Shiplap butt-joint stagger — landing joints on studs when the wall outruns the stock
When a wall outruns the stock, land every butt joint on a stud and stagger so no joint repeats within ~3 rows — never stack them into an “H.” Staggering holds waste at a 12% minimum.
What this diagram shows
Two elevations of the same 16-foot wall paneled in 8-foot shiplap boards, six rows each, with studs dashed at 16 inches on center. Every row needs a butt joint because the wall is longer than the stock. The correct panel staggers the joints — every joint lands on a stud, neighboring rows offset by at least two stud bays, and no joint repeats within three rows. The wrong panel stacks every joint on the same stud, the "H" pattern, highlighted in red: it reads as one vertical seam and opens as the boards move. Pieces per row equal wall length divided by stock length rounded up, and a staggered layout holds the waste factor at a 12 percent minimum.
Shiplap Calculator
Free shiplap calculator: exact board or pack count from the real exposed coverage width, not nominal size. Horizontal, vertical & ceiling runs.
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