Manufacturing Defects
Shingles suffering from manufacturing defects are generally rare considering the enormous volume of this material produced each year. Donan Engineering works with many major asphalt shingle manufacturers, and we frequently tour their assembly plants in an attempt to observe how these materials are made, where material or assembly defects may occur, and how these defects will manifest themselves once these materials are subjected to the unrelenting forces of nature.
Whether cosmetic and nothing more than a nuisance or structural and a cause for concern and replacement, manufacturing processes and the defects they can cause are important to understand when studying asphalt shingle roofs. Donan Engineering has been involved in countless projects where problems or conditions have been misdiagnosed as manufacturing defects, hail damages, improper ventilation, normal wear and tear, installer activities, etc.
There is no comprehensive list of asphalt shingle manufacturing defects and how they occur. Donan Engineering addresses many of the proven and most common defects and how they occur in several of our roof training courses, and we strongly encourage professionals to be knowledgeable of these issues prior to interpreting shingles for damage from hail or other common perils.
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