Do I need closure strips for metal roofing? Everything You Need to Know

In this blog post, we’ll explore everything you need to know about closure strips for metal roofing and why they’re an essential part of any successful installation project. 

So whether you’re a seasoned DIYer or hiring a professional contractor, read on to discover why paying attention to these often-overlooked details can make all the difference in your roof’s lifespan and performance.

What are Closure Strips?

When it comes to metal roofing, closure strips are an important part of the system. Closure strips are used to seal the edges of the metal panels and provide a watertight barrier. They are available in a variety of widths and colors to match your metal roofing system.

Closure strips are made of different materials, including plastic, rubber, and foam. The most common type of closure strip is the plastic closure strip. 

Plastic closure strips are easy to install and require no special tools or skills. They are also relatively inexpensive and can be found at most home improvement stores.

Rubber and foam closure strips are more expensive than plastic strips but offer superior performance. Rubber strips provide a better seal against wind and moisture. Foam strips are more flexible than rubber strips, making them ideal for use around curves or corners.

When choosing closure strips for your metal roofing system, be sure to select the right size and type for your application. For example, use different closure stripping for standing seam roofs versus corrugated roofs. Also, make sure the closure strip you choose is compatible with the type of metal roofing system you have. 

Closure Strips come in different widths that will fit any standard Metal Roofing Panel thickness from 24 gauge up to 22 gauge; as well as different colors to match most panel profiles including white, tan/light stone, gray, dark brown, galvalume plus (a metallic gray color), terra cotta. 

Benefits of Using Closure Strips for Metal Roofing

Via: Mountain top metal roofing

Closure strips provide many benefits for metal roofs. They create a watertight seal that helps prevent leaks. They also keep out dirt, dust, and other debris that can damage the roof or clog gutters. Closure strips can also help insulate the roof and reduce noise from rain and hail.

Different Types of Closure Strips

Via: Vintage metal roofing

There are several different types of closure strips that can be used for metal roofing, and the type you choose will depend on the specific application and needs of your project. Some common types of closure strips include:

  • Foam closure strips: Foam closure strips are a popular choice for metal roofing projects because they are easy to install and provide a good seal against the elements. They are also relatively inexpensive and can be found at most home improvement stores.
  • Rubber closure strips: Rubber closure strips are another popular option for metal roofing projects. They offer a tight seal against the elements and are also easy to install. However, they are more expensive than foam closure strips.
  • Vinyl closure strips: Vinyl closure strips are a good choice for projects that require a more durable seal against the elements. They are also more expensive than foam or rubber closure strips.

How to Install Closure Strips for Metal Roofing

If you’re installing a metal roof, it’s important to use closure strips around the edges of the roofing panels. Closure strips create a seal that helps keep out water, wind, and debris. They also provide a finished look to the edge of the roof.

Installing closure strips is relatively easy. Just follow these steps:

  • Measure the length of the edge of the roof panel where you’ll be installing the closure strip. Cut the strip to size with a sharp knife or shears.
  • Peel off the backing from the adhesive on the closure strip. Press the strip into place along the edge of the roof panel.
  • Use a roller or your hands to press down on the strip and ensure good contact with the adhesive.
  • Repeat steps 1-3 for each edge of each roof panel.

Alternatives to Using Closure Strips for Metal Roofing

If you are looking for an alternative to closure strips for your metal roofing, there are a few options available. One option is to use sealant tape. This tape is designed to create a watertight seal between two surfaces. It is important to make sure that the surfaces are clean and dry before applying the tape. 

Another option is to use caulk. Caulk can be applied around the perimeter of the panels to create a seal. It is important to choose a caulk that is compatible with the material of your roofing panels.

Advantages and Disadvantages of Using Closure Strips

While closure strips are an essential part of any metal roofing system, there are both advantages and disadvantages to using them.


  • Closure strips provide an extra layer of protection against water infiltration.
  • They help to create a more secure seal between the metal panels, which can improve the overall strength and stability of the roof.
  • Closure strips can provide additional insulation for the roof, which can help to reduce energy costs.
  • They can also help to reduce noise levels from rain and hail on the roof.


  • Closure strips can be costly, which can add to the overall expense of a metal roofing project.
  • They require regular maintenance and inspection to ensure that they are properly sealed and functioning as intended.
  • In some cases, closure strips can cause problems with ventilation if they are not installed correctly or if they become damaged over time.


Are Foam Closure Strips Necessary For Metal Roofing?

Yes, at different metal roofing flashing details, metal roofs will need both inner and outside foam closure strips. The installation technique includes a crucial phase that guards against wind-driven rain. 

When To Use Foam Closure Strips? 

While some homeowners opt to omit foam closing strips from their metal roof purchases, we advise using them as they help the roof’s performance. When you need a weather-tight seal for your roof to keep pests and noise outside your house, they are a great option.

Where Do You Install Foam Closures For Metal Roofs?

The metal roofing installation instructions provided by the manufacturer will always show you which metal roofing flashing details call for foam closures. Foam closures are necessary for metal roofs when the following metal roofing trim circumstances exist:

  • Eave Trim
  • Ridge Cap
  • Peak Trim or High Side Eave
  • Endwall or Chimney Flashing
  • Pitch Break Or Transition Flashing
  • Valley Flashing
  • Pre-Hung Box Gutter


As you can see, using closure strips for metal roofing is an important step in the installation process. Not only do they provide protection from water damage and other weather elements, but they also help to ensure that your metal roof lasts for many years. 

If you’re thinking of installing a metal roof on your home or business, make sure you invest in quality closure strips and follow proper installation instructions so that your new roof will be able to stand up to even the harshest conditions.

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