If you notice some of your shingles are either lifted or missing, it means that your roof is having blow-off issues. Inclement weather is usually to blame for this issue, and many homeowners are quick to call a roof repair company to fix the damage.
While seeking assistance from roofing pros helps minimize the exposure of the roof deck to the elements, it disregards the more important question: what led to the shingles getting blown off in the first place? The answer to this question will bring to light the underlying problems that your roof might have. Read on as we discuss the common causes of shingle blow-offs and the necessary fixes. We’ll also discuss the need to either repair or replace a blown-off asphalt shingle roof.
The Wind Resistance of Asphalt Shingles
But first, we must establish the fact that modern asphalt shingles are engineered to withstand the elements, including strong winds. Most of them, in fact, have wind resistance ratings, which means they’re expected to perform as intended and remain on your roof when exposed to specific wind speeds. They can hold out winds between 110 and 130 miles per hour, which, according to the National Hurricane Center, are those that occur during moderate to major storms. In other words, these asphalt shingles can only be blown off by winds stemming from tornadoes and hurricanes. Otherwise, the problem could be resulting from either a structural problem or a material defect.
It is also worth noting that asphalt shingles are installed in two ways. The first method involves the use of roofing nails that hold each shingle securely to the roof’s decking or sheathing. They come in various sizes and materials, but the most commonly used nails are those with short shanks with sharp points and wide, flat heads. This ensures that every shingle is fastened without ripping it or causing damage to the wood. The second method utilizes an adhesive strip located at the bottom of the asphalt shingle. It helps adhere to the shingle below it, creating a tight seal that protects your home from the damaging effects of water intrusion.
Causes of Shingle Blow-Off
Shingle blow-offs aren’t limited to old, dilapidated roofs; even newly-installed ones can also experience this issue. There are several causes for this, and most of them require a thorough analysis by a reliable roofing contractor.
- Improper Nailing Pattern
Each asphalt shingle has a narrow strip that serves as a guide for proper nail placement. To ensure optimal protection, the nails on the overlapping shingle must catch the top edge of another shingle beneath. This won’t be the case if the nails are placed too high and not across the nail strip, reducing the number of nails going into each shingle by half. The result: some shingles become more vulnerable to being blown-off during high winds.
- Excessive Overhang
Correctly-installed asphalt shingles have one end hanging over the edge of the roof between one to one-and-a-half inches. If drip edge flashing is installed, their ends that hang over the roof edge must be between half an inch to three-fourths of an inch. Too much overhang and the shingles are likely to be torn off by strong winds.
- Roof Deck Damage
Loose shingles could also indicate an underlying problem in the roof’s decking. Made of plywood sheathing, OSB board, or similar durable material, the decking or sheathing provides a base for the underlayment and the actual asphalt shingles that cover the roof. This integral part of the roofing system can become compromised by moisture due to water runoff penetrating through the shingles, leading to rotting and warping of the material. If not addressed promptly, the shingle nails may pop, dislodging the shingles and increasing their chances of getting blown off the roof.
- Seal Strip Problems
Shingle blow-offs are also caused by the failure of the seal strips long after the roof is installed. Experienced roofers avoid this by taking the humidity, intensity of the sun’s heat, and the quality of the shingles into account. A four-to-six-week period is enough to ensure the seal strips adhere to the underlayment and keep the shingles secured.
Depending on the material quality, exposure to the element, and level of maintenance, three-tab shingles are expected to last between 10 and 15 years on average. Architectural shingles, meanwhile, have an average lifespan of up to 25 years. As they approach the end of their lifespan, however, the adhesive beneath no longer holds them in place. The shingles’ effectiveness diminishes quickly, increasing their chances of getting blown off by the wind.
Repairing Vs. Replacing a Roof With Blow-Off Issues
Loose or missing shingles are a serious problem that must be addressed as soon as possible. There are two ways to deal with this: repair or replace the roof. Here’s what you need to know about each option.
- Roof Repair
A roof repair makes sense if the loose or missing shingles are located within a small section of the roof surface. The damaged shingles can be removed and replaced with new ones right away. It is also a cheaper option because you won’t have to replace the entire roof, which comes at an extra cost in the form of a full tear-off. One downside of this, however, is the fact that it is difficult to match the color of the new shingles with the old ones. This compromises your home’s aesthetics and diminishes curb appeal.
- Roof Replacement
If more than one section of the roof begins to show signs of failure, it is also likely that the rest won’t hold on for much longer. Performing repairs will only delay the inevitable, which is why a complete roof replacement is the better option in this regard. Despite being a significant investment, the initial cost of a new roof will pay itself off in the long run. It also allows you to choose from a wide variety of colors, materials and roofing options to improve your home’s aesthetics.
To determine the best course of action for your roof, get in touch with the experts at Southern Roofing Company for a free, no-obligation analysis. We specialize in a range of residential roofing materials, including asphalt shingle, tile, cedar shake, slate and metal roofing. Call (470) 619-4360 or fill out our contact form.
Vivian Black says
Thank you for suggesting that loose shingles can be a problem with the roof’s decking. My parents noticed that they are starting to lose shingles on their roof. Even though it is only ten years old, they are concerned. I will call a roofing contractor for them sometime this week.
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Dealer License Iowa says
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