Installing Different Types of Wood Fence: Pro Best Practices

The Foundation: Post-Setting Protocols for All Wood Species

The primary point of failure in any wood fence is not the picket or the rail; it is the post base. When installing different types of wood fence, structural longevity hinges entirely on how the posts interact with the soil and concrete. A standard 4x4 post is sufficient for runs up to 6 feet high, but any gate post or fence exceeding 7 feet requires a 6x6 post to resist lateral wind loads and gate sag.

Posts must be set below the local frost line to prevent frost heave, which can push posts upward and rack the entire fence line. In northern climates, this often means digging 36 to 48 inches deep. The hole should be bell-shaped at the bottom, not cylindrical, to create a concrete anchor that resists upward extraction.

The concrete collar must be sloped away from the post at a minimum 5-degree angle to shed surface water. Using a high-density polyethylene (HDPE) post sleeve or wrapping the below-grade portion of the wood in a bituminous mastic membrane adds a secondary moisture barrier, extending the life of pressure-treated pine and cedar posts by up to 40%.

Species-Specific Installation Matrix

Material selection dictates your fastener strategy and ground-clearance requirements. The USDA Forest Products Laboratory Wood Handbook outlines how varying densities and extractive chemicals in wood react to environmental stressors and metal fasteners.

Handling & Fastening: Species Nuances

When installing different types of wood fence, treating all lumber identically guarantees premature failure. Each species possesses unique chemical and physical properties that demand specific installation techniques.

Western Red Cedar & Coastal Redwood

Cedar and redwood are prized for their natural decay-resistant extractives (thujaplicins). However, these same water-soluble tannins will aggressively corrode standard zinc-plated or electro-galvanized fasteners, resulting in unsightly black streaks down the face of the pickets. You must use Type 304 stainless steel fasteners for standard runs, and Type 316 stainless steel for coastal environments within 5 miles of saltwater.

According to the Western Red Cedar Lumber Association, cedar should never be installed in direct ground contact unless it is specifically graded and treated for such use. Maintain a strict 2-inch clearance between the bottom of cedar pickets and the soil or mulch line to prevent capillary moisture wicking.

Pressure-Treated Southern Yellow Pine

Modern pressure-treated pine utilizes micronized copper azole (MCA) or alkaline copper quaternary (ACQ) preservatives. These copper-based chemicals are highly corrosive to aluminum and standard steel. The American Wood Protection Association (AWPA) mandates that fasteners used with ACQ/MCA treated wood must meet a minimum G185 hot-dipped galvanized coating standard, or be polymer-coated structural screws.

Tropical Hardwoods (Ipe, Cumaru, Garapa)

Tropical hardwoods offer extreme density and Class A fire ratings, but their Janka hardness makes installation labor-intensive. You cannot face-nail Ipe without pre-drilling every single hole with a carbide-tipped bit, and countersinking requires specialized stop-collars to prevent burning the dense fibers. For fences, utilizing a hidden fastener system (like stainless steel Ipe clips screwed into the rail) is vastly superior, allowing for thermal expansion while hiding the hardware.

Crucially, all cut ends of tropical hardwoods must be immediately sealed with a commercial end-grain sealer (such as Anchorseal). Failure to seal the end grain of Ipe will result in severe checking (splitting) at the rail intersections within the first 60 days of UV exposure.

Picket Spacing and Wood Movement

Wood is hygroscopic; it expands across the grain when it absorbs ambient humidity and shrinks when it dries. Proper spacing prevents buckling in high humidity and excessive gapping in dry winters.

• Kiln-Dried (KD) Cedar/Redwood: Install with a 1/8-inch gap (the thickness of a standard framing nail) between pickets. This allows room for seasonal expansion during wet spring months without causing the boards to cup or push each other off the rails.
• Green/Wet Pressure-Treated Pine: Install tight, edge-to-edge. Shrinkage will create the necessary gaps.
• Board-on-Board (Shadowbox) Style: Overlap boards by 1 to 1.5 inches. This accounts for shrinkage while maintaining privacy. If using 1x6 pickets, a 1-inch overlap ensures that even if the wood shrinks 10%, no sightlines will open up.

Troubleshooting Common Installation Failures

Even experienced crews make systemic errors when rushing through fence installations. Recognizing these failure modes before they happen is the hallmark of professional craftsmanship.

Mastering the installation of different types of wood fence requires respecting the material science behind the lumber. By matching the correct fastener metallurgy to the wood's chemical preservatives, engineering the concrete foundation to defeat frost heave, and anticipating dimensional shrinkage, you ensure a fence system that remains structurally sound and visually pristine for decades.