The underlayment is an often overlooked yet necessary component when it comes to roofing systems. Serving as a protective barrier between your roof deck and the shingles, underlayment plays a vital role in ensuring the durability and performance of your roof. In this blog post, we will explain the importance of roofing underlayment, the different types available, and how they contribute to the overall performance of your roof.

Importance of Roofing Underlayment

1. Moisture Barrier:

• One of the primary functions of underlayment is to act as a moisture barrier. It prevents water from infiltrating your home in the event of damaged or missing shingles, protecting the roof deck and interior spaces from water damage.

2. Secondary Defense:

• Underlayment provides an additional layer of protection against harsh weather conditions. It acts as a secondary defense against wind-driven rain, ice dams, and other elements that can compromise the integrity of your roof.

3. Enhanced Durability:

• Underlayment contributes to the overall durability and lifespan of your roofing system by adding an extra layer of protection. It helps prevent issues such as rot, mold, and structural damage, ensuring your roof remains in good condition for years to come.

4. Fire Resistance:

• Some types of underlayment are designed to provide fire resistance, adding extra safety to your home. This can be particularly important in areas prone to wildfires.

Types of Roofing Underlayment

1. Asphalt-Saturated Felt:

• Traditional asphalt-saturated felt, also known as tar paper, is one of the most common types of underlayment. It is made from a combination of asphalt and natural or synthetic fibers. Available in different weights, such as 15-pound and 30-pound, felt underlayment provides a basic level of protection against moisture and is relatively affordable.

2. Synthetic Underlayment:

• Synthetic underlayment is made from woven or spun polyethylene or polypropylene. It is more durable and lightweight than asphalt-saturated felt. Synthetic underlayment offers superior tear resistance, better moisture protection, and less wrinkling, making it a popular choice for modern roofing systems.

3. Rubberized Asphalt Underlayment:

• A rubberized asphalt underlayment is a high-performance option that provides excellent moisture and ice protection. It typically features a self-adhesive backing, allowing it to form a watertight seal. This underlayment is often used in areas prone to ice dams or heavy rain, as it provides superior protection against water infiltration.

4. Non-Bitumen Synthetic Underlayment:

• This type of underlayment is made from polymers and does not contain asphalt. It offers similar benefits to synthetic underlayment, such as durability, moisture resistance, and lightweight properties. Non-bitumen synthetic underlayment is also UV-resistant, making it suitable for extended exposure during construction.

Contribution to Overall Roof Performance

1. Improved Water Resistance:

• Underlayment enhances the water resistance of your roofing system by providing an additional barrier against moisture. This helps prevent leaks, rot, and other water-related issues that can compromise the integrity of your roof and home.

2. Increased Roof Longevity:

• Underlayment plays a crucial role in extending the lifespan of your roof. Protecting the roof deck and other structural components from moisture damage helps maintain the overall health and durability of your roofing system.

3. Enhanced Energy Efficiency:

• Some types of underlayment, such as synthetic options, offer better insulation properties. This can contribute to improved energy efficiency by reducing heat transfer and keeping your home cooler in the summer and warmer in the winter.

4. Additional Protection During Installation:

• Underlayment provides temporary protection for the roof deck against weather elements during the roofing installation process. This is particularly important if shingle installation is delayed, as it helps prevent water damage to the exposed roof deck.

5. Compliance with Building Codes:

• Using the appropriate underlayment ensures compliance with local building codes and manufacturer warranties. Many roofing manufacturers require specific types of underlayment to validate their warranties, making it essential to choose the suitable material for your roofing project.

Roofing underlayment is a vital component of any roofing system, providing essential protection against moisture, enhancing durability, and contributing to overall roof performance. Understanding the different types of underlayment and their benefits can help you make informed decisions about your roofing needs. Whether you’re installing a new roof or replacing an existing one, ensuring the proper underlayment is used will help safeguard your home and extend the lifespan of your roof.