Best Roofing Underlayment Options for Homes in Moline, IL

If you’re planning a roof replacement in Moline, IL, you’re probably focused on shingles. The color. The style. The warranty.

But here’s something most homeowners don’t think about until there’s a leak: what is roofing underlayment, and does it really matter?

In the Quad Cities, where we deal with heavy rain, ice dams, and freeze-thaw cycles, underlayment isn’t just a technical detail. It’s your roof’s backup protection.

At Quality Construction Advantage Group, we walk homeowners through the entire roofing system, not just what you see from the street. Let’s break down what underlayment does, your roofing underlayment options, and how to choose the right one for your home.

Key Takeaways

• Roofing underlayment is a moisture barrier installed beneath shingles.
• The right underlayment protects against leaks, ice dams, and wind-driven rain.
• Choosing the right material in Moline can extend your roof’s life and prevent costly damage.

If you’re unsure what’s under your shingles, or if it’s time to upgrade, our team is here to help.

What Is Roofing Underlayment and Why Does It Matter in Moline?

Let’s start with the basics: what is roofing underlayment?

Roofing underlayment is a protective layer installed between your roof deck (the wood structure) and your shingles. It acts as a secondary water barrier in case moisture gets past your shingles.

And in Moline, that matters more than you might think.

Between:

• Spring storms
• Strong Mississippi River winds
• Heavy snow
• Ice dams in winter

Your roof takes a beating. Shingles are your first defense. Underlayment is your second.

If water slips past damaged shingles or wind pushes rain under the edges, underlayment helps stop moisture from soaking into the wood decking. Without it, leaks can lead to:

• Mold in your attic
• Rotting roof decking
• Ceiling stains
• Expensive structural repairs

If you’ve ever wondered, is roofing underlayment necessary for my roof, the answer is yes, both for code compliance and long-term protection. Illinois building codes require it because shingles alone are not waterproof.

Underlayment isn’t optional. It’s essential protection, especially in Midwest climates.

Important Factors to Consider Before Choosing Roofing Underlayment Options

If you’re replacing your roof, this is the time to choose the right underlayment. Here are the key things to think about.

Climate Exposure: What Does Moline Weather Throw at Your Roof?

We see freezing winters, hot summers, and heavy storms. Your underlayment needs strong moisture resistance and durability.

Roof Slope: Is Your Roof Steep or Low-Slope?

Steeper roofs shed water faster. Lower slopes need stronger waterproofing layers.

Ice Dam History: Have You Had Winter Leaks?

If you’ve dealt with ice dams before, rubberized underlayment along eaves may be a smart upgrade.

Budget: What Makes Sense Long-Term?

Felt underlayment costs less upfront. Synthetic options cost more but last longer and resist tearing.

Longevity Goals: How Long Do You Plan to Stay?

If you want maximum lifespan, investing in higher-performance materials pays off.

You don’t need to make this decision alone. A professional inspection helps determine how to tell if I need roofing underlayment replaced or upgraded during your roofing project.

Comparing Roofing Underlayment Options for Moline Homes

Let’s walk through the three most common roofing underlayment options.

Asphalt-Saturated Felt

The traditional option. Still widely used.

Pros:

• Budget-friendly
• Proven track record
• Good short-term protection

Cons:

• Can wrinkle when wet
• Heavier and easier to tear
• Less durable than modern materials

Felt works well in many situations but may not hold up as well under extreme Midwest conditions.

Synthetic Underlayment

A newer, high-performance option made from polypropylene or polyethylene.

Pros:

• Lightweight
• Tear-resistant
• More water-resistant than felt
• Handles extreme weather better

Cons:

• Higher upfront cost than traditional felt
• Can be slippery during installation if not textured
• May require manufacturer-specific fasteners

Rubberized Asphalt (Peel-and-Stick)

The most waterproof option.

Pros:

• Self-sealing around nails
• Excellent ice dam protection
• Strong moisture barrier

Cons:

• Higher cost
• Usually used in targeted areas

In Moline, rubberized asphalt is commonly installed along roof edges and valleys to prevent ice dam leaks.

How to Tell If I Need Roofing Underlayment Replaced

If your roof is older or you’ve had recurring leaks, you may be wondering how to tell if you need roofing underlayment replaced.

Signs include:

• Water stains in the attic
• Soft or rotting decking
• Repeated winter ice dam issues

Underlayment isn’t visible once shingles are installed. That’s why replacement time is the right time to upgrade it.

Skipping this layer, or choosing the lowest-grade option, can cost far more in the long run.

The Bottom Line for Moline Homeowners

So let’s bring it back to the core question: what is roofing underlayment, and why should you care?

It’s your roof’s safety net.

It protects your home when shingles fail.

And in Midwest weather, it’s one of the most important parts of your roofing system.

If you’re replacing your roof, this is your opportunity to choose wisely. The right underlayment improves durability, prevents leaks, and extends roof life.

Quick Homeowner Checklist

• Confirm the underlayment type in your estimate
• Ask about ice dam protection at eaves
• Consider synthetic options for durability
• Schedule a professional inspection before replacing

If you’re unsure about your current system, we’re happy to take a look.

FAQs About What Is Roofing Underlayment