Over the years, metal roofing has gained popularity among homeowners. With its durability, metal roofing can withstand harsh weather conditions and can last 40 to 70 years with proper maintenance. As metal roofs reflect solar heat, metal is an ideal roofing material for keeping homes cooler during hot summer months. Furthermore, metal roofs are relatively low maintenance and lightweight, making metal roofing ideal for many homeowners.

Installing Metal Roofing over an Existing Roof

In some cases, metal roofing may be installed over an existing roof. Although each type of roofing material may pose its own challenges, metal roofing can be installed over various types of existing roofing materials. Installing metal roofing over asphalt shingles can be challenging due to uneven surfaces and potential adhesion issues; however, it is possible to install metal roofing over asphalt shingles. When it comes to wood shingles or shakes, it is important to address compatibility prior to installing metal roofing over wood shingles or shakes. However, metal roofing can be installed on wood roofing materials and provide a durable and fire-resistant surface. Furthermore, metal roofing can be installed over concrete tiles, clay tiles, and synthetic roofing materials, offering a long-lasting and low maintenance roofing solution.

For some homeowners, installing metal roofing over existing roofing material can be a practical and cost-effective solution for roofing projects. Here are some reasons why:


Removing an existing roof can be a labor-intensive and time-consuming part of the roofing project. If the existing roof is in good condition and is compatible with metal roofing, it may be possible to move forward with the roofing project. Install metal roofing over the existing roof eliminates the need for the tear-off and disposal of the old roofing materials and can reduce the labor and waste removal expenses.

Time Efficiency

As the existing roof will not be removed, the metal roof installation project can be completed relatively quickly compared to a complete roof replacement project.

Minimal Disruption

Since the existing roof will not be torn off, the noise, dust, and debris typically associated with that aspect of roofing projects can be avoided. In addition to a quicker installation process, installing metal roofing over the existing roof can reduce disruption to the home’s occupants.

Durability and Weather Resistance

Metal roofing is a durable roofing material and can withstand harsh weather conditions, such as rain, snow, hail, and wind. Installing metal roofing can enhance your home’s resilience to harsh weather conditions and increase your roof’s lifespan.

Opportunity for Additional Insulation

Furthermore, the roofing project can provide homeowners the opportunity to add insulation between the old roof and the new metal roof. In addition to metal roofing’s reflective properties that keep buildings cool in hot climates, additional insulation can enhance the home’s energy efficiency and reduce heating and cooling costs.

Considerations for Combining Metal Roofing with Other Materials

While installing metal roofing over an existing roof can be a viable option under certain circumstances, there are several important considerations to address before proceeding with the roofing project.

Roofing Condition

It is important to thoroughly inspect and assess the condition of the existing roof. The underlying roof structure and decking must be in good condition and free of significant damage, rot, or decay. Installing metal roofing over a water-damaged roof may lead to trapped moisture and further deterioration. It is important to have a solid and stable roof structure for a proper installation and longevity of the new roofing system. Any issues with the existing roof should be addressed before installing the metal roof.

Weight Capacity

Some structures may not be able to support heavy or additional weight. If there are already multiple layers of roofing material in place, adding a new layer of roofing can increase the overall weight on the roof structure, potentially leading to structural problems. While metal roofing is relatively lightweight, it is important to verify that the house structure can handle the load before proceeding with the roofing project.

Roofing Material Compatibility

While metal roofing can be installed over some types of roofing materials, it may not be suitable for certain other roofing materials. It is important to verify that the existing roofing material is compatible with metal roofing before undertaking the installation project.

Ventilation and Insulation

Adequate ventilation and insulation are important for energy efficiency and for preventing condensation issues. Homeowners may need to add ventilation features or insulation during the metal roof installation.

Local Building Codes and Regulations

Check with local authorities to ensure that installing metal roofing over an existing roof is permitted and that there are no specific requirements or restrictions that need to be followed.

Roofing Installation Team

Before undertaking a roofing project, it is important to have a professional to conduct a thorough inspection of the existing roof and provide recommendations for the best course of action. It is important to properly address existing issues, if any, before installing new roofing material.

Furthermore, to ensure the durability and longevity of your roofing material, proper installation is important. A skilled and experienced professional can help you determine whether installing a metal roof over your home’s existing roof is a suitable option for your home and can provide insights into necessary repairs or preparation before the installation.