There are basically 2 types of shingles.
The 3 tab shingles will wear out in the tab area on the lower shingle because it's only 1 layer thick there. Where as the architectural shingles don't have the tab slot and are 2 layers thick everywhere. Plus, without the tab water has fewer places to seep into. As this photo from a recent re-roof shows.
- Three tab shingles
- Architectural shingles
- They aren't as likely to blow up from the wind
- They last longer.
The 3 tab shingles will wear out in the tab area on the lower shingle because it's only 1 layer thick there. Where as the architectural shingles don't have the tab slot and are 2 layers thick everywhere. Plus, without the tab water has fewer places to seep into. As this photo from a recent re-roof shows.