How to Block Light From The Sides of Blinds

Abigail Sawyer | 28 Jun 2018 | Blackout

Do your blinds or shades let in light from the sides? In the window covering world, we call these “light gaps.” These gaps exist because blinds and shades can’t be made to fit perfectly tight to the sides of the window. Without this gap, the fabric or slats would scrape along the window frame when they raise and lower, causing damage.

Some windows have a vinyl border that overlaps enough with the window treatments to cover light gaps, but others can let in sleep-ruining beams of light. Light gaps are especially problematic on blackout shades where complete darkness is desired.

One solution is “tracks” that cover the gap and allow shades to slide up and down. You may have seen something like this on hotel window shades. Until now, these tracks were only available for expensive custom shades and not compatible with many other window treatments or aftermarket solutions.

Use Light Blockers to Cover Light Gaps

Many customers asked for an easy and affordable solution to cover light gaps on new or existing window treatments, so we created the new Light Blockers. Light Blockers are an L-shaped piece of plastic that goes in front of or behind your window treatments to block the part of the window that is not covered.

Light blockers come in a range of lengths and can be trimmed to fit your windows size. Just cut them with sturdy kitchen scissors or a hacksaw.

Installation couldn’t be easier – just peel the sticky backing and stick to the side of your window. Light Blockers should be placed as close to the window treatment as possible for maximum coverage.

Light Blockers can be installed in front of the product or behind. On some windows, a small amount of light may still leak through when the blockers are placed behind the treatment.

Experiment with the placement before you peel off the sticky backing, to find the best coverage for you. Keep in mind that placing the light blockers behind the shades allows them to be fully concealed.

When ordering, you can choose from 5 colors to coordinate with product hardware or match window trim.

Light Blockers are available in two coverage sizes – 1″ x 1″ and 1 1/2″ x 3/4″. The smaller size is best for cellular shades, and the larger works well for roller shades, which need more coverage.

What Window Treatments Work with Light Blockers?

Light Blockers are designed to be used with blackout shades to give complete coverage at the sides of windows.

Works best with:

Light Blockers CAN be used with light filtering shades to provide additional privacy or block beams of light entering through gaps. However, light will still enter through the shade material since it isn’t blackout. Some products like Pleated Shades and hobbled Roman Shades do not fit tightly to light blockers and some light can still leak in.

Less effective for:

Some products just don’t work with Light Blockers due to the way they’re installed in the window.

Not effective or compatible with:

Ready To Give Your Windows Complete Coverage?

Add Light Blockers to your next order, or order them now for existing shades. With prices from $17-$41 this inexpensive upgrade is worth giving your windows full coverage.

Need help finding the right fit for your window? Speak to a Designer for free at 800-505-1905.

  • About Author

    Abigail Sawyer is a Senior Social Media Specialist for She's a home improvement junkie who is currently restoring a 1972 cottage with the help of her husband and goldendoodle, Biscuit. Walking in the footsteps of Martha Stewart, she’s happiest when she’s crafting or whipping up a new recipe; although nothing beats curling up with a good book and some Girl Scout Cookies. Follow her on twitter + instagram at @whatabigailsaw