Shiplap boards give interior walls the look of real wood without the cost of full paneling. The boards lock together at their long edges, so a wall goes up fast and comes apart just as quickly when the style changes. Wall treatments run from tile murals in shower walls to painted paneling in living spaces, and shiplap sits between them: it adds texture and a vintage, farmhouse, or traditional character while staying inside a weekend budget. A typical 100-square-foot accent wall takes 4 to 8 hours of work and $200 to $300 in materials, which makes it one of the most approachable wall upgrades a homeowner can take on.
What Shiplap Is and How It Works on Interior Walls
Shiplap began as exterior house siding: long, horizontal boards that overlap at the long edges. Each board laps the top quarter-inch of the board below it, forming a joint that sheds water and stays stable as the wood swells and shrinks. Interior shiplap keeps the same geometry but swaps materials. Softwoods such as pine and hemlock, or composite fiberboard, replace the heavier exterior grades, and the boards are thinner so the finished wall sits closer to the framing.
The catalog of wall-covering materials keeps growing. Modern building materials and the equipment used to process and install them now include pre-primed MDF panels, engineered tongue-and-groove boards, and PVC trim that mimics milled wood, and each one changes how shiplap is cut, fastened, and finished. What the board is made of matters more than the profile on its face.
Shiplap vs. Other Wall Panel Treatments
Shiplap competes with beadboard, board and batten, and textured drywall for the same accent-wall job. The four options differ in joint profile, material cost, and skill level, so the right pick depends on the room and the look you want.
| Treatment | Joint profile | Material cost per sq ft | Skill level |
|---|---|---|---|
| Shiplap | Flat rabbeted overlap | $2.00 to $3.00 | Beginner |
| Beadboard | Vertical V-grooves | $2.50 to $3.50 | Beginner |
| Board and batten | Wide boards with narrow strips | $1.50 to $2.50 | Intermediate |
| Textured drywall | Smooth or knock-down finish | $1.00 to $2.00 | Intermediate |
Interior vs. Exterior Shiplap
Exterior shiplap is thicker, often cedar or pressure-treated pine, and rated for direct weather exposure. Interior shiplap is thinner, lighter, and usually sold pre-primed. Keep the two separate: interior boards left outdoors cup and rot within a season, while exterior boards indoors add weight and cost without any benefit.
Planning the Project: Measurements, Materials, and Layout
Measure the wall in feet and multiply width by height for the square footage, then add 10 percent for waste from cuts, mistakes, and boards rejected for knots or warps. A 10-by-10-foot wall is 100 square feet, so the purchase order comes to roughly 110 square feet. A typical room runs 4 to 8 hours of working time and $200 to $300 in materials.
Work out the layout before you buy. Decide whether the boards run horizontally, which gives the modern farmhouse look and makes a room feel wider, or vertically, which reads chunkier and can make a ceiling feel taller. A step-by-step shiplap installation walkthrough from Bob Vila covers the same sequence, from measuring the wall to driving the last nail, and it is a useful reference when you are planning your own layout.
Estimating How Many Boards You Need
Shiplap sells by the square foot or by the piece. Divide your adjusted square footage by the coverage of a single board, which the label states. For a 100-square-foot wall with 110 square feet purchased and an 8-foot board that covers 6 square feet, you need about 19 boards, plus a couple of spares for mistakes.
- Measure the wall width and height at several points, because floors and ceilings are rarely square.
- Multiply the largest width by the largest height for a safe total.
- Add 10 percent for waste from cuts and defects.
- Divide by the coverage per board and round up.
Choosing Boards, Fasteners, and Adhesive
Pre-primed pine is the most common choice because it paints evenly and costs less than hardwoods. MDF and composite boards stay straighter but weigh more and tolerate moisture poorly. Buy the whole job at once from the same lot so the color and grain match, and let the boards acclimate in the room for 48 hours before installation.
- Pine: paints evenly, lowest cost, knots need extra primer.
- Hemlock: straight grain with fewer knots at a slightly higher price.
- MDF and composite: perfectly flat surfaces, heavier, sensitive to moisture.
Nail and Screw Patterns
Ringshank nails or 1.5-inch trim screws hold the boards to the wall framing. Drive fasteners through the tongue or the overlap so the next board hides them, and run a bead of construction adhesive down the back of each board for a quieter, firmer wall. Space the fasteners 12 to 16 inches apart along each stud line.
