Vertical Blinds for Patio Doors: Stacking Louvres Clear of the Opening

Vertical blinds for patio doors should stack over the fixed pane, never over the pane that slides, and on a wide door a split stack opening from the centre usually beats a single stack pushed to one end. That single decision does more for daily use than any fabric choice.

Fabric, colour and control side are preference. Where the louvres pile up when the blind is drawn back is the thing you live with every time you open the door.

Key Takeaways

• Stack over the fixed pane. The bundle of louvres belongs on the half of the door that never moves, so you walk through clear glass.

• Split stacks suit wide doors. Parting from the centre halves the depth of the pile and puts it at both edges, out of the walkway.

• Measure the drop to the threshold. Louvres that touch the floor drag, fray at the hem and knock the weights off.

• Wider louvres stack deeper. The wider the slat, the fatter the bundle sitting over your glass when the blind is open.

• Check the handle before anything. A door handle that stands proud of the frame decides whether the track goes on the wall or in the recess.

Where the Stack Goes on Vertical Blinds for Patio Doors

Stand inside the room and watch which pane moves. On most sliding doors one leaf slides behind a fixed panel, and that fixed panel is where the louvres should gather. Put the stack on the sliding leaf instead and you spend the summer pushing a bundle of fabric sideways to reach the handle.

The control side follows from that. If the door slides to the left, the blind should draw to the right, and you order it that way rather than correcting it later. Across the vertical blinds for patio doors range the stack side is set when the headrail is made, so it is worth getting right first time.

Be honest with yourself about what the stack costs you. It never disappears. Drawn fully back, the louvres still sit in a column against the frame and cover a strip of glass, and on a door with a narrow fixed pane that column can overhang the opening by a few centimetres. That is the standing cost of vertical blinds for patio doors, and no product photograph shows it.

Single Stack Against a Split Stack

On vertical blinds for patio doors a single stack gathers every louvre at one end. It is simple, it suits a door up to about the width of a standard two-panel slider, and it gives you one clear run of glass when the blind is open.

Past that width the pile gets deep, and depth is the problem. Double the number of louvres and the bundle roughly doubles with it, which on a three or four panel door can mean a column standing well into the opening. A split stack solves it by parting in the middle and travelling to both ends, so each side carries half the louvres. You get two thinner columns at the edges rather than one fat one where you walk.

The trade is a seam. With a split stack the two leading louvres meet in the centre of the door, and in strong afternoon sun you can see the join. Most people take that over the alternative. If you are pricing up vertical blinds for a wide opening, specify the split when you order, because it is a headrail decision and cannot be changed afterwards.

Measuring the Drop Over a Threshold

This is where orders for vertical blinds for patio doors go wrong. Patio doors sit on a threshold, a raised metal or uPVC strip across the floor, and the drop has to clear it. Measure to the floor and the louvres land on the threshold, splay outwards, and within a month the hems are grubby and the bottom weights have been kicked off.

Measure from the top of the headrail position down to the threshold, then take a little off so the louvres hang free above it. A gap you can see daylight through at the very bottom is correct. It looks wrong on paper and right in the room.

Check the floor at both ends too. Floors in older houses are rarely level across a three metre opening, and a drop that clears at one end can drag at the other. Measure at each end and at the centre, then work from the shortest of the three. The same rule covers patio door blinds of any type and most blinds for sliding doors, since every one of them has the same threshold to get past.

Louvre Width on a Very Wide Door

Louvres on vertical blinds for patio doors come in more than one width, and the choice is a trade between how the blind looks and how deep it stacks. Narrower louvres make a finer, more even curtain across the glass and gather into a slimmer bundle. Wider ones give fewer vertical lines across a big opening, which reads calmer, at the cost of a deeper stack.

On a very wide door there is a practical argument for the narrower option even if you prefer the look of the wider. The bundle is what sits in front of your view all day. Worth knowing as well: louvres are individually replaceable, so a single slat split by a door handle or chewed by a dog does not mean a new blind, just replacement vertical blind slats in the same width. Buy sliding patio door blinds in a common width and that repair stays easy for years.

Doors that fold rather than slide are a different problem, because the leaves stack against each other and there is no fixed pane to hide a bundle behind, which is why blinds for bifold doors tend to be fitted to each leaf instead. For a true slider, the fixed pane is where vertical blinds for patio doors belong. Use it, split the stack if the door is wide, and keep every louvre clear of the threshold.

Frequently asked questions

How do you measure a patio door for blinds?

Measure the width of the opening you want covered, not the glass alone, and add an overlap at each side so the closed blind beats the frame rather than meeting it. For the drop, measure from your fixed headrail position down to the threshold strip, not to the floor. Take the measurement at both ends and the middle, then use the shortest drop of the three.

How do you measure for vertical blinds?

Decide first whether the headrail goes inside the recess or on the wall above it. Inside, measure the recess width at the top, middle and bottom and use the narrowest. Outside, measure the glass and add a generous overlap each side and above. Drop is measured from the headrail line to where you want the louvres to finish, which on a door is above the threshold.

How do you fit vertical blinds?

The headrail is held by brackets screwed into the wall above the opening or into the top of the recess. Mark the bracket positions level, fix them, clip the rail in, then hang each louvre on its carrier and hook the chain and weights along the bottom. Louvres go on last so the rail can be levelled without their weight on it. Check the door opens fully before you load them.