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How to Install Metal Roofing Over Shingles: A Step-by-Step Guide!

How To install metal roofing over shingles, first check local building codes and then install furring strips to create a solid base. Ensure the roof structure can support the additional weight of the metal.

Metal roofing offers a durable and long-lasting alternative to traditional roofing materials. Many homeowners opt for metal roofing due to its energy efficiency, longevity, and modern appearance. Installing metal roofing over existing shingles can be a cost-effective and time-saving option, eliminating the need for a complete tear-off.

This method also adds an extra layer of insulation, improving the home’s energy performance. However, the success of this installation hinges on careful planning, adherence to building codes, and proper execution. It is essential to assess the current roof’s condition, as any underlying issues might need addressing before the metal roofing installation begins.

How to Install Metal Roofing Over Shingles: A Step-by-Step Guide


Assessing Your Roof Suitability

Before you dive into the process of installing metal roofing over your existing shingles, it’s crucial to conduct a thorough assessment of your roof’s suitability for such a project. Ensuring that your current roof can support the new material, complies with local regulations, and is in adequate condition are all steps that cannot be overlooked. Proceeding without this due diligence could lead to significant issues, both structurally and legally. Let’s explore the critical areas to evaluate:

Check The Condition Of Existing Shingles

Determining the condition of your current shingles is the first step in assessing whether your roof is a good candidate for a metal roofing upgrade. Look for signs such as:

  • Curling or buckling shingles: This may indicate underlying issues like poor ventilation or roof deck damage.
  • Missing shingles: Gaps in shingle coverage can compromise the integrity of the roofing structure.
  • Moisture damage or mold growth: These problems often signal trapped moisture and can affect the roof’s foundation.

A roof with minor issues may still be suitable, but significant damage often requires repair before proceeding with metal roofing installation.

Evaluate The Roof Structure And Frame

The existing roof’s structure and frame must support the additional weight and stress from the new metal roofing. A professional assessment should include:

  1. Inspecting the truss system or rafters for integrity and strength.
  2. Checking for sagging or signs of structural weakness.
  3. Verifying adequate spacing and ventilation to prevent condensation under metal roofing.

Should any red flags arise, you may need to reinforce or repair the roof framing before installing the metal panels.

Confirm Local Building Codes And Permits

Adhering to local building codes is not just a formality—it’s a crucial step to ensure the legality and safety of your roofing project. Investigate:

Checklist Item Description
Permit requirements: Some jurisdictions may require a permit for roofing installations, even if the work is done over existing materials.
Code specifications: Determine the load-bearing capacity requirements, fire ratings, and other specifications your new metal roof must meet.
Installation practices: Local codes may dictate installation methods that influence the longevity and performance of your new roof.

Securing the necessary permits and adhering to code requirements will prevent costly mistakes and ensure a worry-free roofing process.

How To Prepare For Metal Roofing Installation

Embarking on a journey to upgrade your roof with metal panels requires meticulous preparation. It’s essential to ensure a smooth, efficient installation and long-term durability. Let’s dive into the critical steps to prepare for the transition from shingles to a sleek, resilient metal covering.

Clearing The Roof Surface

  • Remove Debris: Start by removing debris such as leaves, twigs, and dust to provide a clean working surface.
  • Inspect for Damage: Check the old shingle roof for damaged areas or structural weaknesses that need addressing.
  • Repair if Necessary: Any compromised sections of the roof must be repaired prior to metal roofing installation to ensure structural integrity.

Installing Appropriate Underlayment

Synthetic Underlayment Installation serves as the foundation for your metal roofing. It provides an extra barrier against moisture and ensures longevity. Correctly installing an underlayment involves:

  1. Laying out the underlayment flat across the roof, starting from the edge.
  2. Fastening the underlayment according to the manufacturer’s recommendations, typically with cap nails or staples.
  3. Ensuring that seams are overlapped by at least 6 inches to prevent leaks.

Ensuring Adequate Ventilation

Proper ventilation is crucial for preventing moisture buildup that can lead to mold, rot, and diminished insulation effectiveness. Proper roof ventilation systems may include:

Ventilation Type Location Purpose
Ridge Vents Along the peak of the roof Allow hot air to escape from the attic
Soffit Vents Under the roof overhang Draw cool air into the attic
Gable Vents On the exterior wall Assist with cross-ventilation

Check existing vents to make sure they are clear and operational. Consider adding additional ventilation if current systems are inadequate.

