Top 5 Reasons you should NOT Install Metal Roofing Over Shingles
As a homeowner in Crossville or elsewhere in Tennessee, you may be considering installing a metal roof over your existing shingles. While this might seem like a convenient and cost-effective solution, there are several important reasons why this approach can lead to problems down the road. At Jeff Woods Construction, we've seen the consequences of these installations firsthand throughout our 25+ years of roofing experience in the Upper Cumberland region.
1. Hidden Damage Remains Undetected
When you install metal roofing directly over existing shingles, you miss the opportunity to identify and address underlying damage. Water leaks, rotted wood, or structural issues can continue to worsen beneath your new metal roof, potentially leading to more extensive and expensive repairs in the future.
Many homeowners don't realize that signs of roof damage might be visible on your shingles but completely hidden once covered with metal. Our team always performs thorough inspections to identify these issues before they become major problems.
2. Added Weight Stresses Your Home's Structure
A metal roof installed over existing shingles adds significant weight to your home's structure. Your house was likely designed to support a single layer of roofing material, not multiple layers. This additional weight can potentially:
Stress roof trusses and rafters
Cause sagging in your roofline
Lead to structural damage over time
Violate local building codes in Crossville and surrounding areas
As we discuss in our guide on how often to replace a roof in Crossville, TN, proper installation is crucial for ensuring your roof's lifespan and performance.
3. Trapped Moisture and Reduced Ventilation
Proper ventilation is essential for any roofing system. When metal roofing is installed over shingles, moisture can become trapped between the layers. This creates the perfect environment for:
Mold and mildew growth
Wood rot in your roof decking
Decreased energy efficiency
Reduced lifespan of your new metal roof
Our exceptional roofing service in Crossville always prioritizes proper ventilation to prevent these issues.
4. Uneven Surface Leads to Installation Problems
Asphalt shingles create an uneven surface for metal roof installation. This can result in:
Visible waviness in your metal panels
Improper sealing between panels
Increased risk of leaks during Tennessee's heavy rainfalls
Fasteners that work loose over time due to thermal expansion
For homes throughout Middle Tennessee, professional installation by experienced contractors like our team at Jeff Woods Construction ensures these problems are avoided.
5. May Void Manufacturer Warranties
Perhaps most concerning is that many metal roofing manufacturers specifically exclude coverage for systems installed over existing shingles. This means that if problems develop, you could be left without warranty protection for your significant investment.
At Jeff Woods Construction, we ensure all our roofing installations meet manufacturer specifications to maintain full warranty coverage for our customers in Crossville, Cookeville, Knoxville, and throughout our service area.
The Better Alternative: Complete Roof Replacement
Instead of installing metal over shingles, we recommend a complete tear-off and replacement. This approach allows us to:
Inspect and repair any damaged roof decking
Install proper underlayment and moisture barriers
Ensure correct flashing around chimneys, vents, and other penetrations
Provide a clean, smooth surface for your new metal roof
Maintain full manufacturer warranties
While a complete replacement might cost more initially, it provides greater long-term value and peace of mind for homeowners throughout East and Middle Tennessee.
Transform Your Home with Proper Metal Roofing Installation
If you're considering a metal roof for your home in Crossville or the surrounding areas, trust the experts at Jeff Woods Construction to do the job right. Our experienced team understands the unique roofing challenges in Tennessee's climate and will ensure your new roof is installed correctly.
Don't compromise on something as important as protecting your home. Contact us today for a free inspection and consultation to discuss the best roofing options for your specific needs.
Looking to enhance your entire outdoor living space? Check out our custom deck ideas for East and Middle Tennessee and outdoor shading solutions to create the perfect backyard retreat.
Contact us at (931) 787-7715 or visit our showroom at 123 Interchange Drive, Crossville, Tennessee 38571 to discuss your roofing needs.
