What Nails to Use for Shiplap: Gauge, Length & Penetration

The right nail for shiplap is a 15- or 16-gauge standard or painted trim nail. The length is chosen to ensure 1-1/4″ to 1-1/2″ of penetration into solid wood framing. For ceiling installations, Woodtone specifies nails must penetrate the framing member at least 1-1/2″ (38.1mm). You install them using a blind-nailing technique through the tongue of each board, which is a key part of knowing what nails to use for shiplap.

That penetration spec is the whole game for the what nails to use for shiplap question. Get it wrong, and the board doesn’t have enough wood to bite into. It’ll feel tight when you set it, but seasonal movement will work it loose over a single winter. The popping sound you hear six months later is a nail that didn’t reach deep enough giving up.

What follows is the manufacturer data on gauge, length, and spacing, plus the one technique that hides every nail, central to what nails to use for shiplap. This section explains when to switch from nails to screws, how to handle drywall, and what to do when a board threatens to split.

Key Takeaways

• Use 15- or 16-gauge standard or painted trim nails for almost all shiplap; length is chosen to achieve 1-1/4″ to 1-1/2″ penetration into solid framing.
• For ceiling installations, Woodtone specifies nails must penetrate the framing member at least 1-1/2″ (38.1mm), a 2″ or 2.5″ nail is typical.
• Blind-nail through the tongue at a 45-degree angle to hide the fastener; face-nail only the first and last boards where trim will cover it.
• When installing over drywall, add the drywall thickness (typically 1/2″) to your required penetration depth to calculate the correct nail length.
• Construction adhesive (like Loctite PL 510) is recommended by some manufacturers for extra hold, especially over plaster or hardboard, but never replaces mechanical fasteners.

The Core Specs: Gauge, Length, and Penetration

Nail gauge refers to the thickness of the wire. For shiplap, the consensus across Woodtone, UFP-Edge, Great American Spaces, and others is clear: 15-gauge or 16-gauge trim nails. The difference is minimal. A 15-gauge nail is slightly thicker and offers a bit more holding strength, while a 16-gauge nail leaves a smaller hole. Both are correct.

Common mistake: Using 18-gauge brad nails for structural holding. They’re too thin for the weight and seasonal movement of shiplap. An 18-gauge nail will hold initially but can work loose or shear under stress.

Length is where you do the math. The rule from UFP-Edge, Lowes, and The Home Depot guides is consistent: fastener length should provide 1 1/4″ to 1 1/2″ of penetration into solid wood. This isn’t the total nail length, but how much of the nail is buried in the stud or joist behind the board.

Installation Scenario	Minimum Penetration	Typical Nail Length	Notes
Direct to wall stud (no drywall)	1-1/4″ to 1-1/2″	1-1/2″ to 2″	For 3/4″ thick shiplap.
Through 1/2″ drywall into stud	1-1/4″ to 1-1/2″	2″ to 2-1/2″	Add drywall thickness to penetration depth.
Ceiling into joist (Woodtone spec)	1-1/2″ (38.1mm)	2″ to 2-1/4″	Their 2024 guide specifies this for nails; screws require 1″.
Into furring strip	1-1/4″ into strip	1-3/4″ to 2″	The strip itself must be securely fastened to framing.

The Woodtone guide adds a critical ceiling-specific number: for overhead work, nails must sink at least 1-1/2″ into the framing member. Gravity never sleeps, so that extra bite is insurance. Their recommended nails are hot-dipped galvanized or aluminum, 2-1/4″ 7d for smooth nails or 2″ 6d for ring or shank nails. 16-gauge brad nails are also approved.

The Great American Spaces guide calls for 2.5 in, 15- or 16-gauge standard or painted trim nails when installing through drywall into studs.

How to Nail Shiplap: The Blind-Nailing Technique

The goal is to hide every fastener. You achieve this by nailing through the tongue of the board, the protruding lip that tucks under the groove of the board above. The installed board above will cover the nail head.

Start with your first board at the bottom of a wall or the edge of a ceiling. This first board often can’t be blind-nailed because there’s no covering board below it. Here, you face-nail it, placing nails close to the edge where your baseboard or ceiling trim will later conceal them. Use a level. This first row sets everything that follows.

For every subsequent board:

1. Seat the board’s groove over the tongue of the installed board below.
2. Tilt your nail gun at a 45-degree angle down into the tongue.
3. Fire the nail through the tongue and into the framing behind.

