Concrete surface preparation methods differ in how they remove material, the surface profile they leave behind, and which coating or overlay systems they are suited to prepare for. Choosing the wrong method can mean a profile that is too shallow or too rough for the specified coating, while choosing the right one gives the coating a mechanical key to bond to. This guide is written for facility managers, property managers, general contractors, and building owners in Colorado who are scoping a flooring project and need to understand the options before a contractor walks the site. It covers diamond grinding, shot blasting, scarifying and other aggressive methods, and acid etching, and explains how these relate to the ICRI surface profile (CSP) system that manufacturers reference when specifying a coating.
Coating and primer manufacturers such as Sherwin-Williams, Tnemec, and Sika publish surface preparation requirements, typically including a target CSP, on their data sheets. Preparation methods exist to remove contaminants and weak surface material and, in most cases, to create a profile the coating can mechanically bond to. ASTM D4258 covers surface cleaning of concrete to remove grease, dirt, and loose material before coating, but it is not intended to alter the surface profile — it is a cleaning step, not a profiling step. ASTM D4259 covers abrasion methods used to create a surface profile and remove foreign material and weak laitance, intended for service conditions such as immersion, temperature cycling, or mechanical loading where strong bond is needed.
For a baseline on what these services include in Colorado, see the Colorado Concrete Surface Preparation contractor hub, and for budgeting, the Concrete Surface Preparation Cost in Colorado guide and the cost calculator can help frame expectations by service and city.
Diamond grinding uses rotating diamond-segmented discs to mechanically remove a thin layer of the concrete surface. Ask your contractor which grit sequence they plan to run and confirm the grinding plan's expected CSP against the coating manufacturer's data sheet target.
Shot blasting propels steel abrasive at the slab surface and recovers the media through a vacuum system, removing surface laitance and contaminants while creating a textured profile. At least one manufacturer data sheet specifies shot blasting ahead of a specific primer system. Sherwin-Williams' data sheet for Resuprime MVB calls for the surface to be shot blasted to an ICRI CSP 3-5, and specifically states that grinding or acid etching is not permitted for that product. This illustrates why the method itself — not just the resulting profile number — can be a manufacturer requirement rather than a contractor preference.
Some manufacturers require a specific method, not just a CSP number; for example Sherwin-Williams' Resuprime MVB sheet calls for shot blasting and does not permit grinding or acid etching. When a data sheet names shot blasting (or excludes grinding or acid etching), that instruction should be followed as written rather than substituted based on equipment availability.
Heavier-bodied products such as Tnemec 215 call for a minimum CSP 5; ask which method the contractor will use to reach the target. Tnemec's data sheet for its Series 215 Surfacing Epoxy, a 100% solids epoxy filler and surfacer, specifies a minimum ICRI CSP 5, a rougher profile than the minimum CSP 3 it specifies for its Series 201 Epoxoprime primer. Tnemec's Series 215 Surfacing Epoxy specifies a higher minimum CSP (5) than its Series 201 primer (3); the target profile is set per product. Tnemec's own guidance for its Series 208 Epoxoprime MVT cautions that over-aggressive blasting can create pinholes and prevent reaching the specified film thickness, with a target of CSP 3 for that product.
ASTM D4260 covers liquid and gelled acid etching intended to alter the concrete surface profile and remove foreign material and weak laitance, for service conditions where strong bond is desired. Some manufacturer data sheets, such as Sherwin-Williams' Resuprime MVB, do not permit acid etching; ASTM D4260 carries hazard statements in Section 6. Confirm with the manufacturer and contractor whether acid etching is excluded for your specified coating before allowing it as a prep option.
