Can You Install a Metal Roof Over Shingles?

In Florida’s hot, humid, and stormy climate, many homeowners are increasingly turning to metal roofing for its long-term durability and energy efficiency. One common question we hear at Triangle Roofing is: Can I install a metal roof over my existing shingles?

The short answer is yes, but there are important requirements, restrictions, and best practices to keep in mind. Let's go over what Florida homeowners need to know before choosing a metal-over-shingle roof installation—including what local building codes, insurance companies, and roofing pros look for before giving a thumbs up!

Why Metal Roofs Are Popular in Florida

Metal roofing is ideal for Florida’s extreme weather.

• Longer lifespan than asphalt shingles (40–70 years)

• Resists wind uplift during hurricanes

• Reflects heat, reducing energy costs

• Fire-resistant and low maintenance

While the initial cost is higher than shingles, metal roofing offers a better bang for your buck over time, especially if you're living near the coast.

What Is a Metal-Over-Shingle Roof Installation?

A metal-over-shingle installation is when metal panels are installed directly over your existing shingle roof without removing the old materials. This is only allowed under certain conditions and building codes.

1. Saves time and labor costs

2. Reduces landfill waste

3. Adds an extra barrier between roof and elements

But skipping the tear-off isn't always safe—or legal.

Step 1: Roof Inspection Is Required

Before a roofer can install a metal roof over shingles, a full roof inspection is necessary.

What the inspection checks for:

• Soft spots or roof leaks (especially on the plywood decking)

• Sagging or damaged roof trusses - we get up and walk your roof

• Previous repairs or weak underlayment - keep records

• Number of existing roofing layers

Your roof must be structurally sound so that screws and metal panels can hold during high winds. If there are hidden leaks or rotting wood beneath the asphalt shingles, they must be replaced before metal roofing is added.

Step 2: Check Local Building Codes

In Florida, local codes often restrict how many layers your roof can have.

Important:

• Most cities allow only two total roofing layers

• Some counties require a tear-off, even if the roof is in good shape

• Permit approval is mandatory

Under the Florida Building Code (Chapter 15, Roof Assemblies), all roofing systems—whether new installation or re-roofing—must meet rigorous standards for materials, wind loads, and structural quality. In Volusia County, local reroof inspection policy (FBC-B 110.3) may require opening or inspecting underlayment and sheathing to verify compliance, which can expose issues in overlay installations. Volusia’s low-slope roof permit guidance also mandates compliance with Sections 905 and 1507 of the FBC and applicable wind zone requirements. Many Florida roofing professionals note that the building code only permits one roof overlay before total tear-off is required.

Triangle Roofing Inc., will help you navigate permitting in Volusia, Flagler, and St. Johns Counties.

Step 3: Underlayment and Installation

Even if you keep your shingle layer, a new underlayment may still be required.

Why? Because shingle granules can damage metal panels from underneath. Also, insurance companies often require added water barriers when a metal roof is installed.

Two underlayment methods may be used:

1. Synthetic underlayment over the shingles

   With this method, a special waterproof layer (called underlayment) is rolled out over your existing shingles. This extra layer acts as a backup barrier in case water ever gets under the metal roof. It also creates a smooth surface so the metal doesn’t rub against the shingles and wear them down over time.

2. Purlin system — metal panels are installed over purlins

With this approach, thin strips of wood or metal—called purlins or battens—are installed over the shingles. The new metal panels are then attached to these strips instead of directly to the old roof. This gives the installer a flat, even surface to work on and can help improve airflow under the metal roof.

Is It Better to Remove an Old Roof? Bottom Line

Skipping the tear-off might save money—but not always. This is why you need an experienced, honest roofing contractor to advise you.

You should consider a full tear-off if:

• The shingles are more than 10–15 years old

• There’s water damage or mold

• You want to maximize wind uplift protection

• You’re doing major home renovations or selling soon

Starting fresh gives your metal roof the strongest foundation and best long-term results.

Bonus Tip: Check With Your HOA

If you live in a homeowners association (HOA), ask about any restrictions on roofing types, colors, or installation methods. Many HOAs in Florida have appearance guidelines or architectural review boards. Joe at Triangle Roofing Inc. has worked with dozens of HOA communities, like Pelican Bay Daytona Beach and Hunter's Ridge in Ormond Beach—ask us how we can help!

Final Thoughts: Is Metal-Over-Shingle Right for You?

A metal-over-shingle roof may be a smart choice if:

• Your roof is in solid structural condition

• You want a fast, eco-friendly installation

• You’ve passed local inspections and permitting

• Your HOA allows it

Otherwise, a complete roof tear-off might be the safest and most cost-effective option.

At Triangle Roofing, Inc., we bring decades of experience installing metal roofing in coastal Florida. We’ll inspect your current roof, explain your options, and make sure your installation meets code requirements, wind mitigation needs, and insurance guidelines.

Contact Joe at Triangle Roofing today for a free estimate and expert advice:

joe.delia@triangleroofingusa.com, call (386) 673-6600