Let's Talk Class 4 Hail Impact Resistance Roofing Ann Iten, Director of Marketing

Roofing materials are given a rating over it’s ability to resist hail damage. Your average asphalt shingles with low impact resistance may easily break or crack during a hailstorm which will then expose your roof to water and moisture penetration. When water starts seeping into your roof deck, it will result in wood rotting and your roof will start to leak. But even if the hail damage does not penetrate through the back of the roofing material, the hail impact will definitely make your roof look battered and shabby.

At present time, Class 4 hail impact resistance on asphalt, stone coated metal and composite roofing material is the highest class of roofing which carries the UL 2218 Impact Test listing. To make the Class 4 rating, the roofing material is tested using a two inch steel ball, Class 4 hail impact resistance is given if the product does not show any indication or mark of punctures, ruptures, splits, cracks and tears from above and beneath the roofing material. Take note that these results are observed using 5x magnification to make sure that there are no miniature cracks or tears that cannot be seen by the naked eye.

Older roofs with asphalt shingle roofing can encounter damage from 2-1/2” hail stones. As your asphalt shingle roof ages, it becomes more brittle and less pliable. Because of this, it no longer has the capacity to absorb and transfer the impact energy and it’s serviceability reduces over time.

Boral Roofing Materials: Concrete, Clay, Composite and Stone Coated Steel

Let’s look at Boral Roofing materials that can withstand hail damage:

Clay and Concrete Roof Tile

Common in many regions of the country, hail storms can wreak serious damage to a roof. Some concrete and clay tile products offer Class 4 hail rating, proving their ability to withstand two-inch ice ball impacts shot from a cannon at 70 miles per hour in accordance with the FM 4473 Impact Test.

Stone Coated Steel Roofing

Stone-coated steel is one of the best possible materials for withstanding the devastating hail storms that impact many regions of the country, providing the highest UL-listed, Class 4 UL impact rating.

Composite Roofing

In accordance with UL2218, top quality composite roofing solutions offer a Class 4 hail rating, the highest achievable rating. This makes this roofing type ideal for hail prone areas of the country.

Homeowners in hail prone areas can reduce their risk of impact damage by installing Class 4 rated roofing. Many insurance companies will even offer a discount for homes with Class 4 rated roofing materials installed. That is why choosing a roofing material with the proper Class 4 impact rated roofing will ensure the durability of your roof.

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