The Best Cement for Aluminum Fence Posts (and What to Avoid)
- Aluminum is one of the most durable fence materials
- Some cement options may damage aluminum
- Properly setting your fence posts is one of the most important steps in keeping your fence safe and secure
The Best Cement for Aluminum Fence Posts (and What to Avoid)
A beautiful fence adds curb appeal and security to your property, but knowing how to set your fence posts properly is just as important as choosing the right fence material. Aluminum is a popular, long-lasting choice, but not all cements are safe to use with it. Using the wrong mix can cause serious, fast-moving damage that compromises your entire installation.
What to Avoid: Lime and Acid-Based Cements
The most important rule when setting aluminum fence posts is to avoid any cement containing lime or acids. These formulations react chemically with aluminum and will rapidly deteriorate the posts - potentially eating through them entirely within just a few months. Without a protective sleeve over the aluminum, this breakdown can begin softening the metal within 24 to 48 hours of contact. This isn't gradual surface wear. It's a chemical reaction that can destroy a post before you'd ever expect a problem.
Quick-drying cements are a particular area of concern. If a quick-drying cement must be used, it is critical to avoid any formulation that contains lime or acids.
What to Use: Recommended Options
Most standard cements work safely with aluminum fencing. If you need a quick-setting option, use only mortar-based quick-drying cement. Two products we specifically recommend:
Important conditions to follow when using quick-set cement:
- If the ground temperature is below 40°F, warm the work surface and the surrounding area before applying
- If the ground temperature is above 80°F, use a slow-setting cement instead
- Only mix what you can use immediately. Quick-set cement will begin setting in the container, so don't mix more than you can place at once
Preparation: What You'll Need
Before you begin, gather everything you need, so you're not scrambling mid-project. Do not open your cement mix until you are ready to use it. Have these materials on hand:
- High-quality aluminum fence posts and paneling from a reputable supplier like Fencing Direct
- The correct number of cement bags for your project
- An auger or digging tool for clean, accurate post holes
- Gravel for drainage
- A level and string line for precise placement
- Water
Setting Your Posts for Success
Even the right cement won't perform well if the posts aren't set correctly. Keep these best practices in mind:
- Dig holes 6 inches wide and 24-36 inches deep
- Add 6 inches of gravel at the bottom of each hole to promote drainage
- Paneling must be installed before the concrete is wet
- Use the dry pour method. Pour the mix directly into the hole
- Please note, that you cannot use this method with quick-set concrete, as it starts pulling groundwater instantly.
- When ready, wet concrete
- Tamp the mixture carefully to eliminate air pockets
- Allow proper cure time. While quick-set cement becomes mostly dry in 20-40 minutes, it is not fully cured or able to support heavy gates for approximately 24 hours
Ensure a Lifetime of Stability With Fencing Direct
At Fencing Direct, we've seen firsthand what the wrong cement can do to an aluminum post - which is why we worked directly with our vendor to identify safe, reliable options. Getting the cement right from the start means your fence will have the foundation it needs to last for decades. Contact us today with questions about materials, installation, or to request a quote.
Image credit: // Shutterstock // Snide12
