Installation plan · Arched
How to Install Arched Wall Molding Around Windows and Doors
Plan a arched installation with a dated workflow, material checklist, and links to related catalog guides.
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Overview
Upper frames finish in a half-round arch instead of a flat top. The curve softens a headboard or reading-nook wall. Soft curves behind beds, in nurseries and entryways.
Why around windows and doors need a plan
Upper frames finish in a half-round arch instead of a flat top. The curve softens a headboard or reading-nook wall. Treat the window or door casing as a fixed edge and lay frames out from it.
Building the arched pattern
Arched tops are pre-formed in MDF; the straight sides and the bottom rail are cut to the same width as the arch. Fix the arch first, then hang the sides from it.
Wall elevation
Living Room wall sizes: arched accent wall layout
| Wall width | Frames per row | Frame width | Frame height (upper / lower) | Molding incl. 10% waste | 240 cm sticks | Chair rail pieces (300 cm) |
|---|---|---|---|---|---|---|
| 12 ft | 4 | 31 in | 50 / 21 in | 32.26 m | 14 | 2 |
| 15 ft | 5 | 31.2 in | 50 / 21 in | 40.43 m | 17 | 2 |
| 18 ft | 6 | 31.3 in | 50 / 21 in | 48.6 m | 21 | 2 |
Cut list for a 15 ft wall
| Piece | Quantity | Length |
|---|---|---|
| Frame top and bottom (lower row) | 10 | 31.2 in |
| Frame sides (lower row) | 10 | 21 in |
| Arch frame sides (upper row) | 10 | 34.4 in |
| Arch top + bottom rail (upper row) | 5 | 31.2 in span |
| Chair rail | 2 | 300 cm lengths |
Steps: around windows and doors
order: 1; text: Treat the window or door casing as a fixed edge and lay frames out from it.; items: Tape measure · Level · Pencil
order: 2; text: Keep the same margin around casings as between frames.; items: Tape measure · Level · Pencil
order: 3; text: Use narrower frames on the short wall sections beside openings rather than cutting a frame into the casing.; items: Tape measure · Level · Pencil
order: 4; text: Align frame tops with the window head where possible.; items: Tape measure · Level · Pencil
Pre-cut kits for this wall
Pre-cut kits that fit this project. Open a kit for photos, options and pricing.
01 / KITArched Accent Wall Trim Molding Kit, 3 Widths | Pre-Cut MDF
From $58.40
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02 / KITFlexible Arched Wall Molding, Paintable MDF Wall Trim, Pre-Cut Arch Decorative Wall Panels | Picture Frame Molding, Accent Wall Trim
From $73.60
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03 / KITModern Arched Wall Panel Kit: Pre-Cut MDF Wall Molding
From $140.00
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04 / KITDouble Arched Wall Molding Set | Pre-Cut MDF Decorative Wall Panels
From $133.60
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05 / KITArched Decorative Wall Molding Panels, 1 to 5 Arches | Pre-Cut MDF
From $146.40
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06 / KITHalf Wall Arched Wainscoting Panels Kit | Pre-Cut MDF Easy Installation
From $73.60
View kitQuestions
How much molding do I need for a 15 ft living room wall with arched frames?
About 40.43 m (133 linear ft) including a chair rail and 10% waste, which is 17 sticks of 240 cm. That assumes 5 frames per row, 31.2 in wide, on an 8 ft ceiling.
How high should the chair rail be in a living room?
About one third of the ceiling height: 32 in on an 8 ft ceiling, 36 in on 9 ft and 40 in on 10 ft. Center the layout on the sofa or TV rather than the wall when furniture is off-center.
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Sources & dates
This is a planning workflow, not a substitute for the selected product manufacturer's installation, safety, fastening, or cure instructions.
- Paint color dataset (screen approximations; LRV calculated)Recorded November 11, 2026
- DecoMoldings product catalogRecorded November 11, 2026