Omar Khalid
When it comes to installing a plastic fence, there are several factors to consider, including cost, durability, and the level of security required. While cementing fence posts in the ground is a common method for installing fences, it may not be the best option for all situations. In this article, we will explore the advantages and disadvantages of cementing a plastic fence and offer alternative methods for installation. We will also discuss the factors that can influence your decision, such as geographical location and environmental conditions, to help you make an informed choice.
| Characteristics | Values |
|---|---|
| Plastic fence durability | Least durable compared to wood or metal |
| Plastic fence cost | Cheapest compared to wood or metal |
| Cementing fence posts | More secure and strong but expensive and permanent |
| No cementing fence posts | Less secure but cheaper and easier to remove |
| Cementing in cold weather climates | Concrete is sloped upwards to prevent permafrost from pushing the post upwards |
| Preventing rot | Use gravel to keep posts dry, avoid concrete which holds moisture |
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What You'll Learn
Pros and cons of cementing a plastic fence
Cementing a plastic fence has its advantages and disadvantages. One of the main benefits of using cement for any fence installation, including plastic, is that it provides strength and security. It is also a common method, with many opting for cement due to its perceived effectiveness.
However, cementing a plastic fence may not be the best option. Plastic fence posts are the least durable type of fence post, and while cement can add some durability, it is not the most effective material for plastic fences.
One of the main issues with using cement for any type of fence is the risk of rot. Cement holds moisture, and if this moisture is not wicked away from the post, it can cause the post to rot quickly. This is especially true for wooden fence posts, which are more susceptible to rot than metal or plastic posts. To prevent rot, proper drainage must be implemented, and the concrete must be allowed to wick moisture away from the post.
Another factor to consider is the geographical location and environmental conditions. For example, upward sloping concrete is commonly used in cold weather climates to prevent permafrost from pushing the post upwards. However, this practice may not be necessary in warmer climates and could be considered a marketing ploy to increase costs.
Additionally, installing fence posts with cement can be a messy, labour-intensive, and expensive project. It is also a permanent option, making it more challenging to remove or replace the fence in the future.
In summary, while cementing a plastic fence can provide added strength and security, it may not be the most suitable option due to the risk of rot, the labour and costs involved, and the permanence of the installation. Alternative methods, such as using gravel or sand, can provide similar stability while offering better drainage and easier removal or replacement.
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Alternative materials to cement
Cement is a common choice for installing fence posts due to its strength and durability. However, there are several alternative materials and methods available that can be more suitable in certain situations.
One alternative is post anchors, which are metal brackets or sleeves driven into the ground to support fence posts. These anchors are typically made from galvanised steel, providing stability and preventing the posts from shifting. They are available in various sizes and designs to accommodate different fencing types.
Ground screws, also known as ground anchors or screw piles, are another option. These long metal screws with helical blades are twisted into the ground, creating a stable foundation for fence posts. They work well in various soil types and offer quick and efficient installation without the need for digging or concrete.
Driven posts, tensioning systems, and DuraPost are additional alternatives to cement. DuraPost is a galvanised steel post system that is maintenance-free, long-lasting, and compatible with most fencing types.
For filling fence post holes, expanding foam is an option. It is made from expanding polyurethane foam, filling the post hole upon application. Expanding foam is lightweight, eco-friendly, and cures quickly. However, it is more expensive and less durable than concrete.
Each alternative material or method has its benefits and considerations, so it's important to assess your specific needs and project conditions before deciding on the most suitable installation approach for your plastic fence.
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Environmental factors to consider
The decision to cement in your plastic fence or not depends on several environmental factors. Firstly, the geographical location and the environmental conditions of the area you live in play a crucial role. For instance, upward sloping of concrete is a technique used in cold weather climates with sustained hard freezes to prevent permafrost from pushing the post upwards. Conversely, in places with high rainfall, rain can cause corrosion to any fence, especially metal fences, leading to a loss of shine and eventual breakdown. Similarly, moisture in the air can cause wood to rot, warp, and crack, a process called delignification, which weakens wooden fences. Therefore, it is essential to consider the specific environmental conditions of your region and choose a fencing material that can withstand those conditions.
Another factor to consider is the impact of extreme weather events. High winds can cause fences to sway and even blow over, resulting in damage or collapse. Snow and ice can also pose challenges, as the weight of snow can break wooden fences, and ice can crack both wood and metal. Therefore, it is essential to choose a fencing material that can withstand high winds, snow loads, and freezing temperatures. Additionally, regular maintenance and inspections are crucial to ensuring the fence's integrity during severe weather conditions.
