A reflected ceiling plan (RCP) shows the ceiling of a floor as if it were reflected in a mirror on the floor below: you see the ceiling from underneath, but it is drawn the same way round as the floor plan, at the same scale, so walls, grids and north line up sheet over sheet. It shows ceiling materials and grids, ceiling heights, soffits and bulkheads, and everything mounted in the ceiling: lights, air diffusers and returns, sprinkler heads, smoke detectors, speakers, access panels and exit signs. Florida law, which defines the term for interior design licensing, puts it simply: a ceiling design plan "laid out as if it were projected downward".
Why it is called "reflected"
If you drew the ceiling exactly as you see it looking up, the plan would be mirrored: a light in the north-east corner of the room would appear in the north-west. Projecting the ceiling down onto the floor, as if reflected, keeps the orientation of the floor plan. That is what lets you lay the RCP over the floor plan, sheet over sheet, and check that a light sits above the desk it is meant to light.
What a reflected ceiling plan shows
- Ceiling types and materials: suspended acoustic tile grids, gypsum board, exposed structure, wood or metal panels, each identified by a tag or hatch in the legend.
- Ceiling heights: usually as height above finished floor, for example "CLG 9'-0" AFF" or "+2.70".
- Soffits, bulkheads and changes of level, with their heights.
- The grid: tile size (commonly 2x2 or 2x4 ft, 600x600 or 600x1200 mm) and where the grid starts.
- Light fixtures: troffers, downlights, linear lights, with type tags that point to the lighting schedule.
- HVAC devices: supply diffusers, return grilles, exhaust grilles.
- Life safety devices: sprinkler heads, smoke detectors, horn/strobes, exit signs, emergency lights.
- Other ceiling items: speakers, cameras, access panels, projectors, ceiling-hung equipment.
Where to find it in the set
Under the US National CAD Standard, ceiling plans are plans, so they sit in the A-1xx series with the floor plans. Numbering varies between offices: some number the RCP right after the matching floor plan (A-101 floor plan, A-102 ceiling plan), others give ceiling plans their own block in the series. The sheet index on the cover sheet tells you which.
How to read a reflected ceiling plan
- Read the legend first. Ceiling symbols differ between offices and between engineers. The legend tells you which circle is a sprinkler and which a downlight.
- Lay it over the floor plan. The RCP and the floor plan of the same level share orientation and scale. Check that ceiling changes follow the room layout and that lights sit where the furniture and work happen.
- Read the ceiling heights room by room, and compare them with the building sections and interior elevations. A height that differs between the RCP and a section is a question for the architect.
- Check the grid origin. Where does the grid start: at a wall, centred in the room, or on a column line? It decides every tile cut at the walls.
- Follow each device to its schedule: light fixture types to the lighting schedule, diffusers to the mechanical schedule.
- Check the space above. The ceiling height plus the depth of the deepest duct, beam and light fixture must fit below the structure. If the plenum (the void between ceiling and structure) is too shallow, the ceiling height cannot be built.
Laying out the grid: the border tile rule
Suspended ceiling manufacturers recommend balancing the grid so the cut tiles at opposite walls are equal and not too narrow. Armstrong's installation instructions, for example, recommend border panels equal on opposite walls and no less than 10 inches wide; a common metric rule is that border tiles should be more than half a tile. In a 4,320 mm room with 600 mm tiles, six full tiles with a 360 mm border on each side is a good layout; seven full tiles with 60 mm slivers at each wall is not. The RCP should show the grid origin so the installer does not have to guess.
Who draws what on the RCP
| Discipline | Usually responsible for |
|---|---|
| Architect or interior designer | Ceiling types, heights, grid origin, soffits and bulkheads |
| Electrical engineer | Light fixtures, exit signs, emergency lighting |
| Mechanical engineer | Supply diffusers, return and exhaust grilles |
| Fire protection | Sprinkler heads (spacing set by the fire code and the sprinkler design) |
| Fire alarm, AV, security | Smoke detectors, horn/strobes, speakers, cameras |
The architectural RCP is often the sheet where all of these meet, which makes it the best place to catch clashes: a sprinkler head in the middle of a light fixture, a diffuser blowing straight at a smoke detector, a speaker where the tile cut is too narrow to hold it. Our guide to reading MEP drawings explains the engineers' sheets these devices come from.
Fire-rated ceilings
Some ceilings are part of a fire-rated floor or roof assembly, tested as a whole. In those assemblies, light fixtures and other openings are limited and often have to be protected (boxed or tented) exactly as the tested design describes, or be specifically listed for it. If an RCP shows a rated ceiling, the assembly's design number in the drawings or specifications decides what may go in it; adding a light fixture is not a free choice.
Making the RCP in Revit and ArchiCAD
In Revit, ceiling plan views are created with View tab, Create panel, Plan Views, Reflected Ceiling Plan (Revit also creates them when you add levels). The view looks up from its cut plane, usually set above door and window heads; if an RCP comes out blank, the cut plane is often above the ceiling. Ceilings are modelled with Architecture tab, Build panel, Ceiling, either automatically within walls or by sketching a boundary; the surface pattern of the ceiling's material draws the grid.
ArchiCAD has no dedicated ceiling plan view type. Offices usually build the RCP from the floor plan with layer combinations and model view options, or generate a ceiling view through a 3D document; check your office template.
Common mistakes
- Ceiling heights on the RCP that disagree with the sections or interior elevations.
- No grid origin shown, leaving slivers of tile at the walls.
- Devices placed off the grid or across tile joints.
- Sprinklers, lights, diffusers and detectors placed by different engineers without coordination.
- No access panels under valves, dampers and other equipment that needs service.
- A ceiling height that the ductwork and structure above cannot fit under.
- Reading the RCP without its legend.
Frequently asked questions
What is a reflected ceiling plan?
A plan of the ceiling drawn as if reflected in a mirror on the floor, so it has the same orientation and scale as the floor plan. It shows ceiling types, heights and everything mounted in the ceiling.
Why is it called a reflected ceiling plan?
Because the ceiling is projected downward as if reflected, rather than drawn as seen looking up, which would mirror it. That keeps it aligned with the floor plan.
What is the difference between an RCP and a floor plan?
The floor plan shows what is at floor and wall level, cut about 4 feet (1.2 m) above the floor. The RCP shows what is at the ceiling, at the same scale and orientation.
What does AFF mean on a ceiling plan?
Above finished floor: the ceiling height measured from the finished floor surface.
Who prepares the reflected ceiling plan?
The architect or interior designer, with lighting, HVAC, sprinkler and fire alarm devices coordinated from the engineers' drawings.
Ncored is the desktop PDF editor we built in our architecture studio for drawing sets from AutoCAD, Revit, and ArchiCAD, on Windows and Mac (Apple Silicon). Large ceiling plans stay smooth to zoom and pan, so you can check every device across a floor. Measure to scale (metric units), cloud a clash and leave a comment on it, and compare two issues of the RCP as a colour overlay to see which devices moved. Markups are saved as standard PDF annotations that open in Acrobat, Bluebeam, Preview and other standard PDF viewers. 14 days free. No signup, no email, nothing to enter.
Related: how to read MEP drawings, MEP coordination with PDF drawings, plans, sections and elevations.
All product names, standards and organisations mentioned on this page are trademarks or registered names of their respective owners and are used for identification only. Ncored is an independent product by Noir architects and is not affiliated with, sponsored by, or endorsed by any of them. This page explains common drawing conventions and is not code advice; the project's drawings, specifications and adopted codes govern. Individual experiences may vary.