The size of a ceiling medallion is the single most important decision in the install. The right size frames the fixture and the room; the wrong size either disappears or overwhelms.
The basic rule of thumb: the medallion's diameter should be approximately twice the diameter of the light fixture. A 400 millimeter chandelier gets a 700 to 800 millimeter medallion. A 600 millimeter chandelier gets a 1.0 to 1.2 meter medallion. A 200 millimeter flush mount gets a 400 to 500 millimeter medallion.
The room size is the second factor. A small room (under 15 square meters) wants a smaller medallion (300 to 500 millimeters) so the medallion doesn't dominate the ceiling. A medium room (15 to 30 square meters) wants a medium medallion (500 to 800 millimeters). A large room (30+ square meters) or a room with high ceilings (3+ meters) wants a large medallion (800 millimeters to 1.5 meters).
The ceiling height is the third factor. A room with low ceilings (under 2.4 meters) wants a smaller, flatter medallion so the medallion doesn't visually lower the ceiling. A room with high ceilings (3+ meters) can carry a more developed, larger medallion.
The viewing distance is the fourth factor. A medallion in a hallway is seen from close range and at an angle, so the detail matters more than the size. A medallion in a foyer is seen from across the room and from below, so the size and the silhouette matter more than the fine detail.
The design style is the fifth factor. A simple smooth medallion reads at a smaller size than a detailed acanthus medallion, because the eye reads the overall shape rather than the ornament. A detailed medallion needs to be larger so the ornament is visible from a normal viewing distance.
For sourcing, most factories offer each medallion design in three to six standard sizes, with the geometry scaled proportionally. The factory can also produce custom sizes on longer lead times, but the standard sizes are usually the right answer. The right conversation is about the room dimensions, the fixture size, and the design style.
A practical install note: the medallion is installed around the existing light fixture, with the fixture's mounting hardware passing through the center of the medallion. The medallion is glued to the ceiling with construction adhesive and secured with screws into the ceiling joist or with toggle bolts. The wiring is reconnected after the medallion is in place.
---
Frequently Asked Questions
Q: What is a PU ceiling medallion?
A: A PU ceiling medallion is a decorative polyurethane molding that frames a chandelier, ceiling fan, or pendant light. It hides wiring holes and adds architectural depth to flat ceilings. PU medallions weigh roughly 1/4 of equivalent plaster pieces and ship primed and paint-ready.
Q: How do you install Ceiling roses and medallions?
A: First, isolate power to the light fixture at the breaker. Apply a continuous bead of polyurethane construction adhesive to the back of Ceiling roses and medallions, lift it into place around the existing fixture, and press firmly against the ceiling. For heavy medallions (≥30 inches), drive two finish nails through the medallion into a ceiling joist. Patch nail heads, spackle the seam, sand smooth, and paint.
Q: What size ceiling medallion should I use?
A: Match medallion diameter to room and fixture size. A 12–18 inch medallion suits standard 8 ft ceilings and small pendants. 20–30 inch medallions anchor chandeliers in dining rooms and entryways. Use an oval medallion (e.g. 20×30 inch) over rectangular tables. The medallion should be roughly twice the diameter of the chandelier canopy.
Q: Are PU ceiling medallions paintable?
A: Yes — every PU medallion we produce arrives with a factory primer that bonds to any interior latex, acrylic, or oil-based paint. Most decorators apply two finish coats. For a metallic or antique look, use a base coat of acrylic latex followed by a glaze and dry-brush highlight.