Ever wondered if you can put a modern metal roof over your old shingles? It sounds simple, but are there hidden challenges?

If you’re thinking about a roofing upgrade without removing your existing shingles, you’re not alone. Installing a metal roof over shingles can save money and time. However, it’s important to understand what this involves.

This guide will explain the benefits and drawbacks of putting a metal roof over shingles. Whether you’re a homeowner looking for a durable roof or just curious, this guide will give you the information you need to make a smart decision.

Understanding Metal Roofing

Metal roofing is popular for its durability, energy efficiency, and low maintenance. This section covers the types, materials, and benefits of metal roofing.

Types of Metal Roofing

Standing Seam

  • Description: Vertical panels with raised seams that lock together.
  • Advantages: Durable, leak-resistant, and adaptable to weather changes.

Metal Shingles

  • Description: Mimics traditional shingles but offers metal’s benefits.
  • Advantages: Classic look, durable, and energy-efficient.

Corrugated Metal

  • Description: Overlapping panels with a wavy pattern.
  • Advantages: Affordable, easy to install, excellent water runoff.

Materials Used

Steel

  • Description: Common and affordable, often coated for protection.
  • Benefits: Strong and cost-effective.

Aluminum

  • Description: Lightweight and corrosion-resistant.
  • Benefits: Ideal for coastal areas, lightweight.

Copper

  • Description: Distinctive appearance, develops a protective green patina.
  • Benefits: Extremely durable and long-lasting.

Benefits of Metal Roofing

Durability

  • Explanation: Withstands extreme weather, rust-resistant, and long-lasting.

Energy Efficiency

  • Explanation: Reflects heat, reducing cooling costs. Often has energy-efficient coatings.

Low Maintenance

  • Explanation: Minimal upkeep, easy debris removal.

Environmental Impact

  • Explanation: Made from recycled materials, fully recyclable.

Fire Resistance

  • Explanation: Non-combustible, excellent fire resistance.

This overview introduces metal roofing, its types, materials, and key benefits, setting the stage for evaluating its application over existing shingles.

Can You Put a Metal Roof Over Shingles?

Yes, you can put a metal roof over shingles, but there are several important considerations to keep in mind before proceeding with this method.

Why It’s Possible

Layering Benefits

  • Support: Old shingles can provide extra cushion and insulation.
  • Savings: Not removing old shingles saves time and money.

Extra Insulation

  • Better Efficiency: The additional layer may improve your home’s insulation and reduce energy costs.

Considerations and Challenges

Shingle Condition

  • Inspection: Old shingles must be in good shape. Damaged ones need fixing or replacing.

 Roof Deck and Ventilation

  • Support: The roof deck must be strong enough for the metal roof.
  • Ventilation: Proper air flow is crucial to prevent moisture problems.

Building Codes

  • Local Rules: Check local codes and regulations.
  • Permits: You might need a permit for the installation.

Appearance and Function

  • Looks: Make sure the new roof matches your home’s look.
  • Performance: Additional layers could affect water drainage and roof performance.

Installing a metal roof over shingles can be a smart and cost-effective choice if the existing shingles are in good condition and the installation is done correctly. Ensure structural support, proper ventilation, and compliance with local rules for success.

Cost Considerations

When thinking about installing a metal roof over shingles, keep these factors in mind to make an informed decision.

1. Cost of Metal Roofing

Steel Roofing: $3.00 to $5.00 per square foot

  • Total Cost: $6,000 to $10,000 for a 2,000 square foot roof.

Aluminum Roofing: $4.00 to $6.00 per square foot

  • Total Cost: $8,000 to $12,000 for a 2,000 square foot roof.

Copper Roofing: $10.00 to $15.00 per square foot

  • Total Cost: $20,000 to $30,000 for a 2,000 square foot roof.

2. Cost of Installation

  • Labor Costs: $1.00 to $3.00 per square foot
  • Total Cost: $2,000 to $6,000 for a 2,000 square foot roof.

3. Savings Compared to Removing Shingles

  • Shingle Removal: $1.00 to $2.00 per square foot
  • Total Cost: $2,000 to $4,000 for a 2,000 square foot roof.
  • Disposal Fees: $0.50 to $1.00 per square foot
  • Total Cost: $1,000 to $2,000 for a 2,000 square foot roof.

Installing existing shingles could save you $3,000 to $6,000.

4. Long-Term Savings

  • Energy Efficiency: Metal roofs can reduce cooling costs by 10-25%, potentially saving $200 to $400 annually.
  • Durability: Metal roofs last 40-70 years, while asphalt shingles last 15-30 years, meaning fewer replacements.

5. Additional Costs

  • Underlayment: $0.50 to $1.00 per square foot
  • Total Cost: $1,000 to $2,000 for a 2,000 square foot roof.
  • Ventilation: $500 to $1,500.
  • Permits: $100 to $500.

Summary

Total Estimated Costs for Metal Roof Over Shingles (2,000 square foot roof):

  • Metal Roofing: $6,000 to $30,000
  • Installation: $2,000 to $6,000
  • Additional Costs: $1,600 to $4,000

Total Range: $9,600 to $40,000

Installing a metal roof over shingles can save on removal and disposal costs, but budget for installation and other expenses. Consider both immediate and long-term costs to see if it fits your financial goals.

Alternatives to Installing Metal Roof Over Shingles

1. Removing Old Shingles and Installing a New Roof

  • Benefits: Fresh start, optimal performance, improved ventilation.
  • Costs: $3,000 – $6,000 for a standard 2,000 sq ft roof.

2. Installing a New Roof Over Existing Shingles with Different Materials

  • Options: Asphalt shingles ($2.00 – $3.50/sq ft), Wood shingles.
  • Benefits: Cost savings, simpler installation.
  • Costs: $4,000 – $7,000 for 2,000 sq ft.

3. Overlaying with a Lightweight Roofing Material

  • Options: Synthetic roofing, Rubber roofing.
  • Benefits: Reduced weight, durable.
  • Costs: $3.00 – $5.00/sq ft, $6,000 – $10,000 for 2,000 sq ft.

4. Roof Coatings

  • Types: Reflective, Sealer coatings.
  • Benefits: Cost-effective, easy to apply.
  • Costs: $1.00 – $2.00/sq ft, $2,000 – $4,000 for 2,000 sq ft.

5. Green Roofing Solutions

  • Types: Vegetative roofs, Green roof systems.
  • Benefits: Environmental impact, aesthetic appeal.
  • Costs: $10.00 – $20.00/sq ft, $20,000 – $40,000 for 2,000 sq ft.

6. Consult with a Roofing Professional

  • Benefits: Expert advice, accurate estimates.
  • Costs: $100 – $500 for consultation.

Alternatively, you may opt for lightweight roofing materials that offer similar benefits

Useful Resources:

WikiHow: How to Install Metal Roofing over Shingles

AD: Installing a Metal Roof Over Shingles

Conclusion

Installing a metal roof over existing shingles can be efficient and cost-effective if the old shingles are in good condition. This method saves on removal costs and offers durability and energy efficiency. 

However, consider roof deck support, ventilation, and local building codes. Alternatives include removing old shingles, using lightweight materials, or applying roofing coatings. Consult with a roofing professional to make the best decision for your home.