How Thermal Shock And The Freeze-Thaw Cycle Damage Shingles


Your new asphalt shingles may look strong and reliable, but that doesn't mean that they're actually invincible. In point of fact, the elements can damage roofing shingles in a number of ways not limited to the common types of damage, such as having your shingles blown off by wind or having the granules knocked off by hail. Other types of damage that the roof can incur from the elements include having the sun's UV rays oxidize the surface of the roof, causing it to become more brittle, and suffering damage from thermal shock or the freeze-thaw cycle. Here's an explanation of these two types of damage and how they can affect your shingles.

Thermal shock

Thermal shock indicates a type of damage that occurs when your roofing material's normal accommodations for changes in temperature (the expansion or contraction that occurs when the material gets hotter or colder) can't keep up with the sudden changes. Extreme changes in temperature can cause different parts of the shingles to change size more or less rapidly depending on factors such as how supple the material is. Although the changes in size are so small as to be hardly evident to the human eye, a disparity in the rapidity of size change can cause different sections of the shingle to warp, crack, or even tear themselves apart. Buckling from warped material and tiny fissures are typical of this type of damage.

Freeze-thaw cycle

The freeze-thaw cycle is a powerful force in nature. It can topple hillsides and cause landslides, and it can damage your roof and even cause cracks and potholes to develop in asphalt roads. The freeze-thaw cycle happens when moisture gets into tiny grooves or crevices and then freezes there. Because water expands when it freezes, this has the effect of exerting an outward force on the crevice, causing it to widen and perhaps starting a crack in the material. After the ice has thawed, moisture can once again fill the (now slightly larger) groove and freeze there, making it expand once again. As you can see, having this happen all winter long can have the potential to cause harm to your roofing shingles.

These two types of weather-related damage are less obvious than hail damage, but they can be super insidious and cause roof damage that you may not notice unless you're paying attention. This is why it's important to have regular roof inspections that will allow you to catch damage early before you get expensive leaks.

To repair your roof or keep it well maintained, contact professional roofing companies, like Berkeley Exteriors


22 November 2016

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