Trowel Applied Mortar Systems
Trowel applied mortar systems is the heavy build method we use when a bund has to take mechanical loading, thermal shock or chemical attack that a film coating cannot survive. Resin bound mortars and polyurethane concrete are placed by hand, compacted to thickness and finished as a single high integrity layer, sitting between protective coatings and reinforced lay up. Where forklifts roll, hot product spills and drums get dropped, this is the build up that holds.
How Trowel Applied Mortar Systems Work
We treat a trowel mortar system as a placement operation more than a coating one. The material is heavy, fast stiffening and self supporting, and the discipline is getting it down at consistent thickness and properly compacted across the bund. Our standard sequence is:
When Is This Required?
Trowel Mortar Types
Trowel Mortar Performance and Thickness
A typical trowel mortar in bund service is built to substantial thickness in a single placement. The right range depends on what the system has to absorb:
- Light-duty applications: 4–6 mm, where mechanical loading is moderate but a mortar build is preferred over a coating for substrate or wear reasons.
- Standard-duty applications: 6–12 mm, the typical specification for production floors, plant rooms and general-purpose industrial bunds.
- Heavy-duty applications: 12–25 mm, used on tanker offload aprons, drum decks, forge shop floors and any zone with sustained mechanical or thermal loading.
- Extreme-duty applications: 25–50 mm, applied where impact, wear and thermal shock combine, including foundry, heavy industry and high-end food production environments.
Once cured, a properly placed mortar system delivers a robust, monolithic layer with measurable adhesion to the substrate, holiday-free coverage and a service life that typically reaches 15–25 years on demanding duty when properly maintained.
Trowel Mortar Material
The right material depends on the duty above the floor, as chemistry, temperature and the cleaning regime all narrow the choice. The materials in our range that we apply as part of a trowel applied mortar system are:
Epoxy Resins
The most common binder for trowel mortars in industrial bund service, offering a dependable balance of chemical resistance, mechanical performance and value across most duties.
Polyurethane Resins
The basis of polyurethane concrete and PU screed mortars, the natural choice for thermal shock duty and the food and beverage sector where hot CIP and cold handling alternate daily.
Polyurea Resins
Generally not used as the binder in trowel mortar systems because their rapid cure is incompatible with hand placement and compaction. We apply polyurea as a sealing or topcoat layer above a trowel mortar where the duty calls for it.
Vinyl Ester Resins
The standard binder for acid-resistant trowel mortars, used in plating lines, reagent bunds and any acid-handling area where epoxy mortars would be chemically degraded.
Novolac Epoxy Resin
Uprated chemistry for hot acid, hot solvent and elevated-temperature mortar duty, including hot oil quench tanks and severe chemical service.
Advantages of Trowel Applied Mortar Systems
Trowel Mortar Limitations and Considerations
Need a lay-up specified for a demanding bund?
Speak to Reschem about the right laminate build-up, resin choice and inspection regime for aggressive chemical duty, confined structures or long-life containment assets.
When to Choose Trowel Applied Mortar Systems
We specify a trowel mortar build up when one or more of these apply:
Forklift, Drum and Plant Traffic Resistance
The bund will see significant forklift, drum or plant traffic that a coating film could not survive
Thermal Shock Resistance
Hot product spillage or steam cleaning will create thermal shock that rigid coatings cannot absorb
Heavy Mechanical Wear
The duty involves heavy mechanical wear. Tanker offload aprons, drum decks, forge floors foundry slabs
High-build Rebuild
The substrate has surface damage that justifies a high-build rebuild rather than a thin-film overlay
Structural Wearing Surface
A monolithic, structural wearing surface is required as part of the bund's design rather than a sacrificial layer
Chemical and Mechanical Performance
The operator wants a single specification that delivers both chemical and mechanical performance, with the topcoat and barrier integrated into the mortar
Slip Resistance
Slip resistance and underfoot durability are essential, including in food and beverage hygiene-led environments
Trowel Mortar Applications and Industries
Trowel applied mortar systems are the heavy duty default across several sectors and structure types:
Food & Beverage
Polyurethane concrete production floors, ingredient stores, cold rooms and hot CIP areas where thermal shock and hygiene are both part of the design case.
Chemical Processing
Acid bund mortars, plating lines and reagent stores where vinyl ester and novolac mortars hold up under aggressive chemistry.
Oil, Gas and Petrochemical
Tanker offload aprons, drum decks and heavy-duty forecourt areas where vehicle and drum movement combine with hydrocarbon exposure.
Sewage and Waste Water Treatment
Sludge cake reception floors, lorry loading bays and tipping areas where mechanical wear and BSA chemistry meet.
Power Generation and Transmission
Transformer maintenance bays, generator yard aprons and standby fuel offload zones with vehicle loading.
Agriculture & Aquaculture
Silage clamp wear floors, AD plant tipping floors and feed pad bunds with tractor and trailer movement.
Nuclear Facilities
Shielded floors, decommissioning yard hardstanding and heavy-duty handling areas where mechanical and chemical loading combine.
Surface Preparation Requirements
Trowel Mortar Quality Assurance and Testing
Trowel Applied Mortar System FAQs
Most trowel mortar projects cause moderate to high disruption over several consecutive days, covering aggressive substrate prep, slurry coating, mortar placement and cure before the bund can return to service. Programmes are usually compressed into planned shutdowns rather than spread across phased outages, since cold joints between batches are a common failure point.
Substrate preparation typically takes one to two days, slurry coat and mortar placement one to two days for a moderately sized bund, and cure 16–48 hours before any topcoat or return-to-service load is applied. A standard heavy-duty bund is usually ready to return to service four to seven working days from arrival on site.
A correctly specified and maintained trowel mortar system typically delivers 15–25 years of service under demanding duty, with polyurethane concrete and vinyl ester mortars sitting at the upper end of that range. Heavy-traffic areas such as tanker offload aprons may need localised refresh inside the period, but the underlying mortar will outlast most film coatings by a wide margin.
Generally, no. trowel mortar systems require a deeply profiled, mechanically prepared concrete substrate, and an existing lining must be removed before the new mortar is placed. The exception is where the existing lining is itself a trowel mortar in sound condition; in that case, a compatible overlay can sometimes be specified after surface preparation and adhesion testing.
Trowel mortars are temperature and humidity sensitive — pot life shortens in hot conditions, cure slows and flow suffers in cold conditions, and high humidity affects both substrate moisture and surface condensation. We monitor air and substrate temperature, dew point and humidity continuously across the application, and only proceed within the manufacturer’s stated envelope for the chosen system.
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