Installing a metal roof has become increasingly popular in recent years, thanks to its modern appearance, durability, and long lifespan compared to traditional shingle roofs. With its surge in popularity, there has also been a rise in demand for professional metal roof installations. However, the installation process requires specialized skills, knowledge, and meticulous attention to detail.
Improper installation can significantly reduce the lifespan of a metal roof and may even cause damage to the entire structure, void warranties, and lead to costly repairs. At The Real Metal Roofing Company, we take pride in educating our customers and fellow contractors on avoiding these errors to ensure long-lasting, durable metal roofing solutions.
In this article, we will explore the top eight mistakes commonly made during metal roof installations and how to avoid them. By the end of this guide, you’ll have a deeper understanding of how to ensure a successful and effective installation, whether you’re a homeowner seeking to install a metal roof or a contractor performing the work.
1. Incorrect Measurements
One of the most common and costly mistakes during a metal roof installation is incorrect measurements. Miscalculations can result in ordering panels that are either too long or too short, causing significant delays and additional expenses. This can also compromise the effectiveness of the metal roofing system, leading to structural vulnerabilities.
Why Accurate Measurements Matter
Taking precise measurements is crucial because metal roofing panels are often custom-ordered to fit the specific dimensions of a roof. Any mistake in measurement can result in gaps, improper coverage, and a compromised roofing system.
At The Real Metal Roofing Company, we always recommend conducting a thorough field measurement on-site before ordering any materials. Relying on blueprints or plans before a building is constructed can lead to inaccurate sizing.
Pro Tip: Use a reliable roofing calculator and double-check your measurements before finalizing your order. Pay attention to overhangs, roof pitch, and any architectural details that may affect panel sizing.
2. Choosing the Incorrect Metal Roofing Panel
Selecting the right type of metal roofing panel for your specific project is essential. Each roofing panel is designed with a unique profile and purpose, depending on the roof’s pitch, location, and intended functionality.
Understanding Roof Pitch and Panel Selection
Roof pitch determines which type of metal roofing panel is appropriate. For example, certain metal panels are designed to perform best on low-slope roofs, while others are better suited for steep slopes.
- Minimum Pitch of 1” in 12” to less than 3” in 12”: This is considered a low-slope condition. In these cases, we recommend using a standing seam panel with a 2” mechanical seam.
- Roof Pitch of 3” in 12” or greater: For steeper roof pitches, you have a wider range of metal roofing options. Panels like 7/8” corrugated, PBR panels, Western Rib, or Western Lock standing seam panels are ideal for steeper roofs.
Choosing the incorrect panel type for your roof pitch can lead to water leaks, poor performance in extreme weather, and ultimately, reduced roof longevity.
Pro Tip: Consult with experienced metal roofing professionals, such as the team at The Real Metal Roofing Company, to ensure you’re selecting the correct panel for your roof.
3. Installing Fasteners Incorrectly
One of the most frequent causes of metal roof leaks is improperly installed fasteners. Fasteners are responsible for securing metal panels to the roof deck, and if they are either over-tightened or under-tightened, issues will arise.
Proper Fastener Installation
Fasteners should be screwed in with the appropriate amount of pressure.
- Over-tightening: This can cause the washer to be off-center, potentially damaging the roofing material or compressing the fastener too much, creating gaps that lead to leaks.
- Under-tightening: This occurs when the fasteners are too loose, preventing the gasket from making a secure seal against the surface. Under-tightening allows water to seep under the fastener, causing leaks.
Pro Tip: Use the proper tools and torque settings when installing fasteners to ensure they’re seated correctly. Ensure that the washers are centered and compressed just enough to form a watertight seal.
4. Oil Canning
Oil canning is the visible waviness or rippling that can occur in the flat areas of metal panels. It’s a common issue in standing seam metal roofing and flat wall panels, but it can also happen with other types of metal roofing. While oil canning is often a result of the natural expansion and contraction of metal, improper installation techniques can make it more pronounced.
Preventing Oil Canning
To minimize the appearance of oil canning, consider the following steps:
- Use Stiffening Ribs or Striations: Adding these features to flat metal panels helps control the natural expansion and contraction of the metal, reducing visible waviness.
- Proper Fastening Techniques: Incorrectly placed fasteners or clips can put uneven pressure on the panels, causing stress and contributing to oil canning. Ensure clips fit properly into the seams of the panels without forcing them out of place.
