Reflected Ceiling Plan (RCP): What It Is and What It Shows
A reflected ceiling plan (RCP) is a plan view of a ceiling, drawn as if reflected in a mirror on the floor so that it lines up with the floor plan. In construction, RCP stands for reflected ceiling plan. It shows ceiling heights, the ceiling grid, soffits, lights, air diffusers, sprinkler heads and other items that sit in or hang from the ceiling. This guide explains the term, what the drawing contains, how to read its symbols, who uses it, and how an RCP of an existing building is produced from a laser scan.
What is a reflected ceiling plan
A reflected ceiling plan is a drawing of the ceiling of a room or building, and it is one of the standard sheets in a set of architectural drawings. Like a floor plan, it is a plan view: a flat drawing with north, walls and rooms in the same places. The Historic American Buildings Survey (HABS) guidelines of the National Park Service give a sample sheet sequence in which a floor’s reflected ceiling plan follows that floor’s plan. Unlike a floor plan, it does not cut through the walls about 3 to 4 feet above the floor and look down. It describes what is on the ceiling above.
The sheet is also called a ceiling plan or reflected ceiling plans (plural) when a project has one per floor. Drawing lists often shorten the name, so “RCP”, “RCP plan” and “RCP sheet” all mean this drawing. The meaning of RCP in construction is this sheet, not the point cloud file format covered near the end of this guide.
Why it is called reflected
The name comes from a drawing convention. Imagine a mirror laid flat on the floor, and look down into it from above. The mirror shows the ceiling, and that reflected image is what the drawing records, in the same orientation as the floor plan.
This matters in practice. If the ceiling were drawn looking up from the floor, the drawing would be a left to right mirror of the floor plan, and a light over the north-east corner of a room would appear in the wrong corner of the sheet. Because the ceiling is drawn as reflected, the corridor, the columns and the doors sit in the same places on both sheets, and the two can be laid over each other. A training course on blueprint reading describes the same idea: RCPs let architects and builders view information about the ceiling as if reflected from the floor.
What a reflected ceiling plan shows
Walls are drawn as on the floor plan, usually without door swings, and the ceiling elements are drawn on top of them. A typical RCP includes:
- Ceiling type and height. Each room is tagged with its ceiling type and its height above the finished floor. A room with a drop in the ceiling gets a second tag or a section line where the height changes.
- Ceiling grid. The layout of a suspended grid or the joint pattern of a gypsum board ceiling, with the grid tied to the walls so the tiles at the edges are not slivers.
- Soffits and bulkheads. Dropped sections that hide ducts, pipes or structure, drawn with their outline and a height note.
- Lights. Recessed, surface-mounted and pendant fixtures, with switching and emergency lights marked where the drawing is used for lighting layout.
- Air devices. Supply diffusers, return grilles and exhaust grilles.
- Sprinkler heads. Usually centered in a tile or dimensioned from the walls, as the fire protection drawings set them.
- Access panels, exit signs, speakers, smoke detectors and cameras. Anything mounted on the ceiling that someone has to find or reach.
- Materials and finishes. Acoustic tile, gypsum board, exposed structure, wood or metal panels, often with a finish schedule.
Sheet notes usually state that all ceiling heights are measured from the finished floor, and a legend defines the symbols for that project. A City Tech architecture course checklist asks for the same list: walls, a ceiling grid or gypsum board ceiling, lights, supply and return air devices, sprinkler heads, and dimensions locating each item on the ceiling.
Common RCP symbols
RCP symbols are drawn as small, simple shapes. The shapes vary between firms and between projects, and the legend on the sheet governs. Treat the table as a description of the usual idea, not as a fixed code.
| Item | How it is usually drawn |
|---|---|
| Recessed light fixture | A rectangle or square at the size of the fixture, often with diagonal lines or a letter tag that refers to the fixture schedule |
| Surface-mounted or pendant light | A circle or rectangle with a different line weight or a tag, so it is not mistaken for a recessed one |
| Supply diffuser | A square with an X, or a square inside a square, tagged with air flow |
| Return or exhaust grille | A square or rectangle with diagonal lines or slats, tagged |
| Sprinkler head | A small circle, often with a cross or a mark inside |
| Access panel | A small square with a label such as AP |
| Exit sign | A box or arrow shape with the word EXIT or an arrow showing the direction |
| Soffit or bulkhead | A dashed or solid outline of the dropped area, with a height note |
| Ceiling height change | A line between two areas with tags such as 9’-0” and 10’-0” AFF |
| Ceiling grid | A light grid of lines at the tile size |
Light fixture symbols on an RCP can be diagrammatic, and the electrical drawings and fixture schedule give the actual fixture type, so check the sheet notes. Because every trade’s ceiling-mounted items appear on the same sheet, the RCP is also where their positions are checked against each other.
Who uses a reflected ceiling plan
- Architects and interior designers lay out the ceiling grid, the heights and the finishes, and check that lights and diffusers fall where the room needs them.
