Why a Moisture Barrier Is Critical in Florida

Homes in Jacksonville and Northeast Florida are constantly exposed to:

• High humidity
• Heavy rainfall
• Wind-driven rain during storms
• Rapid temperature changes

Even properly installed siding is not completely waterproof. Small gaps, seams, and penetrations can allow moisture to get behind the siding.

A properly installed water-resistive barrier acts as a second line of defense, helping keep your home dry and protected.

What Happens If Underlayment Is Installed Incorrectly?

This is one of the most common issues we see on siding projects.

If the underlayment is missing, damaged, or installed incorrectly, moisture can become trapped behind the siding. Over time, this can lead to:

• Mold and mildew growth
• Rotting wood and sheathing
• Interior wall damage
• Decreased energy efficiency

In many cases, homeowners don’t realize there’s a problem until significant damage has already occurred.

Our Siding Underlayment Installation Process

At D&D Construction Services, we don’t just install siding — we install a complete exterior system designed to protect your home long-term.

Our process includes:

• Full removal of existing siding
• Inspection of the underlying structure
• Replacement of any rotted or damaged sheathing
• Installation of a high-quality water-resistive barrier
• Sealing seams and taping joints properly
• Flashing around windows, doors, and penetrations

This ensures your siding system performs the way it’s supposed to — not just visually, but structurally.

Types of Siding Underlayment We Use

There are several types of weather-resistant barriers used in siding systems. We select the right material based on your home and project needs.

Common options include:

• HardieWrap® – Designed specifically for fiber cement siding systems
• Tyvek® House Wrap – A widely used breathable moisture barrier
• Felt Paper – Traditional option used in certain applications

Each option provides protection, but proper installation is what makes the biggest difference.

Why HardieWrap Is a Popular Choice

HardieWrap is engineered to provide strong moisture protection while allowing your home to breathe.

Its micro-porous design allows water vapor to escape while preventing liquid water from entering. This helps reduce the risk of condensation buildup, mold, and structural damage.

It also contributes to a tighter building envelope, which can improve your home’s energy efficiency by reducing air infiltration.

Do You Need New Underlayment When Replacing Siding?

In most cases, yes.

When siding is removed, it exposes the underlying structure. This is the best time to inspect and replace the underlayment to ensure everything is properly protected moving forward.

If your home has any signs of moisture damage or previous improper installation, replacing the underlayment is essential.

How Long Does Siding Underlayment Last?

When installed correctly, a high-quality weather-resistant barrier can last for decades. However, its lifespan depends on:

• Proper installation
• Exposure to moisture
• Overall condition of the structure

That’s why it’s important to work with an experienced contractor who installs the full system correctly.

Why Homeowners in Jacksonville Choose D&D Construction Services

We focus on doing the job right — not just making it look good.

• Full system installation (not just siding)
• Strong focus on moisture protection
• Experienced with Florida-specific conditions
• High-quality materials and workmanship
• Backed by warranties for peace of mind