INTERNACHI Cheat Sheet 2026

The 30 highest-yield INTERNACHI facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. How does moisture affect structural components? → It causes deterioration and damage
2. What is a common plumbing issue in homes? → Pipe leaks
3. Which component of a wood-burning stove installation does an inspector evaluate for safe clearance to combustibles? → The stovepipe, stove body, and floor protector clearances per manufacturer and code
4. What is the role of structural engineers in home inspections? → To inspect and design structural components
5. What is the role of a licensed electrician in home inspections? → To assess and repair electrical systems
6. Why is a home inspection report important for buyers and sellers? → It helps buyers and sellers make informed decisions
7. What safety precaution should be taken when inspecting electrical systems? → Using insulated tools and safety equipment
8. According to the International Residential Code (IRC), which of the following situations requires the installation of safety glazing? → Glazing in a swinging door that separates a bedroom from a hallway.
9. What does a deteriorating or missing chimney crown typically cause? → Water intrusion into the chimney structure and surrounding masonry
10. Creosote found in a chimney flue is a byproduct of: → Incomplete combustion of wood in a fireplace or stove
11. According to InterNACHI standards, which component on a chimney directs water away from the junction of the chimney and a sloped roof? → Saddle (cricket)
12. Which of the following is an inspector REQUIRED to inspect according to the InterNACHI Exterior Standards of Practice? → Retaining walls that may adversely affect the structure.
13. Which of the following is a common electrical issue found during home inspections? → Overloaded circuits
14. What is the hearth extension requirement for a fireplace with an opening greater than 6 square feet? → Extends at least 20 inches in front of and 12 inches beyond each side of the opening
15. A chimney cap serves which of the following primary functions? → Preventing rain, debris, and animals from entering the flue
16. What is the function of the smoke shelf inside a masonry fireplace? → To catch falling debris and prevent downdrafts from pushing smoke into the room
17. Spalling observed on a masonry chimney exterior refers to: → Flaking or breaking off of the face of brick or stone surfaces
18. What is the purpose of a chase cover on a factory-built or prefabricated chimney? → To cap and weatherproof the framed chimney chase surrounding the metal flue pipe
19. What is an HVAC system responsible for? → Heating, cooling, and air quality management
20. Which of the following is the most common cause for 'nail pops' appearing on interior drywall surfaces, especially in newer construction? → Shrinkage of the wood framing members as they dry out.
21. How does a home inspector evaluate the condition of the roof? → By using binoculars or a drone if needed
22. Why is it important to inspect plumbing and HVAC systems? → To ensure systems are functioning efficiently and safely
23. What is the primary function of a structural system in a building? → To support the building's weight and resist forces
24. In a cold climate like North Dakota, where should the vapor retarder (e.g., kraft paper facing on insulation) be placed in an exterior wall assembly? → On the interior side of the insulation, directly behind the drywall.
25. Why is grounding important in electrical systems? → To protect against electrical shock and fire hazards
26. Which of the following is NOT part of the structural system of a building? → Electrical wiring
27. Third-degree creosote in a chimney flue is classified as: → Hardened, glazed tar that is highly concentrated and difficult to remove
28. Which of the following components are part of a plumbing system? → Pipes, faucets, and drainage systems
29. What is the primary function of a plumbing system in a building? → To distribute clean water and remove waste
30. Efflorescence on a chimney indicates: → Water is moving through the masonry and depositing minerals on the surface