Put in back rails about eight inches from the top and bottom of the fence to stop it from warping. If your fence will be higher than 8 feet then you may want to put another rail in the middle. Once you finish building, apply a sealant to the wood. It will slow the drying process so that everything happens more evenly.
Wood swells and shrinks due to the relationship between the relative humidity in the air and the wood's moisture content. Wood with high moisture content shrinks when it dries until it reaches a balance with the air's relative humidity.
Use a Glue Mixture to Keep Your Boards Straight
A fantastic way of keeping the boards straight is by then switching your water for a mixture of both water and glue, once the initial water has been soaked in. It's suggested that the only glue you should be using is Elmer's white glue or wood glue mixed in with water.
Because of the warping issue and our freeze-thaw climate, horizontal fencing doesn't generally last long. In fact, this type of fence wears down 4 times as fast as a vertical fence made with the same materials. This means that you'll have to replace it every 3-5 years instead of every 15-20 years.
Fixing a Warped Fence
The most common at-home repair requires you to expose your fence to water for it to reach its moisture content level before incorporating glue for durability. After the application stage, you must apply even pressure on the wooden plank as it fully dries, which can take a little over a week.
There are several ways you can attempt to remedy warped wood: The Heat Method: While heat (applied to wet conditions) can cause wood to warp, it can also be the solution to the problem. You can apply a heat source such as a heat lamp to a clamped piece of warped wood until the bend is remedied.
If your post is rocking around inside of its concrete footing, a good solution is a steel wedge. These can be driven between the post and concrete footing to straighten a leaning or wobbly post.
Disadvantages. However, horizontal fences do have a couple of downsides. They can be more expensive than vertical fences because they require more lumber. Additionally, horizontal fences are more likely to sag over time due to the weight of the pickets pulling down on the posts.
Fences have to face the power of wind, downpour, and numerous different things since they're exposed to the elements 24/7. So it's no surprise that after some time, they begin to sag or become deformed. It happens to all fences to some extent, but by far, the most susceptible are wooden fences.
When it absorbs water, it swells; when it expels water, it shrinks. This is normal. But when moist or damp lumber dries unevenly, the differentials in shrinkage put stress on the entire piece, and it warps. Imperfections like knots can exacerbate this process, too.
Durability
Horizontal fences are prone to sagging if not reinforced with posts or cross beams. But they're usually made from higher-grade lumber than traditional vertical fences. That said, vertical fences already include reinforcements that make them very durable.
Adding a coat of stain to your fence or deck doesn't just make it look more beautiful. It protects the wood from things like UV rays, molds, and mildews. Stain also adds moisture and protection to your boards so your boards don't dry out and warp when we hit those hot, dry days of summer.
HEAT & COLD
In addition, some fences expand in hot temperatures, which can lead to damage if the fence isn't flexible enough to allow for some expansion and contraction. It can also cause the fence to warp, which can pull the boards off of their fasteners.
Does your fence look like it is wavy? This could be from heavy wind exposure, or it may be the result of shifting fence posts. The posts are the vertical supports that hold the rest of the fencing in place. If these were not properly installed or they've moved around, the fence may start to sag in different directions.
The space needed between your boards depends if your boards are kiln-dried or green. For kiln-dried wood, leave about 1/16th of an inch, and for green wood go snug, but not overly tight.
Hardwoods like Ipe and Mangaris are gorgeous when applied horizontally because the natural grain that runs the length of the planks creates a high-end look. Softwoods like pine, Douglas fir, redwood, and cedar are also great fencing choices.
Best Wood For Horizontal Fences
Because horizontal fence boards can sag over the long term, it helps to purchase high-quality hardwood fence boards. Ipe, tigerwood, and cumaru are a few of the hardwoods from Brazil or Indonesia that are often used for horizontal fences.
A horizontal fence has the end of each fence board running side to side. The high-quality, durable lumber necessary to keep a horizontal fence from sagging also helps the fence last longer. The stringers at the top and bottom of the panels provide additional support as well.
Another option is to cut the post where the bend is and big-dowel on a new piece. You can also screw a chunk of pressure-treated or cedar onto the post's top and re-screw the fence panels onto that, to then slice off the warp from the yard side.
Expanded foam has nowhere near the density or rigidity. It is plenty strong enough to hold the post up under normal circumstances, but has little structural strength. Hammering a spike into it would do more harm than good, and makers warn against using expanded foam in load-bearing situations.
Timber has a natural tolerance in terms of how much it can expand and contract before succumbing to warping or shrinkage. The amount of shrinkage in wood will vary from species to species, but essentially, wood warping occurs when the moisture content of different parts of a piece of wood changes unevenly.
Common ways wood warps arise from the wood's storage conditions. These causes can include uneven finishing, changes in humidity, exposure to ultraviolet (UV) rays and high temperatures mixed with thinly cut wood. To prevent wood warping, ensure your stored wood is: In a well-ventilated area.