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How To Finish Shiplap Edges

ByBrooke Grasley

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Finishing shiplap edges is the part that makes the difference between “DIY weekend project” and wow… that looks like a pro did it

The good news? You don’t need fancy tools or complicated trim work. You just need to pick the right finish for where your shiplap ends — outside corner, inside corner, ceiling line, window/door, or a random open edge

In this guide, I’ll walk you through the easiest ways to finish shiplap edges, when to use each one, and exactly how to do it

how to finish shiplap edges before

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Quick answer: What’s the easiest way to finish shiplap edges?

Most of the time, the easiest (and cleanest) option is:

  • Outside corners: use outside corner trim (simple, forgiving, looks finished)
  • Ends that stop on a wall: use a small trim board or L-trim
  • Around windows/doors: use trim casing (like you would around any window)
  • Tiny gaps: paintable caulk + paint

If you want the “no trim” look, the easiest beginner-friendly method is the return edge (I’ll show you exactly how)

Tools + materials you’ll need (simple list)

You probably already have most of this

Tools

  • Tape measure
  • Pencil
  • Level (or a straight edge)
  • Miter saw or hand saw (miter saw is easiest)
  • Nail gun (or finish nails + hammer)
  • Caulk gun
  • Sanding block

Materials

  • Trim boards (depends on method)
  • Wood filler
  • Paintable caulk
  • Primer + paint (or paint + trim paint)

DIY tip: You don’t need expensive trim. Even a simple 1×2 or 1×3 can look amazing once it’s caulked + painted

Before you start: pick your “edge type”

This is the key. Find the situation that matches your wall:

  1. Outside corner (two walls meet and wrap outward)
  2. Inside corner (two walls meet inward)
  3. Open end (shiplap stops mid-wall or on one side)
  4. Window or door edge
  5. Top edge (where shiplap meets the ceiling)
  6. Bottom edge (where shiplap meets baseboards)

Now let’s go method by method

Method 1: Outside corner trim (best for beginners)

If you want the easiest option with the cleanest finish, this is it

Outside corner trim hides uneven cuts, covers tiny gaps, and makes corners look crisp

Best for: beginners, textured walls, older homes that aren’t perfectly square
Looks like: clean “finished wall” with a trim corner

Steps

  1. Install your shiplap up to the corner on both walls
  2. Measure the height of the corner from floor to ceiling
  3. Cut your outside corner trim to length
  4. Place the trim so it covers both edges evenly
  5. Nail it in place (hit studs if you can)
  6. Fill nail holes with wood filler
  7. Caulk the edges where trim meets shiplap
  8. Paint (or touch up)
caulk edges Shiplap Wall corners

Pro tip: If your walls are a little wavy, use caulk to hide any tiny gaps — it makes it look seamless

Method 2: L-trim or edge trim (clean modern finish)

L-trim (sometimes called edge trim) gives a simple, modern finish without looking bulky

Best for: shiplap ends that stop on one side, modern style rooms
Looks like: clean edge with a small “frame” finish

Steps

  1. Measure the full length of the edge you need to cover
  2. Cut your L-trim to size
  3. Dry fit it first (make sure it covers the raw edge)
  4. Nail it in place
  5. Fill holes
  6. Caulk lightly (don’t overdo it)
  7. Paint
quarter round trim edge Shiplap Wall

Pro tip: L-trim is great when you want a clean finish but don’t want a chunky corner piece

To make it even easier, have Home Depot or your local store cut the trim for you.

Method 3: Return edge (best “no trim” look for beginners)

If you love the seamless “no trim” look, a return edge is the easiest way to do it without needing perfect cuts

A return edge means you cut a small piece of shiplap that wraps the edge so you don’t see the raw end grain

Best for: feature walls, fireplace walls, shiplap that stops mid-wall
Looks like: finished edge that blends in

Steps

  1. Install your last full shiplap board like normal
  2. Measure the thickness of the shiplap + wall (you only need a small wrap piece)
  3. Cut a thin strip of shiplap to wrap the edge
  4. Cut a small piece for the front face if needed
  5. Attach with construction adhesive + a few nails
  6. Fill seams lightly with wood filler
  7. Sand smooth
  8. Prime + paint
corner trim on white Shiplap Wall

Method 4: Finish shiplap edges where it meets drywall (simple trim board)

If your shiplap stops on one side and meets drywall (like a half wall, hallway, or accent wall), the easiest finish is a simple trim board like a 1×2 or 1×3

Best for: accent walls, one-wall shiplap, DIY feature walls
Looks like: framed-in edge (very intentional)

Steps

  1. Measure the height/length of the edge
  2. Choose a trim board width that looks balanced (1×2 is usually perfect)
  3. Cut to size
  4. Nail into studs if possible
  5. Fill nail holes
  6. Caulk both sides
  7. Paint
modern trim edge on Shiplap Wall

Pro tip: This is one of the most forgiving options — it hides uneven edges instantly

Method 5: Around windows and doors (keep it simple)

If you’re adding shiplap around a window or door, treat it like trim work — don’t overthink it

Best for: any shiplap wall with windows/doors
Looks like: standard clean casing trim around the opening

Steps

  1. Install shiplap up to the window/door edge
  2. Add casing trim around the window/door (top and sides)
  3. Add a sill if you want it to look extra finished
  4. Caulk seams
  5. Fill holes
  6. Paint

Beginner tip: If your cuts around the window aren’t perfect, casing trim covers it — that’s why it’s the easiest option

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Method 6: Where shiplap meets the ceiling (clean options)

You have two easy choices:

Option A: Leave it clean (modern look)

If your ceiling line is straight, you can finish the top with caulk + paint and call it done

Option B: Add crown molding (traditional look)

If you want a more classic look, crown molding gives a finished edge

Pro tip: If the ceiling line is uneven, trim is usually easier than trying to caulk a wavy gap

Common shiplap edge problems (and easy fixes)

These are the things that trip up average DIYers — and how to fix them fast

“My corners have gaps”

  • Use corner trim OR caulk and paintable filler
  • Walls are rarely perfectly square — trim makes it forgiving

“My edge looks rough”

  • Sand lightly
  • Use wood filler on the end grain
  • Prime before painting

“My caulk cracked”

  • Use paintable caulk meant for trim (not the cheapest one)
  • Don’t apply it too thick

“My seam is showing through paint”

  • Do a second coat of paint
  • Prime first (this matters more than people think)

Final thoughts

If you’re an average DIYer and you want the easiest, most professional-looking finish, here’s the cheat sheet again:

  • Tiny gaps: caulk + paint
  • Outside corners: outside corner trim
  • Accent wall ends: simple trim board (1×2 or 1×3)
  • No-trim look: return edge
  • Windows/doors: casing trim

Love Shiplap? Explore These Popular Wall and Fireplace Ideas

Shiplap is one of the easiest ways to add character, texture, and farmhouse charm to a space. If you’re planning a project, these ideas will give you even more inspiration.

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