1×6 shiplap is a popular choice for adding clean lines and subtle texture to interior walls, ceilings, and other surfaces. The name describes a nominal board size, not its exact finished dimensions, so knowing the actual width and overlap is essential when estimating coverage. Material, profile, room conditions, and installation method also affect the project. This guide explains what 1×6 shiplap measures, how to calculate quantities, what to consider when choosing boards, and how to install them more reliably.
What Does 1×6 Shiplap Mean?
The label “1×6” refers to a board’s nominal size: a standardized name that generally differs from the finished dimensions. A typical surfaced 1×6 board measures about 3/4 inch thick by 5 1/2 inches wide. Actual dimensions can vary by product, so the manufacturer’s specifications should be checked before calculating a layout.
Shiplap describes the edge profile, not the board’s wood species or exact dimensions. Each board has a rabbet, or step-shaped cut, along its long edges. When installed, the rabbeted edges overlap or interlock, creating the characteristic horizontal shadow line. Some products use a similar-looking nickel-gap profile, which leaves a deliberate, consistent space between boards instead of a traditional overlapping joint.
The face width is not the same as the amount of wall covered by each course. With traditional shiplap, the overlap hides part of the board. With nickel-gap products, the visible gap also affects the layout. A board’s effective coverage width—the exposed face after installation—is the useful measurement for estimating how many courses a wall needs.
Common 1×6 Shiplap Dimensions And Coverage
Many 1×6 shiplap products have an actual face width close to 5 1/2 inches, but the effective coverage is commonly smaller. A traditional profile might cover roughly 4 3/4 to 5 inches per course, depending on its rabbet. This is only a planning range; the product’s stated coverage takes priority.
For a quick estimate, divide the wall’s height by the product’s effective coverage width, then multiply by the wall’s length. Convert inches to feet before calculating, or use the formula below with consistent units:
Wall area in square feet = wall length in feet × wall height in feet.
Approximate linear feet of boards = wall area ÷ effective coverage width in feet.
If the product covers 4 3/4 inches per course, convert that figure to feet: 4.75 ÷ 12, or about 0.396 foot. A 10-by-8-foot wall has 80 square feet of area. Dividing 80 by 0.396 gives about 202 linear feet of board before waste. Add material for cuts, defects, and layout adjustments.
Another useful check is to calculate the number of courses. An 8-foot wall is 96 inches tall. At 4 3/4 inches of coverage per course, it takes about 21 courses, with the final course likely requiring a rip cut. The total length of those courses can then be estimated from the wall width.
For irregular rooms, measure each wall separately. Subtract large openings only when they meaningfully reduce the amount of material needed; cuts around windows and doors can create waste that offsets some of the apparent savings. For a simple estimate, a reserve of about 10% is often reasonable, with more needed for complex layouts, diagonal patterns, or imperfect walls.
Choosing A Material And Finish
1×6 shiplap is sold in different materials, and the best choice depends on the location, desired appearance, and maintenance plan.
- Pine: A common, widely available option for interior projects. It can be painted or stained, but knots and grain may show through paint unless the boards are properly primed and prepared.
- Other solid woods: Options such as cedar or poplar offer distinct grain, color, or workability. Availability and price vary by region and grade.
- Engineered wood or MDF: These products can provide a consistent surface and may arrive primed. MDF is generally intended for dry interior settings and must be protected from moisture unless the manufacturer specifies otherwise.
- Exterior-rated products: Exterior applications require materials and finishes designed for weather exposure, along with installation details that manage moisture. Interior shiplap should not be assumed suitable outdoors.
Boards may be unfinished, primed, prepainted, or prefinished. Factory finishes can reduce onsite painting, but cut ends may still need sealing or touch-up. For a painted installation, confirm whether the product is intended to be painted and follow its finishing instructions. For a stained finish, test a sample: species, grain, knots, and board-to-board variation can change the final color.
Board quality matters as much as species. Check for excessive bowing, twisting, damaged edges, and inconsistent profiles. A small variation in thickness or rabbet depth can make the shadow lines uneven. If the boards are delivered before installation, store them flat in the room or environment where they will be installed, following manufacturer guidance. Wood responds to changes in moisture, and acclimation can help reduce movement after installation.
Where 1×6 Shiplap Works Best
Horizontal 1×6 shiplap is often used on accent walls, entryways, bedrooms, living rooms, and ceilings. Its repeated lines can make a space feel wider, while vertical installation can draw the eye upward. The result depends on room proportions, board color, lighting, and trim. A sample board or mock-up can help show how the profile and shadow lines will look in the actual space.
Shiplap can be installed over studs or over a suitable, sound substrate, depending on the product and the project. For interior walls, installers commonly fasten boards into studs or blocking when required by the installation plan. A clean, flat base is important: uneven framing or a wavy wall can cause visible gaps and inconsistent courses.
Bathrooms, laundry rooms, and other damp areas need extra care. The finish, substrate, ventilation, and product instructions all matter. Shiplap is not a waterproof wall system, and joints should not be treated as a substitute for a properly designed wet-area assembly. It is generally unsuitable inside a shower unless the specific product and complete system are approved for that use.
