DecoMoldings

Installation plan · Arched

How to Install Arched Wall Molding on Textured Walls

Plan a arched installation with a dated workflow, material checklist, and links to related catalog guides.

Evidence reviewed View 2 sources ↓

Project calculator

Wall molding linear-foot estimate

Estimate for rectangular molding frames.

Estimated quantity122.28 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

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 on textured walls 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. Self-adhesive backing does not grip heavy texture; use the non-adhesive kit.

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

White wall, tone-on-tone trim, arched layout on a 15 ft wall. Colors are screen approximations.

Living Room wall sizes: arched accent wall layout

Wall widthFrames per rowFrame widthFrame height (upper / lower)Molding incl. 10% waste240 cm sticksChair rail pieces (300 cm)
12 ft431 in50 / 21 in32.26 m142
15 ft531.2 in50 / 21 in40.43 m172
18 ft631.3 in50 / 21 in48.6 m212

Cut list for a 15 ft wall

Planning cut list
PieceQuantityLength
Frame top and bottom (lower row)1031.2 in
Frame sides (lower row)1021 in
Arch frame sides (upper row)1034.4 in
Arch top + bottom rail (upper row)531.2 in span
Chair rail2300 cm lengths

Steps: on textured walls

order: 1; text: Self-adhesive backing does not grip heavy texture; use the non-adhesive kit.; items: Sanding pole · Joint compound · Caulk

order: 2; text: Sand the texture flat along the molding lines or skim a strip of joint compound.; items: Sanding pole · Joint compound · Caulk

order: 3; text: Fix the molding with joint compound or construction adhesive.; items: Sanding pole · Joint compound · Caulk

order: 4; text: Caulk both edges to hide the texture behind the trim.; items: Sanding pole · Joint compound · Caulk

Pre-cut kits for this wall

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

U Shaped Arch Wall Trim Molding Kit | Pre-Cut MDF Medium & Large01 / KIT

U Shaped Arch Wall Trim Molding Kit | Pre-Cut MDF Medium & Large

From $81.40

View kit
Flexible Arched Wall Molding, Paintable MDF Wall Trim, Pre-Cut Arch Decorative Wall Panels | Picture Frame Molding, Accent Wall Trim02 / KIT

Flexible Arched Wall Molding, Paintable MDF Wall Trim, Pre-Cut Arch Decorative Wall Panels | Picture Frame Molding, Accent Wall Trim

From $73.60

View kit
Flexible Arch Trim Wall Molding Kit | Pre-Cut MDF Decorative Wall Panels03 / KIT

Flexible Arch Trim Wall Molding Kit | Pre-Cut MDF Decorative Wall Panels

From $83.40

View kit
Arch Molding Kit, 3 Widths | Flexible Pre-Cut MDF Arch Trim for Accent Walls04 / KIT

Arch Molding Kit, 3 Widths | Flexible Pre-Cut MDF Arch Trim for Accent Walls

From $58.40

View kit
Double Arched Wall Molding Set | Pre-Cut MDF Decorative Wall Panels05 / KIT

Double Arched Wall Molding Set | Pre-Cut MDF Decorative Wall Panels

From $133.60

View kit
Arched Accent Wall Trim Molding Kit, 3 Widths | Pre-Cut MDF06 / KIT

Arched Accent Wall Trim Molding Kit, 3 Widths | Pre-Cut MDF

From $58.40

View kit

Questions

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.

Trace the details

Sources & dates

This is a planning workflow, not a substitute for the selected product manufacturer's installation, safety, fastening, or cure instructions.

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