- What This Credential Actually Is (and Is Not)
- The Two Eligibility Routes
- Four Project Sheets and the Documentation Package
- Application Review, Approval and Deadlines
- What You Qualify to Sit: Exam Format and Fees
- The Content Behind the Requirements
- Naming Traps: CSDR, CSDS, CRSD and IICRC ASD
- Staying Certified After You Qualify
- A Requirements-First Readiness Plan
- Frequently Asked Questions
- Two routes qualify you: a two-year technical degree (or 15 credits) plus one year of drying work, or a diploma/GED plus two years.
- Every applicant submits four project sheets plus employer or experience verification; degree-route applicants also submit educational records.
- Preparatory training is not mandatory; the credential rests on documented experience and a 120-question, three-hour exam.
- Initial cost is $500 ($100 exam plus $400 certification); retakes are $100 and renewal is $400.
What This Credential Actually Is (and Is Not)
The Council-certified Structural Drying Remediator is issued by the American Council for Accredited Certification (ACAC). It is a experience-gated, exam-verified credential for people who plan and carry out structural drying projects. It is not an entry-level course completion certificate, and it is not a state license. Passing an examination taken solely for state licensing does not confer the credential, so a licensing exam alone will never substitute for the ACAC process.
The credential is CESB-accredited at the engineering-technician level, which tells you something about its intended positioning: practical, science-literate field work rather than purely administrative supervision. If you are new to the name, start with What Is CSDR Certification? for the plain-language overview, then return here for the qualification mechanics.
The Two Eligibility Routes
ACAC defines eligibility as a combination of education and documented structural drying experience. There are two pathways, and you only need to satisfy one.
| Element | Route 1: Education-Plus-Experience | Route 2: Experience-Heavy |
|---|---|---|
| Education | A qualifying two-year postsecondary degree, or the equivalent of 15 credit hours, in engineering, science, architecture, industrial hygiene or a related scientific field | High-school diploma or GED |
| Documented experience | At least one year conducting structural drying projects | At least two years of structural drying experience |
| Educational records | Required, because the degree or credits are the basis for the shortened experience requirement | Not the basis of eligibility |
| Project sheets | Four | Four |
| Employer/experience verification | Required | Required |
Reading Route 1 carefully
Notice that the education need not be a full degree. The 15-credit-hour equivalent is a meaningful door for technicians who took science or engineering coursework without finishing a degree. The subject areas named are engineering, science, architecture, industrial hygiene or a related scientific field. If your coursework sits at the edge of those categories (for example, building-science or environmental-health classes), do not guess. Ask ACAC whether it counts before you build your plan around it.
Reading Route 2 carefully
The diploma-or-GED route trades education for time: two documented years rather than one. "Documented" is the operative word. Experience that you cannot verify with an employer or other credible source does not help you, no matter how many jobs you have worked. If you have been self-employed, think now about how you will substantiate your project history through client records, invoices, job files or a qualified third-party verifier.
What counts as experience
The requirement is conducting structural drying projects, not simply being present on a restoration crew. Ask yourself whether you can describe, in your own words, how a particular job was assessed, how drying equipment was selected and placed, how conditions were monitored and how completion was validated. Those are the same activities the exam probes, so the experience requirement and the content requirement reinforce each other.
Four Project Sheets and the Documentation Package
Every applicant, regardless of route, submits four project sheets. Think of these as structured case summaries of drying jobs you personally handled. They are the single best preview of what ACAC expects you to be able to do, so choose them deliberately.
Choosing Your Four Project Sheets
Select projects that show breadth and sound technical judgment, not just the largest jobs.
- Pick jobs where you can speak to documentation, drying procedures and how completion was validated.
- Favor variety where your record allows it, such as different materials, water situations or strategy choices.
- Choose jobs for which you still hold readings, equipment logs and photos, since vague recollection weakens a sheet.
- Avoid jobs where another person made all the technical decisions and you only supplied labor.
The full document checklist
- Four project sheets documenting structural drying projects you conducted.
- Educational records when you are applying under the degree-or-credits route.
- Employer or experience verification confirming your time in the field.
- The application itself, submitted through ACAC's structural drying application process.
The official application page is the authoritative place to confirm the current forms and instructions. Treat any third-party summary, including this one, as orientation rather than the final word.
Application Review, Approval and Deadlines
After submission, ACAC reviews your application, and the certification board approves it. Only then do you proceed to the exam. The sequence is application, review, board approval, exam, certification. Because review takes time, plan your timeline backward from when you want to be certified rather than forward from when you feel ready to study.
