Placing a thick layer of loose gravel at the bottom of the post hole will allow groundwater to trickle through the rocks and down away from the base of the post. This will prevent the post from rotting by keeping it constantly dry. You can purchase gravel at a local hardware store or landscaping-supply business.
Soak the bottom of the posts in a wood preservative containing copper napthanate, such as Cuprinol. Note: Available at some paint stores and home centers, this wood treatment is specifically designed for in-ground applications.
Surround the submerged wood with cement. Adding cement to the structure adds stability and seals the wood from any submerged dangers such as insects or water. This allows the exposed wood to be treated as often as necessary without concerns for the submerged aspects. Dig the hole to the desired depth for stability.
A treated 4×4 will last 20 to 25 years in the ground if the conditions in the soil and climate are favorable. That number could increase to 40 to 75 years if you install the treated 4×4 in a cement ring rather than the soil. There are a few factors that influence how long the 4×4 can last in the ground.
Pour waterproofing wood sealant into a bucket and immerse the end of the wood fence post that will be buried below ground into the sealant. Allow the post to remain in the sealant overnight. According to We Build Fences, untreated wood posts buried below ground have shorter lifespans because of rot.
To keep the wood from rotting, apply a wood preservative to seal it. “It’s like wax on a car,” Holt says. “It helps protect it from the elements, from water, from sprinklers.” Water-repellent preservatives and sealants are sold at home-improvement and hardware stores.
You should use a wood preservative that contains copper naphthenate and it should meet the AWPA (American Wood Protection Association) Standard for preserving wood for ground contact. What is this? I personally had excellent results with Tenino Copper Naphthenate wood preservative. You can find it here on Amazon.
If you use one of these preservatives, aim for maximum penetration. Soak the wood rather than brushing it whenever possible. This will provide the maximum protection. Still, don’t expect wood you treat yourself to last as long as pressure-treated lumber.
Pressure-treated wood in contact with the ground needs the most protection, and will rot in just a few years if you use the wrong grade. If you’re planning a DIY project, make sure to tell your lumber dealer the end use, so you’ll get the right grade.
5 Answers. A PT post will last a long time in concrete, maybe 5 to 10 years in soil alone.
It depends on the climate, the type of wood, its uses, and how well it’s maintained. While pressure treated poles can stay up to 40 years without any signs of rot or decay, decks and flooring might only last around 10 years.
While treated timber posts can last from anywhere between 10-15 years, untreated timber may need replacing in under 5 years. What’s more, rotting, splitting and warping (where the post expands upon water absorption) are all very common occurrences for wooden fence post systems.
The Post Collar protects from damage caused by machinery. The fungus-resistant treated Butyl adhesive creates a seal around the post protecting the post from the elements that cause rot. Fasteners (nails or screws) self seal much like roofing repair, not damaging the lumbers resigns or pressure treatment.
Simply setting the posts in concrete does create a condition that will accelerate rot in the bottom of the posts. With pressure-treated posts, the rot will be slow. … Concrete should be poured around the post – no concrete under the post.
The trick is to use medium-size drainage gravel instead of pea gravel. The individual rocks in drainage gravel wedge against one another to mimic concrete. Backfilling with soil is usually only appropriate for a post-and-rail fence that isn’t heavy and doesn’t create a windbreak.
DO Employ a Base Gravel Layer
If a fence post fails without any sign of a pest infestation, it’s likely that the failure was caused by moisture that rotted the wood over time. … Once you have added gravel to a depth of three inches or so, use a piece of scrap lumber to tamp down the layer.
Apply roofing tar to the lumber, but only to wood that will actually be below dirt. Using a brush, brush tar onto the lumber. One coat will suffice.
Roofing tar is a traditional way of protecting fence posts. The tar adheres to the fence posts so that nothing can penetrate, prolonging the life of the wood by keeping insects and rot away.
Maintaining your wooden deck is the best way to keep it looking it’s best for as long as possible. Cleaning your deck and applying a fresh coat of sealant once every year will help keep the wood from weathering and cracking.
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