Understanding Roof Impact Ratings

Impact-resistant shingles are tested using the UL 2218 standard, which simulates hail strikes using steel balls dropped from specific heights.

The Testing Process

Shingles are struck twice in the same location with a steel ball:

• Class 1: 1.25" ball from 12 feet
• Class 2: 1.5" ball from 15 feet
• Class 3: 1.75" ball from 17 feet
• Class 4: 2.0" ball from 20 feet

To pass, the shingle must show no cracks after both impacts.

What Each Class Means

Class 4 (Highest)

• Withstands 2-inch hailstones
• Best protection for hail-prone areas
• May qualify for 15-35% insurance discount
• Examples: Owens Corning Duration FLEX, CertainTeed NorthGate, Malarkey Legacy

Class 3

• Good hail resistance
• Standard for quality architectural shingles
• Examples: GAF Timberline HDZ, CertainTeed Landmark

Class 1-2

• Basic protection
• Not recommended for hail-prone areas

Do You Need Class 4?

Class 4 is strongly recommended if you live in:

• Texas (especially DFW, Austin, San Antonio)
• Colorado (Front Range)
• Kansas, Oklahoma, Nebraska
• Parts of Missouri, Iowa, Minnesota

Insurance Benefits

Many insurance companies offer premium discounts for Class 4 roofs:

• Texas: 15-35% discount
• Colorado: 10-25% discount
• Midwest: 10-20% discount

Important: Get written confirmation from your insurer before upgrading.