Moisture resistance is one of the biggest advantages of ASCEND Composite Cladding. Unlike wood siding, ASCEND will not absorb water, rot, or support fungal decay. Its glass-reinforced polymer exterior and graphite-infused EPS core are engineered to resist moisture, but proper flashing, weather-resistive barriers, and installation remain essential for protecting the complete wall system.

ASCEND Performance Guide

Does ASCEND Absorb Moisture?

One of the most common causes of exterior siding failure is moisture. Water that becomes trapped behind or inside siding can contribute to rot, swelling, paint failure, mold growth, and costly structural repairs. That's why moisture performance is an important consideration when selecting any exterior cladding system.

ASCEND Composite Cladding is engineered to resist moisture. Unlike traditional wood siding, it does not absorb water in a way that causes swelling, rot, or biological decay. Its composite construction combines a glass-reinforced polymer exterior with a graphite-infused expanded polystyrene (GPS/EPS) insulating core that is not susceptible to wood rot or fungal deterioration.¹

Moisture Performance at a Glance

Question	Answer
Will ASCEND absorb water like wood?	No. ASCEND's composite construction is designed to resist moisture absorption and will not rot like wood.
Can it swell from moisture?	It is engineered for dimensional stability and is not subject to moisture-related swelling associated with wood products.
Does it replace house wrap?	No. ASCEND is supplemental exterior cladding and must be installed over a code-compliant weather-resistive barrier.

Why Moisture Resistance Matters

Rain, melting snow, humidity, and condensation are unavoidable parts of a home's environment. Exterior cladding should resist moisture while allowing the wall assembly behind it to manage incidental water through proper drainage and drying.

Because ASCEND contains no wood fibers, it is not vulnerable to the moisture-related deterioration commonly associated with untreated wood siding. The manufacturer also notes that ASCEND will not rot, making it well suited for climates that experience frequent rain, snow, and seasonal humidity.²

Benefits of Moisture-Resistant Cladding

Resists rot and decay
Will not absorb moisture like wood siding
Maintains dimensional stability
Helps preserve appearance over time
Suitable for humid and freeze-thaw climates

ASCEND Is Part of a Complete Wall System

Although ASCEND resists moisture, it is not designed to serve as the home's primary weather barrier. The wall assembly still depends on properly installed structural sheathing, flashing, a code-compliant weather-resistive barrier, and correct installation practices to manage water effectively.

Manufacturer installation instructions require ASCEND to be installed over an approved weather-resistive barrier with properly integrated flashing around windows, doors, roof intersections, and other penetrations.³

Moisture Protection Checklist

☐ Install a continuous weather-resistive barrier.
☐ Flash windows and doors correctly.
☐ Follow manufacturer clearance requirements.
☐ Use approved accessories and fasteners.
☐ Keep drainage paths open.
☐ Follow the current ASCEND Installation Guide.

Ideal for Midwest Weather

Homes throughout Iowa and Illinois experience heavy rain, snow, spring storms, and repeated freeze-thaw cycles. Choosing a cladding material that resists moisture-related deterioration helps reduce maintenance concerns over the life of the home.

While no exterior product can compensate for improper flashing or water trapped within the wall assembly, ASCEND's composite construction eliminates many of the moisture concerns associated with traditional wood siding.

ASCEND Support From Suburban Wholesale & Supply

Suburban Wholesale & Supply helps contractors, builders, and homeowners throughout the Quad Cities, Eastern Iowa, and Western Illinois select complete ASCEND Composite Cladding systems. Our team can assist with product selection, accessories, technical literature, installation resources, and material takeoffs to help ensure every project begins with the right products and current manufacturer documentation.

The Bottom Line

ASCEND Composite Cladding is engineered to resist moisture and will not rot or absorb water like traditional wood siding. Its composite construction provides excellent durability in wet and humid climates while maintaining long-term dimensional stability.

However, moisture-resistant cladding is only one part of a durable exterior. Proper wall preparation, flashing, weather-resistive barriers, and installation practices remain essential to protecting the building envelope. Following the manufacturer's published installation instructions helps ensure the complete wall system performs as intended.

Does ASCEND Absorb Moisture? | Moisture Resistance Explained