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A Professional Guide to Procuring the Perfect S-Fold Curtain by Foulola
For 25 years, Foulola has been at the forefront of crafting premium window treatments.
The S-fold curtain remains a client favorite for its seamless, flowing aesthetic.
However, its impeccable appearance relies on a precise combination of components. Beyond fabric selection,
understanding the technical parameters is key to ensuring a flawless outcome.
1. The Heart of the System: The Track & Runner Mechanism
The track and runner system is not just a functional component;
it is the very engine that creates the signature S-shaped wave.
1）Dedicated S-Fold Track: A standard curtain track cannot create this effect.
You must use a track specifically designed for S-fold curtains, equipped with specially spaced gliders.
2）The Critical Parameter - Runner Distance: This is the most crucial and often overlooked technical aspect.
The distance between the runners (gliders) on the track directly determines the depth and frequency of the waves.
This measurement is fixed by the track system you choose and dictates which curtain tape you must use.
To illustrate this core relationship, please refer to the Foulola S-Fold Parameter Table:
S Fold Curtain Parameter List--Foulola
| Runner Distance | Curtain Tape Distance | Curtain Times (Estimation) | Single Rail Box Minimum Capacity Width | Double Rail Box Minimum Capacity Width |
| 60MM | 107MM | About 1.8 Times | 110MM | 220MM |
| 125MM | About 2.1 Times | 130MM | 260MM | |
| 145MM | About 2.5 Times | 150MM | 300MM | |
| 70MM | 107MM | About 1.6 Times | 110MM | 220MM |
| 125MM | About 1.9 Times | 130MM | 260MM | |
| 145MM | About 2.8 Times | 150MM | 300MM | |
| 80MM | 107MM | About 1.4 Times | 110MM | 220MM |
| 125MM | About 1.6 Times | 130MM | 260MM | |
| 145MM | About 1.9 Times | 150MM | 300MM |
2、How to Use This Table:
1)Runner Distance: This is the fixed center-to-center distance between the gliders on your track (60mm, 70mm, or 80mm).
A smaller distance creates more frequent, tighter waves, while a larger distance creates broader, more relaxed waves.
2)Curtain Tape Distance: This is the sewn-in pocket tape on the back of the curtain.
It must correspond to the runner distance of your track. For example, an 80mm runner system requires a 107mm,
125mm, or 145mm tape to function correctly.
3)Curtain Times (Fullness): This is the fabric gather ratio. A higher multiplier (e.g., 2.8 times) means more fabric is used,
resulting in fuller, more luxurious waves and better light blockage. The combination of runner distance and tape distance determines this.
3、 Fabric Selection: Complementing the Mechanism
The mechanism creates the wave, but the fabric brings it to life.
1）Weight and Drape: Choose medium to heavy-weight fabrics (we recommend over 300gsm) for optimal results.
Lightweight fabrics may not hold the S-shape crisply and can appear limp.
2）Pattern Matching: For patterned fabrics, ensure your manufacturer (like Foulola) accounts for "pattern matching"
at the seams so the design flows seamlessly across the waves.
4、 Precise Measurement: The Non-Negotiable Step
With S-fold curtains, measurements are intrinsically linked to the track system.
1）Calculating Finished Width: Your track length is predetermined by your window or wall.
The finished width of the curtain is calculated based on this length and the chosen "Curtain Times" from the table.
2）Formula: Finished Curtain Width = Track Length x Fabric Fullness (Curtain Times)
3）Calculating Finished Height: Measure from the top of the track to your desired finishing point (floor or sill).
Remember to account for the track's height and any clearance needed above the floor (we recommend 1-2cm).
5、 Installation & After-Sales
The final, critical step is professional installation. Our certified installers at Foulola understand how to hang these curtains under tension correctly to activate the perfect wave formation,
ensuring every pleat falls as designed.
6、Why Partner with Foulola?
With 25 years of expertise, Foulola provides more than just a product;
we provide a seamless, professional solution. We guide you in selecting the right runner system and fabric combination from our extensive collection,
ensure precise measurements, and deliver a perfectly crafted and installed S-fold curtain that embodies elegance and precision.
We hope this detailed guide empowers you to make an informed decision. For a flawless S-fold curtain experience, trust the experts at Foulola.
