Resources
Roof System Infographics
Residential & Light Commercial
Asphalt Shingle Roofing System
30–50 Year Lifespan
Key Product Specifications
Base MatFiberglass
Weight235–350 lb/sq
Min. Slope2:12 (IRC)
Wind RatingClass H - ASTM D7158
Impact Resist.Class 4 - UL 2218
Fire RatingClass A - UL 790
Assembly Layers - Top to Bottom
ASTM · IRC · STL Code Reference
1
Architectural / 3-Tab Shingles - Fiberglass mat + asphalt + ceramic granules
2
Starter Strip Course - Sealed starter along eaves (IRC R905.2.2)
3
Ice & Water Shield - Self-adhering membrane at eaves and valleys
4
Synthetic Underlayment - ASTM D4869 synthetic or D226 Type I felt
5
OSB / Plywood Sheathing - Min. 7/16" APA-rated
6
Roof Framing - Engineered per IRC R802, ASCE 7
7
Ridge + Soffit Ventilation - Min. 1:150 ratio (IRC R806.2)
8
Galvanized Drip Edge Flashing - Min. 26-gauge (ASTM A653)
Advantages
- Lowest installed cost
- Wide availability
- Class 4 insurance discounts
- Easy to repair
- Wide color selection
Limitations
- Most susceptible to hail damage
- Granule loss requires inspection
- Shortest lifespan (30–50 yr)
- Algae growth in humid summers
Related Resources
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