What Size Concrete Post For 6ft Fence With Gravel Board?
Choosing the right size concrete post for a 6ft fence with a gravel board is crucial for ensuring the fence's stability and longevity. The height of the post needed will depend on the total height of the fence, which includes both the fence panels and the gravel board. Generally, gravel boards are around 6 inches (150mm) high, making the combined height of the fence approximately 6ft 6in (2 metres). To support this structure adequately, you will typically need concrete posts that are at least 8ft (2.4 metres) in length.
This additional length is necessary because a significant portion of the post needs to be buried underground to provide adequate support. A good rule of thumb is to bury one-third of the post’s total length. For an 8ft post, this means approximately 2ft (600mm) should be set into concrete below ground level, leaving around 6ft (1.8 metres) above ground to support the fence panels and gravel board. Setting the posts to this depth helps to ensure that the fence can withstand wind loads and other pressures without leaning or falling over.
In terms of width, concrete posts are generally available in different thicknesses, but for most residential fencing applications, a post with a cross-section of 4 inches by 4 inches (100mm by 100mm) should suffice. This size provides a good balance between strength and cost-effectiveness. However, if the fence is expected to endure heavier loads or is located in a particularly windy area, you might consider using thicker posts for added stability and durability.
Finally, it's important to ensure that the posts are correctly installed using a strong mix of concrete. This involves digging a hole that is at least 2ft deep and wide enough to accommodate the post and a generous amount of concrete around it. Typically, the hole should be about three times the width of the post. This provides a solid foundation that will keep the post firmly in place, reducing the likelihood of movement over time. Proper installation not only enhances the structural integrity of the fence but also extends its lifespan, ensuring that your investment is protected for many years.