The type of soil in your area is another environmental factor to consider. If you have soil with good percolation, allowing water to settle away quickly, using sand and dirt to secure your fence post may be sufficient. However, if your soil does not percolate well, such as clay soil, concrete might be a better option to prevent water buildup, which can accelerate rot. Additionally, the depth of the fence post installation should be considered, as deeper installations may provide more stability in certain soil types.
Lastly, the environmental impact of the fencing materials themselves is an important consideration. Vinyl fencing is popular due to its durability, low maintenance, and attractive appearance, but it may not be the most environmentally friendly option. Wood fences, for example, require the consumption of mature trees and can end up in landfills if not sustainably sourced or recycled. Aluminum and steel fencing, on the other hand, are recyclable and contribute to a circular economy, reducing the need for new resources. Additionally, wood alternatives made from recycled materials can offer more eco-friendly options while also being low maintenance and recyclable.
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Preventing fence posts from rotting
Plastic fence posts are the least durable type of fence post, but they are much cheaper than wood or metal. Fence posts are typically installed in the ground using cement or other adhesives. While cement is a strong and secure option, it is also messy, labour-intensive, and expensive.
If you are looking to prevent fence posts from rotting, there are several methods you can use:
- One way to prevent rotting is to wrap the end of the post in plastic before placing it in the hole. This helps to keep water out and prevent rot.
- Another method is to use a Postsaver® sleeve, which blocks rot by creating a waterproof and airtight barrier around the fence post. It is easy to apply and an effective way to protect your fence post from the elements.
- You can also try using gravel or sand to fill the hole around the fence post. This helps to support the post and allows for drainage, preventing water buildup and accelerating rot.
- If you choose to use concrete, proper drainage can mitigate the risk of rotting.
- For wooden fence posts, pressure-treated posts are recommended to prevent rot.
- Finally, you can install fence posts without cement, which is a cheaper alternative. However, this method is not as strong or secure and may not be suitable for all types of fence posts.
By following these methods, you can effectively prevent fence posts from rotting and ensure the longevity of your fence.
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Installation methods
The installation method for a plastic fence depends on various factors, including geographical location, environmental conditions, and leverage ratios versus external force. Here are some common installation methods for plastic fences:
Using concrete
One common method for installing fence posts is to use concrete. This involves digging a hole that is approximately three times the width of the post and one-third to one-half the height of the post above ground. For example, a 4-inch wood post should have a hole that is about 12 inches wide and 2 feet deep for a 6-foot-tall fence. After digging the hole, you can add about 6 inches of gravel, compact it, and then set the post into the hole. You can use a level to ensure the post is perfectly vertical. Finally, fill the remaining space in the hole with concrete. This method provides a strong and secure foundation for your fence but can be more expensive and labour-intensive.
Without using concrete
If you prefer not to use concrete, you can install a plastic fence by following these steps:
- Dig a hole that is slightly wider and deeper than the fence post. The depth of the hole should be approximately one-third to one-half of the post's height above ground.
- Fill the hole with gravel or sand to provide support for the fence post.
- Insert the fence post into the hole and fill the remaining space with dirt.
This method is cheaper and allows for easier removal of the fence post in the future. However, it may not be as strong or secure as using concrete.
Additional tips
To enhance the durability of your plastic fence, you can consider the following tips:
- Wrap the end of the post in plastic or use heat-shrink plastic sleeves to prevent water from entering and causing rot.
- Use a mix of crushed gravel and soil to backfill the hole, compacting the soil every 4 to 6 inches.
- Create proper drainage by sloping the concrete away from the post and providing gravel at the bottom.
- Use products like PostSavers to protect against fungal decay and extend the lifespan of the fence post.
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Frequently asked questions
Plastic fence posts are the least durable type of fence post, but they are much cheaper than wood or metal. Cementing your plastic fence posts will make them more durable, but it is a messy, labor-intensive, and expensive project.
You can install a plastic fence without cement. This method is not as strong or secure, but it is much cheaper and allows for easier removal.
First, dig a hole that is slightly wider and deeper than the fence post. Then, fill the hole with gravel or sand. Finally, insert the fence post into the hole and fill the remaining space with dirt.
You can wrap the bottom of the plastic fence post with a Grace ice and water barrier, or rubber flashing. You can also use gravel and sand to fill the hole around the post, tamping it down every 6 inches.
Cementing your plastic fence will make it more secure and durable. It is also a good option if you live in an area with clay soil, as water will run into the holes of gravel or sand and accelerate rot.
