A roof represents one of the most significant financial commitments a homeowner in Bentonville will make during their lifetime. You expect this investment to last for decades and protect your family from the volatile weather in Arkansas. Manufacturers rate their asphalt shingles for twenty, thirty, or even fifty years. However, a rating is just a number on a piece of paper if the installation does not meet the necessary standards. Many roofs fail long before their expected lifespan expires. This premature failure is rarely due to defective materials. It is almost always the result of human error during the installation process or a lack of understanding regarding how a roofing system functions.
The difference between a roof that lasts thirty years and a roof that leaks in five years often comes down to the details. A shingle looks the same whether it is nailed correctly or not, at least from the ground. The problems hide underneath the surface and reveal themselves only when the damage is already done. Homeowners need to be aware of these common pitfalls to ensure they are hiring a contractor who values craftsmanship over speed. Understanding the mechanics of a roof failure empowers you to ask the right questions and protect your asset.
Improper Ventilation and Heat Buildup
Ventilation is perhaps the most misunderstood aspect of residential roofing. A roof needs to breathe. It requires a continuous flow of air that enters through the soffits at the bottom and exits through the ridge at the top. This airflow regulates the temperature and humidity levels in the attic. When ventilation is inadequate or blocked, the consequences are severe and widespread.
In the summer, a poorly ventilated attic acts like an oven. The temperature can soar well above one hundred and fifty degrees. This extreme heat cooks the shingles from the underside. The asphalt dries out and becomes brittle. The granules that protect the shingle loosen and wash away. You will see blistering and cracking on the surface of the roof years before you should. The adhesive strips that seal the shingles down can also degrade, leaving the roof vulnerable to wind lift.
In the winter, poor ventilation leads to moisture accumulation. Warm, moist air from your living space rises into the attic. If it cannot escape, it condenses on the cold underside of the roof deck. This water drips onto the insulation and soaks the wood rafters. Over time, this creates an environment perfect for mold growth and wood rot. The structural integrity of the deck is compromised from the inside out. A roofer who simply nails down new shingles without calculating the ventilation requirements is setting you up for failure. Balancing the intake and exhaust is a mathematical necessity for a healthy roof.
Incorrect Nailing Techniques
The nail is the primary fastener that holds the roof together. It seems simple enough to drive a nail into wood, but the placement and depth of that nail are critical. Every shingle has a specific nailing zone. This is a reinforced strip where the manufacturer intends the nails to be placed. If a worker misses this zone and nails too high, they miss the layer of shingle underneath. This significantly reduces the wind resistance of the roof. A strong gust can easily rip these shingles loose because they are not securely anchored.
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Nailing too low presents a different problem. Nails placed below the exposure line are visible to the elements. They will rust and eventually allow water to seep around the shank of the nail. This leads to thousands of tiny leaks that are difficult to locate. The depth of the nail is equally important. Pneumatic nail guns must be calibrated correctly. If the pressure is too high, the nail head drives right through the mat of the shingle. This cuts the material and offers no holding power. If the pressure is too low, the nail head sticks up. This pushes against the shingle above it and eventually wears a hole through the asphalt.
Experienced crews understand the nuance of gun pressure. They check their work constantly to ensure the nails are driven flush with the surface. They also adjust the nail pattern based on the slope of the roof and the local wind zone. Using four nails per shingle might be standard, but six nails are often required for high wind warranties. Skipping these extra nails is a shortcut that compromises the entire system.
The Dangers of Reusing Flashing
Flashing is the metal material used to seal the joints and transitions on a roof. It is found around chimneys, walls, and valleys. It is the most expensive part of the material list because it requires metal fabrication and skilled labor to install. Unscrupulous contractors often reuse the old flashing to save money and lower their bid. This is a critical mistake.
Old flashing is often rusted or bent. It has nail holes from the previous installation that will not align with the new roof. Reusing step flashing along a wall is particularly risky. These pieces of metal are woven between the shingles. Trying to pry up the old shingles and slide new ones under old flashing often damages the metal or breaks the seal. The flashing must be replaced every time the roof is replaced.
Chimney flashing is another common failure point. Ideally, the flashing should be embedded into the mortar joints of the chimney. This is known as counter flashing. Some roofers simply caulk a piece of metal to the brick. Caulk is a temporary sealant that breaks down in the sun. Once the caulk cracks, water runs behind the metal and into the house. Proper masonry work is required to ensure a long term seal. Trusting old, tired metal to protect your new investment is a gamble that rarely pays off.
Neglecting the Starter Strip
The edge of the roof is the first place wind attacks. The wind hits the eaves and tries to lift the shingles up. The starter strip is a special shingle designed to seal the first course of roofing to the deck. It has a continuous line of adhesive that locks the edge down.
