Demystifying Roofing Underlayment: Everything You Need to Know

PP Roofing Sheets Exporters in Ahmedabad might not be the star of the show when it comes to building or repairing a roof, but it’s certainly the unsung hero. Often overshadowed by flashy shingles or intricate designs, underlayment plays a crucial role in protecting your home from water damage and ensuring the longevity of your roof. In this comprehensive guide, we’ll delve into the world of roofing underlayment, answering common questions and shedding light on its importance.


What is Roofing Underlayment?

Roofing underlayment is a layer of material installed directly onto the roof deck before the shingles or other roofing materials are applied. It serves as a secondary barrier against moisture, adding an extra level of protection to your roof. While it may seem like a simple component, its role in waterproofing and enhancing roof durability cannot be overstated.


Types of Roofing Underlayment:

There are primarily two types of Roof Synthetic Underlayment Suppliers in Ahmedabad: asphalt-saturated felt and synthetic.

Asphalt-Saturated Felt:

Asphalt-saturated felt, also known as felt paper or tar paper, has been a staple in roofing for decades.

Made from a base material such as paper or fiberglass saturated with asphalt, it provides excellent waterproofing properties.

It’s available in different weights, with heavier weights offering better durability and resistance to tearing.

Synthetic Underlayment:

Synthetic underlayment is a more modern alternative to traditional felt paper.

Constructed from polyethylene or polypropylene, it offers superior tear resistance and durability compared to asphalt-saturated felt.

Synthetic underlayment is lightweight, making it easier to handle and install, especially in windy conditions.

It also has a longer lifespan and provides better protection against UV rays.


Benefits of Roofing Underlayment:

Waterproofing: Synthetic Roofing Underlayment Manufacturers in India acts as a waterproof barrier, preventing water from seeping into the roof deck and causing damage to the structure of the roof.

Added Protection: It provides an extra layer of protection against wind-driven rain, ice dams, and snow infiltration.

Enhanced Durability: By shielding the roof deck from moisture, underlayment helps prolong the lifespan of the roof and reduces the risk of premature deterioration.

Improved Energy Efficiency: Certain types of underlayment, such as reflective synthetic materials, can help improve energy efficiency by reducing heat transfer through the roof.

Peace of Mind: Knowing that your roof is equipped with a reliable underlayment can give you peace of mind, especially during severe weather events.



Roofing underlayment may not be the most glamorous aspect of roof construction, but its importance cannot be overstated. Whether you’re building a new roof or replacing an old one, investing in quality underlayment is essential for ensuring the longevity and integrity of your roof. By understanding the different types of underlayment available and following best practices for installation, you can protect your home from water damage and enjoy a durable, weather-resistant roof for years to come.


FAQs About Roofing Underlayment:

Is roofing underlayment necessary?

Yes, roofing underlayment is essential for protecting your home from water damage. It acts as a waterproof barrier, preventing moisture from penetrating the roof deck and causing leaks.

Can I install new shingles without replacing the underlayment?

While it’s possible to install new shingles over existing underlayment in some cases, it’s generally recommended to replace the underlayment to ensure proper waterproofing and longevity of the roof.

How long does roofing underlayment last?

The lifespan of roofing underlayment depends on various factors such as the type of material used, climate, and installation method. Generally, asphalt-saturated felt may last around 15-30 years, while synthetic underlayment can last 25-50 years.

Can I install roofing underlayment myself?

While DIY installation is possible, it’s crucial to follow manufacturer guidelines and ensure proper installation techniques to avoid mistakes that could compromise the effectiveness of the underlayment.

Should I use asphalt-saturated felt or synthetic underlayment?

The choice between asphalt-saturated felt and synthetic underlayment depends on factors such as budget, climate, and personal preference. Synthetic underlayment offers superior durability and performance but may come at a higher cost.