The sound tells you if it’s right. A solid thunk means you hit the framing. A higher-pitched tap or a nail that doesn’t sink fully means you missed the stud, back it out and try again. Don’t just shoot another nail beside it; you’ll weaken the wood.

Apply trim nails in the shiplap tongue every 24 inches. When installing over plaster or hardboard, construction adhesive may be used for additional strength, but does not replace fasteners. . UFP-Edge Rustic Shiplap Installation Instructions

Spacing recommendations vary: UFP-Edge, Lowes, and The Home Depot specify nails every 24 inches, while Arauco calls for two nails per stud (which, on 16-inch centers, is every 8 inches). Most manufacturer guides, including those from UFP-Edge and Lowes, specify nails in the tongue every 24 inches. However, Arauco’s guide simply says “two finish nails per stud,” which on 16-inch stud spacing works out to every 8 inches, a much tighter pattern. When in doubt, follow the specific guide for your product. More nails in a row isn’t always better; it increases the chance of splitting the tongue.

Nails vs. Screws for Shiplap: When to Switch

Nails are the default for a reason. They have shear strength and a little flex, which handles wood movement better than brittle screws. But there are times a screw is the right tool.

Screws excel in overhead (ceiling) applications where withdrawal resistance, resistance to being pulled straight out, is critical. The Woodtone guide acknowledges this, stating screws for ceilings need only 1″ of penetration versus 1-1/2″ for nails. A #8 or larger screw, properly driven, won’t work loose.

The trade-off is visibility and effort. You must pre-drill and countersink every screw hole to avoid splitting the shiplap and to allow for putty. The Tilton Coffered Ceilings guide is explicit: “When using screws, you must pre-drill the planks with the appropriate sized drill bit and countersink as required.”

Fastener	Best For	Drawback	Key Spec
15/16-Gauge Trim Nail	Walls, most DIY projects.	Can work loose if penetration is insufficient.	1-1/4″ to 1-1/2″ penetration into framing.
Screw (#8 or larger)	Ceilings, high-stress areas.	Requires pre-drilling/countersinking; visible heads.	1″ penetration (ceilings, per Woodtone).
Ring-Shank Nail	Maximum holding power, prone-to-movement areas.	Harder to remove; can split wood if not careful.	2″ 6d size recommended by Woodtone.

My stance? Use a nail gun for 95% of the job. Save screws for the first and last board where you’re face-fastening and will fill the holes anyway, or for a ceiling where you’re genuinely worried about hold. The speed of a nail gun changes the project from a chore to a quick afternoon task.

Special Situations: Drywall, Furring Strips, and Exterior Use

Not every wall is open studs. Here’s how the nail choice adapts.

Installing Over Drywall or Plaster: The nail length rule still applies. You must penetrate the drywall/plaster, the air gap, and then sink 1-1/4″ into the stud. This usually demands a 2.5″ to 3″ nail. The Great American Spaces guide specifically calls out “2.5 in” nails for this scenario. If the walls are in moderately good condition, you can nail directly. The Tilton Coffered Ceilings guide recommends, but does not require, a construction adhesive such as Loctite PL 510 Wood & Panel or similar. The adhesive holds the board to the drywall substrate; the nails hold it to the framing.

Vertical Installation: You cannot nail vertical shiplap directly to studs. The boards need continuous support across their back to prevent bowing. Manufacturer guides disagree on furring strip spacing for vertical applications: UFP-Edge, Lowes, and The Home Depot require strips at 24 inches on center or less, while Great American Spaces recommends them every 16 inches on center. The Great American Spaces guide recommends furring strips every 16 inches on center. Attach the furring strips to the studs, then nail the shiplap to the strips. Your nail length need only be long enough to penetrate the shiplap and bite 1-1/4″ into the furring strip.

Exterior or High-Humidity Areas: This is a major point of disagreement. Woodtone and Arauco state their products are for interior use only. Full stop. However, Tilton Coffered Ceilings says their planks “may be used in DRY exterior environments where they are protected from direct contact with ANY wet weather (i.e. On a covered porch ceiling).”

Suitability for exterior use varies: Woodtone and Arauco state their products are for interior use only, while Tilton Coffered Ceilings says their planks may be used in dry, protected exterior environments. A plain steel or even painted trim nail will rust, staining the wood and losing strength. The Tilton guide also notes you can skip the acclimation period for these dry exterior uses.