The deadline ambiguity you must resolve
Here is a genuine inconsistency worth flagging. The current online application allows six months, while the candidate handbook retains older wording referring to 90 days and a notarized paper process. These do not agree. The safest course is to follow the current application instructions on the ACAC site and confirm the operative deadline directly with ACAC before you begin, rather than relying on any single document. For scheduling specifics once you are approved, see CSDR Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Preparatory training is optional
Importantly, ACAC does not require you to complete any preparatory training to qualify. That does not mean preparation is optional in practice; it means no particular course is a prerequisite. If you choose a course, check ACAC's independent preparation-course policy so you understand how outside providers relate to the certifying body. For a discussion of training options and what to look for, see CSDR Training.
What You Qualify to Sit: Exam Format and Fees
Meeting the requirements earns you the right to take a closed-book exam delivered through Kryterion, Inc., either at an authorized testing center or through secure online video proctoring.
| Item | Detail |
|---|---|
| Questions | 120 multiple-choice, each with at least four answer choices |
| Time limit | Three hours (written exam duration) |
| Reference materials | None; closed book |
| Passing score | 75%, set using the Modified Angoff Method |
| Question order | Question and answer order randomized |
| Results | Immediate electronic results plus an emailed copy |
| Testing provider | Kryterion, Inc. |
The three-hour limit applies to the written exam only. It is not a measure of practical-assessment time or course hours. For more on how the 75% line is set and what it implies for your preparation, see CSDR Passing Score 2026: Exactly What You Need to Pass.
The money side of qualifying
| Fee | Amount (USD) |
|---|---|
| Examination fee | $100 |
| Certification fee | $400 |
| Total initial cost | $500 |
| Retake | $100 |
| Renewal | $400 |
The full breakdown, including how to think about the cost against your career, is in CSDR Certification Cost 2026: Complete Pricing Breakdown. Confirm current amounts on ACAC's fees page before you pay, since fee schedules can change.
The Content Behind the Requirements
Qualifying on paper is only half the picture. The exam tests whether your documented experience translates into command of the underlying science and standards. ACAC's candidate handbook prints seven competency and preparation statements for this credential. They are unweighted source statements rather than a published percentage blueprint, so do not read the order or count as a weighting scheme. For a deeper walkthrough, see CSDR Exam Domains 2026: Complete Guide to All 7 Content Areas.
Domain 1: The ACAC Code of Conduct
A certificant understands and abides by the ACAC Code of Conduct. The Code of Conduct is required reading, and it is the one domain every candidate can fully prepare for from a single short document. Do not skip it because it feels non-technical.
Domain 2: Guidelines, Regulations and Standards
Candidates must understand the guidelines, regulations and standards relevant to the structural drying industry. Published supporting topics include:
- The OSHA general duty clause
- Personal protective equipment
- Emergency and fire plans
- Confined spaces and hazardous atmospheres or materials
- Walking and working surfaces, plus ladders, scaffolding and warnings
Domain 3: Principles, Strategies and Equipment
A certificant applies knowledge of principles, strategies and equipment to the design and execution of structural drying projects. This is where your field experience pays off most directly, because it covers the judgment calls you make on real jobs.
Domain 4: Psychrometry and Hygroscopic Materials
Candidates must understand the basic principles of psychrometry and hygroscopic materials. Published supporting topics include:
- Temperature, humidity, vapor pressure and heat
- Psychrometric charts and the phases of water
- Wood, equilibrium moisture content and cementitious materials
Domain 5: Applying Scientific Principles to Drying Strategy
The certificant correctly applies scientific principles in designing effective drying strategies. Published supporting topics include Dalton's evaporation formula and the distinctions among open, closed and combination drying strategies.
Domain 6: Selecting and Operating Equipment
The certificant selects and operates appropriate drying equipment. Published supporting topics include:
- Water-class-appropriate equipment selection
- Air movers and dehumidifiers
- Portable heating and cooling
- HVAC and ductwork considerations
- Dehumidification formulas
Domain 7: Phases of a Structural Drying Project
This statement concerns correctly designing and executing the phases of a structural drying project. A source quirk deserves mention: the handbook's wording for this item says "CSDS" even though it sits in the CSDR section, and elsewhere the preamble refers to a Supervisor. We treat this as a naming inconsistency in the source, not a reason to borrow requirements from the separate Supervisor credential. Published supporting topics include project planning, documentation, drying procedures, HVAC and microbial considerations, and drying validation.
