What Are the Causes of Granule Loss on the Roof?

Hail

• Hail storms, at least in some climates, seem to be the natural enemy of shingled roofs. The impact of ice chunks falling from the sky can knock loose the shingle granules. Depending on the size and hardness of the hail, the impact can also break the asphalt material of the shingle. Depending on the homeowner’s property insurance, hail damage may be covered. Contact an insurance adjuster if hail damage is suspected.

Normal Weathering

• Shingles wear out over years of exposure to the weather. As the asphalt material dries out and loses its flexibility, the granules work free and can be washed from the roof by rain. Loss of granules do to natural weathering occurs soonest on roof portion exposed to constant sunshine. Roofs shaded by trees commonly offer the longest life.

Foot Traffic

• Walking on asphalt shingles, especially on hot days when the asphalt of the shingle is soft, dislodges granules. Limit foot traffic on the roof to absolutely necessary tasks performed early in the day when the shingles are cooler.

New Shingles

• New shingles commonly lose some granules during the first days after installation. The granules accumulate in the gutters, which may require cleaning. This is not a cause for concern unless the granule loss is severe enough to produce bald spots, portions of the asphalt shingle bare of granules, across the roof. This can indicate defective shingle. Contact the roofing contractor, or supplier if this was a do-it-yourself project, for warranty consideration.