A standard gypsum board can safely span up to 600 mm between supports when installed on the ceiling, and up to 400 mm for heavier 15 mm boards. The maximum span depends on board thickness, framing system, and load factors.
TRUSUS structural insight: the limit of a board is not about its strength—it’s about the harmony between material and structure.
Span calculations reflect how the ceiling system distributes weight evenly, preventing deflection or cracking during its service life.
How Big of a Gap Is Okay for Drywall (Gypsum Board)?
A gap of no more than 3 mm between sheets is acceptable before finishing. If the board joints exceed that, use joint compound and tape to restore continuity and prevent visible seams after painting.
finishing insight: small gaps talk; large gaps shout—control early to ensure a flat surface later.
Gap Control Table
| Gap Size | Action | Purpose |
|---|---|---|
| ≤ 3 mm | Fill with standard joint compound | Standard finishing |
| 3–5 mm | Use tape plus two-layer compound | Prevent cracking |
| 5–10 mm | Apply backer strip plus filler | Structural closure |
| > 10 mm | Replace or recut board | Avoid long-term failure |
Proper gap management not only improves appearance but reduces structural stress from temperature changes or movement.
What Is a Gypsum-Based Ceiling System?
A gypsum-based ceiling system is a complete ceiling structure composed of gypsum boards attached to a metal or wooden framework, often integrated with insulation, lighting, and sound control systems. It functions as both a finish and a performance layer.
system insight: a gypsum ceiling isn’t a cover—it’s cooperation between layers of function.
Components of a TRUSUS Gypsum Ceiling System
| Component | Function | Material Example |
|---|---|---|
| Primary Frame | Load and suspension support | Galvanized steel channels |
| Secondary Frame | Sheet attachment base | Furring or cross battens |
| Gypsum Boards | Finishing and fireproof layer | 9 mm–15 mm plasterboard |
| Insulation Layer | Acoustics and thermal balance | Glass wool, mineral fiber |
| Joint and Finishing | Seam and texture control | Tape, joint compound |
| Surface Treatment | Aesthetic finish | Paint or decorative coating |
This system transforms a ceiling into an integrated field of performance: quiet, fire-resistant, and visually consistent.
What Is the Difference Between Suspended Ceiling and Plasterboard Ceiling?
A suspended ceiling hangs below the main structure using a metal grid, typically with modular panels that allow easy access for maintenance. A plasterboard ceiling, on the other hand, is a continuous surface made by fixing gypsum boards directly to a framing system.
comparison insight: both float below structure, but one hides systems—the other defines them.
Comparison Chart
| Feature | Suspended Ceiling | Plasterboard Ceiling |
|---|---|---|
| Structure | Modular grid system | Fixed framing system |
| Access | Easy for MEP and lighting | Limited, cut-open needed |
| Finish | Replaceable panels | Seamless surface |
| Acoustic Control | High, due to insulation layer | Depends on board density |
| Maintenance | Simple and quick | Requires patchwork after access |
| Common Use | Offices, commercial areas | Homes, hotels, theatres |
Each type serves a different design goal—suspended ceilings for flexibility and serviceability, plasterboard ceilings for acoustic and aesthetic continuity.
Conclusion
At TRUSUS, I see gypsum ceilings as structured conversations between form and function. Their real span is not measured in millimeters but in the distance they bridge—between performance, precision, and the beauty of built space.