The reference library
The study guide organizes preparation around three references, presented as unweighted categories rather than a three-domain blueprint:
- IICRC, ANSI/IICRC S500-2021 (fifth edition)
- Larsen, et al., Leadership in Restorative Drying, 4th edition (2014)
- NIOSH, Respirator Selection Logic (2004)
The guide calls for the entire S500 text and identifies selected reading locations in the Larsen and NIOSH works. It also warns against limiting study to highlighted material. These are reference editions, not a numbered 2026 exam version. Because the paid reference books were not part of our review, verify exactly what is assigned directly from the handbook. For the study sequence we recommend, see CSDR Study Guide 2026: How to Pass on Your First Attempt.
Naming Traps: CSDR, CSDS, CRSD and IICRC ASD
Because several similar acronyms circulate in the restoration world, candidates frequently apply for, study for or search for the wrong thing. Keep these straight:
- CSDR is the Council-certified Structural Drying Remediator, the credential this site covers.
- CSDS is the Structural Drying Supervisor, a separate ACAC credential with its own eligibility. Do not apply CSDS eligibility rules to a CSDR application.
- CRSD is a different acronym and not a substitute for either.
- IICRC ASD is an IICRC credential, not an ACAC one, with its own pathway.
When you search for study materials, qualify the acronym with ACAC or the full credential name. Plain "CSDR" searches can surface unrelated certifications that share the same letters. For the broader naming picture, see What Does CSDR Stand For?
Staying Certified After You Qualify
Qualification is not permanent. Certification lasts two years. Current renewal procedures call for 40 recertification credits, made up of 10 for continued field activity plus 30 professional-development hours. Renewal also involves audit records and the required current photo, and the renewal fee is $400.
The practical implication for requirements planning is that the documentation habits you build during qualification carry forward. Keep records of both your field activity and your professional development from day one, so recertification is a matter of assembling what you already have. Check ACAC's recertification procedures page for the current rules before each cycle.
A Requirements-First Readiness Plan
Generic study advice matters less here than sequencing your work around the application process. This short plan ties each phase to a specific requirement and exam domain.
Eligibility and Records
- Determine which route you qualify under and confirm any borderline coursework with ACAC.
- Request educational records and line up your employer or experience verifier.
- Shortlist the four projects you will document.
Application and Foundations
- Submit the application and confirm the operative deadline.
- While you wait for review, read the ACAC Code of Conduct (Domain 1) and the safety and regulatory material (Domain 2).
Science Core
- Work through psychrometry, vapor pressure, equilibrium moisture content and Dalton's evaporation formula (Domains 4 and 5).
- Practice reading a psychrometric chart until it is automatic.
Equipment, Phases and Practice
- Review equipment selection, HVAC considerations and project validation (Domains 3, 6 and 7).
- Take timed practice sets in the closed-book, 120-question format.
When you are ready to test yourself against realistic question styles, use the CSDR practice test on our main site. Because this exam is closed book with randomized answer order, practicing without notes matters. Our CSDR Cheat Sheet 2026: One-Page Review of Must-Know Facts is a good last-week refresher, and How Hard Is the CSDR Exam? Complete Difficulty Guide 2026 helps you calibrate your expectations.
Key Takeaway
Treat your four project sheets as both an application requirement and a study tool. If you cannot explain the psychrometric reasoning, equipment choices and validation steps for each documented job, that is precisely the knowledge gap the exam will expose.
Frequently Asked Questions
No. You can qualify with a high-school diploma or GED plus at least two documented years of structural drying experience. A qualifying two-year postsecondary degree, or the equivalent of 15 credit hours in engineering, science, architecture, industrial hygiene or a related scientific field, shortens the experience requirement to one documented year.
No. Preparatory training is not mandatory. The requirements are documented education and experience, four project sheets, verification, application review and certification-board approval. Courses can help you prepare, but none is a prerequisite.
Four, under either eligibility route. They document structural drying projects you conducted, and they accompany your employer or experience verification and, where applicable, your educational records.
Sources disagree. The current online application allows six months, while the handbook retains 90-day and notarized-paper wording. Follow the current application instructions and confirm the operative deadline with ACAC before you start.
No. Passing an examination solely for state licensing does not confer the Council-certified Structural Drying Remediator credential. You must complete the ACAC application, approval and examination process.
Meeting the requirements is a documentation exercise as much as a knowledge exercise. Confirm your route, assemble your four project sheets, verify the deadline with ACAC and then build your preparation around the seven published competency statements. For ongoing questions about what the credential can do for your career, see Is the CSDR Certification Worth It? Complete ROI Analysis 2026.