How to Inspect the Attic, Insulation, Ventilation and Interior Course

Welcome to InterNACHI's free, online How to Inspect the Attic, Insulation, Ventilation and Interior course. 
Take the free, online course now.
The goal of this course is to teach students how to perform an inspection of the attic, insulation, and interior of a residential property.
Upon successful completion of this course, the student will be able to:
  • inspect the attic, insulation, ventilation and interior systems and related components;
  • identify and describe each system and related components of the attic, insulation, ventilation, and interior; and
  • describe to clients defects observed at those systems and components.
This course is free to all InterNACHI members and can be taken again and again, without limit.
The course includes:
  • 41,851 words;
  • 50 photos, graphics, and diagrams;
  • online writing essay assignments;
  • inspection report writing assignments;
  • required additional reading;
  • 80 quiz questions in 12 quizzes;
  • a 60-question final exam (drawn from a larger pool);
  • instant grading;
  • a downloadable, printable Certificate of Completion; and 
  • accreditations and state approvals.


How to Inspect the Attic, Insulation, Ventilation, and Interior Course

Course # 3700



Estimated hours for the average student

Academic Engagement

Reading and studying online course instructional material at 140 words per minute


Taking quizzes


Taking exam


Performing a self-guided assigned research exercise


Submitting an academic written essay assignment and applicable digital image and contributing to an academic online discussion





Studying & reviewing instructional material in preparation for taking quizzes and exam


Homework of reading, studying, and note-taking from the downloaded student study guidebook at 140 words per minute


Homework of preparing to perform an the assigned inspection activity, taking inspection images, developing observations and opinions, and writing assigned essays




Sub Total


Overall Total


Reminder to members:  InterNACHI's Code of Ethics 1.10 requires that you comply with all government rules and licensing requirements of the jurisdiction where you conduct business.  InterNACHI's courses and Standards generally exceed the Standards of Practice that you are required to abide by locally. 
This course has been approved by:

