Industrial flooring specification guide
How Thick Should Industrial Resin Flooring Be?
Industrial resin flooring thickness can range from a thin protective coating
to a heavy-duty screed several millimetres thick. There is no single correct
thickness for every factory, warehouse or food-production floor. The system
should be selected around traffic, impact, chemicals, temperature, cleaning,
substrate condition and the required service duty.
be selected around the actual operating conditions rather than one standard figure.
How thick should an industrial resin floor be?
It depends on the flooring type and service duty. Thin seals and coatings can
be measured in fractions of a millimetre, while self-smoothing systems are
typically several millimetres thick and heavy-duty resin floors can exceed 6mm.
Thickness alone does not determine whether a floor is suitable. Resin chemistry,
system build, aggregate, substrate preparation and the actual operating conditions
all matter.
Industry classification
Industrial resin flooring thickness according to FeRFA classifications
FeRFA classifies synthetic resin flooring into eight types, progressing from
light-duty seals through to very-heavy-duty resin flooring.
| FeRFA type | Flooring system | Typical thickness | Typical duty classification |
|---|---|---|---|
| Type 1 | Floor seal | Approx. 150 microns | Light |
| Type 2 | Floor coating | Approx. 150–300 microns | Light to medium |
| Type 3 | High-build floor coating | Approx. 300–1000 microns | Medium |
| Type 4 | Multi-layer flooring | More than 2mm | Medium to heavy |
| Type 5 | Flow-applied / self-smoothing flooring | Approx. 2–3mm | Medium to heavy |
| Type 6 | Resin screed flooring | More than 4mm | Medium to heavy |
| Type 7 | Heavy-duty flowable flooring | Approx. 4–6mm | Heavy to very heavy |
| Type 8 | Heavy-duty resin flooring | More than 6mm | Very heavy duty |
These are FeRFA classification ranges rather than a rule that every floor in
a given environment must use one particular thickness.
Specification first
A thicker resin floor is not automatically a better resin floor
It can be tempting to compare resin floors using thickness alone.
That is too simple.
A thicker system designed for one environment is not automatically better
than a thinner system correctly selected for another.
The flooring build should take account of:
- type and frequency of traffic
- forklift and pallet movements
- static and dynamic loading
- impact
- chemicals
- water and cleaning
- temperature
- slip requirements
- substrate condition
- required life and maintenance expectations
FeRFA’s selection guidance specifically recommends considering service conditions
and flooring thickness together rather than specifying thickness in isolation.
View FeRFA’s Guide to the Selection of Synthetic Resin Flooring
.
What determines thickness?
Six factors that influence industrial resin flooring thickness
01
Traffic
Pedestrian traffic, pallet trucks, forklifts and loaded vehicles create
very different flooring demands.
02
Impact
Dropped tools, production components and machinery can require a heavier
flooring build than ordinary foot traffic.
03
Temperature
Hot washdown, process heat and rapid temperature change can influence both
resin technology and system thickness.
04
Chemicals
The exact substance, concentration, temperature and contact time should be
checked against the selected manufacturer’s system.
05
Substrate
Weak, damaged or contaminated concrete needs to be addressed before relying
on the new flooring system.
06
Environment
A dry warehouse, wet food factory and engineering workshop can require
very different resin flooring builds.
Thin resin systems
When are resin coatings suitable?
Thin resin coatings can be appropriate where the duty is relatively light
or moderate and the substrate is in suitable condition.
They can be used for purposes such as:
- dust reduction
- surface protection
- colour improvement
- easier cleaning
- light or moderate industrial traffic
- selected storage or plant areas
A coating should not be confused with a heavy-duty screed.
If the environment includes heavy impact, extreme traffic, hot washdown or
other demanding exposure, a thin coating may not provide the required build.
Explore
Industrial Floor Coatings
.
Higher-build epoxy systems
When might a multi-layer or high-build resin floor be used?
Industrial resin flooring is not limited to one thin coat.
Multi-layer systems can combine primers, body coats, aggregate scatter and
topcoats to create a heavier flooring build.
These systems can be considered where the site requires:
- greater wear resistance
- forklift or pallet traffic
- additional texture
- a heavier-duty warehouse floor
- a more substantial build than a basic coating
The exact build should come from the chosen manufacturer’s specification
rather than creating an arbitrary thickness on site.
Read more about
Epoxy Resin Flooring
.
Flow-applied flooring
How thick is self-levelling resin flooring?
FeRFA Type 5 flow-applied flooring is typically around 2–3mm thick.
These systems are often described as self-smoothing or self-levelling floors
and can provide a smooth seamless surface across suitable industrial and
commercial environments.
The final specification still depends on the intended use and manufacturer
system.
A 2–3mm self-smoothing floor should not automatically be expected to perform
like a heavy-duty screed above 6mm where severe impact, temperature or process
conditions are involved.
Explore
Self-Levelling Resin Flooring
.
Heavy-duty flooring
How thick is polyurethane screed flooring?
Heavy-duty PU screed systems are available in different thicknesses depending
on their intended duty and the selected manufacturer’s specification.
Greater build depth can become particularly relevant where the floor needs to
deal with combinations of:
- heavy impact
- hot water
- thermal change
- wet processing
- chemicals
- heavy industrial traffic
- food-production conditions
Thickness should not simply be increased without reason. The selected system
should match the real exposure conditions.
Explore
Polyurethane Screed Flooring
.
Genuine SRS heavy-duty project
450m² Cardiff project using 9mm heavy-duty PU screed
SRS completed approximately 450m² of heavy-duty flooring inside a former
Cardiff welding workshop being converted into a training centre.
The existing concrete was mechanically prepared by diamond grinding.