- Mechanical, electrical and plumbing engineers place air devices, fixtures and sprinkler heads and coordinate them with each other above the ceiling.
- Contractors and subcontractors use it to set out the grid, hang drywall soffits, install lights and tiles, and check what has to be cut into the ceiling.
- Facility managers and building owners use it to find access panels, shutoffs and the ceiling type, and to know what must be moved when a space changes.
- Tenant improvement teams use it for fit-outs, where a tenant keeps, replaces or re-lays the ceiling of a leased space. The guide to as-built drawings for tenant improvements shows where the ceiling sheet fits in that set.
How an RCP of an existing building is made
For a new building the RCP is designed. For an existing building the question is different: what is above the ceiling line now? Old drawings often do not say. A tenant has moved a soffit, a lighting contractor has replaced the layout, and a duct has been added across a corridor.
A reflected ceiling plan of an existing building is drawn from measurement. The usual route is a laser scan:
- A terrestrial scanner records the room from several positions, and the scans are registered into one point cloud. Where there is a suspended ceiling, the scanner records the underside of the tiles, the lights and the grilles, and records the plenum only where tiles are removed or open.
- The walls and openings are taken from the floor plan slice, as on the floor plan. A thin horizontal slice of the cloud just under the ceiling, seen from below and flipped to the plan orientation, supplies the ceiling edges, soffits and devices.
- The ceiling elements are drawn in place: the height of each ceiling zone, the soffit outlines, the grid, and the lights, diffusers, grilles, sprinkler heads and access panels that are visible in the cloud.
- Heights are read from the cloud against the finished floor, and the sheet is annotated with ceiling types and a legend.
- The result is delivered as DWG and PDF, or the same ceilings are modeled in Revit when the project is a BIM project. The article on scan-to-BIM for ceilings and plenums covers the model side, including clash checks above the ceiling.
A laser scan sees what is exposed. It does not see behind a closed tile or a gypsum board ceiling, so hidden conduit, hangers and duct above a closed ceiling are drawn from other records or from openings made for the survey, and the sheet should say so. We deliver reflected ceiling plans in DWG and PDF, traced from a registered point cloud, as part of our as-built drawings scope, together with floor plans, elevations and sections.
RCP in point cloud work is a different thing
In laser scanning software, RCP is also a file extension. Autodesk ReCap uses two point cloud formats: an RCS file is a single point cloud scan, and an RCP file is a project file that points to the individual scan files and contains information about them. A scan project opened in Revit or AutoCAD is often linked as an RCP file.
The two uses have nothing to do with each other. A reflected ceiling plan is a drawing sheet; an RCP point cloud project is a data file. If a request says “RCP”, the context decides which one is meant. The step from a ReCap project to a model is described in the scan-to-Revit workflow.
FAQ
What does RCP stand for in construction?
RCP stands for reflected ceiling plan, a drawing of the ceiling drawn as if reflected on the floor. In laser scanning software it is also an Autodesk ReCap project file extension, which is a separate meaning.
What is a reflected ceiling plan?
A drawing that shows the ceiling of a room or building in plan, in the same orientation as the floor plan. It shows ceiling heights, grid, soffits, lights, air devices, sprinkler heads and access panels.
Why is it called a reflected ceiling plan?
The ceiling is drawn as the reflection seen in a mirror placed below it, viewed from above. That keeps the sheet in the same orientation as the floor plan, so the two line up.
What is the difference between a floor plan and a reflected ceiling plan?
A floor plan shows walls, doors and furniture cut about 3 to 4 feet above the floor and viewed from above. A reflected ceiling plan shows what is on the ceiling, in the same orientation, so items on both sheets align.
Who needs a reflected ceiling plan?
Architects, MEP engineers, contractors and facility managers use it, and it is a core sheet in tenant improvements and renovations where the ceiling is changed.
Can an RCP be drawn from a laser scan?
Yes. The ceiling elements visible in a registered point cloud are traced into a plan, with heights taken from the cloud. Elements hidden above closed ceilings are not seen by the scanner.
Is an RCP file the same as a reflected ceiling plan?
No. An RCP file is an Autodesk ReCap point cloud project file. A reflected ceiling plan is a drawing.
Sources
- National Park Service, HABS Guidelines for Measured Drawings: a sample sheet sequence with a floor’s reflected ceiling plan after its floor plan.
- Graduate School USA, Understanding the Reflected Ceiling Plan for Public Areas: ceiling as if reflected from the floor, ceiling type and height above the finished floor, fixture symbols.
- CUNY City Tech OpenLab, A-200 Series Reflected Ceiling Plans: course checklist for the contents of an RCP sheet (grid, lights, supply and return, sprinkler heads, dimensions).
- Autodesk Navisworks Help, ReCap File Reader: RCS is a single point cloud scan and RCP is a project file pointing to the scan files.
