from 4-6 inches above your window to the floor for maximum coverage.
Are Curtain Rods or Tracks Better for Blocking Light?
Tracks generally block light better than rods because they sit closer to the wall. Ceiling-mounted tracks especially help eliminate that troublesome gap at the top.
Can I Block Light From the Top Of Curtains Without Drilling?
Yes! Tension rods placed higher up, removable hooks with clips, or magnetic blackout solutions can all work without permanent installation or damage to your walls.
