How to Reroof with a Metal Roof
Residential and agricultural structures are typically built with common roof materials like shingles or asphalt. When traditional roofs outlive their 15– to 20-year lifespan, metal becomes an attractive and practical option for a reroofing project.
The Reroofing Process for Builders
The metal reroof process begins with many elements to ensure that the structure or existing roof can properly support metal materials. It involves careful consideration of materials and compatibility, balancing technical requirements with aesthetic considerations to ensure the new roof’s functionality and durability.
Inspect the Existing Structure
Inspecting the existing roof structure to make sure that the roof is in good condition before starting the project is the most critical step in any reroofing project. This helps identify any underlying issues with the roof’s support system. If not addressed, these problems could compromise the new roof’s stability and longevity. This is especially an issue when it comes to metal roofing because existing metal panels may have hidden corrosion or structural damage that’s not immediately visible from the surface.
If only one or two layers of the existing material remain, metal can usually be installed without costly tear-off, removal, and disposal. If the existing material is not suitable for the structure, it’s important to note that many landfills no longer accept shingles due to environmental concerns.
It is necessary to inspect the existing shingles for any deterioration or damage. If shingles are stable enough, metal reroofing can be installed with a synthetic underlayment and furring strips on top. If the shingles aren’t in a good state, removal may be necessary for repairs and to install a new metal roof over a synthetic underlayment.
Learn more about the specifications in our metal reroofing technical bulletin.
Find Out Local Codes & Regulations to Build
Before metal reroofing begins, review zoning and code restrictions to determine allowed roof coverings in the area.
A few specific restrictions apply to reroofing:
- Slope: Each roofing material has its own minimum slope requirement; for example, most asphalt shingles need at least a 2:12 pitch to function properly, and those with a low slope require specialized materials and building techniques to prevent water infiltration.
- Underlayment: The amount of underlayment layers needed may vary depending on the roof’s slope and local climate conditions.
- Roof recover: Many regulations often limit the number of recovers allowed before a complete tear-off becomes mandatory, often permitting only one recover.
- Snow load: In areas prone to heavier snowfall, they often have increased structural requirements to handle the substantial weight of the accumulated snow. Also, the choice of materials may differ as these areas need roofs that withstand harsher weather conditions.
- Water runoff: Minimum slope requirements are often in place to ensure drainage and prevent flooding.
Pick the Right Metal Panel for your Customer
Researching metal panels beforehand can help smooth out the decision process. Factors that influence metal roof choices include location, environment and climate, and personal preferences. Balancing initial costs with long-term durability is key to making a cost-effective choice.
Keep in mind that the chosen panels should work well with the roof’s slope, existing features, and any planned or future additions. Selecting the right metal roofing panels involves many factors to ensure the new roof meets today’s performance requirements.
Keeping Common Obstacles in Mind
There are several key obstacles to keep in mind before starting your metal roofing project. Anticipating common issues can help builders and contractors navigate the challenges of a reroofing project more effectively.
Expansion & Contraction of Metal
Thermal expansion and contraction aren’t commonly thought of with metal roofing, but they’re critical to remember. Improperly installed fasteners can cause the roofs to loosen over time due to temperature-related movement. In a warm climate, there aren’t as drastic temperature changes, so thermal expansion isn’t as much of an issue.
Installation Techniques
Builders typically need more education on installation techniques as metal roofs require slightly more skill than traditional roofing materials. By addressing this early on, the reroofing process can proceed more smoothly. This ensures a long-lasting and better-performing metal roof.
Disposal of Old Roof Materials
The disposal of roofing materials during a project can be challenging. They generate a substantial amount of waste that can be difficult to dispose of efficiently. Some materials may contain hazardous substances, requiring special procedures to comply with environmental regulations.
Roofing waste contributes to construction debris in landfills, and waste sites can charge a premium price for disposal. These factors make the disposal of old roofing materials a challenge as it poses both environmental and cost considerations.
Benefits of Opting for Metal Reroofing
Choosing metal for reroofing projects offers numerous benefits. They are exceptionally durable, lasting an average of 40-70 years, which is considerably longer than traditional roofing materials.
Metal roofs demonstrate excellent weather resistance and energy efficiency. They are often made from recycled materials and are fully recyclable at the end of their life cycle, unlike other materials. The longevity and efficiency of metal roofs can also increase a property’s overall value, making it a valuable investment!
Fabral’s Products for Reroofing
Fabral has many metal roof products that can ease the installation process of reroofing.
The Grandrib 3 Plus and 1 ½” SSR 150 metal panel options offer a visually appealing metal roofing material and siding solution with superior durability, longevity, and resistance to environmental elements. These panels are designed to perform at optimum levels and can go on top of traditional roofing materials.
Both panels are designed to go over furring strips for reroofing installations. The existing roof provides a stable base, and the furring strips simplify the installation process.
Let Fabral Help in the Metal Reroofing Process
Fabral’s experienced engineering team is ready to assist with any reroofing project questions. We also offer detailed installation guides, videos, technical evaluations, and installer training for professionals. We’re here to support you at every step of installing a new metal roof, whether you’re new or an experienced professional.
Learn more about Fabral’s solutions and contact a representative today!