Adding A Steel Roof Over Shingles: What You Need To Know
For building professionals looking to upgrade roofing systems, a common question arises: Can a metal roof be installed over shingles? The good news is — yes, it can be done under the right circumstances. Berridge Manufacturing is here to guide you through the key considerations, benefits and installation factors involved in this type of project.
We supply a wide range of metal roofing systems, from alternative batten seam panels to exposed deep-deck fastener panels. We explain how this installation decision can be strategic and how it can benefit your property.
Why Install A Metal Roof Over Shingles?
Installing a steel roof over shingles can have several benefits for your property.
Cost-Efficiency And Time Savings
One of the biggest advantages of placing a steel roof over shingles is cost savings. By avoiding the need for a full tear-off, you significantly reduce labor costs and landfill fees. This can make metal roofing more accessible for homeowners wanting to invest in longevity without breaking their budget.
Minimal Disruption
Skipping the shingle removal process speeds up the timeline of your roofing project. It’s ideal for property owners needing a fast turnaround, especially during seasons when weather delays are a risk.
Environmental Considerations
Leaving the existing asphalt shingles in place reduces the amount of roofing material that ends up in landfills. When paired with Berridge’s recyclable steel roofing systems, this becomes a much greener solution overall.
Structural Considerations: Is Your Roof A Good Candidate?
Before moving forward, it’s important to assess the condition of your current roof. While many properties qualify, there are several essential checks:
- Decking condition —The roof decking beneath the shingles must be in solid condition with no signs of rot or water damage.
- Local building codes — Some areas limit the number of roof layers allowed. In most jurisdictions, two layers are the maximum.
- Weight load capacity — While metal roofs are lighter than tile or slate, it’s still crucial to confirm that your roof can handle the added materials.
Partnering with an experienced roofing contractor will help you confirm these factors. At Berridge Manufacturing, we also recommend consulting with your local permitting office to ensure compliance.
Installation Best Practices For Metal Over Shingles
The process for installing metal roofing over shingles is thorough and precise. Your roofing contractor can go over specific procedures, but our team details the general process.
Furring Strips Or Underlayment
To prevent uneven surfaces or contact between the metal panels and abrasive shingle granules, many installers use purlins or furring strips. These systems create a ventilation gap and a smooth surface for metal panel installation. Alternatively, a synthetic underlayment can be applied directly over the shingles to provide a moisture barrier and protect the metal from wear.
Panel Type Selection
When considering a steel roof over shingles, standing seam panels are one of the best choices. These panels provide a sleek finish, minimal visible fasteners and exceptional water resistance — making them an ideal match for retrofit projects.
Fastener Type And Placement
Proper fastener placement is critical to long-term performance. Direct-to-deck fasteners or clip systems must be installed with precision to ensure water tightness and allow for metal expansion and contraction.
A Smart Upgrade With Long-Term Benefits
Upgrading your building with a steel roof over shingles can be a strategic decision — one that saves time, reduces costs and boosts energy efficiency. As long as the existing roofing structure is sound and the right installation methods are used, this option offers lasting protection and a polished look that elevates your entire property.
At Berridge Manufacturing, we specialize in high-performance metal roofing systems designed for both new construction and retrofit applications. Contact Berridge today to explore panel options that suit the needs of your space.
