Roller blinds are a versatile option for controlling light and privacy, but even a blackout roller blind can leave small gaps around the edges of the fabric. For rooms where reducing light leakage is particularly important, roller blinds with light-blocking channels offer a more enclosed alternative.
Installed within the window recess, the channels sit against the walls either side of the window, helping to close the gaps around the blind. Depending on the system, channels can also extend across the bottom of the blind.
What are light-blocking side channels?
Light-blocking channels are slim profiles fitted inside the window recess alongside a roller blind. Rather than allowing the fabric to hang freely, they help contain it within the sides of the recess.
There are two main configurations:
- L-shaped light blockers – fitted along the sides of the blind to reduce gaps at either edge.
- U-shaped light blockers – fitted along the sides and across the bottom, providing additional coverage around the blind.
The channels are designed to work alongside the blind rather than changing its appearance significantly, making them a discreet option for achieving greater light control.
Blackout roller blinds with light-blocking channels
For the highest level of light control, the fabric and the way the blind is fitted both matter. A blackout fabric prevents light passing through the material itself, while light-blocking channels help address the light that can enter around the edges. Combining the two therefore creates a more enclosed blackout solution than using blackout fabric alone.
This can be particularly useful in bedrooms, children’s rooms, home offices and media rooms, where unwanted daylight or glare can be more noticeable.
The amount of light blocked will vary depending on the window, blind, fabric and installation, so a completely dark room cannot be guaranteed. However, reducing the gaps around the blind can make a noticeable difference to overall light control.
Read more about our blackout blinds here.
Can roller blinds with side channels improve thermal performance?
Light control isn’t the only potential benefit. The closer fit created by side channels can also influence the thermal performance of a roller blind.
Independent testing by the British Blind and Shutter Association (BBSA) found that on a modern double-glazed low-e window, a roller blind with side channels reduced window energy loss by up to 22%, compared with up to 13% for a standard roller blind.
These results relate to specific products tested under controlled conditions, so they shouldn’t be considered guaranteed energy savings in every home. They do, however, demonstrate how the design and fit of a blind can influence its thermal performance.
When should you consider light-blocking channels?
Light-blocking channels are most relevant when blackout and light control are a priority rather than simply wanting an everyday roller blind.
They’re worth considering if you’re:
- Trying to create a darker bedroom
- Struggling with glare on screens
- Shading a particularly bright or sunny window
- Looking for a closer-fitting blackout and thermal solution
They can also be paired with motorised roller blinds, making larger windows or multiple blinds easier to operate.
Choosing the right roller blind
When choosing a roller blind, consider how much light you want to control and whether blackout or thermal performance is a priority.
The right combination of fabric, blind style and fitting will depend on your room and how you want to use it. For some windows, a standard roller blind will provide everything you need. For others, adding light-blocking channels can offer greater control over light while also contributing to the blind’s thermal performance.
At The Shutter Studio, our roller blinds can be made to measure to suit your windows and interior. If you’re considering roller blinds with light-blocking channels, our team can help you explore the available options and find the right solution for your home.
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