General Carpentry #

Skill Level: Intermediate (Level 2) #

Estimated Time: 4-8 Hours per Wall #

Introduction #

Additionally, this is a supplemental guide for walls 7 to 14 feet wide — the range where single boards no longer span the full wall. The complete step-by-step process to install shiplap is covered in our core guide: How to Install Shiplap, 0′ to 7′. Read that guide first. Everything below assumes you know the standard horizontal, vertical, herringbone, and chevron processes and focuses only on what changes when wall width exceeds a single board length.

Furthermore, most shiplap boards come in 8-foot lengths, and some suppliers carry 10- or 12-foot boards. Once your wall exceeds the board length, you must introduce end-to-end butt joints within each course. Managing these joints — where they land, how they’re staggered, and how they’re supported — is the primary new skill for this wall size range. The installation fundamentals don’t change; the planning complexity does.

What Changes When You Install Shiplap on Longer Walls #

• Butt joints are required. No single board spans the wall, so every course has at least one end-to-end joint where two boards meet.
• Joint staggering is critical. Joints must be offset by at least 2 stud bays (32″ minimum) between adjacent courses. Random stagger looks better than a repeating pattern.
• Every joint must land on a stud. Both board ends at the joint need solid nailing — never float a joint between studs.
• Level drift compounds faster. A 12-foot wall amplifies small level errors more than a 6-foot wall. Check level more frequently.
• Material waste increases slightly. You’ll have cutoff pieces from each course. Plan board lengths so cutoffs from one course can start the next — this is the most efficient use of material.
• You may need a second pair of hands. Holding a 10- or 12-foot board level while nailing is awkward alone. A helper or temporary support cleat makes installation faster and more accurate.

Additional Materials for Long Walls #

Moreover, everything in the core guide tool list, plus:

• Longer boards when available — 10′ or 12′ boards reduce joint count. If your supplier carries them, order these for walls over 8′. The extra cost is worth fewer joints.
• Temporary support cleat — a scrap piece of 1x material screwed to the wall at your working height. Rest the board on it while you position and nail. Remove after each course progresses past it.
• Extra brad nails — each joint gets 4 nails (2 per board end), so longer walls use 20-30% more fasteners than short walls.

How to Plan Joint Layout #

However, joint planning is the single most important addition for walls in this size range. Poor joint layout creates visible vertical lines that ruin the finished look. Good joint layout makes the seams disappear.

The Stagger Rule #

Consequently, no two adjacent courses should have joints within 32″ of each other (2 stud bays on 16″ centers). Ideally, stagger by 3-4 stud bays (48-64″). Random stagger always looks better than a repeating pattern. If every joint steps exactly 32″ to the right, the eye picks up the diagonal line. True random placement — sometimes stepping left, sometimes right, varying the offset — reads as natural.

The Cutoff Strategy #

Additionally, when you install shiplap on a 10-foot wall with 8-foot boards, the first board leaves a 2-foot gap. Cut a 2-foot piece to finish the course. That board you cut is now 6 feet long. Start the next course with the 6-foot cutoff. Its joint will land 6 feet from the starting wall — well clear of the first course’s joint at 8 feet. This cascading cutoff approach minimizes waste and automatically creates good stagger.

Pro Tip: Before cutting, dry-lay 3-4 courses on the floor to map out your joint pattern. Mark where each joint lands. If two joints end up within 24″ of each other vertically, adjust board lengths to push them apart. Five minutes of planning saves hours of reinstallation.

Joints on Studs #

Every butt joint must land directly over a stud. Both board ends at the joint get nailed — two brads per end, for a total of four nails at every joint. If a joint lands between studs, the board ends will eventually separate, bow, or telegraph a visible gap. This is the one rule you cannot bend on walls over 7 feet.

What’s Different Step-by-Step to Install Shiplap #

Follow the core guide for each orientation. The modifications below apply to all orientations (horizontal, vertical, herringbone, chevron).

Step 1 (Layout) — Add Joint Planning #

Same layout process, but add a joint plan. After calculating course count and checking for thin rows at top/bottom, map out where joints will fall. Mark stud locations on the wall first, then sketch joint positions on paper or directly on the wall. Verify every planned joint lands on a stud.

Step 2 (First Course) — No Significant Change #

Same process. The first board may not span the full wall, so you’ll cut a fill piece. Ensure both the full board and the fill piece are level — check across the seam. Nail both ends of each board at the joint into the stud.

