Why one panel becomes two
A shutter panel is a frame full of louvres, hinged along one edge, carrying all of its own weight on that edge. Past a certain width the weight starts to tell. The panel settles on its hinges, the stiles twist a fraction, and the blades stop closing sweetly. Rather than let that happen slowly over a few summers, the trade caps how wide a single panel is built and divides the opening instead.
The exact number moves with the material and the maker. Across Australian shutter suppliers a single basswood panel is usually held somewhere around 900 to 950 mm, PVC lower again at nearer 750 mm because PVC blades are heavier for their size, and cedar stretches further than either. Those are typical industry ranges rather than a standard, and the ones that apply to your windows get settled at the measure, against the actual opening.
The same idea at three widths. The wider the opening, the more panels it wants, and the darker vertical is a T-post: a fixed upright the panels close against.
The three ways an opening gets divided
- A pair. Two panels, hinged one from each side, meeting in the middle. This is the answer for most ordinary bedroom and living-room windows, and it is what people picture when they picture shutters.
- A bank with a T-post. Past a certain width you want something solid in the middle. A T-post is a fixed upright built into the frame; the panels close against it instead of against each other, so the weight goes into the frame where it belongs. Wide living-room glass usually ends up here.
- A bi-fold. Narrower panels hinged to each other so they concertina back along the head. This is the one for sliding doors and alfresco openings, where some days you want the whole covering folded out of the way entirely.
Which way should they open?
Nobody thinks about this until the panels are on the wall, and then they think about it every day. It is one of the things we ask you at the measure, standing in the room, because the right answer is about how you use the space and not about the window.
- Where you walk. A panel that swings into a doorway, a bedside table or the path to the kitchen bench will irritate you for years.
- The sash you actually lift. On a double-hung window you still open for the cross-breeze, hinge the panels so you can get a hand to the sash without folding both of them back first.
- Corners and returns. Two windows meeting near a corner want their panels swinging away from each other, not competing for the same bit of air.
- Where the light arrives. In an east bedroom you often want to open just the panel taking the morning beam. Hinge that one so it clears on its own. The east and south guide covers what that beam does.
The divider rail, and the trick it allows
On a tall panel, generally anything over about 1.8 m, the louvres are usually broken into an upper and a lower section: either with a divider rail across the middle, or with a split tilt rod that does the same job without a visible bar. It stiffens a tall panel, which is the engineering reason. The better reason is that it gives you two halves you can set differently.
On a cottage frontage sitting close to the footpath, that is the whole game. Close the bottom half against the street and leave the top half open to the sky: the room keeps its daylight and the footpath sees nothing. Street privacy without going dark goes further into the angles.
Blade width is what people ask about. Panel layout is what they live with.
What it costs you
Every division adds stiles, and a stile is timber, not view. A four-panel bank across a wide window puts three or four vertical bars where there used to be unbroken glass, and no amount of careful fitting gets those back. Wide openings are always a trade between how the shutter looks closed and how much of the outlook survives when it is open. On a big picture window that is worth talking through in the room rather than settling off a sketch, which is most of why we come out.
If you are still weighing the blades themselves, 63, 89 or 114 mm is the companion to this one, and the Aspect Planner will work through your rooms with you. Otherwise, book a free measure and we will lay the panels out at the window with you.