Buyers often assume the thicker sheet is the better one, and that a heavier number on a data sheet means a more durable wall. It does not. Thickness in flexible stone is a consequence of four project conditions — and only one of them is about durability.
What the range actually covers
Across the KASARO collection, thickness varies by product series and panel size. The catalogue shows ranges from approximately 2 mm to 10 mm, including 2–4 mm, 2–5 mm, 3–6 mm, 3–8 mm, 3–10 mm and 2–8 mm.
Regular panel sizes and coverage
- 600 × 1200 mm
- 0.72 m² per panel
- 1200 × 2400 mm
- 2.88 m² per panel
- 1200 × 3000 mm
- 3.60 m² per panel
Size and thickness travel together. A larger sheet in a heavier series behaves differently on a substrate than the same finish in the smallest module, and the pair has to be chosen as one decision.
The four conditions that decide it
1. Geometry
Curvature is the strongest driver. A tighter radius needs a thinner, more adaptable sheet. If your elevation includes columns, curved counters or arches, thickness is effectively set by the tightest radius in the drawings.
2. Substrate
A smooth, sound concrete or plaster substrate will take a thin sheet bonded with adhesive. An uneven or irregular substrate needs either preparation or a heavier, more forgiving panel — sometimes both. Substrate condition is the most common reason a specified thickness has to change after a site inspection.
3. Fixing method
Adhesive bond suits interior work and thin sheets. A ventilated rainscreen uses aluminium carrier panels and can take heavier sheets on facades. Concealed mechanical clips are for soffits and ceilings. The fixing method and the thickness have to be selected together.
4. Service conditions
High-traffic commercial interiors, wet rooms and exposed facades put different demands on the surface. This is where a heavier sheet or a more resistant series earns its place — not because it looks better in a specification table, but because it will be scrubbed, soaked or weathered harder.
Why thickness is not a quality ranking
A 2–4 mm sheet and a 3–10 mm sheet are made to the same standard, from the same class of raw material, on the same production line. The thicker sheet is heavier to carry and less adaptable around a radius. Choosing it "for safety" on a curved interior wall buys you weight and loses you bend.
The right thickness is the one the substrate, the geometry and the fixing method ask for — not the largest number the finish is made in.
On weight and structural claims
Do not estimate structural load or installation savings from thickness alone. Request the confirmed product weight per square metre for the selected model and compare the complete installed system — sheet, adhesive or carrier, substrate and fixings. That is the number that matters to a structural engineer.
How to confirm it
- Send the finish or series you are considering, plus the panel size.
- Tell us the application — interior, exterior, wet area, high traffic.
- Send the radius data for any curved element.
- Describe the substrate as built, with a photograph if available.
We confirm the applicable thickness, the fixing system and the weight per square metre for your specific assembly — in writing, before you specify.
Ask the factory, not the catalogue
The catalogue gives the range. The project needs a number. Send the conditions and the technical department returns the confirmed thickness, fixing method and data sheet within one working day.