The course covers the following categories:
    • Inspector Safety Equipment and Inspection Tools           
    • InterNACHI Standards of Practice           
    • General Inspection Comments           
    • Heat Movement           
    • Moisture Movement           
    • Moisture Can Be a Problem           
    • Four Things Your Client Can Do           
    • Protection From Water Damage           
    • Introduction to Insulation           
    • R-Value of Insulation           
    • Compressed Insulation           
    • Thermal Bridging           
    • Inspecting the Insulation           
    • Precautions About Adding Insulation           
    • Check the Attic           
    • Attic Access           
    • Attic Pull-Down Stairs           
    • Attic Insulation Rulers and Thicknesses           
    • Difficult Areas to Check in the Attic           
    • Check the Exterior Walls           
    • Airtight           
    • Control Moisture           
    • OVE Techniques           
    • 2x6 Wall Construction           
    • Wall Sheathing           
    • Check Under the Floors           
    • Floors and Crawlspaces           
    • Check the Ductwork           
    • Types of Insulation           
    • Blankets           
    • Blown-In Loose-Fill           
    • Foam Insulation           
    • Rigid Insulation           
    • Reflective Insulation           
    • Radiant Barriers           
    • Insulation Labels           
    • Where to Look for Insulation           
    • Roof Ventilation and Insulation           
    • Roof Vents and Insulation Clearance           
    • Ventilation Required           
    • Some Roof Ventilation Definitions           
    • Inspecting the Roof Ventilation in 10 Steps           
    • Ice Dams           
    • Roof Ventilation Based on Climate and Insulation Amount           
    • Rule of Thumb           
    • Roof Height at the Eave           
    • How Basement Walls Should Dry to the Interior           
    • Finding Interior Foam Insulation and a Fire Hazard           
    • Look for Holes That Allow Air Leakage into the Basement Wall           
    • Check for Moisture at Bottom of Basement Finished Walls           
    • Slab on Grade Construction           
    • Is the Slab on a Mound with Clearance?           
    • Required Vapor Diffusion Retarder with a Capillary Break Beneath It           
    • Cracks in the Slab and Moisture Problems           
    • Rebar Reduces Cracking           
    • Insulation on the Exterior Slab-On-Grade Foundation           
    • Frost Protected Shallow Foundations and Insulation           
    • Slab-on-Grade Insulation and Finishes           
    • Slab with Moisture-Resistant Finishes           
    • Slab with Moisture-Sensitive Finishes           
    • Missing Slab Insulation           
    • Signs of Moisture Problems           
    • Crawlspaces, Insulation and Moisture Problems           
    • Crawlspace Floor Might be a Mud Slab           
    • Crawlspace Floor Covered with Plastic           
    • Crawlspace Wall is Damp-Proofed           
    • Vented vs. Non-Vented Crawlspaces           
    • Understanding Vented and Non-Vented Crawlspaces           
    • Air Leakage and Major Moisture Problems           
    • Air Sealing           
    • Look for Big Air Leaks           
    • Air Sealing from the Attic           
    • Cathedral Roofs and Air Leaks           
    • Cathedral Ceilings and Insulation           
    • Why Would an Inspector Recommend Controlling Air Leakage?           
    • Blower Doors – Useful Tool Checking Air Leaks           
    • Air Barriers           
    • Examples of Air Barriers           
    • Four Types of Air Barriers           
    • Vapor Diffusion Retarders           
    • For Hot/Humid Climates, Walls Dry Towards the Inside           
    • Inspecting “Warm Walls” in Cold Climates           
    • For Cold Climates, Walls Dry Towards the Outside           
    • Ventilation of the House Interior Air           
    • Purpose of Ventilation           
    • Three Ways to Ventilate           
    • Natural Ventilation           
    • Whole-House Ventilation           
    • Energy-Recovery Ventilation Systems           
    • Spot Ventilation           
    • Bathroom Ventilation Ducts and Fans           
    • Windows           
    • Condensation in Double-Paned Windows           
    • Safety Glass for Inspectors           
    • Doors           
    • Sectional Garage Door Inspection in 10 Steps           
    • Garage Door Labels           
    • Egress, Steps, Handrails and Illumination           
    • Emergency Escape and Rescue Openings           
    • Floors, Walls and Ceilings
    • and much more!
    Upon completion of this course and passing of the 60-question final exam, the student can download and print their own Certificate of Completion which is auto-generated in their own name.
    The student's (InterNACHI member's) information is recorded on InterNACHI's servers for membership compliance verification, and automatically logs completion into InterNACHI's online Continuing Education log. 
    Members will need their username and password.  If you have forgotten your password, CLICK HERE (instant response) or email and request it (don't forget your name). 
    InterNACHI... #1 in inspection education. 

    Other inspection courses.  
    Some features which make InterNACHI's courses superior to existing continuing education options:
    • The course is free for all InterNACHI members.
    • The course is written in pure XHTML code for quick loading.  The course loads fine on old computers and loads fast, even with dial-up.
    • The course is designed using a hierarchal menu coupled with a sequential page navigation.  This provides the student with the option to easily repeat areas of weakness.
    • The course permits the student to start, stop and restart any part of the course as often as desired.
    • There are a variety of images within the course, including diagrams, illustrations and photos. 
    • The illustrations can be enlarged for clearer viewing by clicking on them.
    • The text is integrated into InterNACHI's Inspector Glossary.  Rolling over blue-colored terms provides their definition.
    • The final exam uses multiple-choice questions that reference the images. 
    • The course's quizzes and final exam have numerous advantages over traditional exam systems:
      1. The course, quizzes and final exam incorporate built-in intelligence which identifies and strengthens each student's unique subject weaknesses.
      2. Not only is each question weighted with regard to score, but each answer is weighted, as well as the correctness of each answer being weighted.
        1. Answers to easy questions are weighted such that the student is penalized, in terms of score, for answering incorrectly, but rewarded modestly for answering correctly.
        2. Answers to difficult questions are weighted such that the student is rewarded, in terms of score, for answering correctly, but not penalized for answering incorrectly.
        3. Answers to questions regarding basic safety, or questions every inspector should know the answer to, are weighted such that the student is severely penalized, in terms of score, for answering incorrectly.
    • Upon passing the final exam, the student can print out a Certificate of Completion which is auto-generated in their own name.
    The student's (InterNACHI member's) information is recorded on InterNACHI's servers for membership compliance verification, and automatically logs completion into InterNACHI's online Continuing Education log.