You can’t see it, and most of us don’t even know that it’s there. However, when it comes to your roof, one of the most important yet often overlooked components of a reliable roofing system is the roofing underlayment. Underlayment is the silent defense that helps your roof endure all types of weather. It sits between the roof deck and shingles to provide additional protection against water, moisture, and the elements.
Two of the most common types of underlayment materials are felt and synthetic. If you’re planning a new roof installation or replacement, understanding the key differences between these materials is essential in making the right decision for your home.
Let’s break down the pros and cons of felt and synthetic roofing underlayment so you can decide which is best for your roof replacement or installation.
A Closer Look at Underlayment
Before diving into the specifics of felt vs. synthetic, let’s look more in-depth about what roofing underlayment does. Underlayment is the waterproof or water-resistant layer installed on top of the roof deck before applying the roofing shingles. It serves as an extra barrier to the elements, especially when the shingles get damaged or compromised by wind, hail, or debris.
Roofing underlayment helps prevent water infiltration, which can cause leaks, mold, mildew, and even structural damage. It also acts as a secondary layer of defense in case your shingles fail or wear out, offering valuable peace of mind.
What is Felt Underlayment?
Felt underlayment, also known as tar paper, has been the standard for roofing for decades. Made from a paper or fiberglass mat, it’s saturated with asphalt to provide its waterproofing capabilities. Felt underlayment comes in two primary weights: 15-pound and 30-pound. The weight refers to the thickness and density of the felt, with 30-pound felt offering a stronger, more durable option than 15-pound felt.
Benefits of Felt Underlayment:
- Cost-Effective: Felt is an affordable choice for budget-conscious homeowners, typically costing less than comparable synthetic underlayment.
- Proven Track Record: Builders have used felt in roofing for over a century, and it remains a trusted material in the industry.
- Ease of Installation: Felt is relatively simple to install, which can help reduce labor costs.
Drawbacks of Felt Underlayment:
- Less Durable: Felt is more vulnerable to damage from the elements, especially UV exposure. It can degrade over time due to exposure to sunlight, heat, and moisture, reducing its effectiveness as a protective layer.
- Water Absorption: Felt can absorb water, which can weaken the material and create the potential for leaks or water infiltration. It may not be the best option for homes in areas with heavy rainfall or snow.
- Tears Easily: Felt is more prone to tearing during installation or if exposed to foot traffic, which can compromise the integrity of your roofing system.
What is Synthetic Underlayment?
Synthetic roofing underlayment is a newer and more advanced option made from high-strength polymers, typically polypropylene or polyester. Unlike felt, artificial underlayment is much more durable and effective at protecting your home.
Benefits of Synthetic Underlayment:
- Durability: Synthetic underlayment is highly resistant to tearing, UV rays, and moisture. It maintains its strength and effectiveness for a longer period than felt.
- Water Resistance: Synthetic materials do not absorb water as felt does. That’s why synthetic materials are a more reliable option for homes in areas with frequent rain, snow, or humidity.
- Lightweight: Notably lighter than felt alternatives, synthetic underlayment is easier to handle, which can reduce labor and installation time.
- Increased Protection: Synthetic underlayment provides superior weather resistance and protection, preventing moisture buildup, mold growth, and leaks.
Drawbacks of Synthetic Underlayment:
- Higher Cost: Synthetic underlayment is generally more expensive than felt, which can increase the overall cost of your roofing project.
- More Complex Installation: While synthetic underlayment is easy to handle, some types require specific installation methods, such as the use of special fasteners or adhesives, making the process more complex.
Which Is Better for Your Roof?
There is no one right answer for every home or homeowner. Choosing between felt and synthetic roofing underlayment depends on your priorities and the specific conditions of your home. There are three factors you should consider before selecting your underlayment.
First is the climate. If you live in an area prone to heavy rain, snow, or ice, synthetic underlayment is likely the better option. Its moisture resistance and durability make it ideal for homes in Utah or other locations with harsh winters.
Second, if you’re looking for a more affordable roofing solution and don’t mind replacing your underlayment sooner, felt underlayment can still provide decent protection, especially in mild climates. However, be sure to research roofing companies with payment plans to explore your options. A payment plan may give you the financial leverage you need to upgrade to synthetic underlayment.
Finally, how long do you plan to stay in the home? Synthetic underlayment offers greater value over time due to its longevity, water resistance, and superior performance. If you plan to stay in your home long-term, a synthetic is a better investment.
The Right Choice for Your Roof
Both felt and synthetic roofing underlayment have their advantages and drawbacks, but synthetic underlayment offers superior protection, longevity, and performance, especially in areas prone to extreme weather conditions. While it may come at a higher upfront cost, its ability to withstand moisture, UV rays, and physical wear makes it the best long-term option for most homeowners.
To ensure the highest level of protection for your home and roof, synthetic roofing underlayment is the clear choice. It provides peace of mind, knowing your roof will be better equipped to handle the elements, keeping your home safe, dry, and energy-efficient.
For professional guidance on choosing the best underlayment for your roof, contact BigHorn Roofing. Our expert team can help you make the best choice for your home’s needs, ensuring your roof is well-protected and lasts.