---
title: MAXTERRA® Becomes First MgO Panel with ICC-ES Acoustical Certification for Both Wood and CFS Framing
description: MAXTERRA® becomes the first MgO panel with ICC-ES acoustical certification for both wood and cold-formed steel framing, achieving STC ratings up to 59. Download ESL-1645 now.
---

[Nexgen Building Products Insights ](https://nexgenbp.com/insights)

# [MAXTERRA® Becomes First MgO Panel with ICC-ES Acoustical Certification for Both Wood and CFS Framing](https://nexgenbp.com/insights/esl-1645-press-release)

 Written by [NEXGEN](https://nexgenbp.com/insights/author/nexgen) | Jul 17, 2025 8:52:05 PM

*FOR IMMEDIATE RELEASE *

New ESL-1645 listing certifies MAXTERRA® for both wood and cold-formed steel floor assemblies, delivering STC ratings up to 59 and giving architects a proven acoustic solution for any framing system.

BRADENTON, Fla. (July 17, 2025) — NEXGEN Building Products, LLC, today announced that MAXTERRA® magnesium oxide panels have received ICC-ES Listing Report ESL-1645 for acoustical performance in floor-ceiling assemblies. The comprehensive listing covers both wood and cold-formed steel (CFS) framing systems, making MAXTERRA® the only MgO structural subfloor certified by ICC-ES for both wood and CFS framing with verified acoustical performance.

> *"This certification represents our commitment to rigorous testing and transparent performance data,"* said Eric Polzin, Chief Construction Science Officer at NEXGEN. *"ESL-1645 gives architects and specifiers the verified acoustical data they need to confidently specify MgO panels in sound-critical applications."*

## Acoustical Performance Snapshot

- STC ratings: 55-59 across tested assemblies
- IIC ratings: 50-58 for impact sound control
- Three certified configurations: Wood truss, CFS truss, and underlayment systems
- Multiple floor finishes: LVP, LVT, engineered wood, and carpet tile options

The ESL-1645 testing program evaluated MAXTERRA® panels in floor-ceiling assemblies per ASTM E90 and ASTM E492 standards, with results that meet or exceed the acoustical requirements for multifamily, hospitality, and commercial construction. Significantly, the certification includes cold-formed steel framing—a capability that differentiates MAXTERRA® from competing products that are limited to wood-only applications.

> *"Steel framing is becoming more and more common in multifamily and commercial construction, but many rated acoustical assemblies stop at wood systems,"* added Ryan Miller, Vice President of Multifamily & Commercial Construction at NEXGEN. *"ESL-1645 removes that limitation. MAXTERRA® is now the only MgO structural subfloor verified by ICC-ES for acoustical performance for both wood and steel framing systems."*

The listing covers three distinct assembly types: structural floor panels over wood trusses (MOS-1645-01), structural floor panels over cold-formed steel trusses (MOS-1645-02), and underlayment panels over wood structural panels (MOS-1645-03). This comprehensive coverage allows design teams to specify MAXTERRA® with confidence across diverse project types and construction methods.

> *"We've invested heavily in testing because claims without data don't build buildings,"* emphasized Scott Lidberg, CEO of NEXGEN. *"ESL-1645 represents extensive, rigorous laboratory testing, and the results speak for themselves. MAXTERRA® delivers both structural performance and acoustical control."*

MAXTERRA® panels are already recognized as the most thoroughly tested MgO product line in North America, with certifications including structural performance (ESR-5194), fire resistance, and environmental transparency through a third-party verified EPD. The addition of acoustical certification under ESL-1645 further solidifies NEXGEN's position as the industry leader in high-performance, rigorously validated MgO building materials.

Download ESL-1645 and explore MAXTERRA®'s complete certification portfolio at [www.nexgenbp.com/resources](https://www.nexgenbp.com/resources).

## About NEXGEN

NEXGEN Building Products is a leading innovator in high-performance magnesium oxide (MgO) building materials. A safer, stronger, healthier way to build. The MAXTERRA® product line delivers superior fire, water, mold, and impact resistance while setting new standards for durability, sustainability, and transparency. Through relentless testing, third-party certification, and continuous innovation, NEXGEN is providing tomorrow's building solutions today.

[View full post](https://nexgenbp.com/insights/esl-1645-press-release)

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