Asphalt Shingles
Asphalt shingles are the most widely used residential roofing material in North America, covering roughly 75% of all homes. Available in 3-tab and architectural (dimensional/laminated) styles with 20–50 year warranties.
Fast Facts
- What Is It?
- Fiberglass-mat roofing shingles coated with asphalt and surfaced with ceramic-coated mineral granules for UV and weather protection.
- Common Uses
- Residential roof covering over solid sheathing (OSB or plywood) with underlayment. Minimum slope: 4:12 standard; 2:12 with special application.
- Cost Range
- 3-tab: $80–$120/square (100 sq ft); Architectural: $100–$180/square; Premium: $200–$400/square installed.
- Durability
- 3-tab: 20–25 year warranty. Architectural: 30–50 year warranty. Actual life 15–30 years depending on climate and ventilation.
Specifications
| Property | Value |
|---|---|
| Standard | ASTM D3462 (fiberglass-based); ASTM D228 (organic, largely obsolete) |
| Wind Rating | Class D: 90 mph; Class F: 110 mph; Class G: 120 mph; Class H: 150 mph (ASTM D3161/D7158) |
| Impact Rating | Class 1 (lowest) to Class 4 (highest, 2" steel ball drop test per UL 2218) |
| Fire Rating | Class A (best) — fiberglass shingles over approved deck |
| Weight | 3-tab: 210–240 lbs/square; Architectural: 240–350 lbs/square |
| Minimum Slope | 4:12 standard; 2:12–4:12 with double underlayment and sealed tabs |
Asphalt Shingle Types
Three-tab shingles are the economy option — lightweight, simple to install, and the lowest cost per square. Architectural (laminated) shingles are the current industry standard for new construction, offering better wind resistance, aesthetics, and longevity. Premium designer shingles mimic the look of slate or cedar shakes at a fraction of the weight and cost.
Installation Requirements
Asphalt shingles require solid roof sheathing (minimum 7/16" OSB or 15/32" plywood per IRC R803.1), underlayment (ASTM D226 Type I felt or ASTM D4869 synthetic), and proper ventilation (1:150 ratio without vapor barrier, 1:300 with). Ice-and-water shield is required at eaves in cold climates per IRC R905.2.7.1.
Ventilation and Longevity
Proper attic ventilation is the single biggest factor in shingle longevity. Excessive heat (140°F+) in an unventilated attic accelerates asphalt aging, causing premature curling, cracking, and granule loss. Ridge vents paired with soffit intake vents create continuous airflow that keeps sheathing temperatures manageable.
Frequently Asked Questions
What is the difference between 3-tab and architectural shingles?
3-tab shingles have a flat, uniform appearance with cutouts creating three "tabs" per strip. Architectural (dimensional/laminated) shingles are thicker, with layered tabs that create a textured shadow line. Architectural shingles are heavier, more wind-resistant, and carry longer warranties — 30–50 years vs. 20–25 for 3-tab.
Can you install new shingles over old ones?
Most codes allow one layer of re-roofing (new shingles over existing). The roof structure must support the added weight, and the existing layer must be reasonably flat. Two layers is the maximum per IRC R907.3. However, tear-off is preferred because it allows inspection of sheathing for damage.
What shingle class is best for hail?
Class 4 impact-rated shingles (UL 2218) resist cracking from 2" hailstones. Many insurers offer premium discounts (5–35%) for Class 4 shingles. SBS-modified (rubberized) asphalt shingles flex rather than crack on impact, making them the best choice for hail-prone regions.
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