ASCEND Composite Cladding is engineered to provide exceptional impact resistance compared to many traditional siding materials. Manufacturer testing shows compliance with ASTM D4226 impact testing and identifies the product as achieving a Class 4 impact rating—the highest classification under that standard. While no exterior cladding can be described as hail-proof, ASCEND is designed to withstand severe weather better than many conventional siding products when properly installed.

ASCEND Performance Guide

Is ASCEND Resistant to Hail?

Hail is one of the most destructive weather events affecting residential exteriors throughout the Midwest. In Iowa and Illinois, homeowners routinely experience storms capable of damaging roofing, gutters, windows, vehicles, and traditional siding materials.

Because siding is the home's first line of defense, impact resistance has become an important consideration during exterior remodeling. ASCEND Composite Cladding was engineered with a glass-reinforced polymer surface and graphite-infused polystyrene core that provide exceptional rigidity and durability. Current manufacturer literature states that the product has achieved a Class 4 impact rating under ASTM D4226, the highest classification within that impact-resistance standard.¹

Hail Resistance at a Glance

Question	Answer
Is ASCEND hail-proof?	No. No exterior cladding should be described as completely hail-proof.
Is it impact resistant?	Yes. Manufacturer literature states ASCEND achieved a Class 4 impact rating under ASTM D4226.
Does installation matter?	Yes. Proper fastening, wall preparation, and installation are essential for overall system performance.
Should homeowners inspect after hail?	Yes. Even when no visible siding damage is present, roofing, flashing, gutters, windows, and other exterior components should be inspected after significant storms.

What Does a Class 4 Impact Rating Mean?

ASTM D4226 is a standardized laboratory test that evaluates the resistance of siding products to impact. A Class 4 rating represents the highest impact classification identified by the manufacturer for ASCEND under this testing protocol.

While this testing demonstrates excellent impact resistance, laboratory testing should not be interpreted as a guarantee that every real-world hailstorm will produce identical results. Storm intensity, hail characteristics, and installation conditions vary significantly from one project to another.¹

Factors That Influence Hail Damage

Hail diameter
Ice density and shape
Wind speed
Impact angle
Building height
Roof overhangs
Nearby structures and trees
Installation quality

Why Composite Construction Matters

Unlike traditional siding materials that may become brittle or crack under severe impact, ASCEND combines a glass-reinforced polymer exterior with graphite-infused polystyrene insulation. This engineered construction contributes to the product's stiffness, durability, and impact performance while also providing thermal benefits and dimensional stability.²

Composite Construction Benefits

Glass-reinforced polymer face
Graphite-infused EPS insulation
High rigidity
Excellent dimensional stability
Resistance to moisture-related deterioration
Durable low-gloss finish

Potential Sources of Damage

Extremely large hail
Wind-driven debris
Tree limbs
Flying construction materials
Improper installation
Damaged substrates

Hail Resistance Is Only One Part of Storm Performance

Severe storms rarely involve hail alone. High winds, wind-driven rain, debris, and rapid pressure changes all affect the building envelope. A durable cladding system should therefore be installed as part of a properly detailed wall assembly that includes structural sheathing, a weather-resistive barrier, flashing, and approved fasteners.

Even when the siding survives a storm without visible damage, homeowners should inspect the complete exterior because hidden water intrusion can originate from damaged flashing or roofing components rather than the cladding itself.³

Does a Class 4 Rating Reduce Insurance Premiums?

Some insurance companies offer discounts for homes with impact-resistant roofing products or qualifying exterior materials, but discounts vary by carrier, policy, state, and underwriting requirements.

Homeowners should contact their insurance provider to determine whether a Class 4-rated cladding product qualifies for any available incentives. Contractors should avoid promising premium reductions unless confirmed by the homeowner's insurer.

After a Hailstorm, Inspect These Areas

☐ Roofing shingles
☐ Ridge caps
☐ Flashing
☐ Gutters and downspouts
☐ Window trim
☐ Exterior doors
☐ Soffits and fascia
☐ ASCEND panels and accessories
☐ Caulking and sealants where applicable
☐ Landscaping and nearby structures

Installation Still Matters

Impact-resistant materials cannot compensate for poor workmanship. Panels should be installed over sound structural sheathing using the approved fasteners, spacing, and installation procedures described in the manufacturer's installation guide. Proper wall preparation helps the complete assembly perform as intended during severe weather.³

Common Misconceptions About Hail Resistance

A Class 4 rating does not mean the product is indestructible.
Impact resistance does not eliminate the need for inspections after severe storms.
The siding is only one component of the building envelope.
Proper installation remains essential for long-term performance.
Insurance discounts are determined by the insurer—not the siding manufacturer.

Contractor Storm-Ready Checklist

☐ Inspect wall framing and sheathing.
☐ Install a continuous weather-resistive barrier.
☐ Follow current ASCEND installation instructions.
☐ Use approved fasteners.
☐ Verify flashing details.
☐ Inspect roof-to-wall intersections.
☐ Confirm accessory installation.
☐ Photograph completed work for project records.

The Bottom Line

ASCEND Composite Cladding is engineered to deliver outstanding impact resistance and is identified by the manufacturer as achieving a Class 4 impact rating under ASTM D4226. Although no exterior cladding should be described as hail-proof, ASCEND is designed to better withstand severe weather than many conventional siding materials when installed according to current manufacturer instructions.

Homeowners should view hail resistance as one part of a complete exterior system. Sound wall construction, proper installation, quality flashing, and routine post-storm inspections all contribute to long-term durability and protection.

Prepare for Midwest Storms with Suburban Wholesale & Supply

Suburban Wholesale & Supply helps contractors and homeowners throughout Eastern Iowa and Western Illinois select durable exterior cladding systems designed for Midwest weather. Our team can assist with ASCEND product information, material takeoffs, accessory selection, and current installation resources for projects where long-term durability is a priority.

Is ASCEND Resistant to Hail? | ASCEND Composite Cladding Guide