Board On Board Fence Calculator
Calculate materials for a board-on-board (shadowbox) privacy fence.
Formula
Net coverage per board = width − overlap; Boards = 2 × fence length / net coverage
- Board-on-board uses two alternating rows of boards with overlap.
- Posts typically 4×4; rails 2×4 at top and bottom.
100 ft fence, 6 in boards, 1 in overlap
Inputs
- Fence Length: 100 ft
- Board Width: 6 in
- Overlap: 1 in
- Post Spacing: 8 ft
Net coverage = 5 in = 0.417 ft. Boards = 2×100/0.417 ≈ 480 boards.
Frequently asked questions
Why board-on-board?
Board-on-board allows wind to pass through slightly (reducing fence damage) while maintaining privacy.