inspiration · Arched
Traditional Arched Wall Molding
Traditional Arched Wall Molding: wall elevation, living room layout for 12, 15, 18 ft walls, cut list, calculator and pre-cut kits.
Project calculator
Overview
Upper frames finish in a half-round arch instead of a flat top. The curve softens a headboard or reading-nook wall. Traditional rooms (traditional and classic) typically use nested, french, picture frame layouts: Layered frames, a chair rail and contrasting white trim.
Arched layout on a 15 ft living room wall
Molding over the full wall height, upper and lower rows divided by a chair rail. On a 15 ft wall with an 8 ft ceiling this gives 5 frames per row, each 31.2 in wide, with 50 in upper and 21 in lower frames. The layout uses about 40.43 m of 2.5 cm molding, or 17 sticks of 240 cm, including 10% waste. Center the layout on the sofa or TV rather than the wall when furniture is off-center.
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.
Traditional look
Layered frames, a chair rail and contrasting white trim. Recommended layouts: nested, french, picture frame.
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 |
Pre-cut kits for this wall
Pre-cut kits that fit this project. Open a kit for photos, options and pricing.
01 / KITFlexible Arch Trim Wall Molding Kit | Pre-Cut MDF Decorative Wall Panels
From $83.40
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02 / KITHalf Wall Arched Wainscoting Panels Kit | Pre-Cut MDF Easy Installation
From $73.60
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03 / KITArch Molding Kit, 3 Widths | Flexible Pre-Cut MDF Arch Trim for Accent Walls
From $58.40
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04 / KITArched Accent Wall Trim Molding Kit, 3 Widths | Pre-Cut MDF
From $58.40
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05 / 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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06 / KITModern Arched Wall Panel Kit: Pre-Cut MDF Wall Molding
From $140.00
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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
Prices, options and photos come from our product catalog on the date shown. Layout tables are planning estimates; measure your wall before ordering.
- Paint color dataset (screen approximations; LRV calculated)Recorded November 11, 2026
- DecoMoldings product catalogRecorded November 11, 2026