The Basics of Metal Roofing Over Shingles
Why Consider Metal Roofing Over Shingles?
Shingles, particularly asphalt shingles, have been a popular roofing material for decades. However, their lifespan is limited, often requiring replacements every 20-30 years. Enter metal roofing. Not only does it promise longevity, often lasting 50 years or more, but it also offers a sleek appearance with a plethora of styles and colors. Moreover, metal roofing is an eco-friendly choice, being made from recycled material and being 100% recyclable at the end of its lifespan. The question is: can you have both?
The Simple Answer: Can You?
Absolutely! Metal roofing is lightweight, making it an ideal material to be installed over shingles. But, like all home projects, there are considerations to keep in mind.
Advantages of Installing Metal Roofing Over Shingles
Cost Savings
Choosing to install metal roofing over shingles can significantly save money. How? By avoiding the complete tear of the existing roof, homeowners can save on labor and disposal costs. This approach also reduces environmental waste, as old shingles often end up in landfills.
Environmental Benefits
Beyond cost savings, metal roofs are environmentally friendly. Unlike shingles, which are rarely recycled and often contribute to landfill waste, metal roofs are sustainable. They not only come from recycled materials but are also fully recyclable at the end of their life.
Key Considerations Before Installation
Local Building Regulations
Before embarking on this project, it’s crucial to check with your local building department. They’ll provide guidance on approved installation methods and ensure that the existing roof’s plywood is in good shape. This step ensures that when the metal roof is installed, the screws have a solid base to attach to.
Condition of Existing Shingles and Decking
The existing shingles and decking must be in good condition. Soft spots or rotten wood can compromise the integrity of the new metal roof. It’s essential to ensure a solid foundation for the new roofing system.
Installation Methods
Direct Installation Over Existing Shingles
One method involves laying the metal roofing directly over the existing shingles. This method is cost-effective and straightforward. However, a barrier is essential between the metal and shingles to prevent the metal from wearing due to the shingles’ granulated surface, which can expand and contract with temperature changes.
Using Furring or Lathing Strips
Another method involves using furring or lathing strips. These strips provide a flat surface for the metal roof panels, ensuring a smooth installation. This method also creates an air gap between the metal and shingle roofs, offering insulation benefits.
Answering Common Questions
Best Way to Install Metal Roofing Over Shingles
Both direct attachment and using purlins have their merits. The best method depends on individual preferences, budget, and the home’s structural integrity.
Pros and Cons of the Installation
While metal roofing offers longevity, aesthetics, and cost savings, homeowners should be aware of potential challenges, such as local building regulations and the need for regular maintenance.
The Need for Underlayment
Underlayment acts as a protective barrier, preventing shingles from wearing through the metal panels. Common underlayment options include felt, synthetic materials, or thin foil-faced insulation.
Making the Right Decision
Factors to Consider
Local climate, building regulations, and budget are all essential considerations. It’s crucial to think about the long-term benefits and potential challenges. It’s also recommended that you consult with a professional before making a decision. Their expertise can guide you through the process, ensuring a successful outcome.
Final Thoughts
Installing a metal roof over shingles is a viable option for homeowners seeking longevity, aesthetics, and cost savings. By understanding the benefits, considerations, and installation methods, homeowners can make an informed decision.
Why Choose The Roof Doctor
We’ve been in the roofing game longer than most roofs last. With our generations of experience and commitment to quality, you can trust us to get your roofing job done right, the first time. If you run into any problems or confusion regarding your roof, don’t hesitate to contact us. We’re here for any and all of your roofing needs from Vancouver to Tacoma and everywhere in between.
