InterNACHI Asphalt Composition Shingle Defect Recognition GuideThis is a PDF download! You will need a PDF reader to open the document.This field guide to inspecting asphalt shingle roofs was developed to provide the user with a quick reference tool for use in evaluating comp shingle roofs. It's designed to help in identifying a wide range of defective and correct conditions. With over 170 high-resolution photographs, illustrations and diagrams, it covers flashing plus three-tab, laminated and T-lock shingles, including both organic and fiberglass. It covers shingle components, problems due to aging, wear & tear, impact, abrasion, poor ventilation and improper installation. Developed by Kenton Shepard, author of InterNACHI’s Certified Roof Inspector course.***PDF is 72 MB in size, so allow some time for the download to occur. We STRONGLY recommend that you do this on a high speed internet connection.
