Dealing with
Fiber-Reinforced Concrete Slabs
Dealing with
Fiber-Reinforced
Concrete Slabs
Working with concrete floors can bring unexpected surprises — and one of them is discovering that your slab is fiber-reinforced. While these fibers are meant to strengthen the concrete, they can present a challenge when applying a coating system. Here’s how to handle them effectively to ensure a smooth, professional finish.
Why Fiber Removal Matters
Fibers can remain embedded in the surface after mechanical preparation, creating a rough texture and interfering with adhesion and coating uniformity. If left untreated, these fibers can protrude through your coating system, leading to visual defects and uneven finishes.
The Traditional Approach — and Its Risks
Many installers have long relied on propane torches to burn off exposed fibers. While this can work, it also comes with significant downsides:
- Fire hazard
- Risk of burns or injuries
- Difficulty moving with propane tanks
- Insurance restrictions for indoor torch use
- Inconsistent results, with potential for missed spots
Given these risks, it’s time to move toward a safer and more consistent method.
A Safer and
More Effective Method
After completing your surface preparation, apply a first coat of epoxy at a rate of 6–10 mils (160–265 sq. ft./gal) using the squeegee and backroll method.
Let the coating fully harden.
Once cured, sand the floor with a sander equipped with an 80–100 grit screen mesh to level the surface and remove the exposed fibers. Then, vacuum and wipe the entire floor before moving on to your standard installation steps.
Save Time with Fast-Curing Products
To optimize your workflow, use a fast-drying primer such as:
A versatile 100% solids epoxy primer designed for superior adhesion and easy application on properly prepared concrete surfaces.
Dry Through 6 hours at 22°C (72°F)
A rapid-curing epoxy primer ideal for projects requiring quick turnaround. It provides strong adhesion and excellent mechanical resistance while significantly reducing waiting times. Dry Through 4 hours at 22°C (72°F)
A moisture vapor barrier epoxy primer specially formulated for high-moisture substrates (when concrete moisture exceeds 4% on the Tramex meter). It ensures excellent adhesion even under challenging conditions. Dry Through 8 hours at 22°C (72°F)
A versatile 100% solids epoxy primer designed for superior adhesion and easy application on properly prepared concrete surfaces. Dry Through 6 hours at 22°C (72°F)
A rapid-curing epoxy primer ideal for projects requiring quick turnaround. It provides strong adhesion and excellent mechanical resistance while significantly reducing waiting times. Dry Through 4 hours at 22°C (72°F)
A moisture vapor barrier epoxy primer specially formulated for high-moisture substrates (when concrete moisture exceeds 4% on the Tramex meter). It ensures excellent adhesion even under challenging conditions. Dry Through 8 hours at 22°C (72°F)
Final Thoughts
By adopting this safer and more efficient approach, you’ll eliminate the risks associated with torching and achieve smoother, more consistent results — every time.
