TAMKO Building Products, Inc. is expanding its popular Heritage® line of laminated asphalt shingles to include a new Heritage® IR shingle. The innovative new reinforced shingle is classified by the Underwriters Laboratories for compliance with UL 2218 Class 4 Impact Resistance. The UL 2218 Class 4 Impact Resistance testing by UL involves a test where a 2-inch diameter steel ball is dropped onto the shingle from a height of 20 feet, impacting the same location twice and imparting 32 joules of impact energy per drop. Afterwards, the backside of the shingle is bent over a 4-inch rod and examined for visible cracks through the thickness of the shingle. The UL 2218 Class 4 rating is the highest impact resistance rating UL awards, and to receive this rating, the shingle must withstand the impact of the test without any visible cracks through the thickness of the shingle at each of six locations selected to represent the most vulnerable areas of the installed shingle.
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