Maintenance Guide for Industrial Floors: Inspection of Epoxy Coating, Expansion Joints and Drains

1. Scope and Purpose

This guide defines critical procedures for the inspection and preventive maintenance of industrial floors that incorporate epoxy coatings, expansion joints, and drainage systems. Its application is mandatory in manufacturing environments, warehouses and processing areas where soil integrity is essential for operational safety, hygiene and process efficiency.

The purpose is to provide a clear and direct maintenance protocol for technicians, ensuring early identification of wear, damage or failures in the floor structure. Adherence to this guide will prolong the useful life of the floors, minimize the risks of accidents due to tripping or sliding, prevent contamination of products and ensure compliance with safety and industrial hygiene regulations, such as the UNE-EN 1504 series (products and systems for the protection and repair of concrete structures) and EN 13813 (flooring materials).

This maintenance should be performed as part of a quarterly or semiannual preventive program, and immediately after any significant spill, mechanical impact, or detection of anomalies during daily visual inspections.

2. Safety Precautions

CRITICAL SAFETY WARNING: Before starting any maintenance task on industrial floors, it is essential to evaluate the risks inherent to the work area. Ensure adequate signage of the area and, if the intervention requires interaction with machinery, it is mandatory to implement a Lockout Tagout (LOTO) procedure in accordance with local regulations to de-energize and secure all energy sources.
PERSONAL PROTECTIVE EQUIPMENT (PPE): The use of appropriate PPE is non-negotiable. This includes, at a minimum:

• Safety footwear: With reinforced toe cap and non-slip sole (UNE-EN ISO 20345).
• Safety glasses: With side protection (UNE-EN 166) for protection against splashes or particles.
• Nitrile gloves: Chemical resistant (UNE-EN 374) during cleaning or handling resins.
• Respiratory mask: With filters for organic vapors (UNE-EN 140/14387) if strong cleaning chemicals or epoxy resins are handled.
• Hearing protection: If noisy pressure cleaning equipment is used (UNE-EN 352).

CHEMICAL HAZARDS AND VENTILATION: During cleaning or repair with resins, ensure adequate forced ventilation to dissipate vapors. Avoid direct inhalation of fumes and prolonged contact with skin. Have spill kits and specific neutralizers nearby. Keep escape routes clear at all times.

3. Tools and Materials Required

The following table details the minimum equipment essential to carry out industrial floor maintenance tasks.

4. Pre-Maintenance Inspection Checklist

Before starting any intervention, carry out a detailed visual and tactile inspection, recording the observations in the table below. This phase is critical to determining the exact extent of repairs needed.

5. Step by Step Procedure

Follow these steps sequentially to ensure complete and effective maintenance of the industrial floor.

1. Preparation and Delimitation of the Work Area

   Action: Clearly delimit the work area with safety tape. Post “Restricted Access” or “Wet Floor” signage as appropriate. Verify that the ventilation of the area is adequate, using industrial fans if necessary to renew the air and dissipate possible vapors. Ensure that no mobile equipment is operating in direct proximity.

   Safety: WARNING: Ensure lockout and tagout (LOTO) of any nearby equipment that may pose a risk of entrapment or energy release during ground maintenance. Disconnect and tag out power switches if working on drains with pumps or associated electrical systems.

   Visual: Intervention area clearly marked and free of unauthorized personnel. Active and noticeable ventilation.

   Common error: Not delimiting the area properly, which can cause incidents with personnel or vehicles other than maintenance.

2. Preliminary Floor Cleaning

   Action: Remove manually or with an industrial vacuum cleaner all coarse solid debris (dust, chips, debris) from the floor surface. Next, use a pressure cleaning equipment (120-150 bar, with water at 60°C) applying a neutral industrial detergent (pH 7-8). Work in sections, ensuring even coverage. Rinse thoroughly with clean water at low pressure to remove all traces of detergent and loose residue.

   Visual: Visibly clean surface, free of dust, grease, oils and particles. Rinse water should be clear.

   Common mistake: Not completely removing solid debris before pressure washing, which can scratch the coating or push dirt into the joints.

3. Detailed Inspection of Epoxy Coating

   Action: Perform a thorough visual inspection of the entire epoxy surface. Specifically look for: cracks (especially those wider than 0.5 mm), delaminated areas, blisters, bubbles, or peeling of the substrate. Use the inspection hammer to gently tap the surface: a hollow sound indicates subsurface delamination. Check the residual thickness of the coating with a thickness gauge; a thickness of less than 2 mm in high traffic areas is critical. In areas designated for slip resistance, use the roughness meter to ensure that the Rt profile is not less than 30 µm.

