ENEnglish
VITiếng Việt
ZH中文
KO한국어
JA日本語
FRFrançais
ITItaliano
PTPortuguês
ESEspañol
HEעברית
ARالعربية
trần thả · lay-in
Exposed T-grid ceiling
Main tees and cross tees on hangers carry 600 × 600 or 600 × 1200 tiles – offices, shops, schools, clinics.
Building materials · Ceilings
Gypsum ceilings – clean, quiet and fire-safe under every steel roof
A gypsum ceiling hides ducts, cables and steelwork, improves acoustics and fire safety and gives a building its finished look. Choose an exposed T-grid ceiling with lay-in gypsum tiles for easy access, or a concealed flush ceiling of screwed gypsum boards for a seamless finish – both supplied by World Steel with the steel structure.
- 600 × 600
- Standard lay-in tile, mm also 600 × 1200, 603 / 595 sizes
- 9 – 12.5 mm
- Flush ceiling board single or double layer
- 2 systems
- Exposed grid · concealed access vs seamless
- MR · FR · acoustic
- Board options humid, fire-rated, sound
Why buildings have suspended ceilings
Under a steel roof or floor run ducts, sprinklers, cables and lights. A suspended ceiling hangs below them on rods or wires, creating a plenum for services and a clean, flat surface below. In gypsum, the ceiling also adds fire protection to the structure above, acoustic comfort to the room and a reflective surface that makes lighting more efficient.
Gypsum ceilings come in two families. Exposed-grid (lay-in) ceilings use a visible T-bar grid with tiles dropped in – any tile can be lifted for access. Concealed (flush) ceilings fix gypsum boards to a hidden steel frame and joint them for a seamless finish, with access panels where services need them. In Vietnamese these are trần thả and trần chìm.
Systems
Gypsum ceiling systems
The common systems – the World Steel ceiling product pages will be published here.
trần thả · lay-in
humid · washable
PVC-laminated gypsum tiles
Vinyl-faced tiles for kitchens, food plants, hospitals and humid climates.
trần chìm · drywall
Concealed flush ceiling
Gypsum boards screwed to furring channels on main carriers – lobbies, hotels, homes.
Type X / F boards
Fire-rated ceiling
Fire-resistant boards in tested systems to protect the steel or floor above.
MR / H boards
Moisture-resistant ceiling
For bathrooms, kitchens, covered outdoor areas and humid regions.
perforated boards
Acoustic ceiling
Perforated gypsum with a fleece and mineral wool overlay for sound absorption.
Codes & compliance
Standards for suspended ceilings
Common standards for ceiling grids, boards and installation in our export markets.
United States
- ASTM C635 · C636Metal suspension systems for acoustical tile and lay-in panels; installation
- ASTM E580Installation of ceiling suspension systems in seismic areas
- ASTM C1396 · C645Gypsum board; non-structural steel framing members
Europe
- EN 13964 + CESuspended ceilings – requirements and test methods
- EN 14195 · EN 520Metal framing components for gypsum board systems; gypsum plasterboards
Australia & New Zealand
- AS/NZS 2785Suspended ceilings – design and installation
- AS/NZS 2588 · NCCGypsum plasterboard; National Construction Code
Summary for orientation only – the project specification, the adopted code edition and the authority having jurisdiction govern.
Exposed grid
Lay-in tiles: access everywhere
Main tees hang from the structure at about 1.2 m centres; cross tees lock between them to form the 600 × 600 or 600 × 1200 grid; wall angles finish the perimeter. Tiles simply drop in. Lights, diffusers and sprinklers fit the grid module, and every tile can be lifted for maintenance – the reason exposed-grid ceilings dominate offices, retail and public buildings.
Concealed ceiling
Flush gypsum: one seamless surface
Hangers carry main carrier channels; furring channels clip below them at about 400–600 mm; gypsum boards are screwed to the furring, the joints are taped and finished and the ceiling is painted. Curves, bulkheads, coves and lighting slots are easy to form. Access panels are planned at valves, dampers and junction boxes.
World Steel · building envelope hub
Ceiling, insulation and structure in one package
World Steel plans ceilings with the structure: hanger points on the purlins or deck, ceiling heights and service zones in the 3D model, ROCKWOOL or glass wool above the tiles, and gypsum board and fibre cement for walls and wet areas – all shipped together.
Choose
Exposed grid or concealed?
A quick guide – many buildings use both.
| Criterion | Exposed T-grid (lay-in) | Concealed flush ceiling |
|---|---|---|
| Look | Visible grid, modular | Seamless, monolithic |
| Access to services | Any tile can be lifted | Access panels only |
| Installation speed | Fast – no jointing | Slower – jointing and finishing |
| Typical spaces | Offices, shops, schools, clinics, factories | Lobbies, hotels, homes, meeting rooms |
| Humid areas | PVC-laminated or MR tiles | MR boards with suitable paint |
| Fire rating | Only in tested grid and tile systems | Readily achieved with Type X / F boards in tested systems |
| Cost | Lower | Higher |
FAQ
Frequently asked questions
What is the difference between trần thả and trần chìm?
Trần thả is an exposed-grid ceiling with lay-in tiles on a visible T-bar grid; trần chìm is a concealed flush ceiling of gypsum boards screwed to a hidden frame and jointed.
What size are gypsum ceiling tiles?
Most commonly 600 × 600 mm, also 600 × 1200 mm; some markets use 603 × 603 or 595 × 595 mm modules to suit the grid.
Can a gypsum ceiling be fire-rated?
Yes, when fire-resistant boards are installed in a tested ceiling system – the rating belongs to the complete system, not to the board alone.
Which ceiling for humid areas?
PVC-laminated gypsum tiles or moisture-resistant boards with a suitable paint, and good ventilation of the plenum.
Does World Steel supply ceilings?
Yes – grids, tiles, boards, framing and insulation with the steel structure, as one package.
Related content
SolutionsMulti-storey buildings
Ceilings for your steel building
Send us the ceiling plan and room uses – we quote the ceiling system, insulation and structure together.