The Access Ramp Is In. Why Does the Concrete Join Still Need Grinding Before a Coat of Paint Goes Down?

When a new concrete access ramp meets an existing slab, the join between old and new concrete typically forms a raised lip, rough edge, or uneven transition. Concrete grinding smooths this join to create a coating-ready surface that allows paint, non-slip sealant, or protective coatings to bond properly. Without this preparation step, the finish lifts, cracks, or fails slip-resistance testing, creating safety and compliance risks across NSW commercial, strata, and medical properties .

What Is Concrete Grinding at a New-to-Old Concrete Join on an Access Ramp? New poured concrete rarely meets existing concrete flush. Shuttering, formwork tolerances, curing shrinkage, and minor level differences mean the join between a freshly poured ramp and the original slab almost always carries a lip, ridge, or rough overpour.

Concrete grinding at this join uses diamond-segmented grinding equipment to remove the raised material and feather the two surfaces into a single, even transition. The objective is not to polish the ramp smooth. A ground surface that is too smooth becomes slippery, particularly when wet. The goal is to remove the lip and create a profile that a coating system can grip.

Surface profile , in concrete preparation terms, refers to the texture and roughness of the ground surface. Coating manufacturers specify minimum and maximum surface profiles for their products. A surface that is too smooth will not allow mechanical adhesion. A surface that is too aggressive can cause coating failure through bridging or uneven coverage.

Standards Australia AS 4586 classifies slip resistance for pedestrian surfaces, and the surface profile left by grinding directly affects whether a coated ramp meets the required classification.

Why Does a New Access Ramp Still Need Grinding Before Painting or Coating? The question is reasonable. A ramp has just been poured by a concreter. It looks finished. But concrete pouring and surface coating are two separate trades with different performance requirements.

When a new ramp meets an existing slab, several issues arise at the join:

A visible or tactile lip remains where the formwork sat against the old concrete. Overpour or bleed water creates a weak laitance layer on the surface near the join. Aggregate exposure varies across the old-to-new transition. Minor height differences cause ponding or trip points at the threshold. Paint, non-slip coatings, epoxy systems, and urethane sealants require a specific surface profile to bond correctly. The Australian Building Codes Board , through the National Construction Code (NCC), requires accessways to be designed and finished to minimise trip hazards and provide safe pedestrian movement.

A rough or raised concrete join that has been painted over without preparation does not meet this standard. The paint may look acceptable for weeks or months, then begin to lift, crack, or delaminate at the join, exposing the very hazard the coating was meant to address.

Grinding removes the lip, eliminates laitance, and opens the concrete pore structure so the coating can adhere through mechanical keying.

How Does This Impact Sydney Property Owners, Strata Managers, and Businesses? The impact falls into three categories: safety, cost, and operational disruption.

Safety A poorly prepared concrete join on an access ramp is a trip and slip hazard. In medical centres, aged care facilities, childcare centres, and commercial tenancies with public access, this hazard carries immediate liability exposure.

Under the Work Health and Safety Act 2011 (NSW) , persons conducting a business or undertaking (PCBUs) must manage risks to health and safety, including risks from the physical condition of a workplace. A ramp with a rough or raised join at a public entry is a foreseeable hazard.

Strata properties in Sydney face additional obligations under the Strata Schemes Management Act 2015 (NSW) . Owners corporations are responsible for maintaining common property, which includes accessways, ramps, and entries. A ramp with a failed coating at a concrete join is not merely cosmetic. It is a maintenance failure that the owners corporation is required to address.

Cost The cost of grinding a concrete join before coating is modest compared to the cost of recoating a failed surface. In Sydney’s current construction market, the typical cost to mobilise a concrete grinding crew for a single join preparation on a residential or small commercial ramp ranges from $300 to $800, depending on the length and accessibility of the site.

Compare this with the cost of stripping a failed non-slip coating, regrinding the surface, and reapplying the full coating system, which can run to $2,000 to $5,000 or more for the same ramp.

Operational Disruption A ramp that must be closed for remediation after a coating failure means temporary access arrangements, signage, and potential compliance issues if the ramp is the primary accessible entry.

In medical centres and commercial buildings, this disruption has direct business impact. Getting the surface preparation right before the first coat of paint eliminates the risk of a second mobilisation.

Why Is This Important for NSW Compliance and Accessibility Standards? New South Wales has specific requirements that apply to access ramps in commercial, strata, and public-use buildings.

The Disability Discrimination Act 1992 (Cth) and Disability (Access to Premises - Buildings) Standards 2010 require that buildings provide equitable access for people with disabilities. Access ramps are a critical part of this requirement.

A ramp with a rough concrete join that creates a trip point, or a coated surface that has degraded at the join and lost its slip-resistance rating, does not meet these standards.

The NCC Volume One, Part D2, addresses access and egress, including requirements for the gradient, width, and surface finish of ramps. Safe Work Australia provides guidance on managing the risks of slips, trips, and falls in workplaces. The relevant standard for the slip-resistance classification of pedestrian surfaces is AS 4586:2013, and the selection of appropriate surfaces for different applications is guided by HB 198:2014.

For Sydney property owners and managers, the compliance position is clear: an access ramp must be safe, and its surface must perform as specified. Concrete grinding at the join between old and new slabs is a preparation step that directly affects whether the finished ramp meets the required standards.

