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Everything You Need to Know About Roof Underlayment

Roof underlayment is an important part of your roof that helps protect your home from water damage. It is a layer of material that is installed underneath the shingles or other roofing materials. This article will discuss everything you need to know about roof underlayment.

1. Purpose of Roof Underlayment
Roof underlayment serves multiple purposes. It acts as a waterproof barrier, preventing water from seeping into your home. It also helps to protect your roof from wind-driven rain and ice dams. In addition, it provides an extra layer of insulation, which can help reduce heating and cooling costs.

2. Types of Roof Underlayment
Different types of roof underlayment are available, including asphalt felt, synthetic underlayment, and rubberized asphalt. Asphalt felt is the most commonly used type of reinforced paper or fiberglass. Synthetic underlayment is more durable and resistant to tearing compared to asphalt felt. A rubberized asphalt is a premium option that offers superior waterproofing capabilities.

3. Installation Process
Professional roofers typically install roof underlayment during the roof installation process. It is laid over the roof deck before the shingles or other roofing materials are installed. The underlayment is secured using nails or staples, and overlaps are sealed to ensure a watertight seal.

4. Importance of Quality Underlayment
Using high-quality roof underlayment is crucial for the longevity and durability of your roof. Inferior underlayment may not protect against water leaks or withstand severe weather conditions. Investing in a quality underlayment can extend the lifespan of your roof and provide peace of mind, knowing that it is well-protected.

5. Signs of Damaged Underlayment
Over time, roof underlayment can become damaged due to wear and tear, exposure to the elements, or poor installation. Signs of damaged underlayment include water stains on your ceiling, mold or mildew growth, and missing or damaged shingles. If you notice any of these signs, having your underlayment inspected and repaired or replaced is essential.

6. Maintenance and Repairs
Regular maintenance is critical to ensuring the effectiveness of your roof underlayment. Inspect your roof regularly for any signs of damage, such as cracks, tears, or uplifted edges. Promptly addressing any issues and making necessary repairs can help prevent further damage and protect the integrity of your roof.


Roof underlayment is an important part of your roof that helps keep your home safe and dry. It’s a special material that goes on the roof deck before adding other roofing materials. Its job is to stop water from leaking into your home and causing damage. It also protects the roof deck from getting damaged by the tar on the shingles.


Asphalt-saturated felt, also known as “tar paper” or “felt paper.”
It is made with asphalt, polyester, and plant fibers. This underlayment is water-resistant but not completely waterproof. It works well on steep roofs where water flows easily down but not on flat roofs where water might stay and seep through. It is cheaper but doesn’t lay dull and can get damaged easily.

Synthetic underlayments also have a rough surface to prevent slipping. It is waterproof, flexible, and resistant to mold and UV rays. Another type is synthetic underlayment. Most roofers prefer this type because it is more durable. It has a synthetic base soaked in asphalt and coated with fiberglass, making it stronger and less likely to tear.

rubberized asphalt underlayment. This is the most expensive type, but it provides the best protection. It is made with rubber and asphalt polymers, which make it extra waterproof. Rubberized underlayment usually has a sticky back that creates a seal between the roof and the underlayment. It is self-adhesive, flexible, and can handle extreme temperatures.