Article — Board and Batten Siding Calculator
Board and Batten Siding Calculator: Material Estimator
A board and batten siding calculator multiplies wall width by height, divides by board width, and adds a 10% waste factor. A 30 × 8 ft wall with 8-inch boards needs 45 boards and 46 battens, or about 728 linear feet of lumber before waste.
Board and batten has been around since Scandinavian farmers nailed vertical planks to their barns 400 years ago. The modern farmhouse aesthetic brought it back to American suburbs starting in the late 2010s. This calculator works for full house exteriors, accent walls inside a living room, or weekend shed projects.
What is board and batten siding?
Board and batten siding is a vertical-plank pattern: wide boards (typically 8 to 12 inches) installed edge-to-edge run from top to bottom of a wall, with narrow battens (1.5 to 3 inches) nailed over each seam. The battens cover the gap and provide a watertight overlap. The pattern works both as exterior cladding and as an interior accent wall.
The geometry is simple. Every board carries a batten over its right edge (or both edges, depending on style). The battens land at intervals equal to the board width. The visual effect is a strong vertical rhythm that emphasizes wall height.
The "modern farmhouse" style that popularized board and batten in the 2010s wasn't actually traditional American farmhouse construction. Real 19th-century farmhouses used lap siding (horizontal) almost exclusively. The vertical board-and-batten look came from barns and outbuildings — which is why the modern style is sometimes called "barn house."
Board and batten calculator inputs
Five inputs drive the material estimate.
- Wall width: Total horizontal distance to be covered, measured at the eave.
- Wall height: Vertical distance from grade (or starter strip) to the eave or soffit.
- Board width: Actual width, not nominal. A "1×10" is actually 9.25 in wide.
- Batten width: 1.5 in for traditional, 2.5-3 in for bolder modern patterns.
- Openings: Total area of windows and doors, in square feet. Subtracted from gross wall.
- Waste factor: 10% for clean walls, 15-20% for complex geometry.
The board and batten pattern math
The number of boards equals wall width divided by board width, rounded up. The number of battens equals boards plus one (one over each seam plus a corner batten at each end). Linear feet equals the count times the wall height. Board feet equals linear feet times nominal width in inches times thickness in inches, divided by 12.
boards = ceil(W / w_board) vertical planksbattens = boards + 1 seam covers + cornerLF = (boards + battens) · H linear feetBF = LF · w_in · t_in / 12 board feetA 30-foot wide single-story wall (8 ft tall) with 8-inch boards: 45 boards × 8 ft = 360 LF. 46 battens × 8 ft = 368 LF. Total 728 LF. At 10% waste: 801 LF. Convert to board feet for the lumber yard order — assuming 1-inch nominal thickness boards, 728 × 8 × 1 / 12 = 485 BF of boards plus 184 BF of battens.
Board and batten wood types
Wood choice drives cost, lifespan, and maintenance.
Cedar costs four times pine but lasts twice as long and looks better doing it. Cypress sits between the two at $3-5/BF. Engineered alternatives like HardiePlank (cement fiber) come pre-primed, paint well, and last 50+ years — at a price closer to cedar but with no warping or rot risk. The choice usually comes down to budget and desired aesthetic.
Board and batten installation
Six steps to install board-and-batten siding correctly:
- Install house wrap and flashing per IRC chapter 7.
- Add horizontal blocking or 1×4 furring at the top and bottom for nail backing.
- Start boards at one corner, plumb the first board with a level, and nail at top, middle, and bottom.
- Butt subsequent boards tight to the previous edge with no gap.
- Install battens centered over each seam, nailing only into the underlying board (not through both boards) to allow wood movement.
- Caulk top and bottom edges, paint or stain within 30 days of installation.
Nail each batten through the seam centerline so the boards beneath can expand and contract independently. Nailing the batten through both boards locks them together and forces the wood to crack along the grain when humidity changes — a common failure mode in poorly installed B&B.
Board and batten vs. shiplap
The two most popular vertical and horizontal siding styles look different and weather differently.
- Board and batten: Vertical orientation, raised batten over each seam, more dimensional shadow lines.
- Shiplap: Horizontal orientation, rabbeted overlap built into each board, flatter visual profile.
- Water shedding: Both work equally well; vertical channels in B&B and horizontal lap in shiplap both direct water down.
- Wind resistance: Slight edge to shiplap in extreme winds because the overlap captures uplift force.
- Installation difficulty: B&B is faster (no rabbet cuts), shiplap requires specialized boards.
- Modern look: Both fit; B&B reads more rustic-farmhouse, shiplap more cottage-coastal.
Common board and batten mistakes
Five mistakes show up on inspection reports and call-back lists:
The batten must allow the boards beneath to move with humidity. Nailing through both boards locks them and forces cracks when wood expands or shrinks. Always center the nail on the seam so it bites the batten and the underlying gap, not the boards on either side.
- Nailing through both boards: Restricts wood movement and causes splits.
- No air gap behind siding: Traps moisture and rots the boards from the back.
- Skipping kerfs at the bottom: Without a drip kerf, water wicks up the end grain.
- Battens too narrow: Battens less than 1.5 inches don't reliably cover seam plus 1/2-inch overlap.
- Wrong fastener: Galvanized nails stain cedar — use stainless or hot-dipped galvanized only.
- Painting too soon: Wait 30 days for boards to acclimate before painting; otherwise the paint cracks as wood shrinks.
Board and batten cost
Per square foot, board and batten runs $4-12 installed in 2026, depending on wood choice. Material is half to two-thirds of the cost; labor and installation makes up the rest. Comparable LP SmartSide engineered wood runs about $3-5 per square foot installed. Vinyl B&B-look panels: $2-3 per square foot, though they don't quite read as authentic up close.
For a typical 1,500 square-foot single-story house exterior (after subtracting openings), expect $6,000-18,000 total cost depending on material and crew labor rates. DIY installers save 40-50% on labor but should budget 2-3 weekends for a full exterior versus 3-4 days for a professional crew.