Exterior crown molding is the finishing line of a building. Where a wall meets the roofline, parapet or soffit, a well-proportioned crown adds shadow, height and a sense that the facade was designed rather than simply assembled. It also does a practical job: a projecting cornice sheds rainwater away from the wall below. This guide covers where exterior crown molding is used, how to choose the right style and size, and which materials hold up outdoors.
The short version: Choose a crown whose size matches the height of the wall, in a material that will not rot, crack or warp outdoors. Mouldex exterior cornice mouldings have a lightweight, moisture-inert foam core with a hard cementitious coating. Browse 20 exterior cornice and crown moulding profiles.
Exterior Crown Molding vs. Cornice Moulding
The terms overlap. Crown molding usually means a single sloped or curved profile at the top of a wall. A cornice is the full crowning assembly at a roofline or parapet, which may combine a crown with other profiles, dentils or a frieze. On many homes and commercial buildings, one deep composite cornice moulding does the work that once took several layered pieces.
Where Exterior Crown Molding Is Used
- Rooflines and eaves: the classic location, finishing the top of the wall beneath the soffit.
- Parapets: on flat-roofed commercial, retail and multi-family buildings, a cornice caps the parapet and gives the building a finished top edge.
- Porches and entrances: a crown above a porch beam or entry surround adds presence at the front door, especially paired with pilasters.
- Window heads: a small crown above a window surround turns plain exterior window trim into a traditional pediment-style head.
- Floor lines: combined with band molding, a crown can separate storeys or mark a change of cladding.
Choosing the Right Style
- Traditional and classical: deeper profiles with a pronounced curve (ogee or cove), sometimes with stepped fillets, for Georgian, Colonial and Victorian facades.
- Transitional: simplified curves and clean steps that work on both new and traditional homes.
- Modern: crisp, squared or gently stepped profiles that add a strong shadow line without ornament.
For historic buildings, match the existing profile rather than choosing from a catalogue. Mouldex can replicate an existing cornice from a drawing, photo or sample; see our guide to replicating historic facade details.
Choosing the Right Size
Exterior crowns are seen from the street, often two or three storeys below, so they need to be larger than interior crowns to read correctly. A profile that looks generous in a showroom can disappear on a tall wall.
- Single-storey homes and porches: moderate profiles, such as the 8-inch Goulding.
- Two- and three-storey facades: deeper profiles with more projection, such as the Portland.
- Commercial parapets and large elevations: statement profiles such as the 18-inch Norton.
When in doubt, mock up a short length on the wall and view it from the street before ordering.
Exterior Crown Molding Materials Compared
| Material | Strengths | Drawbacks outdoors |
|---|---|---|
| Wood | Traditional look, easy to cut | Rots at joints and end grain; needs regular repainting |
| PVC / polyurethane | Moisture-resistant, light | Can move with heat; seams can show on long runs |
| Precast concrete / GFRC | Very durable, stone-like | Heavy; needs lifting equipment and structural support |
| Mouldex cement-coated foam core | Stone-like finish, lightweight, moisture-inert core, will not rot | Must be primed and painted after installation |
For a deeper comparison, read the different types of exterior moulding materials.
Installation Overview
- Confirm the substrate (stucco, EIFS, brick, stone veneer or sheathing) and the height of the crown line.
- Cut the profiles to length and mitre the corners.
- Adhere the crown to the wall with exterior adhesive, adding mechanical fasteners where the installation guidelines call for them.
- Seal the joints and the top edge so water sheds away from the wall.
- Prime and paint to match or contrast with the facade.
Frequently Asked Questions
What is the difference between exterior crown molding and cornice?
Crown molding is usually a single profile at the top of a wall; a cornice is the complete crowning assembly at a roofline or parapet. A single deep composite cornice moulding can often replace a layered cornice.
How big should exterior crown molding be?
Larger than you would use indoors. Scale the profile to the wall height: moderate profiles for single-storey walls and porches, deeper profiles for two- and three-storey facades and commercial parapets.
Can exterior crown molding be custom made?
Yes. Mouldex can match an existing crown or cornice from a drawing, photo or sample, which is ideal for additions and restorations.
Ready to finish your roofline? Shop exterior cornice and crown mouldings, order a free sample kit or send us your elevations.
