- CSMT here means ICRI's Concrete Slab Moisture Testing Technician-Grade 1 credential, built around ASTM floor-moisture test methods.
- Certification requires a written exam plus performing all five tests before a qualified judge, without coaching.
- Published 2026 full-course fees run USD 1,050 for ICRI members, USD 1,350 for non-members, and USD 510 for verified student members.
- Certification lasts five years; first recertification is written-exam-only, while later ones require the full course.
What CSMT Means Here
The acronym CSMT is shared by several unrelated credentials, so precision matters. In this article, and throughout CSMT Exam Prep, CSMT means Concrete Slab Moisture Testing Technician. The exact credential is the ICRI Concrete Slab Moisture Testing Technician-Grade 1, a hands-on field certification for people who measure moisture conditions in concrete floor slabs before flooring is installed.
If you have landed here looking for a different certification that happens to abbreviate the same way, this is not that one. Everything below concerns the concrete moisture testing credential only. For quick definitional pages on the acronym itself, see our short explainers on what CSMT stands for and the meaning of CSMT.
Who Issues the Credential
The certification is administered by the International Concrete Repair Institute (ICRI), an organization focused on the repair, restoration, and protection of concrete structures. ICRI runs the CSMT program as a combined education, demonstration, and testing experience, typically hosted at host sites and industry facilities. A 2026 session, for example, was scheduled for November 4-5, 2026 at a Structural Technologies location in the Baltimore, Maryland area.
The format is the first thing that sets this credential apart from a typical multiple-choice-only certification. You are not just answering questions; you are expected to physically perform field tests correctly while a qualified judge watches. For a fuller walkthrough of the credential's formal details, our CSMT certification overview and explainer on what CSMT certification is cover the framing from other angles.
Why Slab Moisture Testing Exists
Concrete slabs hold water long after they look and feel dry. When a moisture-sensitive floor covering such as resilient flooring, adhesive-applied finishes, or coatings is installed over a slab that is still releasing moisture or has an unsuitable surface chemistry, the result can be adhesive failure, bubbling, blistering, discoloration, or mold-related complaints. Those failures are expensive, and disputes over who is responsible often come down to one question: was the slab tested properly, and by someone who knew how?
That is the gap this credential fills. A certified technician is expected to choose and execute standardized test methods, record conditions accurately, and produce data that flooring manufacturers, contractors, and building owners can rely on.
The Five Test Methods You Must Master
The program's examination-reference and preparation topics fall under five headings, each tied to a specific ASTM standard. ICRI lists these as examination-reference and preparation topics, including applicable annexes and appendices. They are not a percentage-weighted or exhaustive blueprint, so do not read them as exam-section weightings. The examinations also cover the education session. Our complete guide to all five CSMT content areas goes deeper on each one.
Domain 1: ASTM F710 - Preparing Concrete Floors to Receive Resilient Flooring; Section 5.2 pH Testing
F710 is the practice for preparing concrete floors before resilient flooring goes down. The program's focus within it is Section 5.2, surface pH testing.
- Why alkalinity of the slab surface matters to adhesives and coverings
- How the pH test is performed and how results are read
- Candidates should use the edition supplied to registered candidates, not a newer edition substituted from elsewhere
Domain 2: ASTM F1869 - Measuring Moisture Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Chloride
The calcium chloride test measures how much moisture vapor leaves the slab surface over a set period.
- Kit preparation, placement, and exposure duration
- Weighing procedures and calculating the emission rate
- Ambient condition requirements during the test
Domain 3: ASTM F2170 - Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes
In situ probe testing measures relative humidity inside the slab rather than at the surface.
- Hole drilling, depth, and sleeve placement
- Equilibrium time before taking readings
- Probe handling and recording relative humidity and temperature
Domain 4: ASTM F2659 - Preliminary Evaluation of Comparative Moisture Condition of Concrete, Gypsum Cement and Other Floor Slabs and Screeds Using a Non-Destructive Electronic Moisture Meter
The electronic meter method is a quick, non-destructive screening tool, not a substitute for quantitative testing.
- What the meter does and does not tell you
- Using comparative readings to decide where to test further
- Limits of the method across different substrate types
Domain 5: ASTM F3191 - Field Determination of Substrate Water Absorption (Porosity) for Substrates to Receive Resilient Flooring
This method evaluates how readily the slab surface absorbs water, which affects bonding and preparation decisions.
- Performing the water absorption test in the field
- Interpreting results as an indicator of surface porosity
- Connecting porosity findings to surface preparation needs
A practical note on editions: the program directs candidates to use the standard editions supplied to registered candidates. Legacy study lists that include ASTM F2420 do not reflect the current program scope as described by ICRI, so do not build your preparation around them.