Pro Tip: Select panels that are designed to minimize oil canning, and be sure that your installation crew follows best practices to avoid this common aesthetic issue.
5. Underlayment Mistakes
Skipping or improperly installing roof underlayment is a significant mistake that can lead to moisture issues and potential damage to the structure. Underlayment serves as a critical barrier between the roof deck and the metal panels, protecting against water infiltration and condensation.
Choosing the Right Underlayment
In most cases, building codes require underlayment, and they often specify the type of underlayment needed. Using the wrong underlayment or omitting it altogether can void warranties and leave your roof vulnerable to water damage.
Felt underlayment and synthetic underlayment are the two most common options, with synthetic materials offering superior protection against moisture.
Pro Tip: Always follow local building codes and manufacturer recommendations for underlayment. At The Real Metal Roofing Company, we recommend using high-quality synthetic underlayment for its enhanced durability and water-resistant properties.
6. Incorrect Sealant Application
Sealants play an essential role in metal roofing systems by preventing water, dirt, and other elements from entering the roof structure. However, improper sealant application or using the wrong type of sealant can compromise the integrity of the roof.
Sealant Best Practices
When applying sealant, it’s important to:
- **Use a sealant specifically designed for metal roofing: Standard caulking products may not adhere properly to the painted surface of metal panels.
- Ensure flexibility: The sealant should be flexible enough to expand and contract with the metal as temperatures fluctuate, without breaking the seal.
Pro Tip: Always use sealants that are compatible with metal roofing materials and ensure they are applied correctly to all seams and joints.
7. Improper Flashing Installation
Flashing is a vital component of any roofing system, as it prevents water from entering at roof penetrations or joints. Improper flashing installation can lead to significant water damage.
Importance of Proper Flashing
Areas around chimneys, skylights, ventilation ducts, and roof valleys require correctly installed flashing. When flashing is not properly sized or installed, it allows water to bypass the barrier and seep into the roofing structure. Additionally, flashing seams must be carefully sealed to ensure water flows over the flashing and not underneath it.
Pro Tip: Use high-quality flashing materials that are compatible with your roofing system. At The Real Metal RoofingCompany, we ensure that flashing is properly installed around all roof penetrations to prevent leaks.
8. Lack of Metal Roof Installation Experience
Not all roofing contractors have experience installing metal roofs. Metal roofing installations are significantly different from traditional shingle roof installations, and specialized training is required to ensure proper installation.
Hiring Qualified Contractors
If you’re a contractor, only perform metal roof installations if you’ve received the necessary training and feel confident in your ability to complete the job correctly. If you’re a homeowner, it’s crucial to hire a qualified contractor with experience in metal roofing. Ask potential contractors the right questions and verify their past metal roofing projects.
Pro Tip: Always choose a contractor with specific experience in metal roofing installations. At The Real Metal Roofing Company, our team of experts has extensive experience and training in metal roof installations, ensuring that your roof is installed correctly the first time.
Essential Supplies for Metal Roof Installation
To avoid common mistakes and ensure a smooth installation, it’s important to have the right supplies on hand. Below is a list of essential supplies you’ll need for a successful metal roofing project:
- Metal Roofing Panels: Choose the appropriate style and material for your roof’s pitch and environmental conditions.
- Underlayment: Always use high-quality moisture-protective underlayment systems to prevent water damage.
- Foam Closures: Prevent elements like rain, wind, and insects from entering under the ridge cap and panels.
- Trim and Flashing: Ensure all roof edges, penetrations, and joints are properly protected from water infiltration.
- Pipe Flashing: Securely seal around small ventilation pipes to prevent leaks.
- Butyl/Sealant Tape: Use for sealing metal panels, roof vents, and pipe flashing.
- Fasteners: Choose the correct type of fasteners for your roofing system to ensure proper mechanical attachment.
Conclusion
By avoiding these common mistakes and following best practices, you can ensure a successful and long-lasting metal roof installation. Whether you’re a homeowner looking to have a metal roof installed or a contractor seeking to improve your skills, understanding these crucial details will help you achieve a high-quality outcome.
At The Real Metal Roofing Company, we pride ourselves on providing expert metal roof installation services. Our experienced team is dedicated to ensuring that every project is completed with precision and attention to detail. With our expertise and high-quality materials, you can trust that your metal roof will stand the test of time.
For more information or to schedule a consultation, contact The Real Metal Roofing Company today. Let us help you with your next metal roofing project, ensuring a flawless installation and years of durability and protection.