After this last spring full of stormy weather, you make the climb up the ladder to clean out your gutters in preparation for the summer rains. Not surprisingly, you find the usual leaves and twigs, but you notice something unexpected: a pile of sand-like particles at the bottom of the gutters. Almost the color of coffee grounds, you realize that this grainy substance is the same color as your roof. Right about now, you’re probably wondering if this is normal or whether your roof is falling apart.
If this scenario sounds familiar, you are not alone. Finding granules in gutters is a normal part of owning a home with an asphalt shingle roof. However, excessive granule loss is a warning sign that the roof is wearing out or damaged and most likely needs professional attention. In this article, you’ll discover what granules are, why they end up in your gutter system, learn when it’s normal and when it’s not, and when it’s time to call a professional roofer to take a closer look.
What Are the Granules in My Gutters and Where Do They Come From?
Many homes throughout Northern Michigan are protected overhead by asphalt shingle roofs. If you look closely at each shingle, you can see that the surface is roughly textured. That’s because shingles are covered with tiny mineral granules, typically made from crushed rock. Once these granules have been screened to size, they are often coated with ceramic materials for color and durability. Granules on roof shingles serve several purposes, including:
- Protecting the underlying asphalt from damaging UV rays emitted by the sun, which dry it out and cause cracking and rapid deterioration.
- Aiding in fire resistance.
- Adding color and texture to provide a more aesthetically pleasing look.
- Helping to withstand weather exposure by adding weight and texture that aids in water shedding, wind resistance, and temperature swings.
- Increasing the longevity of the underlying roofing materials.
When roof shingles are manufactured, they are generously coated with these granules, which naturally shed off during the first rains after a new roof is installed. For this reason, it is normal to see a noticeable amount of granules at first, but over time, it should slow down, with only a small amount ending up in the gutters. Let’s take a moment to look closer at the common causes of granule loss.
Why Do Roof Granules End Up In Gutters?
Naturally, granule loss from roof shingles is inevitable. And with the gutters catching runoff from the roof, it only makes sense that granule loss is most noticeable here, but it doesn’t always mean it’s time for a new roof. But sometimes it does. Below, you’ll learn about the most common causes of granule accumulation in the gutters.
New Roof Shedding: As mentioned earlier, it is normal for a new roof to shed excess granules immediately after installation. New roof shedding is not considered a roof defect and is to be expected.
Normal Aging: Like any object exposed to the elements 24/7, roofing materials wear out over time. Consider the sun exposure, rain, wind, and temperature fluctuations roofs are exposed to. In a climate like Traverse City, roofs face severe weather, and a certain degree of granule loss is normal as roofs age. After 15 years, this becomes more noticeable.
Harsh Weather: In Michigan, storms can be intense. With heavy rains, strong winds, ice dams, snow, hail, and falling trees, granules can easily be dislodged, especially on south-facing or wind-exposed slopes.
Inadequate Attic Ventilation: When attics lack adequate ventilation and insulation, excess heat from inside the home escapes through the roof, softening asphalt shingles and making the granules easier to wash away.
Poor Quality: Low-quality shingles and improper installation techniques can contribute to premature deterioration of roof shingles and excessive granule loss.
Foot Traffic: Foot traffic during repair can loosen granules, especially on older roofs, contributing to granule loss.
Right after having a new roof installed, or the occasional light shedding after a storm, is usually no big deal. It’s when homeowners begin to notice heavy buildup consistently or for no apparent reason that one might start to worry.
When Should You Be Concerned?
With a better understanding of when granule loss is normal, it can be easier to recognize when it’s not. Below, we’ll examine situations in which granule loss shifts from normal to a potential problem.
- When your gutters repeatedly contain large piles of granules, or you notice significant amounts of granules where the downspouts drain onto the ground, it may indicate shingle deterioration. This is especially concerning when the roof is over 10 years old.
- When you look at the roof, do you notice dark spots, uneven coloring, or bare patches? These are all signs of granule loss that make the roof more vulnerable to UV damage and accelerated aging.
- Hail can cause widespread roof damage, knocking granules loose and creating weak points in the shingles. When homeowners notice excessive granule loss and visible hail-impact marks, contacting roofers in Traverse City for a professional inspection is warranted.
Ignoring granule loss can be risky business. Let’s take a moment to learn about the risks of excessive granule loss from the roof.
What Are the Risks?
We learned earlier about the protective properties of granules on asphalt shingles. From protecting against UV damage to enhancing fire resistance, the granules on shingles serve many important purposes. The first line of defense for shingles is the granules, which protect the asphalt and underlying roof materials and play a key role in overall home protection. Once a significant number of granules are gone, shingle roofs deteriorate faster, leading to cracks, leaks, and eventually the need for a full roof replacement. If excessive granule loss is not addressed in time, homeowners may face both expensive water damage remediation and the cost of a new roof. That begs the question: What should homeowners do if they notice granule loss to avoid the potentially devastating consequences of a failed roof?
What to Do If You Find Granules in Your Gutters
Finding granules in your gutters, as in the situation at the beginning of the article, isn’t necessarily a cause for alarm, but it is definitely worth investigating. Use the following checklist to evaluate the situation and prevent a small issue from escalating further.
Monitor Granule Loss
If you recently had a new roof installed or a storm just rolled through, monitor granule accumulation over time to ensure granule loss decreases.
Clean your gutters regularly and take note if granule loss increases with each cleaning.
Homeowner Inspection
From the ground, homeowners should inspect the shingles’ appearance using binoculars for a close-up view, looking for bald spots, discoloration, or damage, such as missing or curling shingles.
Professional Inspection
When you notice increased granule loss during a ground inspection or see visible damage or missing shingles, the next step is to contact roofers in Traverse City for a professional inspection by the experts who understand roofs and local weather conditions. Qualified roofing professionals have the experience and equipment to climb onto the roof, assess the condition, and determine whether the loss is normal wear or a bigger issue. Many local roofers offer free or low-cost inspections that assess ventilation, attic insulation, flashing, and other potentially related roofing components, and provide practical solutions.
Preventive Maintenance
Preventive maintenance, such as regular cleanings, maintaining adequate attic ventilation, trimming overhanging branches, and promptly addressing storm damage, is a way homeowners can prevent and monitor granule loss. Another way to ensure granule pss doesn’t become an issue is by partnering with a roofing professional who offers scheduled maintenance. This way, homeowners can ensure their roofs are monitored even when they don’t have time to do it themselves.
For asphalt roofs nearing the end of their lifespan (typically 20 to 30 years), granule loss usually means one thing: it’s time to start planning for replacement.
Act Early and Protect Your Home
Although granules in your gutters don’t always mean disaster, they can be an early warning sign that your roof is in trouble. In many cases, small amounts of granules are normal and easily explained, and for new roofs, some initial granule loss is expected. However, excessive granule buildup in the gutters, bald shingles, and storm damage suggest an issue that warrants further investigation. Homeowners who understand what is normal and what’s not know when to schedule a professional inspection to catch problems early and plan for roof repair or replacement if necessary. If you’ve noticed granules accumulating in your gutters or visible shingle damage from the ground, reach out to local roofers for a quick inspection. A little attention today can keep your home protected for many tomorrows.