Skip to main content
Where to Buy

Fewer trades on site. Quicker to install. EXACOR™ has the industry abandoning gypsum underlayment.

Contact a Rep Request a Sample

01 EXACOR Product Applications

One Board. Zero Hassle.

Subflooring
Underlayment
Wall Sheathing

02 What Is MgO

Magnesium oxide (MgO) offers simple strength and streamlined installation for a building panel with exceptional workability.

MgO panels are cementitious panels that are primarily made of inorganic materials reinforced with layers of glass fiber mesh. EXACOR™ MgO panels are manufactured to provide a streamlined solution for strength, fire resistance and sound performance.

Learn More About MgO

Request a Sample

  • Speed & Ease of Installation

    Installs with just a single trade and can eliminate the need for gypsum underlayment.

  • Sound Absorption

    Can help achieve sound ratings when used as a part of a STC/IIC-tested floor/ceiling assembly.

  • Fire Resistance[1]

    Provides fire resistance as part of fire-resistance-rated floor/ceiling assemblies.

  • Dimensional Stability

    Withstands exposure to moisture and does not warp, expand, cup or delaminate like other (wood) panels do.

  • Inherent Strength

    Contains a proprietary layered mesh reinforcement for added structural value.

  • Quality Assurance

    Manufactured under a quality control program with inspections by ICC-ES and Underwriters Laboratory (UL) to ensure consistent product performance.

  • Optimize Material & Labor Costs

    High-performing material that may save time and help reduce materials and trades needed to install.

03 Why EXACOR

Materials matter when you’re installing floors. See why professionals are abandoning gypsum underlayment for EXACOR.

General Contractors
Architects
Owners
“It was faster than laying just traditional subfloor. Time is money and if we can save time on one job, let alone all our jobs, that really adds up.”

Todd Hardy Supervisor for TDK Construction

“Magnesium oxide boards tend to perform better than gypsum concrete. How much better do they perform? A lot better.”

Christine Williamson M. Arch., Assoc. AIA Instructor, Building Science for Architects

“At TDK Construction, everything we build, we own. Our owner and developer are all about getting it done, and they were super happy with the results.”

Todd Hardy Supervisor for TDK Construction

04 Documents

Resource Library

Get general and in-depth info about EXACOR, including installation manuals, data sheets and architectural specs for the applications of EXACOR™ underlayment, subflooring and wall sheathing.

  • EXACOR Fire & Sound Assemblies Handbook

    This document explains and illustrates different sound and fire assemblies using EXACOR underlayment, subflooring and wall sheathing.

    Download

  • 3-Part Spec (Short Form) Section 06 16 26 | EXACOR Underlayment

    This 3-part specification uses CSI Masterformat™ for architectural specs in regard to the applications of EXACOR underlayment.

    Download

  • 3-Part Spec (Short Form) Section 06 16 23 | EXACOR Subflooring

    This 3-part specification uses CSI Masterformat™ for architectural specs in regard to the applications of EXACOR subflooring.

    Download

  • 3-Part Spec (Short Form) Section 06 16 00 | EXACOR Wall Sheathing

    Correctly specify EXACOR exterior wall sheathing and its installation using this detailed guide.

    Download

  • Code Recognition for EXACOR Subflooring | ESR-4634

    ESR-4634 provides information on structural performance, durability and surface burning characteristics for EXACOR™ subflooring.

    Download

  • EXACOR Wall Sheathing Structural Recognition ESR 4635

    Review the International Code Council Evaluation Service’s technical descriptions and key property evaluations of EXACOR™ MgO sheathing panels for use in approved assemblies.

    Download

  • BXUV.L528 Fire-Rated Assembly using EXACOR Underlayment | UL Assembly

    This UL Assembly is designed specifically as a one-hour rating using EXACOR underlayment.

    Download

  • BXUV.L601 Fire-Rated Assembly using EXACOR Subflooring | UL Assembly

    This UL Assembly is designed specifically as a one-hour interior rating using EXACOR subflooring.

    Download

  • BXUV.L602 Fire-Rated Assembly using EXACOR Subflooring | UL Assembly

    This UL Assembly is designed specifically as a one-hour interior rating using EXACOR subflooring.

    Download

  • EXACOR Fire Resistance Assemblies ESL 1290

    Learn how EXACOR™ MgO sheathing panels meet the performance criteria in conformance with the International Code Council Evaluation Service’s evaluation.

    Download

  • Sales Sheet | EXACOR Underlayment

    Learn how EXACOR underlayment is a sound choice to help keep projects on time with high-quality acoustical performance and speedy installation.

    Download

  • Sales Sheet | EXACOR Subflooring

    Learn how to get structural and acoustical performance from a single trade with EXACOR subflooring.

    Download

  • Installation Manual | EXACOR Wall Sheathing

    Proper installation of MgO wall sheathing panels is simple using this general overview of its applications in approved assemblies.

    Download

  • Sales Sheet | EXACOR Wall Sheathing

    Learn how high-performing, time-saving MgO panels for wall sheathing can help reduce materials and trades needed to install.

    Download

  • Installation Manual | EXACOR Underlayment

    This Installation Manual covers basic installation recommendations for EXACOR underlayment.

    Download

  • Installation Manual | EXACOR Subflooring

    This Installation Manual covers basic installation recommendations for EXACOR subflooring.

    Download

  • Safety Data Sheet | EXACOR | English

    The Safety Data Sheet (SDS) list all of the materials used within the EXACOR products.

    Download

  • Contractor Checklist | EXACOR Underlayment

    This checklist outlines the important observations and practices to perform successfully when installing EXACOR underlayment.

    Download

  • Fact Sheet | EXACOR Panels

    Get an overview of EXACOR’s benefits and applications and learn about its structural and functional performance.

    Download

  • 10-Year Limited Warranty | EXACOR Products | 10-Year Limited

    This document explains the warranty for EXACOR products.

    Download

05 Education Options

Learning & Education

Interested in discovering more about magnesium oxide panels and the benefits EXACOR could bring to your multifamily jobsite? Explore learning opportunities below.

Home Building Crossroads Webinar – Acoustic Control in Multifamily Construction

Explore the intersection of performance variables and design implications.

Learn More

1 AIA CE – Magnesium Oxide (MgO) Floor & Wall Panels for Multifamily Buildings

Meet the chemical and molecular formula revolutionizing multifamily structure design-builds.

Learn More

1 AIA CE – Code-Recognized MgO Panel Applications for Acoustic and Fire-Rated Systems

Compare and contrast MgO panel sound- and fire-rated assemblies for multifamily projects.

Learn More

06 Warranty

Warranty Information

See our 10-Year Limited Warranty. Limitations and Restrictions may apply.

View Warranty