Vertical blinds are the workhorse of Australian homes, especially for wide sliding doors and floor-to-ceiling windows. However, because they involve a complex tracking system and multiple moving slats, they are the easiest product to “get wrong” if you aren’t careful during the DIY process.
Avoid these five critical mistakes to ensure your vertical blinds look architectural and function flawlessly.
1. The “Stacking” Direction Disaster
This is the most common functional error. The “stack” refers to the bunch of slats when the blind is fully open.
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The Mistake: Ordering a “Left Stack” when your sliding door handle is also on the left. You will have to slide the entire set of blinds out of the way just to reach the handle and go outside.
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The Fix: Always stack your blinds on the fixed-glass side of your door.
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One-Way Stack: All slats move to one side (ideal for standard sliders).
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Split Stack (Centre Opening): Slats move to both sides like a pair of curtains (perfect for large “bi-parting” doors).
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2. Using “Inside Mount” on Shallow Recesses
Unlike roller blinds, vertical slats need a significant amount of depth to rotate.
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The Mistake: Forgetting that a 127mm or 90mm slat needs a clear path to spin. If your window recess is too shallow, the slats will hit the glass or the window handle, preventing them from opening or closing properly.
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The Fix: Check your recess depth. Most vertical systems require at least 60–75mm of clear space. If you have window winders or security sensors in the way, play it safe and choose a Face Fit (mounting to the architrave) to give the slats plenty of room to move.
3. The “Cloth Tape” Measuring Trap
Vertical blinds are precision-engineered. If your measurement is out by even a few millimetres, the slats might drag on the floor or the track won’t fit the window width.
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The Mistake: Using a flexible cloth sewing tape or a laser measurer on a reflective surface. These can sag or “bounce,” giving you an inaccurate reading.
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The Fix: Use a high-quality steel tape measure. Measure the width and drop in three places (top, middle, bottom).
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For an Inside Mount, provide the smallest width and the smallest drop.
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For a Face Fit, measure from the outside edges of the architraves to ensure total coverage.
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4. Misjudging the “Drop” Height (Floor Clearance)
Nothing ruins the look of vertical blinds faster than slats that “puddle” on the carpet or hang too high like a pair of short trousers.
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The Mistake: Measuring to the floor and forgetting to account for the track height or high-pile carpets.
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The Fix: We recommend your slats finish 10–15mm above the floor. This prevents them from picking up dust, getting caught in the vacuum, or tangling with each other when the wind blows. If you have thick carpet, measure to the top of the fibres, not the floorboard.
5. Overlooking “Bottom Chain” Safety
In a busy household with pets or toddlers, the traditional “bottom chains” (the little plastic links connecting the slats) are a major liability.
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The Mistake: Ordering old-fashioned chained verticals in high-traffic areas. They break easily and can be a trip or tangle hazard.
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The Fix: Upgrade to Sewn-in Weights. These are weights tucked inside a pocket at the bottom of each slat. They look much cleaner, move more independently in the breeze, and eliminate the need for messy plastic chains.
| Checkpoint | What to Verify |
| Obstructions | Do window handles or locks protrude into the rotation path? |
| Stack Side | Does the blind stack away from the door handle? |
| Mounting | Is there enough depth (approx. 60mm+) for an inside fit? |
| Floor Gap | Have you allowed 10-15mm for the slats to clear the floor? |
| Safety | Have you considered a wand control instead of a cord? |
Get a Professional Result, DIY Style
Vertical blinds don’t have to be difficult. By taking five minutes to double-check your measurements and door orientation, you can achieve a high-end, custom look for a fraction of the retail cost.