Detailed Guide To Installing Metal Roofing

Deciding to upgrade to a metal roof offers numerous benefits, including longevity, durability, and efficiency. For homeowners seeking to retrofit their existing shingled roofs, the prospect of installing metal roofing over shingles can be enticing due to its cost-effectiveness and straightforward process. Our Detailed Guide to Installing Metal Roofing aims to provide you with comprehensive steps to ensure seamless installation, enhancing your home’s aesthetic and functional appeal.

Measuring And Cutting Metal Panels

The success of your metal roofing installation hinges on precise measurements and cuts. Before beginning, measure the roof to determine the amount of metal roofing material needed. Do this by calculating the length and width of each roof section and adding an extra couple of inches for overhang.

  1. Gather all necessary tools: measuring tape, metal snips, or a cutting tool suitable for metal panels.
  2. Measure your panels: based on the dimensions of your roof segments, taking into account the specific overlap recommendations from the manufacturer.
  3. Cut your panels: ensure each piece is accurately cut to size, with edges smooth to prevent improper seams or potential injury during installation.

How To Install Metal Roofing Over Shingles: A Step-by-step Guide

With measurements in hand and materials prepared, the actual installation can commence. However, before laying down the first panel, install a layer of roofing underlayment for additional protection against moisture and to create a more even surface over the shingles.

  1. Start at the edge: Begin by attaching the edging trim along the roof’s eaves and rakes.
  2. Lay the underlayment: Roll out the underlayment horizontally, starting from the bottom edge of the roof and working your way up, overlapping each layer by at least six inches.
  3. Place the first panel: Align it properly ensuring it hangs over the roof edge by about an inch or as specified by your metal roofing supplier.
  4. Secure the panel: Follow the manufacturer’s guidelines for screw placement, usually at the panel’s ridges.
  5. Overlap panels: Continue laying panels, ensuring each new one overlaps the previous one as instructed by the manufacturer.
  6. Seal seams and edges: Apply sealant where panels overlap and along the edges where trim is installed for waterproofing.

Securing Panels And High-wind Considerations

In areas prone to high winds, securing metal panels correctly becomes even more crucial to prevent damage or detachments. Use screws specifically designed for metal roofing, and fasten them into the building’s framing structure, not just the existing shingle layer.

  • Check local building codes: Ensure your installation complies with any high-wind specifications.
  • Use appropriate hardware: Opt for screws with neoprene washers to create a weather-tight seal.
  • Enhance strength at the edges: Edges and corners are particularly susceptible to wind uplift, so extra fasteners may be necessary in these areas.
  • Consult a professional: If unsure about the requirements or proper installation techniques, consult a professional roofer with experience in metal roofing in high-wind zones.

Seal And Weatherproof Your Metal Roof

Ensuring your metal roof remains steadfast against the elements is crucial for long-term durability and protection of your property. A well-sealed and weatherproofed metal roof stands as a bastion against rain, snow, and wind. Correctly applying sealant and installing flashing and trim are non-negotiable steps in this process. By adhering to these protective measures, you safeguard your home and extend the lifespan of your newly installed metal roofing over shingles.

Applying Sealant On Panels And Edges

Sealant application is a vital step in metal roof installation. It ensures no water can penetrate and cause damage to the underlayment. Follow these steps to apply sealant properly:

  • Clean the surface – Remove any debris or dust from the metal panels and edges where the sealant will be applied.
  • Choose the right sealant – Opt for a high-quality, UV-resistant sealant that is compatible with metal roofing materials.
  • Apply the sealant – Use a caulking gun to apply the sealant along the panel edges, at the seams, and around any penetrations, such as vents or pipes.
  • Smooth the sealant – Ensure an even spread of the sealant with a putty knife or your finger covered in soapy water to prevent sticking.

Remember to let the sealant dry according to the manufacturer’s instructions before proceeding with any further work.

Installing Flashing And Trim

Flashing and trim installation is critical for preventing water ingress where the roof meets other surfaces. These components channel water away from vulnerable areas such as the chimney, valleys, and roof edges. Here’s how to install flashing and trim correctly:

  1. Measure and Cut – Measure the areas where flashing and trim are required and cut the materials to fit these dimensions precisely.
  2. Secure the flashing – Attach the flashing to the roof with roofing screws, ensuring each screw has a neoprene washer for an additional seal.
  3. Seal the edges – After securing the flashing, apply sealant along the edges to prevent any water from getting behind the flashing.
  4. Install trim pieces – Fit trim around the perimeter of the roof, at the eaves, and along the ridges. Each piece should overlap the previous one to provide an effective barrier to water.