How To Install 1×6 Shiplap
Plan The Layout
Measure wall length and height, locate studs, and check whether the wall is plumb and reasonably flat. Decide whether the boards will run horizontally or vertically, and plan how the first and last courses will finish. A narrow sliver at the ceiling or floor can look awkward, so a layout that splits the adjustment across the first and final boards may look more balanced.
Mark stud locations clearly and use a level or laser to establish the first course. The first board is especially important: if it is not level, the error can carry through every row. Where a manufacturer specifies a gap for expansion or a nickel-gap profile, use the recommended spacing rather than estimating by eye.
Prepare And Cut The Boards
Follow the product instructions for acclimation, priming, and finishing. Prepainting or staining boards before installation can make the work faster and help cover surfaces that would be difficult to reach later. Touch up cut edges as appropriate for the material and finish. Use a fine-tooth blade suited to the product, and wear appropriate eye and dust protection when cutting.
Plan joints over framing where the installation method requires it, and stagger end joints from one course to the next for a more natural appearance. Avoid lining up seams in a repeated vertical column unless the design calls for it. Inspect each board before fastening and set aside pieces with defects that would be prominent in the finished wall.
Fasten The Boards
Fastener type, length, and placement depend on the board thickness, substrate, and manufacturer’s instructions. Interior boards are commonly secured with nails or screws; some profiles allow fasteners to be concealed through a rabbet, while others call for face fastening. Use a stud finder and confirm that fasteners engage the intended framing or approved backing. Do not assume the board profile alone provides structural support.
Keep courses aligned and check level at regular intervals. Leave any required perimeter or expansion clearances, which trim may conceal. Around outlets, windows, doors, and corners, measure carefully and use appropriate boxes or extensions where needed. Electrical work should comply with applicable codes; a licensed electrician can advise on boxes, clearances, and wiring changes.
Estimating Project Costs
The cost of a 1×6 shiplap project depends on material, grade, finish, location, and whether installation is do-it-yourself or professional. Solid wood, prefinished boards, specialty profiles, and small orders can cost more than basic unfinished material. Labor, trim, fasteners, substrate repairs, paint, and delivery may add substantially to the total.
Because prices change by market and product, the most reliable estimate comes from local supplier quotes. Compare prices using the product’s effective coverage, not just the price per board or nominal width. A board with a narrower exposed face may require more linear footage to cover the same wall.
A practical materials budget should account for:
- Boards, including the planned waste allowance
- Fasteners and any required adhesive or backing
- Primer, paint, stain, or finish
- Corner, baseboard, and window or door trim
- Tools, delivery, and disposal of old materials
- Wall repairs or electrical adjustments
For professional installation, request an itemized quote that separates material and labor and states how openings, trim, surface preparation, and finishing are handled. This makes bids easier to compare and reduces the chance of unexpected additions.
Common Mistakes To Avoid
- Using nominal width to estimate coverage: A 1×6 is not necessarily six inches wide, and its exposed coverage is often narrower still.
- Skipping layout planning: A thin final course, poorly placed seams, or uneven first row can be noticeable across the finished wall.
- Installing damp or unsuitable material: Moisture changes can contribute to movement, and interior products may not be appropriate for damp or outdoor locations.
- Ignoring wall flatness: Shiplap follows the surface beneath it; a bowed wall can make the rows appear uneven.
- Forgetting finishing details: Cut ends, corners, outlets, and transitions need a plan for a clean, durable result.
Frequently Asked Questions
How Wide Is 1×6 Shiplap?
A typical 1×6 board is about 5 1/2 inches wide after surfacing, but the actual measurement varies by product. The exposed width after overlapping is usually smaller. Check the manufacturer’s listed coverage per board or course.
How Many Square Feet Does A 1×6 Shiplap Board Cover?
There is no universal figure because board length and profile differ. Multiply the board’s length by its effective coverage width, using feet for both measurements. For example, an 8-foot board with 4 3/4 inches of coverage covers about 3.2 square feet before accounting for cuts.
Can 1×6 Shiplap Be Installed Vertically?
Yes, if the product and fastening plan support that orientation. Vertical boards may need horizontal blocking or another suitable fastening base, depending on the wall construction and manufacturer’s instructions. Plan the backing before installation.
Does Shiplap Need A Gap Between Boards?
Traditional shiplap boards overlap at their rabbets. Nickel-gap boards are designed to show a consistent space. Follow the product instructions; adding or removing spacing can change the appearance and coverage and may affect how the boards move.
Reliable Planning Starts With Product Specifications
For a successful 1×6 shiplap project, the key figures are the board’s actual dimensions, effective coverage, and required fastening details. Product instructions are the best source for those specifications. General references on lumber sizing, such as the Wood Database’s lumber dimensions guide, explain why nominal and actual measurements differ. Before purchasing, confirm measurements and installation requirements with the manufacturer or local supplier, then use a measured layout to estimate material and finish.