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What's the difference between Organic and
Fiberglass shingles?


Organic shingles are made on a thick felt of wood and other cellulose fibers.Glass shingles are made on a mat of non-woven glass fibers, which are held together with a water-insoluble binder. Both shingle types contain asphalt and are covered with mineral granules.

The Making of a Roofing Shingle

Asphalt Roofing Products are manufactured in a continuous process using organic felt or fiberglass mat as the core materials on which other components are layered. The organic felt is saturated and coated with hot asphalt and the top surface is then covered with a protective layer of colored, U.V. resistant ceramic granules. The fiberglass mat is coated with hot asphalt and the top surface is than covered with a protective layer of colored U.V. resistant ceramic granules.
     
Organic Shingles:
Have many decades of proven performance.

Are softer and more flexible than fiberglass shingles, especially in cold weather.

Contain more asphalt and nearly always use heavier weight reinforcement than fiberglass shingles of similar weight. - --

Absorb roof stresses better and are more tear-resistant than fiberglass shingles.

Are typically thicker than fiberglass shingles and are better able to hide minor imperfections in the roof deck or the old layer of shingles.
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Fiberglass Shingles
Compared with Organic Shingles:
Are relatively new.

Are more brittle

Show more imperfections in the roof deck.

Have less wind resistance.
     
WHY ARE THERE TWO TYPES?

For years all roofing manufacturers made shingles with an organic felt mat, but as the price of asphalt rose during the early 1980's, many manufacturers changed over to manufacturing fiberglass- based asphalt shingles. The reason? They use substantially less asphalt than do organic based asphalt shingles. This was done to cut costs, not because it was a better product.

HOW CAN YOU TELL THE DIFFERENCE?

Tear a small piece of each shingle. When the fiberglass-asphalt shingle is torn you can see the glass fiber, which looks like fine hair. When the organic-asphalt shingle is torn, you see the black saturated mat

WHAT'S THE DIFFERENCE?

Fiberglass-asphalt shingles are limp in warm and hot temperatures. This means they will conform to whatever they are laid over. If the roof deck is not perfectly smooth, fiberglass-asphalt shingles will "telegraph" or in other words, conform to the uneven surface. The result is a rough looking roof. In colder temperatures these shingles are brittle. Organic shingles are not limp in hot weather and are much easier to work with in colder temperatures. They also hide roof imperfections better.

WHICH ONE PERFORMS BETTER?

There are two characteristics that are important to keep shingles from being blown off a roof. The first is the sealant and how well it adheres. The second is the “NAIL PULL RESISTANCE”. This is a measure of how much force is required to pull the roofing nails through the shingle. As the wind blows over the roof peak, it creates uplifting forces on a shingle that can pull the shingles off the roof. This is the same type of force that gives lift to an airplane wing and allows it to fly. A shingle with a greater nail pull resistance is better suited to withstanding these wind forces. Organic-asphalt shingles have greater Nail Pull Resistance as compared to fiberglass-asphalt shingles.


 

 



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