Do I Need Closure Strips for Metal Roofing? Essential Tips and Benefits Explained

When I first considered installing a metal roof, I stumbled upon the term “closure strips” and wondered if they were really necessary. Metal roofing promises durability and sleek aesthetics, but ensuring it’s properly sealed is crucial. Closure strips play a key role in this, preventing unwanted elements like moisture, pests, and debris from sneaking in.

In this article, I’ll dive into what closure strips are, why they’re important, and whether you need them for your metal roofing project. Whether you’re a DIY enthusiast or planning to hire professionals, understanding these small yet significant components can make a big difference in the longevity and performance of your roof.

Key Takeaways

  • Essential for Sealing: Closure strips are crucial for sealing gaps in metal roofing, preventing moisture, pests, and debris from entering.
  • Types of Closure Strips: There are various types, including inside, outside, profile-specific, and universal strips, each designed to fit different roofing profiles and installation areas.
  • Weather Resistance and Efficiency: Using closure strips enhances weather resistance, improves insulation, and increases energy efficiency, contributing to lower utility bills and a more comfortable indoor environment.
  • Proper Installation: Installation requires tools like measuring tape, utility knife, adhesive caulk, and roofing nails or screws. Correct installation steps ensure a weather-tight seal.
  • Maintenance: Regular inspections and timely replacement of worn or damaged strips are essential to maintain the integrity and longevity of your metal roofing.

Understanding Closure Strips for Metal Roofing

What Are Closure Strips?

Closure strips are essential components for metal roofing installations, designed to seal the gaps between the panels and surrounding materials. Made from materials like foam or rubber, they fit the contours of the metal panels to provide a tight seal. Closure strips prevent elements like moisture, pests, and debris from entering, ensuring the roof’s integrity and longevity. These strips are typically installed at the eaves, ridges, and between panels to create a weather-tight barrier.

Types of Closure Strips

Different types of closure strips cater to various metal roofing profiles and installation needs. It’s crucial to choose the right type to ensure proper sealing and performance.

  1. Inside Closure Strips: Designed for the underside of metal panels, these strips seal gaps between the roofing material and the underlying substrate.
  2. Outside Closure Strips: Positioned on top of the metal panels, these strips seal gaps at the top edge, often used at ridges and hips.
  3. Profile-Specific Strips: Tailored to match specific metal roof profiles, such as corrugated or ribbed panels, these strips ensure a precise fit.
  4. Universal Closure Strips: Versatile options that fit multiple profiles, these strips offer convenience but may not provide as snug a fit as profile-specific types.

Selecting the appropriate type of closure strip based on the metal roofing profile and installation area is vital for optimal performance and longevity.

Benefits of Using Closure Strips

Improved Weather Resistance

Closure strips enhance weather resistance by sealing gaps between metal panels and edges. These gaps, if left open, allow moisture, pests, and debris to infiltrate. Made of foam or rubber, closure strips fit snugly along the roof’s ridges and valleys. By preventing water infiltration, they reduce the risk of leaks and water damage. This protection ensures that the roof performs optimally even in adverse weather conditions.

Better Insulation and Energy Efficiency

Closure strips improve insulation and energy efficiency by blocking airflow between the roof and the building’s interior. This barrier reduces heat loss during winter and heat gain during summer. As a result, energy consumption for heating and cooling decreases. This efficiency leads to lower utility bills and a more comfortable indoor environment. By adding these strips, you contribute to a sustainable and cost-effective roofing solution.

Installation of Closure Strips

Tools and Materials Needed

Proper installation of closure strips requires specific tools and materials. The essential items include:

  1. Measuring Tape: Ensures accurate placement.
  2. Utility Knife: Cuts closure strips to the required length.
  3. Metal Snips: Trims metal panels as needed.
  4. Adhesive Caulk: Secures the strips in place.
  5. Closure Strips: Foam or rubber, matched to roofing profile.
  6. Roofing Nails or Screws: Fastens strips and panels securely.

Ensure all these items are readily available before starting the installation process.

Step-by-Step Installation Guide


  1. Clean Surface: Remove debris and ensure the surface is dry.
  2. Measure Length: Use measuring tape to calculate the length of closure strips needed. This helps to avoid gaps.
  1. Cut Strips: Use a utility knife to cut the closure strips according to measured lengths.
  2. Align Strips: Place the closure strips along the edges where metal panels meet the roof. Check alignment with the panel profile.
  3. Apply Adhesive: Apply adhesive caulk along the strip’s underside before positioning.
  4. Secure Strips: Firmly press the closure strips onto the roof’s surface. Ensure they’re adhered properly.
  5. Fasten Metal Panels: Using roofing nails or screws, attach the metal panels over the closure strips, ensuring a tight fit.

These steps ensure that the closure strips are installed correctly, creating a weather-tight seal and prolonging the roof’s lifespan.

Common Issues and Troubleshooting

Addressing Leaks and Gaps

Leaks and gaps often indicate improper installation of closure strips. Inspect these areas closely, looking for misaligned or missing strips. If gaps are present, reseal with high-quality sealant. Double-check the fitment of each strip against the metal roofing profile. Replace any damaged or worn strips immediately to maintain an optimal seal. Leaks near ridges, eaves, and panel joints are common trouble spots to examine.

Maintenance Tips for Longevity

Regularly inspect closure strips to catch wear early. Clean debris from roofing surfaces to prevent deterioration. Apply UV-resistant sealants to prolong exposure life. Schedule semi-annual inspections, particularly after severe weather events. Ensure proper ventilation to reduce moisture buildup under the roofing panels. Replace any aged or brittle strips to keep the barrier intact. Maintain the longevity of your metal roofing by addressing closure strip issues promptly and systematically.


Using closure strips for metal roofing is essential for maintaining a durable and efficient roof. They effectively seal gaps preventing moisture pests and debris from compromising your roof’s integrity. By choosing the right type of closure strips for your specific roofing profile and following proper installation and maintenance practices you can ensure long-term protection and performance. Regular inspections and timely interventions will help you address any issues before they escalate. Ultimately investing in quality closure strips and taking care of them can lead to better weather resistance improved insulation and significant savings on energy bills.

Frequently Asked Questions

What are closure strips used for in metal roofing?

Closure strips are used in metal roofing installations to seal gaps and prevent moisture, pests, and debris from infiltrating the roof. They help maintain the integrity of the roofing system.

What types of closure strips are available?

There are various types of closure strips designed to match specific metal roofing profiles and installation requirements, ensuring a proper seal and fit.

How can I troubleshoot leaks and gaps in closure strips?

Inspect the closure strips for proper placement and alignment. If necessary, realign or replace them promptly to address potential leaks and gaps.

What are some maintenance tips for ensuring the longevity of closure strips?

Regular inspections, cleaning, applying sealants, and ensuring proper ventilation will help maintain closure strips and extend their lifespan.

Why is it important to address closure strip issues promptly?

Addressing closure strip issues promptly ensures the roof’s integrity, improves weather resistance, enhances insulation, boosts energy efficiency, and saves on utility bills.