How Certification Works Step by Step
Eligibility
You qualify through one of two routes: ICRI-approved previous hands-on testing experience, or a prequalification waiver earned by participating in the Demonstration and Workshop. In other words, newcomers are not locked out, but they are expected to get supervised exposure to the methods. Details on prerequisites live in our CSMT requirements guide.
The Two Things You Must Pass
- The written examination, administered by ICRI.
- The performance component, in which you successfully perform all five tests before a qualified judge, without coaching.
The published schedule allocates one hour to the written examination and a separate, assigned one-hour performance appointment. The 3-4-hour education session is instructional and is not examination time, though the examinations do cover its content. A written question count and a numeric passing threshold were not verified in the sources reviewed, so we do not state them here. If you are hunting for scoring specifics, our passing score page explains what is and is not publicly confirmed.
Fees, Recertification, and Retakes
Initial Certification Fees
The published 2026 full-course fees include the education session and the demonstration/workshop:
| Participant Type | 2026 Full-Course Fee (USD) |
|---|---|
| ICRI member | 1,050 |
| Non-member | 1,350 |
| Verified student member | 510 |
For budgeting context beyond the course fee, see our CSMT certification cost breakdown.
Validity and Recertification
Certification lasts five years. Renewal is tiered:
| Stage | Requirement | Member Fee (USD) | Non-Member Fee (USD) |
|---|---|---|---|
| First recertification | Written exam only | 495 | 595 |
| Second and later recertifications | Full certification course | 695 | 895 |
One caution: ICRI's page includes a later-renewal heading referring to "10+ years after first recertification," which conflicts with the explicit five-year cycle stated elsewhere. That heading does not establish a ten-year certification validity, so plan around the five-year cycle and confirm timing directly with ICRI when your renewal approaches.
Retake Rules
- An initial failed written exam must be retaken in full.
- Failed performance methods alone are repeated, not the entire performance set.
- These retakes must occur within one year, or the full certification course must be repeated.
- A failed first-recertification written exam has a separate six-month re-examination deadline before the full course is required.
Key Takeaway
Do not confuse the separately sold online Education Course with the certification program. The online course does not lead to certification and cannot be credited toward it. If your goal is the credential, register for the certification program itself.
Wondering how scheduling works in practice? Our CSMT exam dates and scheduling page covers session timing, and our CSMT training overview explains how the education and workshop pieces fit together.
Who Uses a Certified Technician
The credential is aimed at people whose work puts them in contact with slab moisture decisions before floor coverings are installed. That typically includes:
- Flooring contractors and installers who need defensible test data before committing adhesive and covering to a slab
- Independent testing and inspection firms that perform moisture assessments for owners and general contractors
- Concrete repair and restoration companies, a natural fit given ICRI's focus
- Building owners and facility managers who want qualified third-party documentation when disputes arise
- Flooring manufacturers' technical and field-service staff who evaluate substrate conditions in warranty-related situations
We do not publish invented salary numbers for this niche. If you want to understand earnings context and role types, our CSMT jobs page and salary guide discuss what is and is not known, and our ROI analysis helps you weigh the fees above against your own career situation.
A CSMT-Specific Preparation Sequence
Because the credential tests both knowledge and demonstrated technique, sequence your preparation around the five methods rather than generic study blocks. The order below front-loads the methods with the most procedural detail.
Calcium chloride and pH foundations
- Work through ASTM F1869 setup, exposure, weighing, and emission-rate calculation
- Study F710 Section 5.2 pH testing and the reasoning behind it
In situ probe procedure
- Learn ASTM F2170 drilling, sleeve placement, equilibrium time, and reading procedures
- Practice describing each step aloud as you would perform it unprompted
Screening and porosity methods
- Review ASTM F2659 meter use and its limits as a preliminary tool
- Review ASTM F3191 water absorption procedure and interpretation
Integration and hands-on rehearsal
- Run all five methods start to finish without notes
- Revisit weak spots and take timed practice questions at the CSMT practice test site
For a broader plan, our CSMT study guide and one-page cheat sheet distill the must-know facts. If you are sizing up the effort involved, see how hard the CSMT exam is and what is known about pass rates. You can also try questions in the style of the written exam on the main practice test platform.
Frequently Asked Questions
It stands for Concrete Slab Moisture Testing Technician. The exact credential is the ICRI Concrete Slab Moisture Testing Technician-Grade 1, issued through the International Concrete Repair Institute.
Both are required. Certification requires passing the ICRI-administered written examination and successfully performing all five tests before a qualified judge without coaching.
Yes, through the prequalification waiver. Eligibility requires either ICRI-approved previous hands-on testing experience or participation in the Demonstration and Workshop, which provides the waiver.
Five years. First recertification is written-exam-only, while second and later recertifications require the full certification course. A heading on ICRI's page referencing ten or more years conflicts with this cycle and does not establish ten-year validity.
No. The separately sold online Education Course does not lead to certification and cannot be credited toward the certification program. You must register for the certification program itself to pursue the credential.