It’s important that every screw and joint is sealed properly to maintain the integrity of the roof’s weatherproofing system.

Installation Checklist for Flashing and Trim
Step Details Materials Needed
1. Measure and Cut Take precise measurements for an accurate fit. Metal Flashing, Trim Pieces, Measuring Tape, Metal Snips
2. Secure the Flashing Use screws with washers to attach flashing to the roof. Roofing Screws, Neoprene Washers
3. Seal the Edges Apply a bead of sealant along the edges of the flashing. Sealant, Caulking Gun
4. Install Trim Overlap trim pieces for proper water runoff. Trim Pieces, Fasteners

By systematically following these steps and using the right materials, your metal roof will be well-protected against the elements, ensuring peace of mind and a solid return on your investment.

Maintenance Tips For Your New Metal Roof

After marvelling at your gleaming new metal roof safely installed over old shingles, it’s vital to switch focus to ongoing care. Maintenance for your new metal roof ensures longevity and consistent protection for your home. Be proactive in the upkeep of your new investment, and you’ll enjoy the rewards of a robust and enduring roof. Let’s guide you through the essential maintenance tips to keep your metal masterpiece in pristine condition.

Cleaning And General Upkeep

Maintaining the sparkle on your new metal roof is not just about aesthetics; it’s about long-term performance. Here are some bulletproof strategies for cleaning and general maintenance:

  • Debris Removal: Keep the surface free from leaves, branches, and other debris. Use a soft broom or brush to gently sweep them away.
  • Wash Regularly: Use a garden hose to rinse your roof, keeping it clear of dirt and grime that can accumulate over time. A mild detergent mixed with water can be used for more stubborn dirt.
  • Avoid Harsh Chemicals: Never use aggressive chemical cleaners; they can damage the coating and compromise the metal.
  • Trim Overhanging Branches: Prevent roof scratches and the accumulation of debris by keeping nearby trees trimmed.
  • Protective Coatings: Check if your metal roofing manufacturer suggests any specific protective coatings, and apply them as instructed.

When To Inspect And Potential Issues To Watch For

Routine inspections are crucial for catching smaller issues before they escalate. Follow this inspection timetable and keep an eye out for the following potential issues:

Inspection Frequency Potential Issues
Bi-Annually: Check for sealant failures, corrosion, or metal fatigue around edges, seams, and fasteners.
After severe Weather: Look for dents, punctures, or scratches caused by storm debris or hail.
Seasonal: Make sure gutters and downspouts aren’t clogged with leaves, which can lead to water accumulation.

Keep special watch for signs of rust, especially in areas where the metal might have been cut during installation. If you spot minor corrosion, address it immediately with a matching touch-up paint recommended by your roof manufacturer. This avoids the potential spread of rust.

Note any unusual sounds, like creaking or popping, which can indicate movement between panels or improper installation. Ensure fasteners remain tight, but take care not to over-tighten, as this can strip the threads or distort the metal. Always consult with a professional if you’re uncertain about any aspects of roof maintenance or repair. A small investment in regular check-ups can save you significantly in the long run, preserving the integrity and appearance of your metal roof.

Frequently Asked Questions For How To Install Metal Roofing Over Shingles

Can You Install Metal Roofing Over Shingles?

Yes, you can install metal roofing over shingles. It avoids removal costs and additional waste. However, check local building codes to ensure compliance and determine if your roof framing can support the additional weight of the metal roof over the shingles.

What Are The Benefits Of Metal Over Shingle Roofing?

Metal roofing offers longevity, durability, and energy efficiency. It can last 40-70 years, reflects solar radiant heat, and may reduce cooling costs. Additionally, metal is resistant to fire, mildew, insects, and rot, offering enhanced protection.

How To Prepare Shingles For Metal Roofing?

To prepare shingles for metal roofing, clean the roof of debris and moss. Install a layer of roofing felt or a synthetic underlayment for additional insulation and moisture protection. Then, attach furring strips across the shingle roof to create a solid mounting structure.

Do You Need Underlayment For Metal Roofing?

An underlayment is highly recommended for metal roofing installations. It provides a moisture barrier, protecting the roof from condensation issues that can cause rust and improve overall longevity. Use synthetic products designed for metal roofing systems for the best protection.


Wrapping up, and installing metal roofing over existing shingles is a savvy upgrade for your home. This guide has paved the way to boost your roof’s durability with a clear, step-by-step approach. Embrace the challenge, ensure compliance with local building codes, and enjoy your home’s new armor against the elements.

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