Why Fence Posts and Pickets Rot

Fences are a valuable addition to any property, providing privacy, security, and aesthetic appeal. But over time, even the sturdiest fences can succumb to the elements, with one of the most common problems being rot.

What Causes Rot?

Rot is the breakdown of wood by fungi, which thrive in moist environments. Several factors can contribute to rot in fence posts and pickets:

• Moisture: Wood that is constantly wet or damp is more susceptible to rot. This can be caused by rain, snow, or even poor drainage around the fence.

• Contact with the Ground: The ground is a naturally moist environment, so any part of the fence that is in direct contact with the soil is at risk of rot.

• Insect Damage: Some insects, such as termites and carpenter ants, can weaken wood and make it more susceptible to rot.

The Consequences of Rot

Rot can have serious consequences for your fence. It can:

• Weaken the structure: Rotted wood is less strong and more likely to break. This can lead to the fence leaning, sagging, or even collapsing.

• Decrease lifespan: Rot can significantly shorten the lifespan of your fence, requiring you to replace it sooner than necessary.

• Compromise security: A weakened fence is less effective at keeping intruders out and pets in.

• Reduce aesthetics: Rotted wood looks unsightly and can detract from the curb appeal of your property.

How to Prevent Rot

Fortunately, there are several things you can do to prevent rot in your fence:

• Choose rot-resistant wood: Some types of wood, such as cedar, pressure-treated lumber, and metal posts are naturally resistant to rot. Or, use a non-toxic barrier wrap that is applied at the base of each post to protect it from premature ground-line rot.

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• Install the fence properly: Make sure the fence posts are set deep enough in the ground to provide good support, but not so deep that they are in constant contact with moisture. The groundwater in Oregon soil is expected to freeze at 18”, so ensure that all posts are buried at or below this depth. 

• Use gravel or pavers: Laying gravel or pavers around the base of the fence can help to improve drainage and prevent moisture from accumulating around the posts.

• Maintain your fence: Regularly inspect your fence for signs of rot and make repairs as needed. This may include replacing damaged pickets or applying a fresh coat of an oil based stain when the weather allows.