Installing Metal Roofing Over Existing Asphalt Shingles

For many homeowners in New York, upgrading to a more durable and energy-efficient roofing system is a top priority. Metal roofing has grown in popularity due to its longevity, sleek appearance, and ability to withstand severe weather. One of the most frequently asked questions by homeowners is: Can metal roofing be installed over existing asphalt shingles? The answer is yes—with some important considerations.

In this article, we'll explore the benefits, challenges, and key steps of installing metal roofing over asphalt shingles, with guidance from an expert New York Roofing Company.

Why Consider Metal Roofing?

Before diving into the installation process, it's important to understand why metal roofing is a top choice among property owners:

Longevity: Metal roofs can last 40–70 years, compared to 15–30 years for asphalt shingles.

Energy Efficiency: Metal reflects solar radiant heat, reducing cooling costs by up to 25%.

Durability: Withstand high winds, hail, heavy snow, and fire.

Sustainability: Often made from recycled materials and fully recyclable at end of life.

Low Maintenance: Less prone to issues like mold, rot, and algae growth.

Professional New York roofing contractors often recommend metal roofing as a smart long-term investment, especially in climates like New York that experience all four seasons.

Can Metal Be Installed Over Asphalt Shingles?

Yes, it is possible—and often advantageous—to install metal roofing over existing asphalt shingles. This process is called a “roof overlay” or “re-roofing.” Instead of tearing off the old shingles, a metal roof is installed directly over them.

This approach is legal in many areas, including New York, provided the local building codes allow it and the existing roof structure is in good condition. A knowledgeable New York Roofing Company can inspect your roof and advise if your home is a candidate for this method.

Benefits of Installing Metal Over Asphalt

1. Cost Savings

By skipping the tear-off process, homeowners save significantly on labor and disposal fees. Tearing off shingles can add thousands to the overall cost.

2. Reduced Installation Time

Overlay installations are quicker, meaning your home is protected faster—especially important when weather is unpredictable.

3. Less Environmental Impact

Keeping the old shingles in place reduces landfill waste. Metal roofing itself is recyclable, making this a greener option overall.

4. Added Insulation

The old asphalt shingles can add a small insulation buffer, improving energy efficiency and noise reduction.

For these reasons, roofing services near me may recommend this option to homeowners looking for both value and performance.

Key Considerations Before Installing Metal Over Shingles

While there are advantages, this method isn’t suitable for every roof. Here are some things New York roofing contractors will evaluate:

1. Number of Shingle Layers

Most building codes allow no more than two layers of roofing. If your roof already has two or more layers, a complete tear-off is required.

2. Roof Decking Condition

The decking underneath your shingles must be solid. If there's any sagging, rot, or water damage, overlaying with metal could worsen the issue.

3. Ventilation

Proper attic ventilation is essential to prevent moisture buildup and heat retention. Your roofer may need to upgrade vents during installation.

4. Flashing and Trim Details

To ensure weather-tightness, flashing around chimneys, valleys, and skylights must be properly addressed. Ignoring these areas can lead to leaks.

Partnering with a certified New York Roofing Company ensures all these factors are professionally evaluated before installation begins.

Installation Process

Here's what to expect when installing metal roofing over asphalt shingles:

Step 1: Roof Inspection

The contractor performs a thorough assessment of the roof's condition, checking for soft spots, structural damage, and ventilation issues.

Step 2: Preparing the Surface

Roofers may install a synthetic underlayment or insulation layer over the shingles to provide a smooth surface and extra moisture protection.

Step 3: Installing Furring Strips (Optional)

In some cases, furring strips (wooden battens) are installed to create an air gap between the metal and shingles, allowing moisture to escape and preventing heat buildup.

Step 4: Laying Metal Panels

Metal panels (typically steel, aluminum, or copper) are carefully aligned and fastened to the roof deck or furring strips.

Step 5: Sealing Edges and Flashing

Contractors install new flashing and ridge caps to create a weatherproof seal around all roof penetrations and edges.

Step 6: Final Inspection

After installation, the roof is inspected for quality, alignment, and seal integrity. A reputable New York Roofing Company will provide warranties on both labor and materials.

Cost Considerations

The cost of installing metal roofing over asphalt shingles varies depending on several factors:

Roof size and complexity

Type of metal used (steel, aluminum, standing seam, etc.)

Additional materials (underlayment, insulation, flashing)

Labor rates in your area

On average, expect to pay between $8,000 and $20,000 for a metal overlay installation. Get estimates from multiple New York roofing contractors to ensure competitive pricing and service.

Common Myths About Metal Over Shingles

Myth 1: It Makes Your House Noisy

Modern metal roofs are installed with insulation and underlayment, greatly reducing noise from rain or hail.

Myth 2: It Traps Moisture

When properly installed with ventilation and drainage, metal roofing helps reduce moisture, not increase it.

Myth 3: It Looks Industrial

Metal roofs come in a wide range of styles, colors, and finishes—many designed to mimic traditional shingles or tiles.

Consult a trusted provider of New York Roofing services to learn more about aesthetic options that suit your home.

Conclusion

Installing metal roofing over asphalt shingles is a cost-effective and eco-friendly way to upgrade your roof. However, it requires professional planning and skilled installation to ensure long-term performance and compliance with local codes.

Whether you're replacing a worn-out asphalt roof or simply want to improve energy efficiency and durability, the team at your local New York Roofing Company can help. Their certified New York roofing contractors provide expert advice, high-quality workmanship, and tailored solutions.

Looking for roofing services near me? Choose a roofing provider with experience in metal roof overlays to protect your home for decades to come.