Warehouse Floor Repairs: Can Damaged Concrete Be Repaired Before Resin Flooring?

Cracks, worn concrete and damaged sections are common problems in warehouses and industrial buildings.

If a business is considering resin flooring, one of the first questions may be: can the existing concrete simply be repaired and coated?

Sometimes, yes.

But the correct answer depends on what caused the damage, the condition of the substrate and what the floor will need to withstand once it is back in service.

Installing resin over a damaged floor without first understanding the substrate can hide a problem rather than solve it.

In this guide, Epoxy Guys explains what businesses should consider when repairing a warehouse or industrial concrete floor before a resin flooring system is installed.

Does concrete need to be perfect before resin flooring?

No, an existing concrete floor does not necessarily need to look perfect before a resin system can be considered.

Warehouses and factories often have floors that have been in service for years.

They may contain:

• Cracks
• Chips
• Small holes
• Worn areas
• Previous repairs
• Old coatings
• Surface contamination
• Uneven sections
• Damage around working or traffic areas

Some defects may be repairable as part of the preparation process.

However, there is an important difference between surface defects that can be prepared and repaired, and problems that indicate a more significant issue with the substrate.

The existing floor should therefore be assessed rather than automatically covered.

Why has the warehouse floor cracked?

Not all cracks are the same.

A crack can exist for different reasons, and understanding the likely cause is important before deciding how it should be treated.

Factors can include movement, shrinkage, impact, previous construction details or other conditions affecting the slab.

Simply filling a crack does not necessarily remove the reason it appeared.

Where cracking appears significant, continues to move, or suggests a structural issue, specialist assessment may be required before a resin flooring system is considered.

Resin flooring should not be described as a structural repair solution.

Can cracks be repaired before epoxy flooring?

Some cracks and localised defects can be repaired during floor preparation, as part of resin floor repairs, before a resin system is applied.

The appropriate repair method depends on factors such as:

• The type of crack
• Its width and depth
• Whether movement is suspected
• The condition of the surrounding concrete
• The proposed resin flooring system
• How the finished floor will be used

The aim is not simply to make the crack disappear visually.

The repair needs to form part of preparing a suitable substrate for the flooring system that follows.

What about holes and damaged concrete?

Warehouses can develop damaged areas through years of traffic, impact, machinery or general use.

Localised holes, spalling or damaged sections may require repair before resin installation.

Loose or unsound material should not simply be coated over.

The damaged area needs to be assessed and prepared so that any repair and subsequent flooring system are being installed onto an appropriate substrate.

If deterioration is widespread, the project may require more extensive remedial work before resin flooring can begin.

What if the warehouse already has an old coating?

Existing coatings need to be considered during preparation.

The fact that an old coating is still present does not automatically mean it is suitable to receive another system.

Areas may be:

• Peeling
• Flaking
• Poorly bonded
• Worn through
• Contaminated
• Incompatible with the proposed system

Depending on the existing floor, mechanical preparation may be required to remove unsuitable coatings and expose an appropriate substrate.

The preparation should be based on the condition of the floor rather than simply applying another coat over what is already there.

Why mechanical floor preparation matters

Preparation is one of the most important stages of a resin flooring project.

Depending on the substrate and specified system, mechanical preparation such as diamond grinding may be used. UK industry body FeRFA classifies resin flooring into different types according to construction and expected duty, which is one of the factors influencing the preparation required.

The objective is to create a clean and appropriately prepared surface for the following stages of the flooring system.

Preparation can also expose defects that were difficult to see beforehand.

That is useful.

It is better to identify and address a problem during preparation than discover it after a new floor has been installed.

What about oil and contamination?

Industrial floors may have years of exposure to oils, grease, chemicals or other contaminants.

This matters because contamination can affect the substrate and the ability of a resin system to bond appropriately.

Cleaning the visible surface does not always tell the full story.

Where contamination is present or suspected, it needs to be considered during assessment and preparation. Contamination is also a significant factor in slip risk, and the Health and Safety Executive publishes guidance on workplace flooring covering how floors are used and cleaned.