Preparing the Wall Surface Before Installation
Shiplap hides whatever is behind it, so the wall must be clean, dry, and sound before the first board goes up. Remove wallpaper, loose paint, and old trim that would make the new surface bulge, then fill large holes and knock down high spots with a drywall knife.
Clearing the Wall and Finding Studs
Run a stud finder across the wall and mark every stud, then snap vertical chalk lines so you have a fastening target for every row. Pull baseboards and door and window casings the shiplap will overlap, and set them aside for reinstallation or replacement.
Leveling, Straightening, and Moisture Checks
Walls are rarely flat. Sweep a long straightedge across the surface, mark the low and high points, and plan to shim the boards out at the low spots so the finished face reads flat. On exterior walls, check for dampness and drafts before covering anything; the same rules used to install foam sheathing properly, including thickness requirements and vapor barrier placement, apply when you want an insulated, airtight wall behind the paneling.
Installing Shiplap: Layout, Fastening, and Joints
Installation starts at the ceiling and works down, so gravity helps each overlap shed dust and any stray moisture. Snap a level reference line at the ceiling, even if the ceiling itself is out of level, and set the first board against that line.
Starting the First Row at the Ceiling
Cut the first board to length and check it against the reference line. Fasten it through the overlap into the studs, then slide the next board into place. Leave a small expansion gap at the top and bottom of the wall, and cover those gaps with crown molding and baseboard.
Keeping Rows Level and Joints Tight
Check the level every three or four rows, because a single crooked row multiplies across the wall. Stagger the end joints so they never line up in adjacent rows, which strengthens the pattern and hides it at the same time. Consistent overlap matters as much on a wall as it does on a roof, where proper lap and headlap on two-ply roof underlayment keep water from working its way into the assembly; the same logic governs every shiplap joint.
Handling Outlets, Switches, and Trim
Mark outlet and switch boxes on each board, cut the openings with a jigsaw or oscillating tool, and install box extenders so the devices sit flush with the thicker wall. Cut around windows and doors with a coping saw, and scribe the final board against the floor for a tight fit.
Finishing, Painting, and Ongoing Maintenance
Let the wall sit for a day so the wood settles, then fill nail holes with wood filler and sand the repairs smooth. Caulk the inside corners and the seams between boards for a seamless painted look, or leave the joints open for a more rustic finish.
Sanding, Filling, and Caulking
Sand with 120-grit paper, work with the grain, and wipe the dust away before priming. For walls that mix shiplap with painted drywall, the transition deserves the same care given to drywall joints; the techniques for an effortless drywall install, including taping and sanding sequences, keep those seams invisible under paint.
Painting and Sealing
Start with a quality primer, especially over knots in pine, then apply two coats of paint or a clear sealer. Latex paint is the standard choice because oil-based finishes amber over time. Touch up scratches with a small brush before they collect dirt, and re-caulk any seam that opens as the house settles.
Removing Shiplap, Repairs, and When to Call a Professional
One of shiplap’s advantages is that it comes off. Work a pry bar behind the bottom edge of each board and pull it free, starting at the floor and moving up. Nails pull through the softwood, so most boards survive and can be reused if you pry carefully at each stud.
Removing Shiplap Without Damaging the Wall
Score the painted seams with a utility knife before prying so the paint does not peel the wall surface. Remove boards in the reverse order of installation, bottom to top, and pull leftover nails with pliers. Patch torn drywall paper with joint compound once the boards are down.
Repairs and Common Mistakes
Warped boards, nail pops, and crooked rows account for most failures, and all three trace back to prep. Buy straight boards, fasten into studs, and check the level constantly. If a wall shows persistent dampness, find the source before covering it; moisture from plumbing or a saturated drain field behind the wall rots new boards from the back side, and fixing the drainage is far cheaper while the wall is still open.
When the project reaches the windows and doors, protect the work from the outside in. Installing flange windows with felt paper creates a weather barrier at the rough opening, so the interior shiplap stays dry and the wall assembly sheds water for years instead of seasons. Most walls are a straight weekend job; when you hit structural rot, sagging framing, or wiring that needs relocation, that is the point where a licensed contractor earns the fee.