Floor coating plays a vital role in maintaining the structural integrity and operational efficiency of any industrial facility. In the food industry, flooring is more than just a surface to walk on. It is a critical factor in ensuring hygiene safety and meeting HACCP standards. However, the sight of peeling or blistering floor coatings after only a short period of use is a recurring nightmare for many facility owners.
Index
Where does the root cause lie? Let’s join Rohde in analyzing the 5 most common reasons and their ultimate solutions.
5 causes of floor coating failure in food factories
Concrete moisture
Floor coating failure is most frequently traced back to internal concrete moisture, a factor responsible for nearly 70% of all delamination cases. In the demanding environment of food processing – where floors are subjected to constant washing and steam cleaning. The interaction between water and the concrete substrate is complex and high-risk.
When a concrete slab is not properly treated with a sub-slab vapor barrier or is coated before reaching its equilibrium moisture content (ideally <4-5% by mass or <75% relative humidity), liquid water becomes trapped. As the facility’s ambient temperature rises, this moisture undergoes a phase change into water vapor.
In a sealed environment, this vapor creates hydrostatic pressure or osmotic pressure. This physical force exerts upward stress that exceeds the adhesive bond strength of the coating. The result is the formation of “blisters”—bubbles filled with fluid or air that eventually pop, leading to localized or widespread peeling.
Thermal shock
Unlike standard warehouses, food factories often feature specialized zones:
- Cold storage/freezers: Sub-zero temperatures.
- Cooking areas/Hot water cleaning: Rapid and extreme temperature shifts.
When using standard Epoxy coatings, the inconsistent expansion and contraction between the paint and the concrete lead to widespread cracking and peeling. For these areas, polyurethane concrete (PU) floor coating systems are the optimal choice due to their exceptional thermal shock resistance.
Impact of chemicals and organic acids
During processing, floors coating are regularly exposed to animal blood, fats, sugars, milk, or harsh disinfectants. These organic acids can penetrate and corrode non-specialized coatings, destroying adhesion and making the surface brittle. This leads to easy peeling under mechanical stress from forklifts or trolleys.
Inadequate surface preparation
A common mistake is simply cleaning the floor with water or manual sweeping. To ensure a permanent bond, the concrete surface must be:
- Mechanical grinding: Using specialized floor grinders to open the concrete pores.
- Industrial vacuuming: Ensuring no fine dust remains to interfere with the primer’s adhesion. Without this step, the coating is merely “sitting” on top of the floor rather than “locking” into the concrete.
Selecting the wrong coating system for specific zones
Each area within a factory (dry zones, wet zones, packaging, or processing lines) has distinct technical requirements. Applying a “one-size-fits-all” coating formula to save costs often results in rapid failure in the most demanding environments.
The solution
To eliminate peeling issues once and for all, Rohde proposes a rigorous quality control process:
- Technical survey: Utilizing specialized moisture meters before application.
- Multi-layer coating systems: Implementing high-penetration Primers and chemical-resistant Topcoats.
- Polyurethane concrete: Specifically designed for areas with stringent hygiene requirements and extreme thermal shock.
- Expert application: Ensuring all technical specifications – from grinding to material mixing are executed with 100% precision.
Conclusion
To optimize workflow and user experience, do not let a peeling floor disrupt your production line or compromise your hygiene standards. Investing in the right system from the start will save you significant maintenance costs in the long run.
Read more: Top 5 reasons to use PU flooring
CONTACT INFORMATION
- Email: marketing@rohdepaints.com
- Address: Gewerbering 22 D-91341 Röttenbach/Germany
- Address: 2/14 Vo Truong Toan, An Khanh W., HCMC, Vietnam