Cracks and local defects were repaired before the flooring installation.
SRS then installed a 9mm Resdev Pumadur HF heavy-duty polyurethane
screed in dark grey.
The heavy-duty PU system was selected around impact resistance, durability
and the expected use of the refurbished facility.
The project, including preparation, repairs, flooring installation and joint
works, was completed in four days.
View the
450m² Cardiff Heavy-Duty Resin Flooring Case Study
.
Genuine food-processing project
Ebbw Vale food facility using 6–9mm PU screed
The relationship between floor thickness and service conditions can also be
seen in SRS’s 120m² food-processing project in Ebbw Vale.
After removing the old floor and mechanically preparing the concrete, SRS
installed a 6–9mm Resdev Pumadur HF polyurethane screed.
The project also included approximately 55 linear metres of resin coving.
The floor was specified around hygiene, hot-water exposure, chemical resistance,
durability and the conditions inside the food-processing area.
The complete flooring package was delivered in three days.
Warehouse floors
How thick should warehouse resin flooring be?
There is no universal warehouse thickness.
A light storage area and a distribution centre with constant loaded forklift
traffic should not automatically receive the same flooring build.
Important factors include:
- forklift type and frequency
- vehicle loading
- turning areas
- pallet movements
- loading bays
- existing substrate condition
- impact risk
- maintenance expectations
In some warehouses, a correctly specified epoxy system can provide the required
performance without installing a heavy PU screed.
The objective is to specify enough flooring for the duty without treating
thickness as the only measure of quality.
Food factories
Why food factory flooring may need a heavier build
Food-production environments can place demands on a floor that do not exist
inside a typical dry warehouse.
These can include:
- hot washdown
- process water
- food acids
- cleaning chemicals
- oils and fats
- impact
- trolleys and production traffic
- hygiene requirements
Heavy-duty polyurethane screed is commonly considered for demanding wet
processing areas, with system thickness selected around temperature,
chemicals and service conditions.
Thickness cannot fix the substrate
A thicker resin floor does not compensate for poor concrete preparation
Increasing the flooring thickness cannot correct an unsuitable substrate.
Before a new system is installed, issues can include:
- weak concrete
- dusty surfaces
- oil contamination
- old failed coatings
- cracks
- damaged joints
- holes
- poor previous repairs
Mechanical preparation and repairs remain essential parts of the complete
flooring system.
A heavy resin floor installed onto weak or contaminated material can still
inherit the problems underneath it.
Explore
Industrial Floor Preparation and Repairs
.
Thickness and cost
Does thicker industrial resin flooring cost more?
Generally, a heavier flooring build requires more material and may involve
additional labour, but thickness is only one part of the final quotation.
Price can also be affected by:
- mechanical preparation
- existing coating removal
- concrete repairs
- contamination
- floor area
- coving and drainage
- anti-slip requirements
- access
- phasing
- shutdown restrictions
This means comparing two quotations purely by the stated thickness can also
be misleading if the preparation, system type and scope of repair work are different.
Read our
Resin Flooring Cost Guide
.
Avoid over-specifying
The thickest system is not automatically the best value
Industrial flooring should be heavy enough for the duty, but unnecessarily
increasing the system build can add cost without solving the real problem.
For example, if premature failure is being caused by:
- oil contamination
- poor preparation
- weak concrete
- incorrect joint treatment
- moisture
simply specifying a thicker top layer does not remove those underlying issues.
The specification should address the cause of the risk rather than using
thickness as a substitute for proper assessment.
Not sure what thickness your floor needs?
Give SRS the operating conditions before choosing the build
These details help establish which resin flooring system and thickness should
be assessed.
Continue your research
Related industrial resin flooring information
Frequently asked questions
Industrial resin flooring thickness FAQs
What is the normal thickness of industrial resin flooring?
There is no single normal thickness. FeRFA classifications range from thin
seals and coatings measured in fractions of a millimetre through to heavy-duty
resin flooring above 6mm. The correct build depends on the intended duty.
How thick is an epoxy floor coating?
FeRFA Type 2 floor coatings are typically around 150–300 microns, while
Type 3 high-build coatings are typically around 300–1000 microns. Heavier
epoxy systems can use multi-layer or flow-applied builds above these levels.
How thick is self-levelling resin flooring?
FeRFA Type 5 flow-applied or self-smoothing resin flooring is typically
around 2–3mm thick.
How thick is heavy-duty resin flooring?
FeRFA Type 7 heavy-duty flowable flooring is typically around 4–6mm,
while Type 8 heavy-duty resin flooring is generally above 6mm.
Is 9mm PU screed used in industrial buildings?
Yes, where the manufacturer system and operating conditions call for that
build. SRS installed a 9mm Resdev Pumadur HF heavy-duty PU screed on a
450m² Cardiff project.
Does forklift traffic always need the thickest resin floor?
No. Forklift type, loading, frequency, turning movements, substrate condition
and the complete resin system should all be considered. Thickness alone does
not define performance.
Does thicker resin flooring last longer?
Not automatically. A heavier build can be appropriate for heavier duty,
but service life also depends on preparation, substrate quality, resin
technology, traffic, chemicals, temperature and maintenance.
Can a thicker resin floor be installed over damaged concrete?
Damaged, weak or contaminated concrete should still be properly prepared
and repaired. Adding extra resin thickness should not be used as a substitute
for creating a suitable substrate.
Industrial resin flooring specification
Choose the thickness around the duty, not a standard number
Send Superior Resin Solutions photographs, floor area, substrate condition,
traffic, impact, cleaning, temperature and chemical exposure. We can discuss
which resin flooring build should be assessed for the project.
