Cedar 4x4 posts typically last 10 to 20 years in the ground. Cedar contains natural oils and tannins that make it highly resistant to rot and insects, but its lifespan heavily depends on your soil type, climate, and how the post is installed.
An untreated cedar post typically lasts 15 to 20 years in the ground. Its actual lifespan depends heavily on the ratio of dense, rot-resistant heartwood to outer sapwood, as well as your local soil drainage and climate.
To stop cedar posts from rotting in the ground, you need to block the three things wood-decaying microbes need to survive: moisture, oxygen, and suitable temperatures. You can achieve this by using physical barrier sleeves, adding gravel for drainage, and treating the wood with chemical preservatives.
A properly installed and "ground contact" rated pressure-treated 4x4 post typically lasts 10 to 20 years in the ground. However, this lifespan varies significantly depending on your climate, soil conditions, and installation methods.
The "7-year fence law" is a common term for adverse possession or boundary by acquiescence laws. It does not automatically give a neighbor your land. However, if a neighbor openly encloses and uses a strip of your property with a fence for seven continuous years, they might legally claim it.
Setting cedar fence posts in concrete is a common practice, but it presents a major trade-off: it provides excellent structural stability but can trap moisture and accelerate wood rot. Experts generally advise either using gravel and carefully sealing the post base, or omitting concrete entirely and backfilling with gravel and tamped dirt.
To prevent a 4x4 post from rotting, block the combination of moisture, oxygen, and fungi that cause decay. The most effective method is using an in-ground barrier sleeve (like Postsaver or RotGuard) applied to the groundline area, combined with gravel for drainage at the base of the hole.
The cheapest time to buy lumber is during the late fall and winter months (November through February). Because construction slows down significantly during this period, lumberyards and big-box retailers typically clear out excess stock, dropping prices by 20% to 30%.
Never burn pressure-treated wood, as the released chemicals and smoke are highly toxic. Additionally, never use it indoors, allow it to contact food (e.g., cutting boards, picnic tables, or edible garden edging), or use the sawdust for mulch.
An untreated wood post set in concrete may last only 5-10 years, while treated posts with proper drainage and protection can last 25 years or more.
T-posts are generally stronger and offer better rigidity for heavy-duty fencing, high winds, and larger animals. U-posts, however, are better suited for temporary, lightweight applications like garden netting or poultry fencing.
Motor oil repels water and deters insects, effectively slowing down rot in outdoor wood, such as fence posts or barns. However, it is an unregulated, environmentally hazardous practice. It never fully dries, leaches into the soil, emits a strong odor, and poses toxicity risks.
Treat Posts With a Wood Preservative
Wood preservatives are chemicals you can apply to posts before setting them in the ground: Wood preservatives add additional protection from insects, fungi and decay.
Yes, a 4x4 post will rot in concrete if left unprotected, but the concrete itself isn't the primary enemy. Rotting is caused by water, trapped moisture, and wood-destroying fungi that thrive when timber sits in a constantly damp environment.
Pressure-treated (PT) wood generally lasts longer than cedar when used as posts in direct contact with the ground. PT posts typically last 20–30 years, while cedar posts usually last 15–20. However, cedar outperforms PT wood in dimensional stability, resisting warping and twisting over time.
The short answer is yes, lumber prices today can move up or down depending on the product, the season, and the supply chain. Heading into 2026, many buyers should plan for continued price changes, especially for high-demand materials like framing lumber, plywood, and pressure-treated boards.
When buying lumber, avoid wood with high moisture content, visible defects (cracks, splits, exposed bark, or insect holes), and center-grain (the pith). Always sight down boards to reject warped pieces—such as bows, cups, crooks, and twists—and purchase from reputable suppliers rather than unverified third-party marketplaces.
In 1972, a standard 8-foot 2x4 cost approximately $0.75 to $1.00 at retail hardware stores. At the wholesale mill level, framing lumber prices averaged about $113 for 1,000 board feet in January 1972, making a single 8-foot 2x4 worth around $0.30 to $0.45 before retail markups.
Yes, in-ground post protectors (like Post Protector or Postsaver) are highly effective. They eliminate direct soil-to-post contact, blocking the fungi, moisture, and insects that cause rot, and can significantly increase a post's lifespan by over 250%.
The best way to put a 4x4 post in the ground for maximum longevity is to bury 13 to 12 of its length, ensure the wood is pressure-treated for ground contact, pour 4 to 6 inches of gravel at the bottom for drainage, and secure it using quick-setting concrete sloped away from the post.
Fences that annoy neighbors typically violate height limits, cross property lines, block scenic views, or use unmaintained, hazardous, or glaringly unsightly materials.
Pouring concrete directly around a wood post is a common, but highly debated, practice. While it provides excellent structural stability, concrete can trap moisture against the wood and accelerate rotting if not done correctly. The best approach depends on whether the post is used for a fence or a weight-bearing structure.
Coca-Cola acts as a powerful surface retarder on freshly poured concrete because of its high sugar content. By slowing down the curing process on the top layer, it allows workers to easily wash away the cement paste with a hose or pressure washer, leaving behind a textured, decorative "exposed aggregate" finish.
Water is the ultimate enemy of concrete. Because concrete is naturally porous, it acts like a hard sponge. When moisture gets inside, it causes a chain reaction of damage, especially when combined with temperature drops or corrosive chemicals.