The Role of Construction Adhesive

Should you glue as you nail? It’s not required, but it’s a smart backup. Construction adhesive helps bond the shiplap to the substrate (drywall, plaster, furring strips), reducing squeaks and providing additional resistance to warping or pulling away.

The Tilton Coffered Ceilings guide recommends, but does not require, a construction adhesive like Loctite PL 510 Wood & Panel. If you use it, apply a thin bead in a zig-zag pattern on the back of each board. Then immediately nail the board in place. The nails act as clamps while the adhesive cures, which can take 24 hours.

Where this goes sideways: Using adhesive alone without nails. Adhesive needs constant pressure to bond properly, and wood movement can break that bond. The nails provide the permanent mechanical lock. Adhesive is a partner, not a replacement.

Troubleshooting Common Nailing Problems

Even with the right nail, things can go wrong. Here’s how to fix them.

Splitting the Tongue: This happens when you nail too close to the end or edge of the tongue, or use too thick a nail for the wood density. The fix is to pre-drill. Use a drill bit slightly smaller than the nail’s diameter to drill a pilot hole through the tongue at your nail angle. It adds a step but saves a ruined board.

Nail Won’t Sink (Proud Nail): This usually means you missed the framing behind the wall. Don’t just hammer it in; you’ll dent the wood. Use a nail puller to remove it cleanly, find the stud with a finder, and try again. If you’re consistently missing, your stud layout might be off-standard. Take the time to map every stud before you start nailing.

Board Gaps or Uneven Reveals: This is often a nailing sequence issue, not a nail problem. If you nail one end of a board and then the other, you can inadvertently bow the board or pull it out of alignment. The pro method is to set the board, tap it tight, then place a single nail in the center of the board at a stud. Check for level or plumb, then work outwards, adding nails from the center to each end. This locks it in straight.

Nails for Painted vs. Primed or Textured Shiplap

The type of shiplap you’re using changes your nail choice. For primed boards that you plan to paint on-site, the standard recommendation is to use 15- or 16-gauge standard or painted trim nails. The goal is to use a fastener that can be easily concealed with a final coat of latex paint. These nails are the go-to for a clean, finished look where you don’t want the fasteners to stand out. When working with a pre-finished or textured shiplap, the same gauge of nail is often used, but you must be more strategic about placement. The nail needs to be driven into the tongue of the board at an angle so the next board’s groove covers it completely. This technique hides the fastener regardless of the board’s surface texture, maintaining the intended visual style.

Frequently Asked Questions

What type of nails are best for installing shiplap?

15-gauge or 16-gauge finish nails (trim nails) are the standard. They are thick enough to hold securely but leave a small hole that’s easy to fill. The exact length is determined by the need to achieve 1-1/4″ to 1-1/2″ of penetration into the wall stud or ceiling joist**.

What is the proper way to nail shiplap?

The proper technique is blind-nailing. Nail at a 45-degree angle down through the tongue (the protruding lip) of each shiplap board. When the next board is installed, its groove will slide over the tongue, completely hiding the nail head. Only the first and last boards in a run are face-nailed, and those fasteners are covered by trim.

Should I use a brad nailer or finish nailer for shiplap?

Use a finish nailer. A brad nailer typically fires thinner 18-gauge nails, which lack the holding power for shiplap over time. A finish nailer is designed for 15- or 16-gauge nails, which have the necessary strength. The tools are similar, but the nail capacity is different. For a reliable comparison of brad nailer vs finish nailer, the gauge is the deciding factor.

Do you nail shiplap through the tongue?

Yes, you always nail through the tongue except for the starting and ending boards. This is the “blind-nailing” method that makes the fasteners invisible. The nail is driven through the tongue at an angle into the wall stud. The groove of the board above then covers the nail head completely. It’s the fundamental skill for a clean shiplap installation.

The Bottom Line

Forget the marketing on the nail box. The only specs that matter are 15 or 16 gauge and a length that guarantees over an inch of bite into solid wood. Pair that with the blind-nailing technique, and the fasteners disappear, leaving only the clean lines of the wood.

If you take one thing from this, let it be the penetration rule. Measure your combined material thickness (shiplap + drywall), add 1-1/4 inches, and buy that length nail. It’s the difference between a wall that stays put for decades and one that whispers complaints every time the humidity changes. Everything else, adhesive, screw backups, pilot holes, is just fine-tuning a system that already works. Now go make some sawdust.