Steps 3-4 (Build Up / Outlets) — Add Level Checks and Joint Nailing #

Same course-by-course process, but:

• Check level every 3 courses (not every 4-5 as in the core guide). Longer walls amplify drift faster.
• Butt joints must be tight. Push the second board firmly against the first before nailing. A small gap (even 1/16″) at a joint becomes a dark line that draws the eye. If boards have shrunk slightly from acclimation, apply a thin bead of wood glue at the joint end grain.
• 4 nails per joint — 2 brads in the end of each board, one high and one low. Both board ends must be locked to the stud independently.

Step 5 (Top Row / Finish) — No Significant Change #

Same process. Fill nail holes at joints with the same wood filler used on stud nails. Sand flush. If boards were pre-finished, touch up joint ends where the cut exposed raw wood.

Vertical Orientation — Additional Notes for Long Walls #

On walls 7-14 feet wide with vertical shiplap, the primary concern isn’t butt joints (boards typically reach floor to ceiling without joining). Instead, the challenge is maintaining plumb across a wider span and the increased number of furring strips needed.

• More furring strips. Wider walls mean more horizontal blocking. Install furring strips at the same 16-24″ vertical spacing, but verify each strip is level — a bowed furring strip on a wide wall pushes boards out of plane.
• Check plumb every 4-5 boards and correct gradually. On a 14-foot wall, even 1/8″ of lean per board compounds to over 1″ by the far side.
• Left and right edge boards must still be equal width. Calculate this more carefully on wide walls — the rounding error from integer division becomes more visible when the edge boards are far apart.

Angled Patterns (Herringbone/Chevron) — Notes for Wider Walls #

When installing herringbone or chevron patterns on walls wider than 7 feet, the plywood backer requirement from the core guide becomes more important:

• Plywood seams. Standard 4×8 sheets won’t cover the wall in one piece. Stagger plywood seams so they don’t line up behind shiplap joints. Landing a shiplap joint directly on a plywood seam can allow flex and open the joint over time.
• Wider walls = more pattern repeats. The herringbone zigzag or chevron V repeats more times across the wall, making any angular inconsistency more visible. Use a digital angle gauge to verify your saw stays at exactly 45° throughout the project.
• Construction adhesive is mandatory. On wider walls, angled boards have more leverage to shift. Use adhesive on every board, not just problem spots.

Quality Check — Additions for Long Walls #

Complete the full core guide quality checklist, then verify:

• ✅ No two adjacent courses have joints within 32″ of each other
• ✅ All butt joints are tight (no visible gaps or dark lines)
• ✅ Every joint lands on a stud (no floating joints)
• ✅ Joint nail holes filled and touched up so they match stud nail holes
• ✅ Level is consistent across the full wall width — check at left, center, and right
• ✅ No repeating stagger pattern visible (joints should appear random)

Troubleshooting — Long Wall Issues #

Joints opening up after installation #

Board ends are shrinking due to humidity changes. The end grain absorbs and releases moisture faster than the face grain. Prevention: apply wood glue to both end-grain faces before butting them together. For installed joints with gaps, fill with color-matched caulk — it stays flexible, unlike wood filler which cracks when boards move seasonally.

Visible vertical line from stacked joints #

Two or more courses have joints too close together, creating a visible vertical seam line. Remove the boards from the worst offending courses and re-cut to stagger the joints farther apart. Minimum 32″ offset, ideally 48″+. This is why dry-laying courses on the floor first matters — catching this during planning takes minutes; fixing it after nailing takes hours.

Board ends not flush at joints #

One board end is slightly proud (raised above the adjacent board surface) at the joint. Causes: board thickness varies between pieces, or the stud face isn’t perfectly flat. Fix by sanding the proud edge flush, or shimming behind the lower board to bring it up. Apply slight pressure pushing both boards down onto the course below to keep the lap joint engaged.

Level drifting across the full wall width #

The wall itself may not be flat or plumb. On walls over 10 feet, minor framing irregularities create waves in the shiplap surface. Fix by adding shims behind boards at low spots. Check with a long straightedge across the wall surface — if you see daylight gaps, shim those areas before continuing upward.

Helpful Resources #

These external resources provide additional detail on shiplap installation techniques for longer walls:

• Family Handyman – Shiplap Wall Ideas — Design inspiration and layout tips for various wall sizes
• This Old House – How to Install Shiplap — Professional techniques including joint management on long runs

Related Guides #

• Core Guide: How to Install Shiplap, 0′ to 7′ — Complete installation process for all four orientations
• How to Install Shiplap 3, 14’+ — What changes for walls over 14 feet including multi-piece runs and scaffolding
• How to Install Shiplap 4, Ceiling — Overhead installation techniques and gravity challenges
• How to Install Shiplap on a 3-Sided Fireplace Under 10′ — Mitered corners and heat clearance for fireplace wraps