Roof Archives - Top Inspectors

Did your roofer or home inspector tell you that your roof shingles are degranulating? What does roof shingle degranulation or granule loss mean and what are granules anyway?

Let’s talk about what roof shingle granules are, what they do and what happens when they come off your roof.

What are roof shingle granules?

Roof shingle granules are actually crushed rock mixed with ceramic granules. They are then colored and treated with other components and features to give the shingles enhanced functions. For example: copper granules are sometimes added into the mix to help resist blue-green algae.

The main purposes of granules is to help shed water and to protect against UV rays. The granules protect the material underneath from exposure by absorbing heat and moisture.

What causes roof shingle degranulation or granule loss?

We know nothing lasts forever, and shingles will eventually wear out. This is the most common reason for granule loss. Eventually, the adhesion to the asphalt and fiberglass underneath fails and the granules fall off. Other reasons for roof shingle granule loss is heavy rain, hail and high winds.

How can I tell if my roof shingles are degranulating?

Here are some ways to tell if your roof shingles are losing their granules:

Check your gutters and downspouts to see if there are excessive loose granules inside. The rain will wash granules into the gutters if they are loose. It is normal for some granules to come off from time to time, but if there are piles inside the gutter or at the bottom of the downspout, that could be an indication that the roof is degranulating.

Walk around the perimeter of your home and stand back far enough from the house so you can see the roof. Look for discoloration or a “shiny” look. Sometimes you can see “bald spots” on your roof even from the ground. This usually means that the roof is missing some granules.

When do I need to replace my roof shingles?

Granules help to make sure that your roof is holding up against the weather. Degranulation does not always mean you need a new roof. When the degranulation is from weather damage, it can be sporadic and only the damaged shingles need to be replaced.

Very worn and degranulated roof shingles — Very worn and degranulated roof

Should I get my roof shingles inspected?

If you are worried about your roof and you see signs of degranulation, it is great idea to get a roof inspection. Top Inspectors can do an inspection on your roof to let you know what the condition is and help you get the information you need to move forward and ensure your roof is protecting your home the way it should be!

Why does roof shape (geometry) matter?

This is a fairly common question we get during home inspections. Especially when we are also doing Wind Mitigation inspections. Roof geometry is very important, especially in Florida, because the different shapes can make a big difference when high wind or hurricane season comes! So let’s talk about the different types of roof shapes and what they mean, and the pros and cons of each.

Gable roof

A gable roof is a pitched roof that basically looks like an “A”. It is sloped on two sides and open at both ends. Some roofing materials typically installed on gable roofs include asphalt shingles, clay/cement tiles and metal. Gable roofs are typically less expensive to replace because they have less surface area. This type of roof is good at shedding water if it has a steep enough pitch. However, it has been known to be susceptible to damage or issues in high wind or hurricane conditions. But don’t worry! Big issues are usually rare. Having a Wind Mitigation inspection is a great way to see if the roof is attached to the home correctly to offset the high wind resistance.

Hip roof

A hip roof is a pitched roof but it doesn’t open on the ends. It looks almost like a pyramid that has a flatter ridge on top. Ever wonder why the Great Pyramids have stood for so long? That shape is extremely strong structurally and highly aerodynamic, which means the wind just passes around it and rarely causes any damage or resistance. Some roofing materials typically installed on hip roofs include asphalt shingles, clay/cement tiles and metal. This is one of the strongest roof shapes. However, replacement of roofing materials can be on the pricier side because the roof surface is greater.

Flat/low slope roof

Flat/low slope roofs are much less common in Florida, but there are some. Some roofing materials typically installed on flat roofs include built up roof, tar and gravel (another form of built up), rolled roofing (like huge flat shingles) and different types of membrane. Flat roofs are convenient because they can be traversed easily, they are usually not as expensive to replace and they are easy to add additional features to if the structure design permits. However, they do tend to “pond”, which means low spots will form and pooling occurs. This can be especially concerning in Florida where we often have flooding rains. On flat roofs, the system should be very well sealed and at least some slope should be incorporated.

Shed roof

These types of roofs were originally designed for farm sheds and lean-to structures. Sometimes these roofs are also called “skillion” roofs. The shape is like half of a gable roof, just one long slope. They are great for their solar potential if built correctly. Some roofing materials typically installed on shed roofs include asphalt shingles, clay/cement tiles and metal. The downside is that they are highly susceptible to wind damage and offer limited protection in harsh weather conditions.

Gambrel roof

These roofs are often called “barn roofs”. This type of roof is like a gable roof but there are two different slopes. These types of roofs have great potential if a second story is desired. Some roofing materials typically installed on gambrel roofs include asphalt shingles, clay/cement tiles and metal. These roofs require very consistent maintenance and again can be susceptible to high wind damage.

Mansard roof

This type of roof is similar to gambrel roofs with the two different slopes, but is almost always four-sided. These types of roofs are not very common in Florida. They offer the pros, but also the cons of both low pitched roofs and a pitched roofs.

There are many other types of roofs, but these few are the most common found in Florida. Sometimes different roof shapes are combined in one house. If you don’t have one of the stronger roof shapes, don’t worry! There are always ways to make it stronger to survive beautiful and crazy Florida!

Category: Roof

What Is Roof Shingle Degranulation?