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Expanding Foam vs. Concrete Fence Post: Pros & Cons

Expanding Foam vs. Concrete Fence Post: Pros & Cons

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You need to repair or build a fence, but you’re unsure which material is best for the job. Both concrete and foam are great options for fencing, but there are some important differences between them that you should consider before making your final decision.

The main difference between expanding foam and concrete fence posts is the expansion. Expanding foam is capable of expanding widely to fill all the cavities. Concrete, on the other hand, weighs more than expanding foam hence provide a much stronger anchorage.

A fence foam post can act as an alternative to a concrete post. A concrete fence post is a common choice for people looking to build or repair their fence. However, both of these materials have their pros and cons.

Let’s take a look at both of these materials in detail so you can decide which one is right for your project.

What Is Expanding Foam?

Expanding foam is also called insulation or spray foam. Many people recognize it to fill cracks, gaps, and holes to keep out pests or improve insulation. However, there are many different types of foam on the market used for all sorts of jobs.

Expanding foams expand when they come into contact with air so that they can fill any gaps between surfaces. This makes them an excellent option for holes and gaps that you want to fill.

Expanding foam is can-based polyurethane or isocyanate thermal insulation. The spray foam offers myriad benefits compared to other insulation products. These benefits have increased its popularity for a wide range of applications, but there are some limitations that cause potential concerns for the installer. Here are the advantages and disadvantages of using this product:

Advantages of Using Expanding Foam

Stops Water Pipes from Rattling in the Wall

Expanding foam is great for sealing up small gaps in walls that are large enough to fit a drinking straw. It will not crack or crumble, so it’s easy to apply and can even be pitched towards the inside of the wall cavity with a putty knife. The expanding foam will expand outwards until it fills any cracks, crevices, or holes.

Helps in Saving Energy at Home

Expanding foam can also help insulate areas around the home to keep them cool in the summer and warm in the winter. The effective insulation for walls and home ceilings ensures a more comfortable environment in any room of your house.

It’s Eco-Friendly

Expanding foam doesn’t only reduce your home’s energy consumption but also uses soy-based ingredients. Soy-based foam insulation is perfect for any home undergoing the LEED certification process, as it has an overall lower environmental impact compared to traditional, petroleum-based foam.

Reduces Noise Pollution

One of the biggest benefits of expanding foam is that it can reduce unwanted noise by blocking sounds and stopping vibrations from moving through the walls.

Prevents Mold and Mildew Growth

One of the worst things that can happen to your home is mold or mildew grows on the walls. But by properly insulating them with expanding foam, this will never be an issue. The insulation blocks moisture from coming in contact with drywall, helping prevent growing mold spores before they have a chance to take root.

Adds Structure to a Building

Expanding foam is a great way to add extra support and stability to the inside of any wall in your home or building. It provides a sturdy foundation that’s perfect for hanging items like shelves, heavy pictures, large mirrors, and more. Plus, it doesn’t shrink over time.

Disadvantages of Expanding Foam

Highly Expensive

The cost of spray foam is extremely high in most areas of the world. In addition, professional installation costs a great deal due to the high demand for trained specialists in this area.

Cannot Be Spray-On

Spray foam insulation must be applied by professionals using large industrial spray equipment, limiting your ability to add it easily yourself or take care of larger jobs without help from experts.

It’s Not Thick Enough, Leading to Overuse

There are two types of spray foam insulation. They include open and closed cells. The closed-cell is not thick compared to the open-cell, which leads to the overuse of this expensive insulation.

The Foam Affects Other Materials

The spray foam insulation affects other materials, making it difficult for you to use these items during or after installation. This can be very frustrating if you need to do so.

Causes Moisture Damage

Sealing the spaces in your attic rafters can trap any moisture that leaks through the roof shingles, and this can cause the shingles and roof sheathing to rot.

Increases the Weight of Your Home

Spray foam can increase the weight of your home, which makes it difficult for your roof to hold the extra weight. This could lead to a major disaster if you are not careful.

What Is Concrete Fence Post

This is the traditional way of setting fence posts. For many years, a concrete fence post has been one of the most used materials in placing fence posts. It is versatile, sturdy, and quite affordable.

But is it still a good fencing option in 2021? Here are some of the pros and cons of using a concrete fence post.

Pros of Installing a Concrete Fence Post

Easy Maintenance

Due to its impermeable surface, you can easily maintain it. Stubborn issues such as mold, liquid, and rot cannot easily penetrate the concrete and will remain outside of the fence posts.

However, you have to keep the concrete posts looking clean by cleaning them thoroughly every month. It’s recommended to use a pressure washer to clean the fence post. You can also use strong cleaners that can clean any dirt or grease buildup.

Easy to Install

It’s easy to install a concrete fence post since you can use a standard shovel, a mix of stones, water, and cement to create a strong base so it won’t wobble or give in when big animals push against it. You have to place each component in its appropriate place.

Adds Aesthetic Looks to Fence

Concrete fence posts look strong and beautiful that can add a touch of elegance to the surrounding. They come in different shapes and sizes, so you can choose a design that matches your property’s style.


Concrete is a very durable material that means your fence will remain sturdy and strong for many years to come. Also, the changing weather conditions do not easily affect it, making it quite reliable for use in all seasons.

The Cons of Concrete Fence Posts


Installing a concrete fence post is quite a heavy task. Also, it is important to consult a contractor when installing any fence post in order to avoid unnecessary costs.

Concrete Integrity

Even though concrete is strong and durable in many ways, it is vulnerable to cracks and damages that can occur over a period of time.

It’s Unsustainable

If you value sustainability so much, then concrete posts aren’t for you. Concrete has a high carbon footprint and takes a very long time to “break down.”

Read More: Types of Fences

Final Thought

As you can see, both expanding foam and concrete fence posts are great for your fencing needs. However, it’s essential to keep the above-mentioned pros and cons in mind when choosing either of the materials. Also, remember that any form of construction and renovation requires patience and proper execution.

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