Why identifying the source is essential before epoxy and resin flooring installation
LinkedIn Technical Article
Moisture problems rarely have a single cause
Concrete can absorb and retain moisture throughout its service life. For epoxy, polyurethane, urethane cement and other resin flooring systems, understanding where that moisture originates is a critical part of substrate assessment. Different sources create different risks and may require different corrective measures before an impermeable flooring system is installed.
The principal sources of moisture
1. Mixing water
Fresh concrete requires water for hydration and workability. Water that is not consumed during hydration remains within the pore structure and must dissipate as the slab dries.
2. Ground moisture
Where an effective vapour barrier is absent or compromised, groundwater can migrate upward through the slab by capillary action. This can create persistent moisture conditions and hydrostatic pressure.
3. Rain and weather exposure
Open buildings, delayed roofing, rainfall and flooding during construction can significantly increase slab moisture and extend the time required before flooring installation.
4. Plumbing leaks
Leaks from water supply, drainage or process pipes beneath or within the slab may create localised areas of high moisture that are not always visible at the surface.
5. Cleaning water and industrial operations
Frequent washing, pressure cleaning and wet industrial processes can introduce moisture into concrete, particularly through joints, cracks and other discontinuities.
6. Ambient humidity
Concrete continuously exchanges moisture with the surrounding air. High relative humidity can slow drying and, under some conditions, cause the slab to reabsorb moisture.
7. Condensation
When slab temperature falls below the dew point, condensation can form on or within the surface. This may affect moisture readings and compromise coating adhesion.
8. Hygroscopic salts
Chlorides, nitrates and sulfates can attract moisture from the atmosphere, leaving concrete damp even where there is no obvious source of liquid water.
9. Flooding
Flood events can saturate concrete to significant depths. After flooding, moisture testing should be repeated until the slab satisfies the applicable flooring manufacturer’s requirements.
10. Construction practices
Poor curing, excessive water addition on site, delayed enclosure and inadequate drainage can all contribute to prolonged slab drying.
Identifying the actual source
A reliable diagnosis should combine visual inspection, project history, moisture mapping, relative-humidity testing, plumbing investigations and site observations. The objective is not simply to confirm that moisture is present, but to determine why it is present before corrective action is specified.
| PREMIER FLOORING SYSTEMS BEST PRACTICE Never assume moisture originates from a single cause. Identify the source, quantify the moisture using recognised test methods, and eliminate the root cause before installing a resin flooring system. |
Why this matters for resin flooring
Correctly identifying the moisture source is essential for selecting an effective mitigation strategy and protecting long-term flooring performance. Treating only the visible symptom can leave the underlying cause unresolved and expose the installed system to avoidable risk.
Key takeaway
Moisture in concrete may originate from mixing water, groundwater, rainfall, plumbing leaks, cleaning operations, ambient humidity, condensation, hygroscopic salts, flooding or construction practices. A professional pre-installation assessment should establish both the moisture level and its likely source before the flooring specification is finalised.
About Premier Flooring Systems Ghana
Premier Flooring Systems Ghana provides technical flooring solutions with a strong focus on substrate assessment, preparation and durable resin flooring performance.