- What CSDR Certification Actually Is
- Clearing Up the Name: CSDR, CSDS and CRSD
- How the Exam Works
- The Seven Competency Statements
- The Reference Library Behind the Exam
- Who Qualifies and What You Must Document
- Costs, Renewal and the Two-Year Cycle
- Market Reality: A Small, Specialized Credential
- Sequencing Your Preparation
- Frequently Asked Questions
- CSDR means Council-certified Structural Drying Remediator, issued by the American Council for Accredited Certification (ACAC).
- The exam is 120 multiple-choice questions in three hours, closed book, with a 75% passing score.
- Initial cost is $500 ($100 exam plus $400 certification); renewal is $400 every two years.
- Eligibility requires either degree-plus-one-year or diploma-plus-two-years of documented structural drying experience, with four project sheets.
What CSDR Certification Actually Is
The Council-certified Structural Drying Remediator credential is a professional certification awarded by the American Council for Accredited Certification (ACAC) to practitioners who plan, execute and validate structural drying work after water intrusion. Unlike a weekend course certificate, it is an examination-and-experience credential: you must document real structural drying projects, pass a proctored exam, and then maintain the designation through recertification credits.
The CSDR is accredited by the Council of Engineering and Scientific Specialty Boards (CESB) at the engineering-technician level, which signals that the program is built around applied science rather than product familiarity. Candidates are expected to reason about moisture movement, vapor pressure, psychrometrics and equipment selection, not just recite equipment placement rules of thumb.
If you are searching for the shortest possible definition, our companion pages What Is CSDR? and What Does CSDR Stand For? cover the acronym itself. This article goes further and explains how the certification works end to end.
Clearing Up the Name: CSDR, CSDS and CRSD
Search results around this credential can be confusing, and the confusion is partly baked into the source material. The public CSDR candidate handbook section contains a preamble that refers to a Supervisor and a skills introduction and closing statement that refer to CSDS. Structural Drying Supervisor is the CSDS credential, a separate ACAC designation. The credential this site covers is the Remediator, CSDR, and the handbook's designation-use section confirms that name.
Also note that "CSDR" is an acronym shared by unrelated credentials in other industries. Always qualify your searches with "ACAC" or the full phrase "Council-certified Structural Drying Remediator" so you land on the right program.
| Designation | Meaning | Relevance to this article |
|---|---|---|
| CSDR | Council-certified Structural Drying Remediator | The credential covered here |
| CSDS | Structural Drying Supervisor | Separate ACAC credential; not interchangeable |
| CRSD | Not the CSDR credential | Do not substitute when searching or applying |
How the Exam Works
The CSDR examination consists of 120 multiple-choice questions with at least four answer choices each. You have three hours, the exam is closed book, and question and answer order is randomized for each candidate. The three-hour limit refers to the written examination only; it is not a measure of practical assessment or course hours.
Results are delivered immediately on screen and also by email. Testing is administered by Kryterion, Inc., either at an authorized testing center or through secure online video proctoring, so you can choose the setting where you are most comfortable.
- Passing score: 75%, established using the Modified Angoff Method, a standard-setting process in which subject-matter experts judge how a minimally competent candidate would perform on each question. See CSDR Passing Score 2026 for more on what that means for your target.
- Retakes: A retake costs $100.
- No state-licensing substitution: Passing an examination solely for state licensing does not confer the credential.
For a candid look at the difficulty side, including why a closed-book science-and-application exam differs from a memorization test, read How Hard Is the CSDR Exam?. For scheduling mechanics, see CSDR Exam Dates 2026.
The Seven Competency Statements
The CSDR section of the ACAC handbook lays out seven competency and preparation statements. It is important to read these correctly: they are unweighted source statements drawn from the handbook, not seven independent, officially weighted exam domains. The official examination-content chart linked from the handbook could not be retrieved at the time of our research, so no percentages are asserted here. Treat the list below as a map of what you must be able to do, and verify any weighting against ACAC directly.
1. ACAC Code of Conduct
A certificant understands and abides by the ACAC Code of Conduct. The Code of Conduct is also required reading, so expect ethics and professional-responsibility reasoning to matter.
2. Guidelines, Regulations and Standards
Understanding the guidelines, regulations and standards relevant to the structural drying industry. Published supporting topics include:
- The OSHA general duty clause
- Personal protective equipment (PPE)
- Emergency and fire plans
- Confined spaces and hazardous atmospheres or materials
- Walking and working surfaces, ladders, scaffolding and warnings
3. Principles, Strategies and Equipment in Project Design and Execution
Applying knowledge of principles, strategies and equipment to design and execute structural drying projects. This statement is the umbrella for the practical decisions a remediator makes on a job.
4. Psychrometry and Hygroscopic Materials
The basic principles of psychrometry and hygroscopic materials. Supporting topics include temperature, humidity, vapor pressure, heat, psychrometric charts, water phases, wood, equilibrium moisture content and cementitious materials.
5. Scientific Principles in Drying Strategy Design
Correctly applying scientific principles to design effective drying strategies. Supporting topics include Dalton's evaporation formula and the open, closed and combination drying strategies.
6. Equipment Selection and Operation
Selecting and operating appropriate drying equipment. Supporting topics include water-class-appropriate equipment, air movers, dehumidifiers, portable heating and cooling, HVAC and ductwork, and dehumidification formulas.
7. Phases of a Structural Drying Project
Designing and executing the phases of a structural drying project, including project planning, documentation, drying procedures, HVAC and microbial considerations, and drying validation.
