Roof Leaks and Moore Logo
Home | Blog | What Do Roofers Put Under Shingles

What Do Roofers Put Under Shingles

An image showcasing the layers beneath shingles: a moisture barrier, ice and water shield, underlayment, and flashing

Table of Contents

In the realm of roofing, the layer beneath shingles plays a crucial role in protecting the structure from the elements. Whether you are a homeowner or a roofing professional, understanding what goes under the shingles is essential for ensuring a durable and long-lasting roof.

This article explores the significance of underlayment and the various materials used by roofers. By comparing synthetic and asphalt underlayment and discussing the installation process, readers will gain valuable insights into the benefits of proper underlayment usage.

Importance of Underlayment

Underlayment is a crucial component in roofing installations. It serves as a protective layer between the roof deck and the shingles, providing an additional barrier against moisture, wind, and other external elements. The importance of underlayment cannot be overstated, especially when serving customers who desire long-lasting and reliable roofing solutions.

One of the primary functions of underlayment is to prevent water infiltration. It acts as a secondary waterproofing layer, ensuring that any water that may penetrate the shingles is directed away from the roof deck and into the gutters or drainage system. This helps to prevent water damage, mold growth, and structural issues.

Additionally, underlayment enhances the overall durability and lifespan of the roof. It provides an extra layer of protection against potential damage caused by heavy rain, hail, or wind-driven debris. By serving as a sacrificial layer, underlayment can absorb the impact and protect the underlying roofing materials, prolonging the life of the roof.

Types of Underlayment Materials

Roofers use various types of materials as an underlayment to provide an added layer of protection for the roof deck and shingles.

The choice of underlayment material depends on factors such as climate, roof slope, and budget.

The most commonly used underlayment material is asphalt-saturated felt, also known as tar paper. It is affordable, easy to install, and provides moderate protection against moisture.

Synthetic underlayment, made from materials like polypropylene or polyester, is becoming increasingly popular due to its superior durability and resistance to tearing. It also offers better protection against water infiltration.

Another option is rubberized asphalt underlayment, which provides excellent adhesion and flexibility. It is commonly used in areas with extreme weather conditions.

Additionally, there are specialized underlayment materials available for specific roofing applications, such as ice and water shield underlayment for protection against ice dams.

Choosing the right underlayment material is crucial for ensuring the longevity and performance of the roof.

Synthetic Vs. Asphalt Underlayment

There are distinct differences between synthetic and asphalt underlayment materials used by roofers.

Synthetic underlayment is a modern alternative to traditional asphalt underlayment. It is made from a combination of polymers and fiberglass, giving it superior strength and durability. Synthetic underlayment is lightweight, easy to install, and provides excellent protection against water and moisture. It also offers better resistance to tearing and UV rays compared to asphalt underlayment.

On the other hand, asphalt underlayment is made from organic or fiberglass material coated with asphalt. It is a cost-effective option and provides good protection against water and moisture. However, it is heavier, requires more labor to install, and is less resistant to tearing and UV rays compared to synthetic underlayment.

Ultimately, the choice between synthetic and asphalt underlayment depends on factors such as budget, climate, and personal preference.

Installation Process for Underlayment

During the installation process for underlayment, roofers typically begin by carefully inspecting the roof surface for any potential issues or damage. This step is crucial to ensure that the underlayment will be properly installed and will effectively protect the roof from elements such as water, wind, and UV rays.

Once the roof surface has been inspected and any necessary repairs have been made, the roofers will proceed to lay down the underlayment material. They will start at the bottom edge of the roof and work their way up, overlapping each row of underlayment to create a watertight barrier.

The underlayment is secured to the roof using nails or staples, ensuring that it is firmly attached and will not shift or tear during the installation of the shingles. This meticulous process ensures that the underlayment provides a reliable and durable layer of protection for the roof.

Benefits of Proper Underlayment Usage

Proper usage of underlayment offers a range of benefits, ensuring enhanced protection for the roof surface.

One of the primary advantages of using underlayment is its ability to provide an additional layer of waterproofing. This helps to prevent water infiltration, which can lead to costly damage and repairs.

Underlayment also acts as a barrier against ice dams, which can form in colder climates and cause water to seep into the roof.

Additionally, underlayment helps to improve the overall durability of the roof by providing a buffer between the shingles and the roof deck. This helps to reduce the risk of damage from foot traffic during installation or maintenance.

Frequently Asked Questions

How Long Does Underlayment Typically Last Before It Needs to Be Replaced?

Underlayment typically lasts between 20 to 30 years before it needs to be replaced. It serves as a protective barrier between the shingles and the roof deck, providing an added layer of insulation and moisture protection. Regular inspections are recommended to ensure its effectiveness.

Is Underlayment Necessary for All Types of Roofing Materials?

Underlayment is essential for all types of roofing materials. It provides an additional layer of protection against moisture, ice, and heat, ensuring the longevity and durability of the roof. It also helps in maintaining energy efficiency and preventing leaks.

Can Underlayment Be Installed Over Existing Shingles?

Underlayment can be installed over existing shingles, but it is not recommended. It is best to remove the old shingles before installing new underlayment to ensure proper adhesion and prevent potential issues with moisture and ventilation.

What Are the Signs of a Damaged Underlayment?

Signs of damaged underlayment include leaks, water stains on ceilings or walls, mold or mildew growth, and visible damage to the underlayment itself. Prompt repair or replacement is necessary to maintain the integrity of the roof.

Are There Any Specific Guidelines for Underlayment Installation in Extreme Weather Conditions?

In extreme weather conditions, specific guidelines for underlayment installation should be followed to ensure its effectiveness. These guidelines may include using a high-quality underlayment material, proper installation techniques, and additional weatherproofing measures to enhance its durability and performance.

Jeremy Newkirk

Jeremy Newkirk

Owner Of Roof Leaks & Moore