When clearing your eaves troughs, you may notice that some colored granules have accumulated in the gutters. Depending on the age of your roofing shingles and normal weathering processes, this is not unusual. An excessive amount of granules might be cause for concern. But what is considered "excessive"?
Whenever you clean your gutters, always be alert to unusual quantities of granules that may accumulate there and check that your roofing shingles aren't balding.
While there's no way to definitively quantify how much granule loss is too much, the best indication is to look at the roofing shingles themselves. When asphalt shingles are manufactured, more granules are embedded in their surface than are actually necessary so it's only natural that the superfluous, loose granules would wash away first.
Even on brand-new shingles, you can make out the black asphalt the granules are embedded in. However, if the asphalt shingles on your roof have relatively large bare patches where the granules have eroded away and exposed the underlying black weathering asphalt to the elements, you will need to replace any damaged shingles. If the problem isn't limited to just a few shingles, it may well be time for a roof replacement.
Greenawalt Roofing Company offers free roof assessments where a team member will visually inspect your roofs condition.