Illinois Home Inspector Practice Exam (IL-HI)
graded A+ 2026-2027
1. Which of the following is the primary purpose of a home inspection?
A. To identify visible and accessible defects in a property
Rationale: A home inspection is intended to assess the current condition of
visible and accessible systems and components, not to predict future problems
or guarantee code compliance.
2. What is the typical slope required for a residential roof to allow proper
drainage?
C. 2% (1/4 inch per foot)
Rationale: Proper roof drainage requires a minimum slope of approximately 2%
to prevent water accumulation and potential leaks.
3. Which system is responsible for removing wastewater from a house?
B. Plumbing system
Rationale: The plumbing system conveys wastewater to municipal sewer
systems or septic tanks.
4. What type of foundation is most common in Illinois residential
construction?
A. Concrete slab-on-grade
Rationale: Many Illinois homes are built on slab-on-grade foundations due to
soil conditions and cost-effectiveness.
5. What is the primary function of a GFCI (Ground Fault Circuit Interrupter)?
D. To protect people from electric shock
Rationale: GFCIs detect differences in current and quickly shut off power to
prevent electrocution.
,6. Which of the following is a common cause of basement water intrusion in
Illinois homes?
C. Improper grading around the foundation
Rationale: Water tends to flow toward low areas; improper grading can cause
water to accumulate against the foundation.
7. During an inspection, the presence of mold is usually identified by:
B. Visual signs and odor
Rationale: Home inspectors identify potential mold issues through visible
growth, stains, or musty odors; testing is usually beyond standard inspections.
8. What is the standard height for a residential guardrail?
C. 36 inches
Rationale: Building codes generally require guardrails to be at least 36 inches in
height to prevent falls.
9. Which type of insulation is commonly found in older Illinois homes?
B. Fiberglass batts
Rationale: Fiberglass batt insulation has been widely used in wall cavities and
attics for decades.
10. What is a common sign of a failing water heater?
D. Rusty water and frequent leaks
Rationale: Rust, leaks, or unusual noises can indicate corrosion or sediment
buildup affecting water heater performance.
11. What is the minimum clearance required between the ground and the
bottom of wooden deck posts?
, B. 6 inches
Rationale: Maintaining 6 inches reduces moisture contact and potential wood
rot.
12. Which roof covering material is most prone to ice dam formation in cold
climates like Illinois?
A. Asphalt shingles
Rationale: Asphalt shingles can allow ice dams to form if the attic is not
properly insulated or ventilated.
13. What is the purpose of a vent stack in plumbing?
C. To allow air into the drainage system and prevent siphoning
Rationale: Vent stacks maintain proper air pressure in drains and prevent traps
from being emptied.
14. Which electrical component prevents overloads in circuits?
B. Circuit breaker
Rationale: Circuit breakers trip when current exceeds safe levels, protecting
wiring and appliances.
15. What is the main function of flashing around roof penetrations?
D. To prevent water intrusion
Rationale: Flashing directs water away from joints and openings, reducing
leaks.
16. A common defect in older windows is:
C. Rotting wooden frames
Rationale: Wooden frames deteriorate over time if not properly maintained or
sealed.
graded A+ 2026-2027
1. Which of the following is the primary purpose of a home inspection?
A. To identify visible and accessible defects in a property
Rationale: A home inspection is intended to assess the current condition of
visible and accessible systems and components, not to predict future problems
or guarantee code compliance.
2. What is the typical slope required for a residential roof to allow proper
drainage?
C. 2% (1/4 inch per foot)
Rationale: Proper roof drainage requires a minimum slope of approximately 2%
to prevent water accumulation and potential leaks.
3. Which system is responsible for removing wastewater from a house?
B. Plumbing system
Rationale: The plumbing system conveys wastewater to municipal sewer
systems or septic tanks.
4. What type of foundation is most common in Illinois residential
construction?
A. Concrete slab-on-grade
Rationale: Many Illinois homes are built on slab-on-grade foundations due to
soil conditions and cost-effectiveness.
5. What is the primary function of a GFCI (Ground Fault Circuit Interrupter)?
D. To protect people from electric shock
Rationale: GFCIs detect differences in current and quickly shut off power to
prevent electrocution.
,6. Which of the following is a common cause of basement water intrusion in
Illinois homes?
C. Improper grading around the foundation
Rationale: Water tends to flow toward low areas; improper grading can cause
water to accumulate against the foundation.
7. During an inspection, the presence of mold is usually identified by:
B. Visual signs and odor
Rationale: Home inspectors identify potential mold issues through visible
growth, stains, or musty odors; testing is usually beyond standard inspections.
8. What is the standard height for a residential guardrail?
C. 36 inches
Rationale: Building codes generally require guardrails to be at least 36 inches in
height to prevent falls.
9. Which type of insulation is commonly found in older Illinois homes?
B. Fiberglass batts
Rationale: Fiberglass batt insulation has been widely used in wall cavities and
attics for decades.
10. What is a common sign of a failing water heater?
D. Rusty water and frequent leaks
Rationale: Rust, leaks, or unusual noises can indicate corrosion or sediment
buildup affecting water heater performance.
11. What is the minimum clearance required between the ground and the
bottom of wooden deck posts?
, B. 6 inches
Rationale: Maintaining 6 inches reduces moisture contact and potential wood
rot.
12. Which roof covering material is most prone to ice dam formation in cold
climates like Illinois?
A. Asphalt shingles
Rationale: Asphalt shingles can allow ice dams to form if the attic is not
properly insulated or ventilated.
13. What is the purpose of a vent stack in plumbing?
C. To allow air into the drainage system and prevent siphoning
Rationale: Vent stacks maintain proper air pressure in drains and prevent traps
from being emptied.
14. Which electrical component prevents overloads in circuits?
B. Circuit breaker
Rationale: Circuit breakers trip when current exceeds safe levels, protecting
wiring and appliances.
15. What is the main function of flashing around roof penetrations?
D. To prevent water intrusion
Rationale: Flashing directs water away from joints and openings, reducing
leaks.
16. A common defect in older windows is:
C. Rotting wooden frames
Rationale: Wooden frames deteriorate over time if not properly maintained or
sealed.
