3 Types of Roofing Underlayment (Pros & Cons)

When it comes to protecting your home, roofing underlayment is an unsung hero. Acting as a secondary layer of defense between your roof and the elements, the right underlayment can make all the difference in extending the life of your roof and ensuring its durability. But with so many options available, how do you know which one is best for your home?

This guide will break down the main types of roofing underlayment, explain their pros and cons, and help you make an informed decision. Here’s what we’ll cover:

• What is roofing underlayment (and why does it matter)?
• Different types of roofing underlayment
• How to choose the right underlayment for your roof

🤔 What is Roofing Underlayment?

Roofing underlayment is a water-resistant or waterproof layer that is installed directly onto your roof deck, underneath the shingles, tiles, or other outer roofing materials. It acts as an essential protective barrier, safeguarding your home from potential damage caused by wind-driven rain, snow, and debris. While your primary roofing materials are designed to keep water out, they are not entirely impervious to wear and tear over time. This is where roofing underlayment plays a crucial role in providing additional protection.

Think of underlayment as the backup system for your roof. It steps in to protect your home when the outer layer of shingles or tiles becomes compromised—whether from severe weather, aging, or accidental damage. Without underlayment, even the most durable roof materials can allow water to seep through, leading to leaks, mold growth, and premature deterioration of the roof structure. These issues can escalate quickly, potentially causing significant damage to the interior of your home.

Benefits of Roofing Underlayment:

• Extra Protection: Shields your home from water infiltration.
• Enhanced Durability: Prolongs the lifespan of your roof.
• Improved Fire Resistance: Certain types of underlayment can provide fire retardant properties.
• Climate Adaptability: Helps your roof stand strong against extreme weather conditions.

⚖️ 3 Different Types of Roofing Underlayment

Whether due to materials, applications, or cost differences, the type of roofing underlayment you choose can have a big impact on your roof’s performance. Here’s an overview of the three main types:

1. Asphalt-Saturated Felt

Asphalt-saturated felt is one of the oldest and most traditional types of roofing underlayment. It’s made from either organic or fiberglass material that is saturated in asphalt to enhance its water resistance. This type of underlayment has been used for decades due to its affordability and compatibility with standard roofing materials, especially asphalt shingles. It is easy to source from most roofing suppliers, making it a convenient option for many projects. However, asphalt-saturated felt does have its drawbacks. Its heavier weight can add significant load to your roof system, which may require additional structural support. Over time, this type of underlayment is susceptible to absorbing moisture, causing it to wrinkle. Additionally, its durability is limited compared to modern options, making it more prone to tears during installation or in harsh conditions.

2. Rubberized Asphalt

Rubberized asphalt is an upgraded, high-performance roofing underlayment that offers exceptional waterproofing capabilities. It features a full waterproof membrane, along with self-adhering properties, making it an excellent choice for roofs in high-risk areas prone to severe weather, such as heavy rainfall or snow. Its 100% waterproof membrane provides superior protection against water damage, ensuring the underlying structure of the roof remains intact. The self-adhesive nature of this underlayment makes it easier to install, particularly on complex roof designs, and it performs exceptionally well in regions with extreme temperatures, whether hot or cold. However, this premium level of performance comes at a higher cost, making it one of the most expensive underlayment options available. For areas with mild climates and low precipitation, rubberized asphalt may be unnecessary, as its advanced features are often overkill in such environments.

3. Synthetic Roofing Underlayment

Synthetic roofing underlayment has become the preferred choice for modern roofing projects due to its premium performance and durability. Made from polypropylene or polyethylene, this type of underlayment is designed to offer superior water resistance while being lightweight and easy to handle during installation. Unlike traditional felt, synthetic underlayment does not wrinkle or absorb moisture, ensuring a smooth and reliable surface beneath roofing materials. Its durability is unmatched, as it is highly resistant to tears and damage even in challenging conditions. Additionally, some brands offer eco-friendly synthetic options made from recyclable materials, appealing to environmentally conscious homeowners. While synthetic roofing underlayment is more expensive compared to asphalt-saturated felt, many professionals consider its performance and longevity well worth the investment. However, it does require skilled installation to ensure it is applied correctly and performs as intended, making it less suitable for DIY projects.

👉 How to Choose the Right Underlayment for Your Roof

Selecting the right underlayment depends on several factors, including your roof type, local climate, and budget. Here’s a step-by-step approach to making your decision:

1. Assess Your Climate

The climate in your region plays a major role in determining the right underlayment for your roof. If you live in an area prone to heavy rain or snow, it’s crucial to choose an underlayment that can provide extra protection against moisture. Rubberized asphalt or synthetic underlayment are excellent choices for such conditions, as they offer enhanced water resistance and durability. On the other hand, if you reside in a drier region with less precipitation, asphalt-saturated felt may be a sufficient and cost-effective option for your roofing needs.

2. Consider Your Roofing Material

Your roofing material also influences the type of underlayment you should choose. Asphalt shingles, being one of the most common roofing materials, work well with almost all types of underlayment, offering flexibility in your selection. However, if you are installing heavier materials like slate or tile, it’s better to opt for synthetic underlayment. Its lightweight nature makes it easier to handle and ensures compatibility with the structural demands of heavier roofing materials.

3. Factor in Your Budget

Budget is another important consideration when selecting roof underlayment. If you’re looking to minimize costs, asphalt-saturated felt is an affordable option that offers decent performance for many roofing applications. However, if you prioritize long-term durability and want to reduce the frequency of replacements, synthetic underlayment is a worthwhile investment. While it may cost more upfront, its superior durability and performance often result in better value over time.

4. Consult a Professional

Choosing the right underlayment can feel overwhelming, especially with so many factors to consider, such as climate, roofing material, and budget. If you’re unsure which option is best suited for your specific needs, it’s always a good idea to consult a roofing professional. They can assess your home’s unique requirements, provide tailored recommendations, and ensure that your roof is equipped with the right materials for optimal performance and protection.

🏠 Roofing Underlayment Guide

When it comes to roofing underlayment, making the right choice is essential for the durability and protection of your home. But having the right roofing team is just as important. At I AM Roofing, we combine years of experience, high-quality materials, and unmatched customer service to ensure your roof stands the test of time.

As a veteran-owned and family-operated business, we bring integrity and reliability to every project, offering a lifetime workmanship warranty for your peace of mind. Ready to take the next step? Schedule your free roof evaluation today and let us show you why we’re Alabama’s trusted #1 choice in roofing.