Alexei Volkov
Post caps are an essential addition to your fencing as they protect the tops of your fence posts from weather damage, preventing mildew, mould, and cracking. They also serve as a decorative finish and can be purchased in a wide range of sizes, shapes, and colours. There are several ways to install plastic post caps, including using an exterior-grade construction adhesive, epoxy, caulking, or vinyl fence cement. If you want to avoid adhesive, you can use screws to attach the post caps. To ensure a long-lasting, no-hassle attachment, use anti-rust screws.
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What You'll Learn
Measuring the post
To install plastic post caps, you must first ensure that the caps will fit your posts. Use a tape measure to double-check the size of your fence posts before installing the caps. The post caps should fit snugly on the posts without being too loose. Fence post caps protect the posts from weather damage, so using them can prevent issues that arise when fence posts are left exposed.
Wooden posts that are left outside in the rain will rot, as all the moisture will condense at the tops of the posts. This encourages the growth of mildew and mould, eventually causing the posts to rot. The sun and wind can also dry up the wood on top of your fence posts, leading to cracking. Therefore, it is important to install a post cap that fits well.
If you are installing solar post caps, you will need to ensure that the caps can be removed to replace the batteries when needed. These caps should be mounted with removable screws. If your solar post caps have top access, you can mount them with adhesive.
You can use exterior-grade construction adhesive to adhere the cap to the post. Apply the adhesive liberally to the inside of the cap, and then place the cap firmly over the top of the post. You can also use vinyl fence cement or silicone caulk to secure the caps.
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Using adhesive
Adhesive is a reliable method for installing plastic post caps, especially in areas with high winds or extreme weather conditions. Before you start, ensure that the post cap you've chosen is the correct size for your post.
To install a plastic post cap using adhesive, first, apply a small bead of exterior-grade construction adhesive inside the cap's edges. Use an external construction adhesive to glue the inside edge of the moulding at the base of the fixture to the post. Position the cap on top of the post, ensuring proper alignment. Gently press the cap firmly in place and allow it to set.
Follow the adhesive manufacturer’s instructions regarding curing time before exposing the cap to weather conditions. Some adhesives may need to be left for 24 to 48 hours to set.
If you are installing vinyl post caps, you may want to use a vinyl adhesive or fence cement. Some sources suggest using PVC glue, while others have found that silicone does not adhere well to vinyl.
If your plastic post cap has a bottom opening, you may need to use screws to secure it in place.
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Using screws
Installing plastic post caps with screws is a straightforward process, but it requires careful alignment and secure fastening to ensure the caps remain firmly attached. Here is a detailed guide on how to install plastic post caps using screws:
Preparation
Before starting the installation, it is essential to gather the necessary materials and tools. You will need plastic post caps, screws, a drill, and, optionally, a tape measure and a pencil. It is recommended to use anti-rust or corrosion-resistant screws to ensure long-lasting attachment and prevent unsightly rust stains. If the plastic post caps did not come with screws, you can purchase them separately. Additionally, some caps may have pre-drilled holes, so check if you need to drill pilot holes to prevent splitting.
Alignment
The first step is to align the plastic post cap with the post. Place the cap onto the post, ensuring it fits snugly. If the cap feels loose, you may consider using construction adhesive or glue in combination with screws for extra reinforcement. Once the cap is properly aligned, you can proceed to secure it with screws.
Securing with Screws
Use a drill to insert screws through the pre-drilled holes in the cap supports or the pilot holes you drilled earlier. The number of screws required may vary depending on the size of the post cap, typically ranging from two to four screws. Ensure the screws are fastened securely, creating a firm connection between the cap and the post. Check that the cap does not wobble after installation.
Additional Tips
If you are installing solar post caps, remember to remove the plastic tab in the battery compartment to allow for terminal connection. Additionally, solar caps require access for future battery replacement, so ensure you can reach the battery compartment by removing the cap or accessing it from the top, depending on the design. For optimal performance, place the solar post cap in direct sunlight for the recommended duration with the switch in the OFF position before turning it on.
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Charging the solar light
To install plastic post caps, you'll first need to ensure that the post caps you've chosen fit your fence posts without being too loose. You can use vinyl fence cement or an exterior-grade construction adhesive to adhere the cap to the post. If you're using adhesive, apply it liberally to the inside of the cap and then place the cap firmly over the top of the post.
If your plastic post caps have lights, you'll need to charge them before installation. First, remove the metal top or lift the cap from the post to access the battery compartment. Remove the plastic tab in the battery compartment to allow for terminal connection. To charge the battery completely, turn the power switch to the OFF position. Your solar post cap light will need to be exposed to sunshine for at least 24 hours, and preferably 48 hours. Once the solar post cap has finished charging, flip the switch to the "ON" position.
If your plastic post cap has pre-drilled holes, attach the cap to the post using the included anti-rust screws. If your post cap does not have pre-drilled holes, you can use vinyl fence cement or an exterior-grade construction adhesive to adhere the cap to the post.
If you're using vinyl fence cement, you can try fastening a piece of line to the inside centre of each cap with PVC cement and attaching a weight to the end of the line. Then, lower the weight into the fence post and put the cap back on. Alternatively, you can use silicone caulk, which is strong and waterproof when cured.
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Applying a finish
If you are installing plastic post caps on a wooden post, it is recommended that you coat the wood with a high-quality exterior finish to preserve the wood's natural beauty and ensure its longevity. Apply the finish to all wood areas, including the underside of the cap, before installation. This will protect the wood from the sun's ultraviolet rays, moisture, and pollution, which can cause discolouration and deterioration.
For metal post caps, such as those made of copper, stainless steel, or brass, a thin, clear coating is often applied to protect the metal before and during installation. This coating will eventually break down due to environmental factors, so it is only a temporary solution. You can also apply a thin layer of lacquer or polyurethane to minimise discolouration during handling and installation.
To install the plastic post caps, you can use an exterior-grade construction adhesive or glue. Apply the adhesive liberally to the inside of the cap, then place it firmly over the top of the post. Alternatively, you can use screws to secure the caps. Make sure to use anti-rust screws or stainless steel screws to prevent rust stains.
For vinyl post caps, you can use vinyl fence cement or clear silicone caulk as an adhesive. Silicone caulk is preferred by some as it is strong, removable, and waterproof. You can also try using PVC adhesive, but it may not be as effective as the other options.
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Frequently asked questions
To install plastic post caps, first, ensure the caps fit your posts without being too loose. You can use an exterior-grade construction adhesive to adhere the cap to the post. Apply the adhesive liberally to the inside of the cap and place it over the post. Alternatively, you can use screws to attach the cap to the post.
You should use an exterior-grade construction adhesive. Some examples include vinyl fence cement, clear silicone caulk, and vinyl adhesive.
Yes, screws are a common method for installing plastic post caps. Use anti-rust screws to ensure a long-lasting attachment.
To charge the battery, turn the power switch to the OFF position. Expose the solar post cap to sunshine for at least 24 hours, preferably 48 hours. Once fully charged, turn the switch to the ON position.