Some roofers try to save money by making their own starter strips. They take a standard three tab shingle, turn it upside down, and nail it to the edge. This old school method is outdated and ineffective. The adhesive on a standard shingle is not positioned correctly to seal the edge. This leaves the perimeter of the roof vulnerable to uplift.
Once the wind gets under the first row of shingles, it creates a domino effect. The lifting force increases and peels back the subsequent rows. A dedicated starter strip is essential for achieving the wind rating specified by the manufacturer. It provides a straight and secure foundation for the rest of the installation. Skipping this component saves a few dollars upfront but costs thousands when a storm strips the roof bare.
Improper Valley Installation
The valley is the V shaped channel where two roof slopes meet. It handles the highest volume of water of any part of the roof. It acts as a river during a heavy rainstorm. If the water cannot flow freely or if the waterproofing is compromised, a leak is inevitable. There are different ways to install a valley, but they all require precision.
One common mistake is placing nails too close to the center of the valley. Water flows down the center and spreads out. Nails should be kept at least six inches away from the center line. Nails placed in the danger zone will rust and leak. Another mistake is using a woven valley method with thick architectural shingles. These shingles are not designed to be bent sharply. Woven valleys can crack down the middle over time.
Open metal valleys are generally considered the superior method for modern roofs. A W shaped piece of metal is installed in the center. The shingles overlap the edges of the metal but leave the center open. This allows debris like leaves and pine needles to wash away easily. It also prevents the friction of the water from wearing down the granules on the shingles. Failing to install a proper water and ice shield membrane under the valley metal adds another layer of risk.
Ignoring Manufacturer Guidelines
Roofing manufacturers invest millions of dollars in research and engineering. They develop specific installation guidelines to ensure their products perform as intended. These guidelines cover everything from the underlayment type to the nail pattern. Ignoring these instructions is not just a technical error; it is a warranty issue.
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Most warranties are contingent on proper installation. If a manufacturer inspects a failed roof and finds that the contractor did not follow their manual, they will void the warranty. You are left with no recourse. You cannot claim a defect in the material if the material was applied incorrectly.
This includes mixing and matching brands. A roofing system works best when all the components come from the same manufacturer. The starter strip, the underlayment, the shingles, and the hip and ridge caps are designed to be compatible. Mixing a generic underlayment with a premium shingle might save a little money, but it can void the extended system warranty. A professional contractor understands the importance of adhering to the system specifications.
Inadequate Attic Insulation
The roof works in tandem with the insulation in your attic. Insulation keeps the heat in your living space during the winter and out of it during the summer. If the insulation is insufficient, heat escapes through the ceiling and warms up the attic air. In Bentonville, this leads to a phenomenon known as ice damming.
Snow that falls on the roof melts because of the heat escaping from the house. The water runs down the slope until it reaches the eaves. The eaves are not over the living space, so they are colder. The water freezes again at the edge, forming a ridge of ice. This ice dam blocks the water behind it. As more snow melts, the water pools and backs up under the shingles.
Asphalt shingles are designed to shed water, not hold it. Standing water will seep through the nail holes and drip into the wall cavities. Proper insulation keeps the attic temperature close to the outside temperature. This prevents the snow from melting unevenly and stops ice dams before they form. A roofer who ignores the condition of the insulation is missing a key piece of the puzzle.
Neglecting Routine Maintenance
A roof is not a install it and forget it product. It requires maintenance like any other part of your home. Neglecting this maintenance accelerates the aging process. Gutters that are clogged with leaves cause water to back up onto the roof edge. This causes rot in the fascia and soffit.
Debris that accumulates on the roof, such as pine needles or branches, traps moisture. This dampness promotes the growth of moss and algae. Moss roots lift the shingles and break the adhesive seal. Overhanging tree branches can scrape the granules off the shingles during a windstorm. They also provide a bridge for squirrels and raccoons to access the roof.
Failure to inspect the pipe boots and caulking regularly leads to leaks that could have been prevented. The rubber gaskets on vent pipes dry out and crack after a few years. Replacing a ten dollar boot can save thousands in water damage repairs. Homeowners who assume their new roof needs no attention are often surprised when leaks develop prematurely.
Avoiding these common roofing mistakes requires a combination of knowledge and trust. You need to understand the basics of how a roof system functions so you can evaluate the proposals you receive. However, the most effective way to prevent early failure is to hire a contractor with a proven track record of excellence. Toro Construction brings over twenty years of experience to the roofing industry in Bentonville. We are a minority owned and family operated business that refuses to compromise on quality. We follow manufacturer guidelines strictly and treat every home as if it were our own. Our twenty year craftsmanship warranty is our promise that we do things the right way. Do not let a poor installation ruin your investment. Contact us today to discuss your roofing project and experience the difference that professional attention to detail makes.