Your 31 x 64 Faux Wood Blinds Are Leaking Light (And My Fix)

I was halfway through the second act of Dune when it happened. A laser-thin beam of Saturday afternoon sun sliced right across my OLED, perfectly bisecting Timothée Chalamet’s face. I had just spent two hours installing my new 31 x 64 faux wood blinds, and they were failing me at the one job they had: staying dark. If you have a mid-sized window, you probably know this pain. It looks fine from the street, but from the couch, it is a glare-fest.

• The Culprit: The 'motor gap' required for smart tilt wands.
• The Fix: Deep-set inside mounting and a 2-degree over-tilt automation.
• Hardware: 2-inch slats are mandatory for the overlap needed to kill light bleed.
• Software: Home Assistant or SmartThings to force the 'compression seal.'

The Annoying Light Bleed Problem No One Talks About

When you buy 31 faux wood blinds, you expect them to cover a 31-inch opening. Simple, right? Wrong. To get them to actually fit inside the frame, the factory trims them by half an inch. Then, you add a retrofit motor like a Sunsa or Tilt, which usually requires a tiny bit of wiggle room for the wand to rotate. Suddenly, you have a 1/4-inch gap on both sides.

Standing directly in front of the window, you might not notice. But sit at an angle—like on your sofa—and those gaps become glowing vertical bars of frustration. These 31-inch faux wood blinds are just wide enough that the slats have some weight to them, meaning if they aren't perfectly aligned, the light bounce off the white synthetic material actually amplifies the glare. It’s not just a gap; it’s a reflector.

Why This Specific Window Size Is So Tricky to Black Out

The 31-inch width is the 'uncanny valley' of window treatments. It is significantly more prone to light leakage than narrower 29 x 64 faux wood setups because the slat span is just long enough to allow for a slight 'smile' or sag in the middle if the tension isn't perfect. This sag pulls the edges away from the window casing.

Because 31 inch wood blinds (or their faux counterparts) use rigid PVC or composite, they don't have the flex of fabric shades. If your window frame is even slightly out of square—and trust me, every builder-grade house is—that 31-inch slat is going to hit a high spot on the frame, leaving a massive gap everywhere else. You aren't just fighting the sun; you're fighting geometry.

My Inside-Mount Depth Hack for Complete Blackout

To fix this, I stopped mounting my brackets flush with the trim. I took my 2 inch faux wood blinds 31 x 64 and pushed the headrail back two inches deeper into the window casing. This creates a 'shadow box' effect. By recessed-mounting the blinds closer to the glass, the window frame itself acts as a baffle to block the side light.

I specifically chose faux wood blinds 31x64 with the 2-inch slat size because the deeper slat provides a better physical overlap when tilted shut. If you use 1-inch slats, you have twice as many 'leak points' where the slats meet. The 2-inch version creates a much flatter, more solid wall of material when the motor pulls them tight.

Retrofitting the Motors Without Ruining the Slats

I went with a Zigbee-based tilt motor because I’m done with WiFi devices clogging my 2.4GHz band. The weight of 31" faux wood blinds is the sweet spot for most consumer motors. You don't need the industrial-strength torque required for automating larger 36 x 64 faux wood blinds, but you can’t use the cheap, battery-only versions meant for mini-blinds either.

One pro tip: hide the battery wand behind the headrail using heavy-duty Velcro. If you let it hang down the side, it pushes the slats out, creating a brand-new light gap. I learned that the hard way after wondering why the left side of my window looked like a lightsaber. Keep the cables tucked, or you'll ruin the seal you just worked so hard to create.

The Tilt Schedule That Actually Keeps the Room Dark

The secret sauce is the 'Over-Tilt.' Most smart blinds stop at 90 degrees (fully closed). I set a routine in Home Assistant that triggers 'Movie Mode.' It tells the motor to tilt to 92%. That extra 2% of travel forces the edges of the slats to physically compress against the window frame. It puts a tiny bit of strain on the motor, but it’s the only way to get a true blackout effect.

If you find that the slats are still letting too much ambient glow through, you might be fighting a losing battle with the material itself. In that case, I usually suggest switching to natural woven wood shades with a blackout liner. They don't have the 'slat gap' issue, though you lose that classic shutter look. For me, the 2-degree over-tilt on my faux wood setup did the trick.

FAQ

Do faux wood blinds warp in the sun?

High-quality ones don't. I've had mine in a south-facing window for three years. They handle the heat fine, but they are heavy, so make sure your mounting screws are hitting a stud or using toggle bolts.

Can I automate existing blinds?

Yes, as long as they have a tilt rod (the hexagonal metal bar inside the headrail). You just swap the manual wand for a motor. It takes about 15 minutes.

How long does the battery last?

With a 31-inch blind, I get about 8 months on a single charge. If you add a small solar panel clip-on, you'll literally never have to plug them in again.