How the XS Precast Concrete Countertop Mix Outshines the Competitors

A Closer Look at Portland-Limestone Cement
and the Questions It Raises

In the race toward reducing carbon emissions and building a more sustainable future, the construction industry has placed significant emphasis on material innovation. One of the most talked-about shifts in recent years is the rise of 1L concrete, also known as Type 1L Portland-limestone cement (PLC). While its environmental intentions are clear, the execution and field performance of this material have sparked deep concerns among contractors, finishers, and construction professionals across the country.

What Is 1L Concrete?

1L concrete is a blended cement product made by intergrinding Portland cement clinker with up to 15% finely ground limestone. It falls under ASTM C595 and was promoted as a more sustainable option than traditional Type I or Type II cement, with a claimed reduction in embodied carbon of about 10%.
This transition is part of a broader movement toward lowering the construction industry’s carbon footprint. However, for many professionals working in the field every day, the reality of 1L’s performance has not aligned with its promise.

Why the Push—And Why the Pushback?

Advocates of 1L cement cite decades of successful use in Europe and a growing need for climate-conscious practices. Major producers in the U.S. began shifting almost entirely to Type 1L in 2022 and 2023, often with little consultation or consideration for the practical realities faced by contractors and specialty finishers.
This sudden change, often framed as a “drop-in replacement,” has led to a number of serious challenges:
Surface Defects & Finish Failures
Many contractors have reported inconsistent finish quality, scaling, dusting, and difficulty achieving color uniformity in decorative and exposed applications. In some cases, these issues have led to litigation over failed installations.

Lack of Field Testing & Support

Although some densifiers and admixtures are being promoted as compatible with 1L, most have not undergone sufficient independent testing to ensure reliable long-term performance. Contractors are left to troubleshoot on their own, often at their own expense.

Distrust from the Field

For many in the construction world, especially those working on architectural concrete, decorative finishes, or high-performance surfaces, the lack of transparency and technical support has created a deep sense of frustration and mistrust.

What Industry Experts Are Saying

While many material producers remain committed to 1L cement, an increasing number of contractors, specifiers, and consultants are raising red flags. Some are now avoiding 1L altogether in high-exposure projects or are specifying additional treatments, sealers, or surface hardeners to compensate for performance issues.
Yet even these remedies come with asterisks: most haven’t been thoroughly tested alongside 1L, and results vary based on climate, substrate, and finishing practices. While some contractors are beginning to find combinations that work, there is no universally endorsed solution at this time.

Proceeding with Caution

There’s no question that sustainability is an urgent priority—but true sustainability must also account for durability, performance, and constructability. When cement fails in the field, the environmental impact of replacement materials and labor far outweighs any initial carbon savings.
As the industry continues to explore lower-carbon alternatives, many experts are calling for a more thoughtful, transparent, and inclusive approach—one that includes rigorous testing, real-world data, and support for the contractors on the front lines of implementation.

The Bottom Line

1L concrete may represent a step toward sustainability, but for now, it’s a step that should be taken with full awareness of its limitations. The current landscape demands caution, continued evaluation, and an honest dialogue between producers and practitioners.
Until field data improves and manufacturers take stronger accountability for performance, the use of 1L cement should be considered on a case-by-case basis, especially in projects where finish quality, color uniformity, or long-term durability are critical.

Picking the right precast concrete countertop mix is important. The right mix is easy to work with and allows you to achieve the desired results. When you’re looking at mixes, you will find that XS Precast Countertop Mix stands out against the competition. It has countless benefits that you won’t get with other mixes.

Less Labor Intensive

When compared to other mixes, XS Precast Concrete Countertop Mix produces lighter slabs that are easier to handle. The slabs are hundreds of pounds lighter, so you don’t need a room full of people to lift a 700-pound slab. The slabs are lighter because the mix contains a glass fiber reinforced concrete (GFRC) hybrid. GFRC is much lighter than traditional concrete is.

You Can Leave Your Strong Casting Tables in the Warehouse

Hauling strong casting tables from one jobsite to the next is hard work. You need strong people to haul the equipment back and forth, and it takes up a lot of time. You can avoid this problem by using the XS Precast Concrete Countertop Mix. You can get away with a smaller table when you use the mix. It just needs to be flat and strong enough to hold the slab.

It Can Take a Beating

Unlike other precast concrete mixes, this mix can take a beating. It doesn’t crack easily, and it can bend. If you don’t want to worry about cracks ruining your countertops, this mix is a must.

You Can Make Large Slabs

If you’re working with traditional concrete, you will likely have to break the countertop up into 8-foot slabs. Each slab will weigh around 300 pounds. If you use this GFRC hybrid, you can make longer pieces so you won’t have to deal with as many seams.

XS Precast Concrete Countertop Mix can make your job much easier. The lighter material is more durable and requires fewer workers. This makes it the clear winner.

 

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