Compliance Requirements and Their Relevance to Ramp Joins National Construction Code (NCC) Part D2

Ramp surfaces must minimise trip hazards. AS 4586:2013 Slip Resistance

Coated surfaces must meet pedestrian slip classification requirements. Disability (Access to Premises) Standards 2010

Equitable access requires safe, even surfaces. Work Health and Safety Act 2011 (NSW)

PCBUs must manage foreseeable physical hazards. Strata Schemes Management Act 2015 (NSW)

Owners corporations must maintain common property accessways. What Does Poor Concrete Join Preparation Typically Cost in Sydney? The following comparison provides a general indication of costs and outcomes for properties in the Sydney metropolitan area. Figures reflect typical market ranges and are indicative only.

Concrete grinding of ramp join before coating

Approximate cost: $300 to $800 Outcome: Coating-ready surface, even transition, compliant finish Full coating reapplication after join failure

Approximate cost: $2,000 to $5,000+ Outcome: Second mobilisation, access disruption, and rework Slip or trip injury claim at a commercial property

Approximate cost: Variable, potentially tens of thousands of dollars Outcome: Legal liability, insurance claim, and possible WHS investigation Strata common property remediation order

Approximate cost: $1,500 to $4,000+ Outcome: NCAT order and urgency premium Getting the preparation right on the first pass is the most cost-effective approach.

What Are the Risks of Skipping Concrete Grinding on Ramp Joins? Coating failure at the join. Paint and non-slip coatings bond to the surface profile. An unground join with laitance, overpour, or a lip will not hold the coating. The coating lifts, peels, or cracks within months. Trip and slip hazards. A raised lip or rough join that has been painted over does not disappear. The paint may smooth the visual appearance temporarily, but the underlying height difference remains. Pedestrians, including those using mobility aids, wheelchairs, or walking frames, are placed at risk. Water ingress and deterioration. A poorly bonded coating at the join allows water to penetrate behind the coating layer. In Sydney’s climate, with regular rainfall and temperature cycling, this water accelerates concrete deterioration, reinforcing steel corrosion, and further coating breakdown. Compliance and liability exposure. Once a coating has been applied and the ramp is open for use, the property owner or manager is responsible for its condition. A ramp that fails a slip-resistance assessment or presents a trip hazard after coating is a compliance liability that the owner or strata corporation must address at their cost. Reputational damage. For commercial properties, medical centres, and strata buildings, visible coating failure at a main entry ramp reflects poorly on property management. Tenants, patients, visitors, and prospective buyers form judgements about a building from its entry. What Is the Correct Process for Preparing a Concrete Ramp Join for Coating? Inspection and measurement. A qualified operator inspects the join to identify the lip height, surface condition, and any laitance or overpour. A straightedge or profile gauge measures the height difference across the join. Equipment selection. Based on the join condition, the operator selects the appropriate diamond grinding tooling. Softer concrete requires harder bond segments. Harder concrete requires softer bond segments. The tooling must be matched to the concrete to achieve the correct surface profile without over-grinding. Grinding the join. The operator grinds the high side of the join to bring it level with the lower side, feathering the transition across a width of 100 to 300 millimetres depending on the height difference. The aim is a gradual, even transition with no perceptible lip underfoot. Surface profiling. After the lip is removed, the operator profiles the full ramp surface within the join zone to the specification required by the coating manufacturer. This typically means a Concrete Surface Profile (CSP) of 3 to 5 for most non-slip coating systems, as defined by the International Concrete Repair Institute (ICRI) . Cleaning and dust removal. All grinding dust and debris is removed from the surface using industrial vacuum extraction attached to the grinding equipment, followed by a final clean. The surface must be dust-free before coating. Coating application. The paint or non-slip coating system is applied to the prepared surface within the coating manufacturer’s specified window, typically within 24 hours of grinding, to avoid surface contamination. This process ensures the finished ramp is safe, compliant, and built to last.

Your Ramp Needs the Right Surface Before the First Coat Goes On Elyment’s project coordination team inspects, measures, and prepares concrete joins on access ramps across Sydney. Get a straightforward assessment and quote for your commercial, strata, or residential property.

Request a Free Site Assessment and Quote

Why Choose Elyment Property Services for Concrete Grinding in NSW? Elyment Property Services operates from its warehouse, showroom, and offices in Rouse Hill, Sydney. The team handles concrete grinding, floor levelling, adhesive removal, flooring supply and installation, and surface preparation across commercial, strata, and residential projects throughout the Sydney metropolitan area.

Elyment’s approach to ramp join preparation is methodical. Each project begins with a site assessment to measure the join, evaluate the concrete condition, and identify the correct coating specification. The grinding work is carried out using professional-grade diamond equipment with integrated dust extraction, and the surface is finished to the profile required by the coating manufacturer.

Elyment holds a 5-star rating on Google, reflecting consistent delivery across its project portfolio. The team coordinates the grinding and preparation work directly with painters, coating applicators, and property managers to ensure the surface is prepared to the right specification, at the right time, and within the coating manufacturer’s application window.

For Sydney property owners, strata managers, and businesses with a new access ramp that needs the concrete join prepared before painting, Elyment provides a straightforward process: inspect, quote, prepare, and hand over to the coating team with a surface that is ready to perform.

Contact Elyment’s project coordination team to request a site assessment and quote.

Sources and References National Construction Code (NCC), Australian Building Codes Board AS 4586:2013, Slip resistance classification of new pedestrian surface materials, Standards Australia HB 198:2014, Guide to the specification and testing of slip resistance of pedestrian surfaces, Standards Australia Disability (Access to Premises - Buildings) Standards 2010, Australian Government Work Health and Safety Act 2011 (NSW), NSW Legislation Strata Schemes Management Act 2015 (NSW), NSW Legislation Concrete Surface Profile (CSP) classifications, International Concrete Repair Institute (ICRI) Managing the risk of slips, trips and falls at work, Safe Work Australia