Concrete Surface Profile (CSP) is the ICRI reference scale used to describe the texture of a prepared concrete surface. The scale runs from CSP 1 through CSP 10, from the least textured to the most aggressive profile. It gives specifiers, contractors, and inspectors a shared visual and tactile reference, but it does not replace the coating or repair-material manufacturer's preparation requirements.
Quick answer: how should a contractor use CSP 1–10?
Start with the system being installed, confirm the substrate is sound, and follow the written specification and current product data. Select a preparation method that can produce the required profile under the actual jobsite conditions, then compare the finished surface with ICRI CSP replica chips and complete any other required quality-control tests. A higher CSP number is not automatically better; the correct profile is the one specified for the selected system.
What is Concrete Surface Profile?
ICRI 310.2R, Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, Polymer Overlays, and Concrete Repair, uses CSP replica chips to create a common reference for surface roughness. ICRI's current chip set contains ten profiles, including the more aggressive tenth profile used for concrete repair.
CSP describes texture. It does not, by itself, prove that the concrete is dry, clean, uncontaminated, structurally sound, or ready for a particular product. Moisture, laitance, curing compounds, oil, old coatings, dust, weak concrete, and other bond breakers still require separate evaluation.
Why surface preparation matters
Protective systems and repair materials rely on the prepared substrate for adhesion and load transfer. A surface can look rough yet remain unsuitable because it contains dust or unsound concrete. Conversely, excessive removal can damage the substrate or create a profile that is too aggressive for a thin system.
ACI's guidance on protection systems likewise treats assessment and surface preparation as part of selecting and applying a system, not as a cosmetic step after product selection. The practical lesson is simple: specify the outcome, not just the tool.
Concrete surface preparation selection table
| Decision | What to confirm | Why it matters |
|---|---|---|
| System requirements | Required CSP, cleanliness, moisture condition, surface strength, and test methods in the current specification and product data | The installed material determines the acceptable substrate condition |
| Existing concrete | Soundness, cracks, contamination, laitance, prior coatings, reinforcement exposure, and repair needs | Profiling cannot correct an unresolved substrate defect |
| Preparation method | Access, edges, dust or water controls, noise, production rate, and the profile the equipment can consistently produce | The same method can produce different results on different concrete |
| Verification | CSP comparison plus any specified cleanliness, moisture, pull-off, or other acceptance testing | Visual roughness alone does not verify every acceptance criterion |
A four-step contractor workflow
- Evaluate: document substrate condition, contaminants, moisture, soundness, access, and jobsite restrictions.
- Review: read the project specification and the current technical data for the sealer, coating, overlay, or repair material.
- Select: choose equipment and controls capable of reaching the required profile without unnecessarily damaging sound concrete.
- Specify and verify: record the target CSP, edge details, cleanup procedure, and required quality-control tests before work begins.
Common preparation methods
- Grinding can remove high spots, residues, and thin surface material, but the result depends on the tooling, machine, passes, and concrete.
- Shot blasting is commonly used on open horizontal areas where a controlled, repeatable profile is required.
- Scarifying or milling removes more material and can leave ridges that require evaluation or follow-up preparation.
- Water jetting or hydrodemolition can remove concrete without dry abrasive dust, but water management, runoff, reinforcement, and the required post-preparation moisture condition must be planned.
Do not assign a guaranteed CSP number to a method without a trial area and verification. Equipment condition, operator technique, aggregate, paste hardness, previous treatments, and access all affect the finished profile.
Safety planning for concrete preparation
Grinding, drilling, cutting, and abrasive work on concrete can create respirable crystalline silica. OSHA's construction standard requires covered employers to control exposure and take additional protective steps. Use the applicable OSHA control method or exposure assessment, follow the equipment instructions, and include dust or water control, housekeeping, access restrictions, training, and personal protective equipment in the work plan.
How CSP relates to crack injection
CSP is mainly a surface-preparation reference; crack injection delivers material into a crack or internal path. Before choosing equipment, first decide whether the condition calls for a surface treatment or injection based on crack activity, movement, moisture, and the repair objective.
When injection is selected, the visible surface may still need cleaning for inspection, marking, drilling, or a temporary surface seal. Port type also changes the preparation sequence: compare mechanical injection packers and bonded surface ports before writing the field procedure.
Related injection equipment
For a complete workflow, review the exact resin, pump, hose, coupler, port, and cleanup requirements together. ACST's injection pump collection and mechanical injection packer collection are starting points for equipment selection. Confirm compatibility and working limits from the current product and material documentation before use.
Frequently asked questions
Is a higher CSP number always better?
No. A profile that is too aggressive can be unsuitable for a thin coating or can require unnecessary removal. Use the profile specified for the selected system and substrate.
Does a preparation method guarantee a CSP?
No. The same method can create different profiles depending on the concrete, tooling, equipment condition, and operator technique. Prepare a representative trial area and verify the result.
Do CSP chips prove the surface is ready?
They help compare texture. They do not establish cleanliness, moisture condition, tensile strength, contamination, or repair suitability. Complete every acceptance check required by the specification and product manufacturer.
Should surface preparation be selected before the repair material?
Usually no. Evaluate the concrete and repair objective first, select the compatible system, then choose a preparation method that can achieve that system's requirements.
Technical references
- ICRI: Concrete Surface Profile chip set and 310.2R reference
- ACI 515.3R-20 preview: assessment and surface preparation for protection systems
- OSHA: Respirable crystalline silica in construction
Conclusion
CSP makes concrete surface texture easier to specify and inspect, but the number is only one part of acceptance. Begin with the substrate and installed system, follow current project and manufacturer requirements, prepare a representative trial area, and verify every specified condition before application.
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