How to Fix a Fence: Replacing Boards, Pickets, and Sections (2026)

Frequently Asked Questions

How do I replace a fence picket or board?

A fence board is held by nails or screws into the horizontal rails (stringers) behind it. Remove the fasteners — use a cat's paw pry bar for nails, a drill/driver for screws. Pull the old board off. Measure the old board's width and length. Cut the replacement to the same dimensions. Use the old board as a template. Install with two fasteners per rail location: drive 3-inch hot-dipped galvanized or stainless nails (or 2.5-inch exterior deck screws) through the board face into the rail. Pre-drill near the ends to prevent splitting. Set the board height consistent with adjacent boards — use a scrap piece as a spacer at the base to maintain the gap off the ground.

How do I know if the rails (stringers) are still good before replacing boards?

Press firmly on the rails with your thumb at several points. A solid rail feels hard with no give. A rail that feels soft, crumbles, or shows dark staining to the interior is rotted. Check especially at the points where rails connect to fence posts — end grain in contact with a post holds moisture and rots first. A rotted rail needs replacement before new boards go on it (new boards nailed to a soft rail won't hold). To replace a rail: remove all boards from that section, remove the old rail (usually face-nailed to the posts), cut the new rail to length, attach with structural screws through the posts.

The fence posts are solid but the boards are all rotted. Should I rebuild or just replace boards?

If the posts and rails are solid (passes the screwdriver probe test): replace only the boards. New boards nailed to existing solid structure last as long as a full rebuild, at a fraction of the cost. If the rails are also soft: replace boards and rails while the posts are accessible. The decision point is the posts — replacing fence posts is the most labor-intensive part of fence work (requires digging). If 3 or more consecutive posts are bad: a section rebuild is more cost-effective than individual post replacement. Use pressure-treated ground-contact rated posts (UC4B for in-ground contact) and set at least 1/3 of the post length below grade, below the frost line.

Can I replace just one section of a panel fence?

Yes. Pre-built fence panels (typically 8 feet wide) are sold at home improvement stores — they're made with pre-attached pickets on top and bottom rails. To replace a section: remove the fasteners attaching the existing panel to the posts, slide the old panel out, slide the new panel in, and re-fasten. However: pre-built panels use thinner lumber than a fence built in-place, and the panel style must match the existing fence. If you can't find a matching panel style: build the replacement section in-place using the same dimensions as the original.

How do I prevent fence boards from rotting?

The primary rot causes: ground contact (moisture wicks up end grain), standing water on horizontal surfaces, and paint that has cracked or peeled allowing moisture into the wood. Prevention: (1) Keep boards off the ground — maintain at least 2 inches clearance between board bottoms and soil. (2) Apply a wood preservative or penetrating exterior oil finish to all cut ends before installation. (3) Seal the top rail and post caps — water sits on horizontal surfaces. (4) Apply a fence stain or sealer every 3–4 years to reduce moisture absorption. (5) Trim vegetation away from the fence — plants hold moisture against the wood.

Replacing a broken fence board: pry out the nails or unscrew the old board from the two horizontal rails behind it. Cut a new board to the same length.

Address individual boards before rot spreads to the rails and posts.

What you need

• Replacement fence boards (pressure-treated pine, cedar, or matching species)
• Hot-dipped galvanized nails or exterior deck screws
• Cat’s paw pry bar (for removing nailed boards)
• Drill and bits
• Tape measure and circular saw
• Wood end-cut sealer or penetrating wood preservative

---

Step 1: Assess the damage

Walk the fence and identify which boards need replacement. Probe each board and the rails behind it with a screwdriver. Mark boards for replacement with chalk. If the rails fail the probe test: add rail replacement to the task list.

---

Step 2: Remove damaged boards

Pull nails using a cat’s paw pry bar (set it behind the nail head and pry). Or use a drill/driver to back out screws. Remove the board from the fence.

---

Step 3: Inspect and repair rails if needed

With the board removed: test the rails. If soft: pry off the rail and replace with a new pressure-treated board of the same dimensions. Fasten with 3-inch structural screws through the post.

---

Step 4: Cut and install new boards

Use the old board as a template for the new board length. Cut with a circular saw. Apply wood end-cut sealer or preservative to both cut ends — let dry.

Position the new board with a consistent gap off the ground (use a block of wood as a spacer at the base). Drive two fasteners per rail location. Pre-drill near board ends.

---

Step 5: Apply finish

Apply fence stain or exterior wood sealer to the new boards. If the existing fence has a stain coat: blend the new boards by applying a matching product. New pressure-treated lumber should weather 6 months before staining.

---

Related guides

• How to Fix a Broken Fence Post — post repair and replacement when the posts are failing
• Fence Repair Cost — what to expect to pay when hiring out fence repairs
• How to Build a Fence — full fence construction when replacement is the right answer
• How to Waterproof a Deck — wood sealing for related outdoor structures