How can I know if my roof has hail damage?

Posted by on Mar 3, 2013 in Expert Advice | 0 comments

For hail to damage your roof it typically needs to be the size of a golf ball or larger. The shape, density and speed of the hail as it impacts the shingles are also considerations. Much larger hail, from 2 to 5 inches in diameter, is not uncommon. In the worst cases when the hail strikes the shingles it tears through the top layer and allows water to leak through the shingles. In these cases water penetration can happen immediately or within the first few weeks after the storm.Golf Ball Sized Hail

Most hail damaged roofs (from hail 2 to 3 inches in size) will not leak for several months. In these cases the damage cannot be seen from the ground. An inspection must be made while on the roof with a perpendicular view. The damage may appear as nothing more than a thumb size, half moon shaped black line. This is an outline of the impact from the hail hitting the shingle. It may seem to be harmless, but this sign indicates that the mat of the shingle (the base upon which the shingle is built) has be cracked. At this point it is only a matter of time before the roof begins to leak.

Another common problem from the smaller size damaging hail is the bruising of shingles. This happens when the hail impact drives the top granules down into the shingle. At the point of these bruises (over a period of a few months to 1 year) the granules will disappear and the shingle and mat will began to break down from exposure to the UV rays of the sun. Leaks are inevitable, although it may be 6 months to 3 years before this happens.Hail Damaged Roof

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