In short
True trimless lighting needs a ceiling or wall lining to plaster into; with exposed concrete, use rafts, bulkheads or cast-in details, or choose surface or suspended lighting.
Exposed concrete has no void and no board to plaster into.
Options
- Create a plasterboard raft or bulkhead for trimless lines
- Cast-in profiles, coordinated with the structural engineer
- Surface or suspended lighting for exposed soffits
Our advice
Plan early. Cast-in details are very difficult to change later.
Further reading at 299 Lighting
Next steps on trimlesslighting.com
Planning a trimless ceiling?
Send us your reflected ceiling plan. We'll come back with a shortlist, plaster-in details and lighting calculations.
Start a project →Frequently asked questions
Can trimless lighting be used on concrete ceilings?
Only with a lining, raft, bulkhead or cast-in detail. Otherwise choose surface or suspended lighting.
What is a lighting raft?
A section of lowered ceiling that houses recessed or trimless lighting below a solid soffit.
