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APPLIED STRUCTURAL DRYING
TECHNICIAN CERTIFICATION (IICRC ASD)
PRACTICE EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
- What is the primary goal of applied structural drying? A. Replace all wet materials B. Sanitize all surfaces C. Return materials to pre-loss moisture condition D. Paint affected areas The objective of ASD is to restore materials to their pre-loss moisture content using controlled drying methods.
- Which psychrometric property measures the amount of moisture in the air compared to the maximum it can hold? A. Grains per pound B. Dew point C. Relative humidity D. Specific humidity Relative humidity expresses moisture in the air as a percentage of saturation at a given temperature.
- Increasing air temperature while keeping moisture constant will generally: A. Increase relative humidity B. Decrease relative humidity C. Increase condensation D. Have no effect
Warmer air can hold more moisture, so RH decreases if moisture content remains unchanged.
- The main purpose of air movers during drying is to: A. Reduce humidity B. Remove contaminants C. Increase evaporation rate D. Increase air pressure Air movers increase surface evaporation by moving saturated air away from wet materials.
- A refrigerant dehumidifier works best in which temperature range? A. Below 40°F B. 40–50°F C. Above 70°F D. Above 120°F Refrigerant dehumidifiers operate most efficiently in warm conditions, typically above 70°F.
- Desiccant dehumidifiers remove moisture primarily by: A. Cooling air B. Heating air C. Adsorption D. Condensation Desiccants attract and hold moisture through adsorption onto their surface.
- What unit measures moisture content in wood? A. GPP B. PSI C. Percent moisture content (%MC) D. Fahrenheit Wood moisture content is expressed as a percentage of the dry weight.
- Which instrument measures relative humidity and temperature? A. Moisture probe B. Thermo-hygrometer C. Manometer
D. Distilled water Category 3 water contains gross contamination and pathogens. 14.The first step in structural drying is: A. Apply antimicrobials B. Extract standing water C. Remove drywall D. Install dehumidifiers Extraction removes the largest amount of water quickly and efficiently. 15.GPP stands for: A. Gallons per pint B. Grains per pound C. Grams per pound D. Gallons per pressure Grains per pound measures humidity ratio in air. 16.One pound equals how many grains? A. 1000 B. 3500 C. 7000 D. 10, There are 7,000 grains in one pound, used in humidity calculations. 17.The dew point is the temperature at which: A. Water freezes B. Air becomes saturated and condensation forms C. RH drops D. Air pressure rises Dew point indicates when air reaches saturation and condensation occurs. 18.Class 4 water loss involves: A. Carpet only B. Ceiling tiles C. Low permeance materials like hardwood and plaster D. Concrete block only Class 4 materials require specialized drying due to low permeability.
19.Airflow should be directed: A. At ceiling only B. Across wet surfaces C. Outside building D. Into unaffected areas Air must move across surfaces to enhance evaporation. 20.An unaffected area should be: A. Heated B. Protected from moisture migration C. Ventilated D. Flooded Containment prevents spreading humidity to dry areas. 21.The ideal indoor drying RH target is typically: A. 80% B. 65% C. Below 40% D. 100% Lower RH accelerates evaporation and prevents microbial growth. 22.A moisture map is used to: A. Measure airflow B. Document affected areas and readings C. Track employees D. Record temperature only Moisture mapping tracks drying progress and documentation. 23.Air movers should typically be placed every: A. 5 feet B. 8 feet C. 10 – 16 feet D. 30 feet Standard spacing ensures proper airflow coverage. 24.Concrete dries primarily by: A. Dripping B. Evaporation
30.Psychrometrics is the study of: A. Mold B. Carpentry C. Air and moisture relationships D. Plumbing Psychrometrics analyzes temperature, humidity, and air properties. 31.The equilibrium moisture content (EMC) of a material is when: A. Material is fully saturated B. Material moisture content is balanced with surrounding air C. Material begins to decay D. RH reaches 100% EMC occurs when a material neither gains nor loses moisture because it is in balance with ambient conditions. 32.Negative pressure containment is used to: A. Increase drying speed B. Heat materials C. Prevent contamination spread D. Raise humidity Negative pressure prevents airborne contaminants from migrating to unaffected areas. 33.When monitoring a drying job, readings should be taken at least: A. Once a week B. Every hour C. Daily D. Once at start Daily monitoring ensures equipment adjustments and proper drying progress. 34.The primary safety hazard with wet environments and electricity is: A. Fire B. Mold C. Electrical shock D. Odor Water conducts electricity, increasing shock risk.
