Laser level at the ceiling: suspended ceilings, downlights, track
Why never start from the existing ceiling?
Because a ceiling is rarely flat and almost never level. Measuring 30 cm down from the ceiling in each corner gives four different levels, and a suspended ceiling that copies the faults of the old one. The difference shows at the first length of track, and cannot be undone after that.
The laser's horizontal plane gives the only reference worth having: one level, the same throughout the room.
How do you carry the level round?
Three moves: stand the instrument on the floor in the middle of the room and let it level itself; at one point measure the distance between the horizontal plane and the wanted level of the suspended ceiling; then carry that same distance to every point, which gives the ceiling line.
- Set the instrument on the floor in the middle of the room and let it level itself.
- At one point, measure the distance between the horizontal plane and the level you want for the suspended ceiling.
- Set that same distance out at every point: that is the line of the suspended ceiling.
An instrument with two horizontal planes, like our 16-line, lets you keep a low horizontal for dimensions at the floor while the high one serves the ceiling.
Why the pole rather than the tripod?
Because a tripod tops out at a height that does not let you work comfortably up at the ceiling. A common site tripod goes to 1.50 m. Above that you need a telescopic pole, which extends to 4 m and braces floor to ceiling — we do not carry one at the moment.
| What you need | Support | Why |
|---|---|---|
| Marking the suspended ceiling line | Instrument on the floor | The horizontal plane rises on its own |
| Working at ceiling height | Pole | High, steady bracing, fine adjustment |
| Setting out downlights | Instrument on the floor | The vertical plane marks the ceiling plumb |
How do you line up downlights?
Three moves: set out the line of the downlights on the floor using the vertical plane, mark the positions on the floor at the wanted centres with a tape, then turn the vertical plane through 90° to carry each position up to the ceiling, plumb. The marking happens on the floor.
- Mark the line of the downlights on the floor, using the vertical plane.
- Mark the positions on the floor at the centres you want, with a tape.
- Turn the vertical plane through 90° to mark each position on the ceiling, plumb above.
A model with 360° planes gives the vertical in both directions without being moved; otherwise the instrument has to be reset for each axis.
And the suspended ceiling track?
The perimeter angle goes on the marked line. The main runners are then checked against the horizontal plane: run a straightedge under each one and the gap to the plane reads off directly. A runner that sags shows before the tiles go in, not after.
What about a very tall room?
Two difficulties appear: the line becomes harder to read with distance, and the slightest angular error turns into a large gap up top. Two answers: bring the instrument closer to the ceiling with the pole, and check it before you start with the reversal test.
The mounts are in the accessories section.
See the laser levels for ceilings
- The existing ceiling is not a reference: the horizontal plane is.
- One measurement, carried everywhere, replaces four in the corners.
- The pole works where the tripod stops.
- Downlights are set out on the floor, then carried up plumb.