DecoMoldings

inspiration · Picture Frame

F&B Ammonite Chair Rail Molding

F&B Ammonite Chair Rail Molding: wall elevation, color data (LRV 69), living room layout for 12, 15, 18 ft walls, cut list, calculator and pre-cut kits.

Catalog snapshot View 2 sources ↓

Project calculator

Wall molding linear-foot estimate

Estimate for rectangular molding frames.

Estimated quantity50.93 linear feet

Divide by 7.87 ft (240 cm stick) and round up for the number of sticks.

Formula & assumptionsframe_count * 2 * (frame_width_inches + frame_height_inches) / 12 * (1 + waste_percent / 100)

Assumes identical rectangular frames. The waste allowance is editable. The estimate does not optimize cuts or include separate rails, baseboards, or other trim.

Overview

F&B Ammonite is a light gray with a warm (yellow) undertone and a calculated LRV of 69. Against white trim the contrast ratio is 1.28:1, which gives almost no contrast, so the molding reads through shadow alone (a tone-on-tone look); painted tone-on-tone, the picture frame pattern shows only through its shadow lines.

Picture Frame layout on a 15 ft living room wall

A single horizontal rail at one third of the wall height, often used to split two paint colors. On a 15 ft wall with an 8 ft ceiling this gives 6 frames per row, each 25.3 in wide, 21 in tall. The layout uses about 5.03 m of 2.5 cm molding, or 3 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 picture frame pattern

Each frame is four pieces of 2.5 cm molding with 45 degree miters. Set the frames out from the center of the wall, keep every gap equal, and let the margins at the corners match the gaps.

Painting molding in F&B Ammonite

Grays sit in the middle of the contrast range: white trim reads clearly, while same-color trim gives a quiet, architectural look.

Wall elevation

F&B Ammonite wall, tone-on-tone trim, picture frame layout on a 15 ft wall. Colors are screen approximations.

Color data

ColorBrandCodeHexCalculated LRVUndertoneDepthContrast vs white trimContrast vs black trim
F&B AmmoniteFarrow & Ball#DDD8CF69warm (yellow)light1.28:111.61:1

Trim color pairings

PairingTrim colorHexContrastEffect
tone-on-toneF&B Ammonite#DDD8CF1:1Trim painted the same color as the wall
matching whiteSW Greek Villa#F0ECE21.2:1White with the closest undertone
contrastBlack#1F1F1F11.61:1Dark trim for a graphic outline

Living Room wall sizes: picture frame chair rail layout

Wall widthFrames per rowFrame widthFrame height (upper / lower)Molding incl. 10% waste240 cm sticksChair rail pieces (300 cm)
12 ft524 in21 in4.02 m22
15 ft625.3 in21 in5.03 m32
18 ft726.3 in21 in6.04 m32

Cut list for a 15 ft wall

Planning cut list
PieceQuantityLength
Chair rail2300 cm lengths, 15 ft run

Pre-cut kits for this wall

Pre-cut kits that fit this project. Open a kit for photos, options and pricing.

Chair Rail Half Wall Wainscoting Kit, 6 cm Rail | Self-Adhesive Easy Installation01 / KIT

Chair Rail Half Wall Wainscoting Kit, 6 cm Rail | Self-Adhesive Easy Installation

From $39.41

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Half Wall Wainscoting Kit with 4 cm Chair Rail | Self-Adhesive Easy Installation02 / KIT

Half Wall Wainscoting Kit with 4 cm Chair Rail | Self-Adhesive Easy Installation

From $33.41

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Board and Batten Half Wall Paneling Kit with Chair Rail | Pre-Cut MDF Easy Installation03 / KIT

Board and Batten Half Wall Paneling Kit with Chair Rail | Pre-Cut MDF Easy Installation

From $31.42

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Chair Rail Wall Molding Kit, 3 Upper & 3 Bottom Picture Frames | Easy Installation04 / KIT

Chair Rail Wall Molding Kit, 3 Upper & 3 Bottom Picture Frames | Easy Installation

From $165.00

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Chair Rail Molding Kit with Half Wall Wainscoting, 6 cm Rail | Self-Adhesive05 / KIT

Chair Rail Molding Kit with Half Wall Wainscoting, 6 cm Rail | Self-Adhesive

From $39.41

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Questions

How much molding do I need for a 15 ft living room wall with picture frame frames?

About 5.03 m (17 linear ft) including a chair rail and 10% waste, which is 3 sticks of 240 cm. That assumes 6 frames per row, 25.3 in wide, on an 8 ft ceiling.

Is F&B Ammonite warm or cool?

F&B Ammonite has a warm (yellow) undertone and reads as a light gray. Its calculated LRV is 69, so it reflects a lot of light and keeps molding shadows soft.

Should trim be the same color as F&B Ammonite walls?

Painting the molding the same color gives a modern, tone-on-tone finish where only shadows show the pattern. White trim adds almost no contrast, so the molding reads through shadow alone (a tone-on-tone look) (1.28:1), and black trim gives 11.61:1.

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.

Trace the details

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.

  1. Paint color dataset (screen approximations; LRV calculated)Recorded November 11, 2026
  2. DecoMoldings product catalogRecorded November 11, 2026