Can I Use Gaf Feltbuster Under Metal Roof

Yes, you can use GAF FeltBuster under a metal roof.

GAF FeltBuster is a synthetic roofing underlayment that can be used for various types of roofing, including metal. It provides a protective layer between the roof deck and the metal panels, helping to prevent moisture buildup and potential damage to the roof structure. Additionally, FeltBuster is lightweight and easy to install, making it a great choice for contractors and DIY homeowners alike.

Can You Use GAF FeltBuster Under a Metal Roof?

If you are wondering whether you can use GAF FeltBuster under a metal roof, the answer is: it depends on the type of metal roof you are planning to install.

Standing Seam Metal Roofs

If you are installing a standing seam metal roof, then using GAF FeltBuster as an underlayment is not recommended. Standing seam roofs are designed to be installed without an underlayment, as the panels interlock and create a waterproof barrier.

Corrugated Metal Roofs

On the other hand, if you are installing a corrugated metal roof, then using GAF FeltBuster as an underlayment can be a good idea. Corrugated metal roofs are more prone to wind-driven rain and require an additional layer of protection to prevent leaks and moisture damage.

By installing GAF FeltBuster under a corrugated metal roof, you can create a secondary waterproof barrier that will help protect your home from leaks and moisture damage.


Before installing any underlayment under your metal roof, it is always best to consult with a roofing professional to determine the best materials and methods for your specific roof type and climate. By doing so, you can help ensure that your metal roof provides reliable protection and long-lasting durability for years to come.

Can You Use Roofing Felt Under Metal Roof?

When it comes to metal roofing, using roofing felt as an underlayment is a common practice. In fact, it is recommended to use 30# felt or two layers of 15# felt for metal roof panels. Roofing felt is a versatile roofing accessory made of either natural materials like wood cellulose or synthetic materials such as polyester or fiberglass.

The material is then coated with asphalt to make it waterproof and resistant to water damage. This layer acts as a protective barrier between your metal roofing panels and the underlying structure, keeping your home safe and dry.

What Underlayment Do You Use Under Metal Roofing?

When installing a metal roof on a steep-slope, it is important to use a sturdy and reliable underlayment to protect the roof from moisture and weather damage. The most commonly used material for this purpose is non-perforated, asphalt-impregnated felt underlayment. This traditional underlayment provides a barrier against moisture, while also allowing for proper ventilation.

However, there are other materials available, such as synthetic underlayment, which may offer improved durability and resistance to tearing. Careful consideration should be given to the climate and conditions of the building site when selecting an underlayment for metal roofing.

Can You Use Synthetic Felt Under Metal Roofing?

When installing a metal roof, you may wonder whether it’s okay to use synthetic felt as underlayment. The good news is that synthetic felt is a suitable option for metal roofing. The main advantage of synthetic felt over traditional felt paper is that it’s more durable and resistant to moisture.

However, felt paper is often a more affordable option, and it’s still a reliable choice. Ultimately, the choice between synthetic felt and felt paper comes down to personal preferences and budget constraints.

How Can I Ensure a Proper Seal Between the Metal Roof and the Wall When Using Gaf Feltbuster Underlayment?

When installing GAF FeltBuster underlayment, ensuring a proper seal between the metal roof and the wall is crucial to prevent water damage. By fixing roof-to-wall gaps with ease, you can work efficiently and achieve a lasting seal. Include a drip edge flashing and seal it tightly to the wall with roofing cement. Then, use roofing screws to attach the metal roofing panels while keeping them aligned with the drip edge flashing.

Frequently Asked Questions

Can You Use House Wrap Under a Metal Roof?

Yes, it is recommended to use house wrap under a metal roof. It can act as a barrier against moisture, drafts, and other elements that may damage the roof structure. A properly installed house wrap can also improve energy efficiency and reduce heating and cooling costs.

However, it is important to use a house wrap that is specifically designed for metal roofs and follow the manufacturer’s guidelines for installation to ensure optimal performance.

Can Tyvek Be Used Under a Metal Roof?

Yes, Tyvek can be used under a metal roof. Tyvek is a durable and breathable material that can protect the building from moisture and prevent the growth of mold and mildew. It is important to install Tyvek correctly to ensure that it provides optimal protection.

You should consult with a professional roofing contractor to determine the appropriate Tyvek installation for your metal roof. By using Tyvek under your metal roof, you can increase the energy efficiency of your building and extend the lifespan of your roof.

What Is the Best Thing to Put Under a Metal Roof?

When installing a metal roof, it is important to consider what type of material to use as an underlayment. The best option is a synthetic underlayment made of a high-quality polymer. This material is strong, durable, and resistant to moisture, making it an ideal choice for use under a metal roof.

It also provides additional protection against leaks and helps to prevent damage to the roof structure. Other options include traditional felt paper or self-adhering ice and water shield, but synthetic underlayment is generally considered to be the best choice.

What Kind of Insulation Do You Use Under a Metal Roof?

When it comes to insulating a metal roof, there are a few different options to consider. One popular choice is to use rigid foam insulation, which can be installed directly underneath the metal panels. Another option is to use fiberglass batts or blown-in insulation, which can be installed in the attic space above the metal roof.

Reflective insulation is also an effective choice, as it helps to reflect radiant heat away from the roof. Ultimately, the best type of insulation for your metal roof will depend on your specific needs and budget.

Should You Put Plastic Under a Metal Roof?

When installing a metal roof, it is not necessary to put plastic underneath it. While some contractors recommend this, it can actually do more harm than good. Moisture can become trapped between the plastic and the metal, causing rust and corrosion.

Additionally, plastic can create a vapor barrier, which can lead to condensation and water damage. Instead, it is important to properly ventilate the roof to allow for proper air flow and prevent moisture buildup. Proper installation and maintenance of a metal roof can provide long-lasting protection for your home.


In conclusion, while there are different types of underlayment that can be used under a metal roof, it is important to consider the specific requirements of the roofing material and manufacturer’s recommendations. GAF FeltBuster can be a suitable option for some metal roofing applications, but it is important to ensure it meets the necessary standards and is installed correctly for optimal performance. Consulting with a roofing professional can help ensure that your metal roof is installed with the proper underlayment to protect your home for years to come.


Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *