Build the coating system from the concrete upward

Price a specified coating system, not the word epoxy

“Epoxy floor” can mean a thin coloured coating, a high-build system, flake broadcast, self-levelling resin, mortar screed or part of a chemically resistant multi-layer build. Performance depends on substrate, preparation, thickness, product compatibility and use. The calculator therefore asks for primer, build coat and topcoat separately.

Each layer multiplies adjusted application area by coat count and divides by the entered kit coverage, rounding upward to whole kits. Use coverage at the specified film build and surface condition, not the largest marketing coverage. Porous or rough concrete may consume more primer.

Some systems omit a primer or separate topcoat. Enter zero coats for that layer, but retain a positive coverage value so the form remains valid. Never remove a layer solely to reduce the calculator total; follow the manufacturer’s written system and project specification.

Whole-kit rounding reflects packaging, not mixing freedom

The application allowance increases net area before kit rounding. It can cover roller loss, texture and reasonable application variation, but it is not a substitute for measuring coves or vertical surfaces. Add those quantities to the system schedule when they receive the same coating.

Two-part products must be mixed at the specified ratio. A whole kit may be the smallest safe batch unless the manufacturer provides an approved method for proportioning components. Do not stretch material beyond the coverage needed to achieve film thickness.

Pot life and working time can shorten with temperature and larger mixed volume. Plan crew, batch size and pour sequence so material is applied within limits. The reported coverage surplus is the sum of unused nominal coverage across all active coating layers, not physical leftover product that can necessarily be stored after mixing.

Concrete preparation determines bond and appearance

Substrate work can include cleaning, degreasing, removal of weak coatings, grinding or shot blasting, laitance removal, profiling, vacuuming, repairs and inspection. The preparation rate applies to net area; specify the required profile and contamination-removal method in the quote.

Cracks and joints need classification, not just filling. Dormant cracks, moving joints, construction joints and structural movement require different details. Coating across an active joint can reflect the crack through the finish. Measure treatment separately and retain designed movement where required.

Grinding concrete can generate respirable crystalline silica. Safe Work Australia guidance addresses work with crystalline silica substances, including concrete floor grinding. Use effective controls, suitable equipment, isolation and competent planning under the applicable work health and safety rules. A household vacuum and disposable mask are not a control plan.

Moisture testing belongs before the product order

Moisture vapour, hydrostatic pressure, groundwater, recent concrete and failed damp control can cause blistering or loss of adhesion. Surface dryness does not prove the slab meets a coating system’s moisture limits. Use the specified test method, locations, conditioning and acceptance criteria.

The mitigation area may be less than net area only where investigation and design support a local treatment. A widespread moisture source should not be reduced to spot repairs without evidence. Fix leaks and drainage causes where possible.

Testing and mitigation are combined in one entered rate for early planning. A real proposal should separate testing, moisture-control primer or membrane, additional preparation, cure and warranty. Confirm whether the manufacturer warrants the complete build over the measured condition.

Manage chemical hazards from storage through cure

Uncured resins, hardeners, solvents and cleaners can present health or physical hazards. Safe Work Australia explains that safety data sheets describe identity, hazards, handling, storage, first aid and disposal. Obtain the current SDS and product data before the chemical arrives.

Plan ventilation, ignition control, segregation, spill response, skin and eye protection, respiratory control where needed, mixing location and exclusion of occupants or other trades. Personal protective equipment must be selected from the risk assessment and product information; it is not a generic substitute for safer products and engineering controls.

Prevent uncured product from entering soil, sewer or stormwater. Manage containers, contaminated absorbent, grinding dust and leftover chemical under applicable disposal rules. Keep labels intact and do not decant into unlabelled containers.

Odour disappearance does not prove cure or safe re-entry. Follow stated temperature, humidity, ventilation and return-to-service conditions for foot traffic, vehicles, food, animals and chemical exposure.

Specify slip, ultraviolet, heat and chemical exposure

Aggregate can improve slip resistance but also changes cleaning, appearance and coating consumption. Select performance for the expected wet or dry condition, contaminants, footwear and cleaning regime. A coarse surface can be difficult to mop, while a glossy smooth surface may be unsuitable when wet.

Epoxy can discolour under ultraviolet exposure unless the system protects against it. Hot tyres, welding, impacts, oils, acids, alkalis and cleaning chemicals create different demands. Ask for product test evidence relevant to the use rather than relying on a generic “industrial grade” label.

Coving and terminations matter where hygiene, washdown or water containment is required. Define wall height, corners, drains, doorways and joints. The calculator applies a lineal rate but does not generate the profile or waterproofing detail.

Compare epoxy flooring quotes layer by layer

Require each bidder to price the same performance and coating build. Confirm licensing, insurance, safety control, protection, sample approval, testing and handover. A thin decorative coating cannot be compared with a high-build broadcast system by square-metre price alone.

Contingency applies after products, preparation, labour and fixed allowances. GST is added only when selected. The per-square-metre output includes whole-kit rounding and shutdown cost, so it is project-specific.

Inspect the finish and retain the system record

Agree inspection criteria for colour, texture, pinholes, coverage, joints, coves and contamination. Film-thickness or other quality checks should follow the specification. Do not accept an extra coat as a universal fix without diagnosing the cause and confirming compatibility.

At handover, retain product and batch records, SDS, technical data, moisture results, preparation record, repair plan, cure conditions, test evidence, warranty and cleaning instructions. Mark areas that have not reached full service cure.

Use compatible cleaning products and inspect high-wear areas, joints and impacts. Prompt repairs can prevent moisture or contaminants entering beneath the coating. The calculator estimates installation only, not periodic recoating or operational downtime in future years.