Effects of Hail on Roofing

Asphalt shingles are the most commonly used type of wall and roof shingles. Because of their inexpensive up-front cost and simplicity to install, they are widely used in North American houses. Asphalt shingles were first used and installed in the year of 1901. Shingles exhibit less resistance to hail as they age. If you are an Atlanta roofing company you know that with the passage of time, they become more fragile and less resistant to hail. In the early 1960s, research was carried out to examine the impact of hail on the shingles and the roofing industry. The results indicated that the hail more than 1.5 inches damage the asphalt shingles. To protect the roofs and walls from hail for a long time, UL 2218 Class 4 is the best. The type mentioned is comparatively more susceptible to hail but as it ages, the capacity to prevent declines. Hail forms when the frozen water droplets are lifted up because of the turbulent wind regimes during the times of a thunderstorm. These droplets combine and condense and later according to the power of the storm and gravity fall back to the surface. The size of hail varies, and the hail stones vary in diameter from ¼ inches in diameter to 11/2 inches in diameter. The size of the hail stones is directly proportion to the damage together with the angle it strikes the shingles that are directed by the wind. The tearing effect of hail on the shingles is much more damaging compared to the glancing blow resulting in roof repair or roof replacement.

The hail damage to the asphalt shingles results in high granule loss together with the removal of the material from the edges together with the penetration. Most of the times, first of all, grit is lost from the asphalt as a result of pounding caused by the hail storm. New asphalt shingles are more resistant to the hailing because as the asphalt ages, it becomes more and more brittle. Most of the times, the damage as a result of hail is cosmetic in nature and in no way affect the lifespan of the roof or the walls until or unless it is severe. In the rare, severe cases, granule loss, penetration, and fracture of the shingles may require the replacement of the shingle.

There are four major facts concerning the impact of the hail storm on the shingles as it applies to roofing. First of all, the maximum size of the hail must be somewhere between 1 3/4 to 2 inches in diameter to cause the hail bruises that equals (greater than ten hail strikes per 100 square feet). Secondly, the number of bruises in contrast to the roof pitch ratio suggest that shallow and steep roofs (that is 4 inch/12inch in pitch and more steep than 1 inch/12 inch respectively) exhibit much more hail strokes compared to the moderately sloped roofs (that is 5 inch/12 inch to 9 inch/12 inches in roof pitches). Thirdly, the shingles exposed on the roof surface facing towards the storm have 21/2 times more hail strokes compared to the roof elevations facing away from the hail storm. Lastly, the elevation of the roof facing towards the incoming hail storm contains more than two times more hail bruises compared to the roof elevations perpendicular to the hail storm.

Conclusively, there exists a very strong correlation between the hailstone damage, the size of the hailstones, the pitch of the roof and the direction of the shingles on the roof compared to the angle of the angle and direction of the incoming storm.



Petty, Stephen. Evaluation Of Hail-Strike Damage To Asphalt Shingles Based On Hailstone Size, Roof Pitch, Direction Of Incoming Storm, And Facing Roof. RCI. N.p., 2016. Web. 23 Apr. 2016.