Standard privacy fences develop a fatal flaw about a year after installation: the boards dry out, shrink, and leave finger-width gaps that let neighbors peek right through. A board on board wood fence is engineered to defeat exactly that problem. Instead of butting pickets edge to edge, the boards overlap in an alternating pattern, so even after the wood shrinks and cups with the seasons, no straight line of sight ever opens up. The result is true, permanent privacy plus a richer, dimensional look from both sides of the fence. It costs more than a basic stockade, but for many homeowners the upgrade is worth every dollar.
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How Board on Board Construction Works
The design is simple but clever. Pickets are mounted on alternating sides of the horizontal rails, with each board overlapping its neighbors by an inch or more. From straight on, the fence looks solid. From an angle you see the layered depth, and light passing between the layers still finds no direct path through.
That overlap is the whole point. As lumber loses moisture and narrows over its first year, a butted fence opens gaps while a board-on-board fence simply reduces its overlap slightly, staying fully private. The same construction also gives the fence a finished, attractive face on both sides, which pleases neighbors and can matter for HOA approval.
Choosing the Right Wood
Wood selection drives both the price and how long the fence lasts. The three common choices each hit a different balance of cost and durability.
- Pressure-treated pine: the budget favorite at roughly $3 to $7 per linear foot in materials, rot-resistant but prone to warping if not sealed
- Western red cedar: naturally rot- and insect-resistant, dimensionally stable, and beautiful, at about $8 to $15 per foot
- Redwood: premium stability and looks, priciest of the three, best in western regions where it is locally available
Cedar is the sweet spot for most homeowners, resisting decay without chemical treatment and holding its shape better than pine. Whatever you choose, insist on quality posts; the posts fail long before the pickets do.
What It Costs to Build
Because a board-on-board fence uses roughly 30 to 50 percent more lumber than a standard fence, it costs more. Expect total installed prices of $25 to $45 per linear foot with professional labor, or $12 to $22 per foot if you do it yourself and buy the materials.
For a typical 150-foot backyard run, that puts a professional install somewhere between $3,700 and $6,700, while a determined DIYer might spend $1,800 to $3,300 in materials. The extra wood is the reason for the premium, but you are buying decades of gap-free privacy and a fence that looks good from the street. Set posts in concrete and the structure easily lasts 15 to 20 years with cedar.
Planning and Layout
Before buying a single board, handle the boring but critical prep. Call 811 to have underground utilities located, at least a few days ahead, because hitting a gas or fiber line while digging posts is expensive and dangerous. Confirm your property line with a survey rather than a guess; fences built over the line get torn down.
Check local codes and HOA rules for height limits, commonly 6 feet in back yards and 3 to 4 feet in front, and for setback requirements. Then plan post spacing at 6 to 8 feet on center. Mark the corners and run a string line so the fence follows a true, straight path. Good layout prevents the leaning, wavy fences that plague rushed jobs.
Setting Posts the Right Way
The posts are the backbone, and this is where a fence lives or dies. Dig holes at least one-third the post height deep, so about 24 to 30 inches for a 6-foot fence, and below your local frost line to stop winter heave. A 4×4 or, better, a 6×6 post in a wider hole resists leaning far longer.
Set each post in concrete, plumb it with a level in two directions, and brace it until the concrete cures, ideally overnight. Slope the top of the concrete away from the post so water sheds instead of pooling at the wood. Rushing the posts, or setting them shallow in dirt, is the number one cause of fences that lean within a couple of years.
Installing the Rails and Boards
With posts cured, attach horizontal rails between them, typically two rails for a 4-foot fence and three for a 6-foot fence to prevent picket sag and warping. Use galvanized or stainless fasteners; standard screws rust and streak the wood.
Now hang the pickets. Fasten the first course of boards to the front of the rails, spacing them a couple inches apart. Then mount the second course on the back, centering each board over the gaps in the first course with an inch or more of overlap on each side. Keep a small gap between each board and the ground so the wood does not wick moisture. A spacer block speeds this up and keeps the overlaps consistent down the whole run.
Board on Board vs Other Fence Styles
It helps to understand where this design sits against the alternatives before you commit the extra lumber cost. A standard side-by-side privacy or stockade fence butts pickets together in a single layer, which is cheaper but opens gaps as the wood shrinks. A shadowbox fence, sometimes confused with board on board, alternates boards on both sides but leaves deliberate gaps for airflow, so it looks good from both sides but is not fully private.
Board on board is the choice when total, permanent privacy is the priority and you want a fence that looks finished from both faces. It uses more wood than shadowbox or stockade, but it is the only common wood style that stays gap-free through years of seasonal movement. If you live in a windy area, note that a solid board-on-board fence catches more wind load than a gapped design, which makes robust posts set in concrete even more important. Weigh privacy against cost and wind exposure to decide if the upgrade fits your situation.
Gates and Special Details
The gate is the part of any fence that gets the most abuse and fails first, so it deserves extra attention on a board-on-board build. Because these fences are heavy, build the gate frame with a diagonal brace running from the bottom hinge corner up to the opposite top corner to prevent sagging. Use heavy-duty hinges rated for the gate’s weight, and set the gate posts deeper or use 6×6 posts for the extra load.
Plan the gate width around how you will actually use it; a 4-foot gate lets a wheelbarrow or mower through, while a narrow 3-foot gate suits foot traffic only. For a driveway or side yard, a double gate that swings open wide gives vehicle access. Leave a small gap under the gate so it clears uneven ground as it swings. Quality gate hardware, a self-closing hinge and a solid latch, costs a bit more but saves years of frustration with a dragging, sagging gate.
Finishing and Maintenance
Even rot-resistant cedar lasts longer and looks better with a finish. Wait a few weeks for new wood to dry, then apply a penetrating stain with UV protection or a clear water-repellent sealer. This guards against the graying, cracking, and cupping that sun and rain cause over time.
Plan to re-seal every two to three years, and walk the fence each spring to tighten loose fasteners and check the posts. A board on board wood fence rewards this modest upkeep with a lifetime of solid privacy, and because the overlapping design hides the seasonal movement of the wood, it always looks intentional and complete in a way a simple picket fence never quite manages.
