What You Need to Know About Asphalt Shingle Granules

In North America, asphalt shingles are the most widely used roofing material on residential properties. These roofing shingles are coated with protective granules that serve numerous important functions. Keep on reading to learn more about asphalt shingle granules — an exterior remodeling contractor will guide you through.

What Are Asphalt Shingle Granules?

An asphalt shingle is traditionally made of a base mat from either an organic or inorganic material. This mat is saturated with asphalt and then topped with mineral granules, which are often made of a mixture of slate, ceramic, stone, quartz, schist, or vitrified brick.

What Is the Purpose of Asphalt Shingle Granules?

The surface granules on asphalt shingles provide a certain level of protection to the asphalt core and are instrumental in blocking out ultraviolet light from the sun. They also give the shingle its ability to effectively shed water and resist fires. Light-colored asphalt shingle granules are known to be better at reflecting sunlight and keeping the home cooler year-round than dark-colored ones.

What Causes Asphalt Shingle Granules to Erode?

Since the mineral granules are responsible for absorbing the brunt of sunshine, they can deteriorate due to the wild, persistent heat. According to a residential roofing service provider, severe rainstorms during the spring and summer seasons can also cause the protective coating to erode. Other factors that contribute to granular loss include windswept debris, overhanging tree limbs, and algae and moss buildup.

What Happens When Asphalt Shingle Granules Erode?

If you see an excessive amount of granules in your gutters or downspouts, this means that your roofing material is eroding and in need of professional attention. Once a shingle is eroding, you run the risk of water-related damage such as leaks, mold, and rot. What you need to do is bring in a qualified roofer to perform needed repairs or, if the damage is extensive, a full-on replacement.


You can count on Timberland Exteriors for high-quality exterior improvement solutions, such as roof replacement and hail storm damage restoration, in and around Detroit Lakes, MN. Our certified team is committed to providing the comfort and satisfaction that Minnesota homeowners deserve. Call us at 651-439-1760 or fill out our contact form to request a free, no-obligation quote.

Schedule Your

Free Estimate

Contact Us

Convenient Financing Options

We Make Quality Exterior Remodeling Affordable

Two men are working on the roof of a house.
April 30, 2025
A roof is one of the most essential parts of your home. It keeps you protected from the elements and plays a critical role in the overall integrity of your house.
A group of people are standing in front of a house under construction.
May 8, 2024
Preparing your home for a roof installation is a crucial step to ensure that the process goes as smoothly as possible. Taking the time to get your home ready can significantly impact the efficiency and success of your roofing project.
A person is opening a window with a white handle.
April 26, 2024
In today’s environment-conscious market, energy-efficient windows have become a core component of home improvement projects, particularly in areas known for their harsh climates, such as Maplewood, MN.
A large white house with a black roof and red shutters
April 22, 2024
As the remnants of winter melt away and the first blooms of spring start gracing us in Maplewood, MN, it’s a signal for many homeowners to start contemplating home improvement projects that were put on hold during the colder months.
A blue house with white trim and a window
April 19, 2024
In the picturesque landscapes of Maplewood, MN, a home’s exterior is the visual handshake it extends to the neighborhood. Maintaining and enhancing the curb appeal of your property is crucial, not only for fostering a sense of pride but also for augmenting the value of your home.
Roof replacement
April 15, 2024
For homeowners in Maplewood, MN, and the surrounding areas, making decisions about roofing can be daunting. There’s a widespread practice known as a “roof-over,” where a new layer of shingles is installed over the existing one, which might seem cost-effective at first glance.
A large house with a large lawn and patio area in front of it.
March 29, 2024
One aspect that homeowners often overlook when tackling a siding installation or any home improvement project is the importance of a local contractor’s expertise.
An aerial view of a large house with a gray roof and blue shutters.
March 27, 2024
When embarking on a roofing project, the array of terminology used by professionals can sometimes be daunting. Understanding these terms is not just about making informed decisions for your home’s exterior but also about communicating effectively with your contractors.
A large house with a lush green lawn in front of it.
March 25, 2024
In the world of home improvement and design, a feature window isn’t just an opening in the wall; it’s a statement piece that transforms the aesthetics and functionality of your living spaces.
Show More