ICRI 310.2R is the guideline that summarizes the capabilities, operating requirements, and limitations of methods used to prepare concrete for sealers, coatings, polymer overlays, and concrete repair, and it includes benchmark CSP profiles used as visual standards for specification, application, and verification. The CSP scale in the current edition runs from CSP 1 (minimal roughness) through CSP 10 (very rough). Manufacturer requirements vary by product, not by a single industry rule:
| Product (per manufacturer data sheet) | CSP range specified |
|---|---|
| Sherwin-Williams Resuprime MVB | CSP 3-5 |
| Tnemec Series 208 Epoxoprime MVT | CSP 3-4 (target CSP 3) |
| Tnemec Series 201 Epoxoprime | minimum CSP 3 |
| Tnemec Series 215 Surfacing Epoxy | minimum CSP 5 |
| Sikafloor-264 | CSP 3-4 |
Sherwin-Williams' Form G-1 chart (page 3) also shows different CSP ranges across its own product families, from CSP 2-3 for some systems up to CSP 4-6 for others, which underscores that the profile target is set per product line rather than as a blanket rule. Beyond profile, several manufacturers also set a minimum concrete compressive or tensile strength as a precondition for coating: Sika requires a minimum of 3,625 psi (25 MPa) compressive strength at 28 days and 218 psi (1.5 MPa) in tension for Sikafloor-264, and Sherwin-Williams sets a 3,500 psi minimum compressive strength for its Resuprime MVB moisture-vapor product. These figures are product-specific and should not be assumed to apply to a different manufacturer's system. For related slab-condition issues such as moisture, see the Moisture Mitigation for Colorado Slabs guide; conditions on the day of install and the product data sheet govern what preparation and testing are required. Review coating options and facility fit at the Colorado Commercial Epoxy Flooring contractor hub, and compare installed cost ranges in the Commercial Epoxy Flooring Cost in Colorado guide.
Mechanical preparation generates dust; ask how dust will be contained and collected during preparation in occupied facilities. ASTM D7234 evaluates pull-off strength of an applied coating on concrete; for the strength of the prepared, uncoated surface, ASTM C1583 (and, as an adaptation, D7234 per 5.4) is used. ASTM C1583 covers determining the near-surface tensile strength of the substrate as an indicator of adequate surface preparation before a repair or overlay, the bond strength of a repair or overlay to the substrate, and the tensile strength of a repair or overlay material after application; it requires recording the failure mode and notes that results should be averaged only when the same failure mode occurs across tests. ICRI 210.3R covers a recommended method of evaluating the adequacy of concrete surface preparation and tensile bond strength of cementitious and polymer concrete surface repairs using the in-situ drilled core tensile pulloff test, including equipment, procedure, reporting, acceptance criteria, and failure modes.
The method should be driven by the coating or overlay manufacturer's data sheet, since different products specify different CSP targets and sometimes exclude certain methods outright. Ask the contractor to confirm the specified product's requirement in writing before work begins. Do not assume one method is correct without checking the product data sheet first.
ASTM D4260 covers liquid and gelled acid etching as a recognized practice for altering concrete surface profile before coating. However, some manufacturer data sheets specifically exclude acid etching for certain products, so the governing document is the coating manufacturer's data sheet for the product you are installing.
CSP stands for concrete surface profile and is defined on a numeric scale in ICRI 310.2R, which includes benchmark profiles used as visual standards for specification, application, and verification. Coating and primer manufacturers reference these CSP numbers in their own data sheets to specify the surface their product requires.
Not necessarily. Tnemec's data sheet for its Series 208 Epoxoprime MVT states that over-aggressive blasting can create pinholes and can prevent the coating from reaching its specified film thickness, with a target of CSP 3 for that product. The correct profile depends on the specific product, which is why the manufacturer's data sheet should always govern the target.
Before coating, the prepared surface's near-surface tensile strength can be checked per ASTM C1583; once a coating has cured per the manufacturer, its pull-off strength on concrete can be measured per ASTM D7234. ICRI 210.3R covers an in-situ drilled core tensile pulloff method for evaluating surface preparation adequacy and tensile bond strength of cementitious and polymer concrete surface repairs and bonded overlays. Your written scope should specify which test method will be used, how many locations will be tested, and how results will be reported.
Preparation methods and CSP targets are separate from a slab's moisture condition and compressive or tensile strength, which some manufacturers set as independent preconditions for their products. These requirements vary by manufacturer and product, so confirm both the moisture assessment and the strength requirement on the specific product's data sheet before work begins.
A specialty concrete surface preparation contractor can walk the site, review the coating manufacturer's requirements with you, and propose a method and verification plan suited to your facility. Request a written scope that itemizes the method, target CSP, and testing plan before signing a contract.
What concrete surface preparation costs per square foot in Colorado, how it scales by market, and why prep scope often decides the final coating price.
How concrete moisture is tested: in-situ RH probes, calcium chloride, and plastic sheet tests, what each reports, and when results are meaningful.
How coating prep differs on new concrete slabs and old ones: cure age, moisture, contamination, prior coatings, and what to test before specifying a system.
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