A hexagon grid is unforgiving. Get a single panel two degrees out and the error carries across the whole ceiling, because every panel after it references the one before. By the far wall it is obvious, and it is obvious in every photograph you ever take in that room.
Half an hour with a laser level prevents all of it. Here is how to do the setting out properly.
What you need
- A self levelling cross line laser, ideally one with a ceiling or plumb mode
- A tripod, or a pole mount if the ceiling is high
- Tape measure, preferably two
- Pencil and low tack masking tape
- A joist or stud detector
- A cable and pipe detector, which is not the same thing
- Card or paper cut to panel size
A basic cross line laser is enough. The expensive features on a rotary laser mostly matter outdoors.
Step one: do not measure from the walls
This is the mistake that ruins most ceiling layouts.
Garage walls are rarely parallel and rarely square to each other. Blockwork wanders, render builds up in corners, and a garage built in 1974 was not set out with a laser. If you measure a centre point from two opposite walls, you get a centre that is true to nothing.
Measure the diagonals instead. If they differ, the room is not square, and you now know by how much. Then decide which reference line matters visually.
Step two: choose the reference line that people will see
A grid does not need to be square to the room. It needs to look square from where people stand.
In almost every garage that means aligning the grid to the garage door opening, because that is the line your eye reads when you walk in and it is the line that appears in every photograph taken from the driveway. If the back wall is two degrees out from the door, let the error sit at the back wall where nobody looks.
In a commercial unit, align to the main entrance or to the vehicle bay, not to whichever wall happens to be longest.
Pick the reference line consciously and write it down. Everything else follows from it.
Step three: project the centre line
Set the laser on a tripod on the floor, not held in your hand. Let it self level and leave it alone for a few seconds before trusting it.
Project your primary line along the ceiling, parallel to your chosen reference. Mark it with short strips of masking tape at intervals rather than pencil, so you can adjust without cleaning the ceiling later.
Then throw the perpendicular line. A cross line laser gives you 90 degrees automatically, which is the whole reason it beats a tape measure and a string line.
Work in dim light. Laser lines are much easier to see with the existing lighting off, and you are about to remove that lighting anyway.
Step four: set out the first panel, carefully
Everything depends on this one. Position your first panel exactly at the intersection of the two lines, or at the calculated offset from it if your layout is not centred on that point.
Two things to remember here.
First, if you intend to expand the grid later, position this stage where it will sit within the finished layout. That usually means mounting slightly off centre now so the completed grid ends up centred, which feels wrong on the day and looks right permanently.
Second, check the first panel twice before drilling. Measure from the laser line to two opposite corners of the panel. If those measurements differ, it is rotated, and every panel after it will inherit that rotation.
Step five: work outward and check for drift
Hexagon panels link edge to edge, which makes it tempting to simply chain them outward and trust the connectors. Do not.
Small tolerances in each connection accumulate. Three panels out it is invisible. Nine panels out it is a visible curve in what should be a straight run.
Every third or fourth panel, check the leading edge against the laser line. If it has drifted, correct it there rather than carrying the error forward.
Before you drill anything
- Run the joist detector along every fixing point. On a plasterboard ceiling you want either a joist or a suitable cavity anchor, not hope.
- Run a cable and pipe detector over the same points. Garage ceilings hide lighting circuits, and a loft above means pipework.
- Note where any garage door mechanism, track and spring assembly sits.
- Check the arc of an up and over door before committing to a layout near the opening.
The paper test, which is still worth doing
Even with a laser, cut hexagons from card at panel size and tape them up first. The laser tells you whether the grid is straight. The card tells you whether it is the right size and in the right place, which is a different question.
Twenty minutes here has saved a lot of people from discovering that their cluster looks lost in the middle of a large ceiling.
Common mistakes
- Measuring from walls rather than establishing a true reference line
- Holding the laser instead of mounting it
- Not letting a self levelling laser settle before marking
- Trusting the first panel without checking it for rotation
- Chaining panels without checking cumulative drift
- Using a cheap laser at the limit of its range, where line thickness alone introduces error
- Drilling before detecting cables
A note on laser safety
Construction lasers are typically class 2. They are not going to blind you casually, but do not look directly into the beam, do not point one at anyone, and be aware of where the line lands when you move the tripod. Safety glasses designed for laser work make the line easier to see as a bonus.
Frequently asked questions
Do I really need a laser level for this?
For a small kit in a square room, a tape measure and a chalk line will do. For anything above about fourteen panels, or in a room that is visibly not square, a laser saves time and produces a noticeably better result.
Can I use a phone app instead?
Phone levels are fine for checking a single panel is level. They cannot project a line across a ceiling, which is the actual job here.
What if my ceiling is not flat?
Common in older garages. Set out to the laser line for position, then pack individual fixings as needed so panels sit flush. A suspended grid solves this entirely if the variation is significant.
How long should setting out take?
Thirty to sixty minutes. It is the part people rush and the part that determines how the finished ceiling looks.
Planning an install? Browse the hexagon lighting range and the accessories collection for suspension kits, or send us your ceiling dimensions and we will suggest a layout.