   Visual: Uniform coating, without surface or structural defects. Absence of hollow sounds when hitting.

   Common mistake: Ignoring small cracks or subtle color changes, which can be early indicators of larger problems if not documented and monitored.

4. Inspection and Cleaning of Expansion Joints

   Action: Examine each expansion joint. Evaluate the integrity of the sealant: it should be flexible, well adhered to both edges of the joint, and free of cracks or tears. Measure the width of the joints with a tape measure (the standard is usually 20-30 mm). Carefully remove any buildup of debris, dirt or foreign materials from the joints using a putty knife and cutting blade. Vacuum debris from gaps.

   Values: Verify that the sealant shows adhesion on at least 80% of its total length.

   Visual: Clean joints, intact and elastic sealant, free of foreign materials.

   Common error: Failure to completely remove old sealant and residue before considering a fill, which compromises the adhesion of the new material.

5. Drainage System Check

   Action: Remove all grates from sumps and drains. Thoroughly clean any buildup of solids, sediment, grease or sludge from the lines and traps. Visually inspect accessible pipes for corrosion, cracks or misalignments. Pour a small amount of water to check the slope of the soil towards drainage; The water should flow freely without stagnating. Check for any unusual odors that could indicate blockages or buildup of organic matter in the siphon or net.

   Visual: Clean grates, clear ducts, efficient water flow without stagnation. Absence of odors.

   Common error: Ignoring inspection of the outlet pipe or siphons, which can lead to recurring blockages and hygiene problems.

6. Minor Repairs (If Applicable)

   Action (Cracks in Epoxy): If cracks larger than 0.5 mm are detected, open them with a "V" shaped cutting tool with an approximate depth of 10 mm and a width of 5 mm. Thoroughly clean the crack, vacuuming up all the dust. Mix the epoxy repair kit (two-part resin, e.g., 2:1 resin/hardener) following the manufacturer's instructions; The pot life of the mixture is usually 20 minutes at 20°C. Apply the mixture to the crack, compacting the material well. Trowel to level with existing surface.

   Action (Damaged Joints): Completely remove damaged sealant using the cutting blade and putty knife. Clean the edges of the gasket. If necessary, apply a primer compatible with the elastic putty (polyurethane or flexible epoxy) and the substrate, respecting the drying times. Fill the joint with the new elastic caulk using the application gun, ensuring optimal contact with the joint flanks and a slightly concave surface to allow for expansion.

   Safety: WARNING: When mixing and applying epoxy resins and sealants, always use nitrile gloves and a respiratory mask with filters for organic vapors. Ensure constant and adequate ventilation of the area to prevent the accumulation of vapors.

   Visual: Level repairs, without excess material, with good aesthetic finish and integration.

   Common mistake: Failure to adhere to epoxy mixing ratios or drying times, which can result in a weak repair or incomplete curing.

7. Final Cleaning and Reorganization

   Action: Once repairs and checks are completed, clean up any remaining repair materials. Remove all tools from the work area. Remove safety signage only when the area is completely safe and passable. Check that the ground is dry and safe for traffic.

   Visual: Work area cleaned, cleared, and restored to normal operating condition.

   Common error: Not carrying out a thorough final cleaning, leaving residue that can cause slipping or contaminate the environment.

6. Post-Maintenance Verification Checklist

After completion of the maintenance, it is mandatory to carry out a final verification to confirm the correct execution of the works and the restoration of the functionality of the floor.

7. Troubleshooting Guide

This table provides a quick reference to diagnose and correct common industrial flooring problems.

8. Recommended Maintenance Schedule

The following table establishes a preventive maintenance program to optimize the durability and functionality of industrial floors.

9. Spare Parts Reference

Maintaining an adequate inventory of parts and materials is essential for a quick response to any repair needs. Consult the UNITEC-D e-catalog for orders.

To purchase these materials and other components, visit our e-catalog: www.unitecd.com/e-catalog/

10. References

• UNE-EN 1504: Products and systems for the protection and repair of concrete structures.
• EN 13813: Pavement materials – Properties and requirements.
• Technical manuals from epoxy coating manufacturers (e.g. Sika, BASF, RPM).
• Local health and safety regulations at work.