The appropriate approach depends on the contaminant, its extent and the flooring system being considered.

Does moisture matter before resin flooring?

Moisture conditions can be relevant to resin flooring.

The substrate and site conditions should therefore be considered before installation.

Where moisture is suspected to be an issue, the appropriate assessment and product/system guidance should be followed.

A resin coating should not be presented as a universal solution for an unidentified moisture problem.

Where additional investigation or a specialist system is required, that should be established before installation.

Can uneven warehouse floors be covered with resin?

Resin flooring should not automatically be treated as a way to correct every uneven concrete floor.

Minor imperfections may be dealt with as part of an appropriate flooring build-up, but significant unevenness or substrate defects may require additional preparation or remedial work.

The required approach depends on:

• Existing floor condition
• Required finished level
• Traffic
• Drainage or falls where relevant
• Proposed resin system
• Operational requirements

This should be established before materials are ordered.

When might a floor need more than a local repair?

Some floors require more than crack filling and localised repairs.

Further investigation or remedial work may be appropriate where there is:

• Widespread deterioration
• Significant movement
• Extensive delamination or weak concrete
• Serious unevenness
• Persistent moisture-related concerns
• Large areas of contamination
• Damage suggesting an underlying structural problem

Resin flooring is a finish and protection system, not a substitute for resolving significant structural defects.

If specialist concrete or structural work is required, that should be dealt with before the resin flooring stage.

What happens after the repairs?

Once the substrate has been appropriately prepared and required repairs completed, the specified resin flooring build-up can begin.

The exact stages depend on the chosen system and project, and are set out in our commercial installation process.

They may include:

1. Mechanical preparation
2. Cleaning and assessment
3. Repairs where required
4. Primer or appropriate base stage
5. Resin flooring system
6. Required finish or topcoat
7. Curing before the area returns to service

Not every floor uses the same products or number of layers.

The system should match the environment and the manufacturer’s requirements. Our guide to epoxy resin flooring for factories and warehouses covers system selection in more detail, alongside our factory resin flooring page.

Can repairs be completed while a warehouse remains operational?

Potentially, but this needs planning.

Businesses may need to consider:

• Vehicle routes
• Forklift movements
• Pedestrian access
• Machinery
• Storage areas
• Working zones
• Preparation dust and equipment
• Application areas
• Curing times

For larger premises, work may sometimes be planned in sections where the flooring system and site conditions allow it.

However, areas being prepared, repaired, coated or cured need to remain suitably protected.

Operational requirements should therefore be discussed before work begins.

How much do warehouse floor repairs cost?

There is no universal price for repairing a warehouse floor before resin installation.

The cost depends on the extent and nature of the defects.

A floor containing a few localised repairs is a different project from one with widespread damage, contamination or extensive preparation requirements.

Factors can include:

• Floor area
• Number and type of defects
• Existing coatings
• Contamination
• Preparation requirements
• Repair materials and methods
• Access
• Operational restrictions
• Final resin flooring specification

For a fuller explanation of commercial resin flooring costs in the UK, see our dedicated pricing guide.

Should the floor be inspected before quoting?

Photographs and measurements can provide a useful starting point.

For straightforward projects, they may help establish the likely scope.

For larger, damaged or more complex industrial floors, further assessment may be needed before the final specification is confirmed.

Businesses requesting an initial assessment should provide:

1. Approximate floor area
2. Project location
3. Clear photographs of the entire floor
4. Close-up photographs of cracks or damaged areas
5. Details of existing coatings
6. Information about known contamination
7. What the building is used for
8. Forklift, machinery or vehicle use
9. Preferred timeframe
10. Any restrictions on operational downtime

Planning to refurbish a damaged warehouse or factory floor?

A worn industrial floor does not automatically mean the entire slab needs replacing.

But it also should not simply be hidden beneath a new coating.

The correct starting point is understanding the existing substrate, identifying the preparation and repairs required, and then selecting a resin flooring system appropriate for how the building is used.

Epoxy Guys can assess commercial and industrial resin flooring projects, including commercial flooring refurbishments, and help establish the appropriate next step.

Need an assessment for a damaged commercial floor?