The manufacturing processes
Asphalt shingles are manufactured by embedding a fiberglass mat in modified bitumen, then surfaced with a blend of colored mineral granules, both for protecting asphalt and providing a pleasing appearance.
3-tab shingles named for their appearance having 3 tabs are standard and perhaps one of the oldest styles of shingles.
Laminated shingles also known as architectural shingles, contained more than one layer laminated (glued) together to give a more 3-dimensional appearance. Laminate has become very popular with architects and builders for their appearance and easier installation.
Interlocking shingles come in various shapes and sizes. Installed in an interlocking method that provides superior wind resistance.
The system components
Every roofing system has a service life cycle. Starting with the installation and ending with its removal and replacement at the end of its service life. Several factors will affect the actual service life of the roof system from proper to improper installation to excellent or poor maintenance.
An overlay is when a roofer installed an additional layer of asphalt shingles over an existing layer. Over time the fasteners from the first layer will work their way through the top layer, leave small holes all over the roof. These holes allow water intrusion and subsequent damage, and when it comes time to re-roof the house, it will be a costly job. Much more expensive than just having the first roof system removed. I never recommend an overlay.
Henry Staggs, NCCER Master Trainer, Adjunct Professor and Roofing Industry Leader
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