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Roofing Underlayment: Why It's Important and What You Should Know

When we think of our homes' roofs, we often picture the visible outer layer—shingles or tiles. However, another lesser known safeguard of your roof lies beneath the surface, hidden but essential—roofing underlayment. In this blog, we'll cover all things roofing underlayment: why it is important, the types of roofing underlayment, and five final points to consider before choosing underlayment for your next roof.

Roofing Underlayment

Understanding Roofing Underlayment

Roofing underlayment, sometimes simply called "underlayment," is a protective layer strategically placed between the roof deck (the structural foundation of your roof) and the outer roofing material, such as shingles or tiles. Its primary role is to act as a secondary barrier against moisture infiltration, ensuring your roof and your home stay dry and secure.

Why Roofing Underlayment Is Vital

  1. Water Resistance: Perhaps its most crucial function, roofing underlayment serves as a defense against water finding its way into your home. Even when shingles or tiles are damaged or displaced due to severe weather, the underlayment acts as an impermeable membrane, keeping rainwater at bay.

  2. Guarding Against Ice and Snow: In regions prone to cold weather, ice dams can form on roofs, leading to water backup and potential leaks. Roofing underlayment provides an additional layer of protection against this common issue.

  3. Mitigating Condensation: Underlayment helps manage moisture within your attic space. Without it, excess moisture can accumulate, leading to mold growth and deterioration of the roof structure.

  4. Enhancing Longevity: High-quality underlayment can extend the life of your roofing system. It shields the roof deck from the detrimental effects of UV rays and other environmental elements.

  5. Bolstering Wind Resistance: Underlayment reinforces your roof's ability to withstand strong winds. It secures the roofing material, preventing it from lifting or sustaining damage during storms.

  6. Fire Protection: Certain underlayment materials possess fire-resistant properties, adding an extra layer of defense in case of a fire.

  7. Noise Reduction: Underlayment can also help muffle the sounds of rain, hail, and other external factors, contributing to a quieter indoor environment.

True Grit 30 Roofing Underlayment

True Grit 30 Underlayment Stocking Dealer

Types of Roofing Underlayment

Roofing underlayment comes in various types, each tailored to specific characteristics and applications:

1. Asphalt-Saturated Felt:

  • Crafted from organic or fiberglass materials.

  • Economical and widely used.

  • Provides effective waterproofing.

2. Synthetic Underlayment:

  • Manufactured from synthetic materials like polyethylene or polypropylene.

  • Lightweight and easy to handle.

  • Exhibits excellent resistance to water and UV damage.

3. Rubberized Asphalt:

  • Combines asphalt with rubber polymers.

  • Highly flexible and exceptionally durable.

  • Ideal for harsh weather conditions.

4. Self-Adhering Membranes:

  • Sticky on one side, facilitating straightforward installation.

  • Proven effectiveness in preventing water penetration.

  • Ideal for roofs with low slopes.

The choice of underlayment depends on several factors, including your local climate, the type of roofing material, and your budget. Consulting with a roofing professional is crucial to determine the best underlayment for your specific requirements.

Key Considerations About Roofing Underlayment

  1. Proper Installation: The correct installation of underlayment is paramount. It should be laid smoothly without wrinkles to ensure efficient water shedding. Any punctures or tears should be promptly addressed.

  2. Ventilation Matters: Adequate attic ventilation is important when using underlayment. It helps regulate moisture accumulation and extends the life of your roofing system.

  3. Code Compliance: Building codes may dictate the type of underlayment and its installation requirements in your region. Always ensure your roofing project adheres to local codes and regulations.

  4. Professional Installation: It's advisable to enlist the services of a professional roofing contractor for underlayment installation and roof replacement. They possess the expertise required to ensure proper underlayment installation, critical for optimal performance.

  5. Long-Term Investment: Investing in high-quality roofing underlayment is a forward-thinking investment in your home's protection and longevity. Though it may involve a slightly higher upfront cost, it can result in significant savings down the road by avoiding water damage on your roof and inside your home.


Roofing underlayment plays a pivotal role in safeguarding your home by preventing moisture infiltration, wind damage, and other environmental stressors. Understanding its significance and selecting the appropriate type for your roof can greatly impact the durability and effectiveness of your home's roofing system. When it comes to your roof, remember that what's beneath the surface matters just as much as what's on top. Choosing a top-notch underlayment can make all the difference in the protection and longevity of your home.

At CGR Wholesale in Rostraver, PA, we offer high-quality synthetic roofing underlayment materials to cater to your roofing needs. Our most popular product for good reason is the Owens Corning® ProArmor® Synthetic Roof Underlayment with Fusion Back Coating Technology™. Visit our warehouse or explore our website to learn more about the perfect underlayment materials for your roofing needs.

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