How do you space board and batten?

How do I space board and batten on a wall?

Decide how many battens you want, subtract their total width from the wall width and divide what is left by the number of gaps. A 12 ft (144 inch) wall with 3½ inch battens and a target of about 12 inches takes 10 battens with 9 equal gaps of 12⅛ inches, a batten at each end.

How many battens do I need?

Subtract one batten width from the wall width, divide by the gap plus one batten width, round to a whole number and add one. For the 144 inch wall: (144 − 3.5) ÷ (12 + 3.5) = 9.06, so 9 gaps and 10 battens.

How much lumber does a board and batten wall take?

The vertical battens run from the floor, or the baseboard, up to the top rail. With an 8 ft wall and one 3½ inch top rail, each vertical is 92½ inches: 10 of them plus a 12 ft rail is 1,069 inches, or 89.1 linear feet — twelve 8 ft boards, since the rail is longer than one board.

How does exterior board and batten siding work?

Wide boards go up vertically with a small gap, and a narrow batten covers each joint. A 20 ft wall of 11¼ inch boards (1×12s) with ½ inch gaps takes 21 boards and 20 battens.

What size boards are used for battens?

1×3 and 1×4 boards are the usual battens; they are actually 2½ and 3½ inches wide. Use the actual width in the calculator, not the nominal one, or the spacing will be off.

How does the gap I choose change the batten count?

On a 120-inch wall with 2.5-inch battens, a target gap of 8 inches gives 12 battens, 10 inches gives 10 and 12 inches gives 9. The calculator then adjusts the real gap slightly so that the spacing is equal and a batten sits at each end of the wall.

Does the calculator subtract windows and doors?

No. It treats the wall as a continuous surface. For a wall with openings, lay out the battens for the full wall width and skip any that fall inside an opening, or count each section between openings separately.

How the calculation works

For an interior accent wall, the calculator chooses the number of vertical battens so the gaps are as close as possible to the gap you want. With wall width W, batten width b and target gap g, the count is the nearest whole number to (W − b) ÷ (g + b), plus one. The gaps are then made equal: (W − count × b) ÷ (count − 1), so a batten sits at each end of the wall. The vertical battens run from the floor, or the baseboard, up to the horizontal rail at the top, which is why each is shorter than the wall height by the rail width. For exterior siding, the wide boards are the wall width divided by the board width plus gap, rounded up, with a batten over each joint between boards.

Worked example

An accent wall is 120 inches (10 ft) wide and 96 inches (8 ft) high, with 2.5-inch battens (actual width of a 1×3) and a top rail of the same width. For a target gap of 10 inches: (120 − 2.5) ÷ (10 + 2.5) = 9.4, which rounds to 9, so you need 10 battens. The real gap is (120 − 10 × 2.5) ÷ 9 = 10.56 inches. Each vertical is 96 − 2.5 = 93.5 inches long. The total, including the rail, is 87.92 linear feet of lumber.

For siding, a 20 ft wall (240 inches) of 11¼-inch boards with ½-inch gaps needs ⌈240 ÷ 11.75⌉ = 21 boards and 20 battens.

Common mistakes

• Using nominal widths. A 1×3 is actually 2½ inches wide and a 1×4 is 3½ inches. The spacing is built on the real width.
• Marking the layout from one end. Measuring a fixed gap from one side of the wall leaves an odd gap at the other. Use equal gaps from end to end.
• Forgetting the rail. If the battens stop at a top rail, subtract the rail width from the height when cutting the verticals.

Sources and related calculators

Method: equal-spacing layout arithmetic. Lumber sizes: actual dimensions of dressed lumber as listed in the American Softwood Lumber Standard (NIST Voluntary Product Standard PS 20). Related: wainscoting calculator, baseboard calculator and lumber calculator.