35.Injection drying systems are used primarily for: A. Carpet cleaning B. Wall cavity drying C. Painting D. Roofing Injection systems force air into wall cavities to accelerate drying. 36.The most important factor affecting evaporation rate is: A. Color of wall B. Vapor pressure differential C. Building age D. Carpet thickness Greater vapor pressure differences increase evaporation speed. 37.OSHA requires use of PPE when: A. Office work B. Exposure to hazards exists C. Driving only D. Monitoring humidity PPE is required when workers face potential health or safety hazards. 38.The purpose of demolition during drying is to: A. Increase cost B. Improve aesthetics C. Remove unsalvageable materials D. Reduce airflow Materials that cannot be dried must be removed to prevent damage. 39.Hardwood floors are often dried using: A. Only fans B. Specialized floor drying mats C. Paint sprayers D. Steamers Floor mat systems create suction or pressure to dry beneath flooring. 40.Air changes per hour (ACH) refers to: A. Temperature changes B. How often air volume is replaced in space
46.Thermal imaging cameras detect: A. Mold B. Moisture directly C. Temperature differences D. Vapor pressure Infrared cameras detect surface temperature variations, not moisture directly. 47.When drying a crawlspace, it is best to: A. Leave open vents B. Create a controlled environment C. Add water D. Ignore insulation Containment improves drying efficiency. 48.The main drying principle is: A. Add moisture B. Control humidity, airflow, and temperature C. Seal building permanently D. Cool structure Balanced control of environment speeds drying. 49.Secondary damage can be minimized by: A. Waiting B. Painting C. Rapid response and extraction D. Turning off fans Quick mitigation limits material deterioration. 50.Moisture meters should be calibrated: A. Never B. Once yearly only C. According to manufacturer instructions D. After every job Proper calibration ensures accurate readings. 51.Structural cavities dry faster when: A. Sealed tight
B. Airflow is introduced C. Painted D. Ignored Air circulation accelerates cavity drying. 52.Dehumidifiers remove moisture from: A. Materials directly B. Air C. Carpet only D. Walls only They reduce humidity, increasing evaporation potential. 53.The higher the temperature, the: A. Lower evaporation B. Greater moisture-holding capacity of air C. Higher RH automatically D. Less vapor pressure Warm air can hold more moisture. 54.A drying log should include: A. Employee birthdays B. Daily readings and equipment changes C. Paint color D. Customer hobbies Documentation tracks progress and supports claims. 55.Condensation occurs when: A. RH drops B. Surface temperature falls below dew point C. Temperature rises D. Air dries Condensation forms when surfaces reach dew point temperature. 56.HEPA filtration captures particles as small as: A. 10 microns B. 1 micron C. 0.3 microns
62.When drying plaster walls, expect: A. Rapid drying B. Extended drying times C. No monitoring D. Immediate demolition Plaster is low permeance and slow to dry. 63.Air movers should create airflow pattern known as: A. Random flow B. Circular only C. Laminar airflow across surfaces D. Upward draft only Laminar airflow maximizes surface evaporation. 64.Structural drying equipment should be inspected: A. Never B. Before each use C. Once per year D. After disposal Inspection ensures safety and performance. 65.When RH is lowered, evaporation rate: A. Decreases B. Stops C. Increases D. Reverses Lower RH increases vapor pressure differential. 66.A drying chamber is ineffective if: A. Doors closed B. Uncontrolled air exchange occurs C. Dehumidifiers used D. Air movers installed Uncontrolled exchange reduces drying efficiency. 67.Category 2 water contains: A. Pathogens B. Significant contamination
C. Clean drinking water D. Fuel Category 2 water may cause illness if contacted. 68.The drying process is complete when: A. Walls look dry B. Smell improves C. Moisture readings reach dry standard D. Equipment removed Verification is based on moisture measurement. 69.Safety Data Sheets (SDS) provide: A. Customer details B. Chemical hazard information C. Drying logs D. Blueprints SDS explain safe handling of chemicals. 70.Subfloor drying often requires: A. Painting B. Air injection or floor mat systems C. Ceiling fans D. Carpet removal only Special systems dry beneath flooring materials. 71.Increasing airflow without dehumidification may: A. Always work B. Redistribute moisture C. Lower RH D. Dry completely Without moisture removal, humidity may rise elsewhere. 72.Vapor diffusion moves moisture through: A. Air only B. Solid materials C. Pipes D. Wiring Diffusion is moisture movement through materials.
C. Air pressure D. RH only Moisture moves from wetter to drier sections internally. 79.Structural drying documentation supports: A. Decoration B. Insurance claims and liability protection C. Sales D. Marketing only Records provide legal and financial protection. 80.When outside air is more humid than inside, you should: A. Ventilate B. Keep structure closed C. Open windows D. Add fans Humid air increases drying time. 81.A moisture probe meter measures: A. Surface temp B. Internal moisture levels C. Airflow D. Pressure Probes penetrate materials for internal readings. 82.Rapid evaporation without dehumidification can cause: A. Faster drying B. High indoor humidity C. Lower RH D. No change Moisture must be removed from air. 83.The drying triangle consists of: A. Fire elements B. Heat, airflow, dehumidification C. Pressure only
D. Water only All three elements must be balanced. 84.A sealed drying chamber improves: A. Odor B. Energy efficiency C. Lighting D. Noise Containment prevents loss of conditioned air. 85.Water extraction tools include: A. Paint rollers B. Weighted extractors C. Brooms D. Drills Weighted extractors remove water from carpet and pad. 86.The wettest material in assembly dries: A. Last B. First internally but releases moisture outward C. Never D. Immediately Moisture equalizes before full drying. 87.Drying hardwood too quickly may cause: A. Mold B. Cupping or cracking C. Faster EMC D. None Rapid changes stress wood fibers. 88.A hygrometer measures: A. Airflow B. Humidity C. Pressure D. Voltage It measures RH and temperature.
C. Only at end D. After payment Clear communication ensures transparency. 95.Moisture migration can occur through: A. Steel only B. Capillary action C. Plastic D. Wiring only Capillary action draws moisture into porous materials. 96.Final documentation should include: A. Employee list B. All readings and drying verification C. Weather report only D. Paint brands Complete records verify job completion. 97.The primary reason to lower GPP is to: A. Increase cost B. Increase evaporation potential C. Reduce airflow D. Raise RH Lower humidity ratio increases drying rate. 98.A dry standard is established by: A. Guesswork B. Comparing to unaffected materials C. Insurance demand D. Contractor opinion Unaffected areas provide baseline moisture levels. 99.Controlled demolition may be required when: A. Materials are salvageable B. Materials cannot reach dry standard C. Customer objects D. Equipment fails Unsavable materials must be removed.
- The ultimate objective of ASD procedures is to: A. Increase profit B. Remove odors only C. Restore structural materials efficiently and safely D. Replace entire building ASD focuses on efficient, safe restoration to pre-loss condition.
