Product Overview
A sustainable, cork-based coating designed for both new construction and renovation projects. Suitable for single-family, multi-family, commercial, and industrial applications, it adheres to nearly any wall substrate and provides exceptional thermal and acoustic performance.

Key Features:

• Made in the USA

• Certified by QAI Laboratories (California)

• Class A Fire-Rated (ASTM E84)

• Available in Custom Colors

• Cork-Based and Sustainable

• Certified in U.S. & Canada (CERus-1015)

• Application-Specific Warranty

• Provides Thermal Performance Benefits

• Product Designation: DuroPro Cork Barrier – CERus-1015

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Product History & Performance Attributes

Developed to give builders, owners, and developers a durable, sustainable, and thermally protective coating, DuroPro Cork Barrier leverages the natural benefits of cork for modern building envelopes.

Performance Attributes:

• Thermal barrier properties

• ASTM E84 Class A fire rating

• Water- and insect-resistant

• UV- and weather-resistant

• Sound-absorptive and lightweight

• Flexible and non-toxic

• Water-based for easy cleanup

• Adheres to most substrates (excluding vinyl)

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Code Compliance

• Approved for both interior and exterior use under 2021 / 2018 / 2015 IBC & IRC

• Resistant to fungal growth per ASTM G21

• Class A interior finish (flame spread ≤ 25 | smoke ≤ 450 per ASTM E84)

• Approved for use in fire-resistance-rated wall assemblies (interior-facing orientation)

• Application thickness: two passes at 60 mils (1.5 mm) each

• Not intended for below-grade applications

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Design Considerations

• Non-structural finish coating — no structural design required

• Serves as a finish layer within the wall assembly

• Can be integrated into fire-rated or non-fire-rated wall systems

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Installation and Application

• General Guidelines:

• Follow manufacturer instructions and building codes

• Substrate must be clean, dry, and debris-free

• Recommended temperature: Above 40 °F (4 °C)

• Approved substrates: cementitious systems, stucco, plaster, concrete, CMU

• Two-Coat Process:

• First Pass – Coverage Coat (60 mils wet film)

• Second Pass – Texture Coat (after 12–24 hrs drying depending on ambient conditions)

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Fire-Resistance Rated Construction

• May be applied to fire-resistance-rated walls from the interior-facing fire side without reducing rating

• Approved Construction Types: IAB, IIAB, IIIB, IVAB, VAB1

• Approved Uses: Exterior and Interior Finish

• Limitations:

• Fire separation > 10 ft (3048 mm)

• Max height 40 ft (12.2 m) above grade

• NFPA 268 testing not required

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New Construction Applications

• When used over new stucco substrates:

• Convert to a “one-coat” stucco system

• Finish to a smooth, paint-ready surface before applying DuroPro Cork Barrier