Best Concrete Mix for Fence Posts for Ultimate Strength


Building fences at home is a smart and savvy way to save money, but it can be a daunting task when working with concrete. There are countless brands, mixes, and techniques that people use to secure fence posts, and knowing what to do is difficult. Using the best concrete mix for your fencing project will help you feel more comfortable with this large task.

The overall best concrete mix is the SIKA Postfix Fence Post Mix. It is made of a unique formula that is more resilient than leading competitors. Customers on Amazon rated it 4.5/5 stars for its strength, durability, and longevity, making it the best concrete mix for building fence posts.

Though SIKA Postfix Fence Post Mix is the highest-rated overall, there are other fence post mixes with similar ratings and qualities. Not all mixes work for every type of soil, fence, and time of year, but below are suggestions that will guarantee you find the mix you are looking for.

SIKA Postfix Fence Post Mix

SIKA Postfix Fence Post Mix was rated a 4.5 out of 5 stars on Amazon.com by 161 customers; this is the highest-rated concrete by the highest amount of people, making it the most reliable concrete mix in the business.

This concrete mix has an easy and simple application process and can set in as quickly as 3 minutes. It is high strength and is resistant to water uptake, meaning it will not rot your wooden fence posts, crack in the winter due to moisture freezing, or shift your fence over time. SIKA Postfix Fence Post Mix is also compatible with cold weather without the need for additives.

Another large advantage of using SIKA Postfix Fence Post Mix is the price- it costs $12.70 for a 2.5 pound (33 oz) bag. This bag is extremely cost-effective as the 2.5-pound mix replaces 50 pounds of concrete mix from other brands due to its unique formula.

SIKA explains this one of a kind concrete mix as “…A two-part, pre-proportioned polyurethane resin which when mixed produces an expanding foam. It has been specifically formulated and packaged to provide a lightweight, mix-in-the-bag, and fast-setting backfill for wooden, PVC, and steel in-ground supports. Sika PostFix is based upon Sika’s proven foam technology and designed for easy, convenient, and quick support of many types of posts.” Source

Other concrete mixes are heavy, messy, and can be easily messed up by adding too much or too little water, setting the concrete in the wrong weather, or not digging a deep enough hole. SIKA Postfix Fence Post Mix is specifically designed to combat all of these issues.

On YouTube, the account SIKA USA (The official YouTube account of the SIKA brand) posted a video more fully explaining the process of and science behind this boggling fence post mix. Watch below for a brand-certified explanation of SIKA Postfix Fence Post Mix:

The Best Classic Concrete Mix

As I explained in the section above, SIKA Postfix Fence Post Mix is the highest rated, easiest to use concrete mix, but it is a very unique and original material- in other words, it is not made out of classic concrete.

If that option does not suit your needs or your level of comfort with concrete, it is understandable that you would want to stick to a classic mix of water and concrete.

When talking about classic concrete mixes, Quickrete 10-pound Concrete Mix is the way to go! On Amazon, it was rated 4/5 stars by 225 customers, which is a great rating for that many reviews.

Just like SIKA Postfix Fence Post Mix, it is durable and easy to use. All you need to do is mix the concrete with the recommended amount of water, mix, pour, and wait for it to set.

A 10-pound bag only costs about $13.75 on Amazon, which is not a bad price. It does add up if you need many bags, but there are places online or in-store that may sell it cheaper.

Concrete Mix Comparisons

If you are unsatisfied with the two recommendations provided above, no worries! The world of concrete is a vast one and there are many other options for you when it comes to fencing.

Below are some of the top competitors to both the SIKA Postfix Fence Post Mix and the Quickrete 10-pound Concrete Mix.

Fast 2K Fence Post Mix

Fast 2K Fence Post Mix by the brand H.B. Fuller is a close competitor to SIKA Postfix Fence Post Mix.

Fast 2K Fence Post Mix is made out of a similarly unique expanding foam technology to the SIKA Postfix Fence Post Mix, requires no water, works with steel, wooden, or vinyl posts, does not absorb water, and a 4-pound bag replaces 80-100 pounds of classic concrete.

This mix is extremely similar to SIKA Postfix Fence Post Mix and only costs about $16.00 on Amazon. It has a rating of 4/5 stars from 84 customers, so it is not quite as reliable as SIKA Postfix Fence Post Mix, but it is a close second.

The biggest downside to this product as compared to SIKA Postfix Fence Post Mix is the amount of time it takes to set. SIKA Postfix Fence Post Mix takes about 3 minutes while Fast 2K Fence Post Mix takes 15 on average, so it is not as quick if that is what you are looking for.

Hartline Rockite Anchor Cement

The leading competitor for a classic concrete mix like Quickrete 10-pound Concrete Mix is Hartline Rockite Anchor Cement. It comes in a 10-pound bucket for $20.00 and is rated 4.4/5 on Amazon by 134 customers.

This concrete mix is strong, easy to use, and comes in a bucket so you are able to store the extra powder in the original container if you do not use it all in the first go.

This is just water and cement mix, just like Quickrete 10-pound Concrete Mix, and has instructions for use on the backside of the bucket it comes in.

Ensuring A Strong Post Base

No matter the concrete mix you end up using, it is imperative that you build a strong base for your fence post.

The Home Depot made a perfect video showing how (and how not) to place, set, and cement your fence posts. Watch the video below to confirm you are creating a base that will ensure the ultimate strength for your fence post.

“Installing Fence Posts” by The Home Depot Canada on YouTube.com

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