Synthetic Underlayment Vs Felt (2024 Roofing Guide)
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Synthetic Underlayment vs Felt (2024 Roofing Guide)

Posted by Northface Construction

When it comes to roofing, many homeowners focus on the visible elements like shingles, flashing, and gutters. However, there’s a critical component hidden beneath the surface that plays a vital role in protecting your home from the elements – roof underlayment.

In this blog post, we’ll break down:

What is Roof Underlayment?

installing roof underlayment

Roof underlayment, also known as roofing felt or simply underlayment, is a crucial layer installed between the roof deck (plywood or OSB) and the roofing material (shingles, tiles, metal panels, etc.). Its primary purpose is to provide an additional barrier against moisture infiltration, protect against wind-driven rain, and improve the overall durability and longevity of the roofing system.

Why is Roof Underlayment Important?

Signs You Need to Replace Your Underlayment

Over time, roof underlayment can deteriorate due to exposure to the elements. Here are some signs that indicate it’s time toreplace your underlayment:

Synthetic Underlayment vs. Felt Underlayment

Now that we understand the importance of roof underlayment let’s comparetwo common types: synthetic underlayment and felt underlayment.

Synthetic Underlayment

Synthetic underlayment is a relatively newer technology in the roofing industry. It’s made from materials like polyethylene or polypropylene, which are lightweight, durable, and resistant to moisture. Here are some of the pros and cons of synthetic underlayment:

✅ Pros of Synthetic Underlayment:

❌ Cons of Synthetic Underlayment:

Felt Underlayment

Felt underlayment, also known as asphalt-saturated felt paper, has been a staple in roofing for many years. It’s made from organic or fiberglass materials impregnated with asphalt. Let’s explore the advantages and disadvantages of felt underlayment:

✅ Pros of Felt Underlayment:

❌ Cons of Felt Underlayment:

The Cost of Different Underlayment Styles

The cost of roof underlayment can vary significantly based on the material, quality, and brand. Here’s a general overview of the cost considerations for synthetic and felt underlayment:

Synthetic Underlayment:

On average, synthetic underlayment can cost between $0.15 to $0.50 per square foot. While it’s more expensive upfront, its durability and moisture resistance can result in long-term savings on potential repairs.

Felt Underlayment:

Felt underlayment is typically more affordable, ranging from $0.08 to $0.25 per square foot. However, it may require more frequent replacement, which can increase long-term costs.

It’s essential to factor in the total cost of your roofing project, including the underlayment, when making your decision. While synthetic underlayment may have a higher initial cost, it can offer better protection and durability in the long run, potentially saving you money on future repairs.

Get Your Roofing Underlayment Installed By A Top-Notch Roofing Contractor

carrying underlayment

Choosing the right roof underlayment is a crucial decision that can impact the longevity and performance of your roofing system. Synthetic underlayment offers several advantages in terms of durability and moisture resistance, while felt underlayment is a more budget-friendly option. Consider your specific needs, budget, and climate when deciding which underlayment material is the best fit for your roofing project. Regardless of your choice, investing in quality underlayment is a wise decision to protect your home from the elements and ensure a long-lasting roof.

Contact Northface Construction to get your underlayment installed correctly!


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