Source caveat: The handbook's wording for this statement says "A CSDS correctly designs and executes the phases..." That reflects the handbook's own naming inconsistency inside the CSDR section. We preserve it with this explanation rather than silently importing anything from the separate CSDS section.
For a deeper walk through how these statements translate into study priorities, see CSDR Exam Domains 2026: Complete Guide to All 7 Content Areas.
The Reference Library Behind the Exam
The CSDR study guide organizes preparation around three reference sources. These are unweighted preparation categories, not a three-domain blueprint and not a guarantee of exhaustive exam coverage:
- ANSI/IICRC S500-2021 (fifth edition): The study guide specifies the entire S500 text, not selected excerpts.
- Larsen et al., Leadership in Restorative Drying, 4th edition (2014): Selected reading locations are designated.
- NIOSH, Respirator Selection Logic (2004): Selected reading locations are designated.
These are reference editions, not a numbered 2026 exam version. The reference books themselves are paid publications, so budget for them separately from the exam fees. For a structured approach to working through them, see the CSDR Study Guide 2026 and the compact CSDR Cheat Sheet.
Who Qualifies and What You Must Document
ACAC offers two eligibility routes, both of which hinge on documented structural drying experience:
| Route | Education | Documented experience |
|---|---|---|
| Degree route | A qualifying two-year postsecondary degree, or the equivalent of 15 credit hours, in engineering, science, architecture, industrial hygiene or a related scientific field | At least one year conducting structural drying projects |
| Experience route | High-school diploma or GED | At least two years of structural drying experience |
Regardless of route, the application package includes four project sheets, educational records where applicable, and employer or experience verification. The application then goes through review and certification-board approval. Preparatory training is not mandatory, so you are not required to buy a course to apply, though ACAC maintains a policy on independent preparation courses worth reading if you do consider one.
One logistical note: 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. Our CSDR Requirements 2026 page breaks the eligibility steps down further.
Costs, Renewal and the Two-Year Cycle
All figures are in US dollars and come from ACAC's published fee information:
- Examination fee: $100
- Certification fee: $400
- Total initial cost: $500
- Retake: $100
- Renewal: $400
Certification lasts two years. Current renewal procedures require 40 recertification credits, made up of 10 credits for continued field activity plus 30 professional-development hours. You must retain audit records and supply a required current photo. Keep your documentation organized from day one, since an audit can request supporting records. Full details are in CSDR Certification Cost 2026.
Market Reality: A Small, Specialized Credential
Be wary of any resource that promises a guaranteed salary bump or large job market for this certification. ACAC's Accredited Certification Activity report, dated December 31, 2025, records one current CSDR certification and no numerical 2025 pass ratio. A dash in that report must not be read as a zero-percent pass rate; it simply means no figure was published.
That tiny installed base tells you the credential is niche. It does not tell you keyword volume, revenue potential or pay. Structural drying work itself, performed by restoration contractors, mitigation firms and similar employers, is a real trade, but we do not assert a CSDR-specific pay premium or guaranteed demand. If you are weighing the investment, read the balanced discussions in CSDR Salary Guide 2026, Is the CSDR Certification Worth It? and CSDR Pass Rate 2026, and look at what employers in your region actually request. If you are exploring roles, our CSDR Jobs page is a starting point.
Third-party sites such as Docsity, StudyGuides.com, Stuvia and Certsarea list materials for this exam. A listing's visibility does not establish that questions are authentic, answers are accurate or the content is current. Treat any such material as unverified until you check it against the ACAC handbook and the S500 text.
Sequencing Your Preparation
Rather than a generic schedule, sequence your study by dependency: the science in the middle domains underpins the equipment and project-phase questions at the end. Here is one way to order the work, adjusted to your experience.
Foundations: Code of Conduct and safety regulations
- Read the ACAC Code of Conduct in full.
- Review OSHA general duty, PPE, confined spaces, hazardous atmospheres and working-surface topics, plus the NIOSH respirator selection reading.
Psychrometry and hygroscopic materials
- Work psychrometric chart problems by hand until reading humidity, vapor pressure and temperature relationships feels automatic.
- Study equilibrium moisture content in wood and the behavior of cementitious materials.
Strategy, equipment and project phases
- Apply Dalton's evaporation formula and compare open, closed and combination drying scenarios.
- Match equipment to water class; practice dehumidification formulas; review HVAC, planning, documentation and validation.
Because the exam is closed book, rehearse calculations without notes, and finish with timed sets of multiple-choice questions to build pacing for 120 questions in three hours. You can use the CSDR practice test to check your recall under timed conditions and find weak spots. Once you identify them, return to the S500 and the CSDR training resources for targeted review.
Frequently Asked Questions
It stands for Council-certified Structural Drying Remediator, a credential issued by the American Council for Accredited Certification (ACAC). It is not the same as CSDS, which designates a Structural Drying Supervisor. For more on the acronym, see What Is CSDR Certification? and CSDR Meaning.
The exam has 120 multiple-choice questions, a three-hour limit and a 75% passing score. It is closed book, and question and answer order is randomized. Results appear immediately and are also emailed.
The initial total is $500, made up of a $100 examination fee and a $400 certification fee. A retake is $100 and renewal is $400. Reference books are a separate expense.
No. Preparatory training is not mandatory. You do need to meet one of the two experience-based eligibility routes and submit four project sheets, educational records where applicable and employer or experience verification.
Two years. Renewal currently requires 40 recertification credits (10 for continued field activity and 30 professional-development hours), audit records and a current photo. Confirm the latest procedures with ACAC before your renewal window.
For the next step, explore our CSDR certification overview or head to the main practice test site to begin testing your readiness. Always verify current requirements, fees and deadlines directly with ACAC.