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4 Roof Underlayment Types To Consider For Your Home

When it comes to roofing, it’s not just about the shingles you choose—it’s what’s underneath that matters too! Roof underlayment is a crucial layer that provides an extra shield against moisture, helps with insulation, and contributes to your roof’s overall longevity. In this guide, we’ll explore the world of roof underlayment and introduce you to four common types to consider for your next roofing project. Let’s dive in and protect your home from the top down!

Inside this blog:

  • The key role that roof underlayment plays in protecting your home
  • 4 common types of roof underlayment
  • Benefits of each roof underlayment type

Keep reading to learn all you need to know about roof underlayment and which type is the best for your home!

The Role of Roof Underlayment 🌧️


Before we explore the types of roof underlayment, let’s understand why it’s an essential component of your roofing system:

  • Moisture Barrier: Roof underlayment acts as a moisture barrier, preventing rainwater, ice, and snow from infiltrating your roof and causing damage to the structure.
  • Temperature Regulation: It helps with temperature regulation by providing additional insulation, keeping your home cooler in the summer and warmer in the winter.
  • Protection: Underlayment provides an extra layer of protection between your roofing materials and the decking, shielding your roof from potential leaks and damage.

4 Common Roof Underlayment Types

Now that we’ve covered the importance of roof underlayment, let’s explore four common types and their characteristics:

1. Asphalt-Saturated Felt

Asphalt-saturated felt, also known as roofing felt or tar paper, is one of the most traditional underlayment materials. It consists of paper or fiberglass saturated with asphalt. It’s affordable and offers basic protection against moisture.

2. Synthetic Underlayment

Synthetic underlayment is a more modern alternative to traditional felt. It’s made from materials like polyethylene or polypropylene and offers superior water resistance. It’s lightweight, durable, and easier to install.

3. Rubberized Asphalt

Rubberized asphalt underlayment is self-adhering and provides excellent waterproofing. It’s made of asphalt mixed with synthetic rubber and is highly resistant to moisture and UV rays. This type is particularly suitable for areas prone to heavy rainfall.

4. Peel-and-Stick Underlayment

Peel-and-stick underlayment is another self-adhering option. It’s easy to install, thanks to its peel-away backing, and it offers superior protection against water intrusion. This type is often used in high-risk areas or for premium roofing installations.

Advantages of Each Roof Underlayment Type 🌟


Let’s take a closer look at the advantages of each roof underlayment type:

  • Asphalt-Saturated Felt: This traditional option is cost-effective and provides a basic level of protection against moisture. It’s a suitable choice for standard roofing projects on a budget.
  • Synthetic Underlayment: Synthetic underlayment offers excellent water resistance, durability, and ease of installation. It’s a versatile option suitable for various roofing materials.
  • Rubberized Asphalt: Rubberized asphalt underlayment excels in waterproofing and UV resistance. It’s ideal for regions with heavy rainfall and provides long-lasting protection.
  • Peel-and-Stick Underlayment: Peel-and-stick underlayment is the go-to choice for premium roofing installations and high-risk areas. Its self-adhering properties make it easy to work with, and it offers superior waterproofing.

Choosing the Right Roof Underlayment

Selecting the right roof underlayment for your home involves considering various factors:

  • Climate: Your local climate plays a significant role in choosing underlayment. If you live in an area with heavy rainfall or snowfall, a highly water-resistant underlayment is essential.
  • Roofing Material: The type of roofing material you choose can influence your underlayment selection. Some materials, like metal roofing, may require specific underlayment types for compatibility.
  • Budget: Your budget will also impact your choice. While synthetic and rubberized underlayments tend to be more expensive, they offer superior performance and longevity.
  • Local Building Codes: Check your local building codes and regulations, as they may specify the type of underlayment required for your region.

The Installation Process👷

Installing roof underlayment is a critical step in your roofing project. Below is an overview of the process in 4 steps.

1. Prepare the Roof Deck

Ensure the roof deck is clean, dry, and free of debris before installing underlayment. Any defects in the deck should be repaired. This step is crucial to provide a solid foundation for your underlayment and roofing materials.

2. Start at the Eaves

Begin the installation at the eaves (bottom edge of the roof). Unroll the underlayment and secure it in place, leaving a slight overhang to direct water into the gutters. Properly positioning the underlayment at the eaves is essential for effective water drainage.

3. Overlap Seams

Overlap seams of adjacent underlayment sheets according to the manufacturer’s guidelines. Proper overlapping ensures a watertight barrier and prevents water from seeping through the seams, protecting your roof deck.

4. Secure and Trim

Fasten the underlayment using appropriate fasteners, such as nails or staples. Be sure to trim excess material as needed to maintain a neat and secure installation. Properly securing and trimming the underlayment helps maintain its integrity and effectiveness.

Protect Your Home from the Top Down 🏡

Roof underlayment might not be the most visible part of your roofing system, but it plays a vital role in keeping your home safe and dry. Whether you opt for traditional asphalt-saturated felt or a high-tech synthetic underlayment, the choice you make can significantly impact your roof’s performance and longevity.

When planning your roofing project, take the time to consider your climate, roofing material, and budget. Consult with roofing professionals to determine the best underlayment type for your specific needs. By choosing the right underlayment and ensuring a proper installation, you’ll be protecting your home from the top down for years to come! 

Contact Kornerstone Roofing today to connect with our expert team of roofers and experience top-notch craftsmanship and customer service. We can’t wait to get started on your next roofing project!

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