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What Makes a Shingle Wind Resistant?

10/26/2018

Color and design are important factors when it comes to choosing roofing shingles, but the protection they offer your home is a vital attribute to consider as well. High winds can loosen the shingles on your roof enough to lift them and blow them off of your home. Lifted and missing shingles expose your home to damage by allowing moisture to trickle into the building materials below the layer of shingles.

What factors must you consider to protect your shingles from high winds and keep them on your roof? We can begin by studying a common shingle.

One of the first things you may notice about a conventional roofing shingle is one or more lines marked across the front of the shingle. These are marks left by the manufacturer to indicate the part of the shingle that is meant to be nailed to the roof, called the “nailing strip”.

In addition to the proper nailing location, the strength of the shingle is also important. One important factor that indicates the strength of a shingle is known as “pull-through resistance.” Pull-through resistance is defined as the amount of force needed to pull a shingle over the head of a roofing nail holding it in place. The quality of materials that make up the shingle determine the pull-through resistance, so high quality materials are very important. To emphasize the quality of their products, manufacturers mention the industry standards they meet and the independent laboratory tests they go through to verify their durability.

Shingles also have self-sealing adhesive asphalt strips on either the face or back that are applied during the manufacturing process. While roofing nails secure the shingles to the substructure of the roof (typically sheets of plywood called ‘the roof deck’), these adhesive strips secure the shingles together. Shingles are installed in overlapping layers, with the adhesive strips applied where the shingles come into contact with each other. Once the shingles have been installed, the warmth from the sun thermally activates the adhesive and creates a bonding of each shingle in a roof system.

The above factors and measures combine to form levels of redundancy designed to keep your shingles firmly affixed to your roof. If you are considering a new or replacement roof, high quality shingles installed by a knowledgeable professional roofer are highly recommended.


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