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EXACOR® Wall Sheathing

EXACOR wall sheathing panels are fire-resistant, high-density, structural magnesium oxide cement panels. When used as an exterior wall sheathing, EXACOR® panels can replace other sheathing materials in certain assemblies, potentially reducing the number of layers required.

EXACOR wall sheathing can be used in exterior walls of Type III construction greater than 40 feet in height above grade plane when used in accordance with the applicable NFPA 285–compliant designs as listed in ESL-1290. EXACOR sheathing is not approved for use on Type I or II buildings except as noted in ESR-4635

  • Sheathing Panel, 1/2" × 4' × 8'

  • Sheathing Panel, 1/2" × 4' × 9'

  • Sheathing Panel, 1/2" × 4' × 10'

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01 Products

Sheathing Panel, 1/2" × 4' × 8'

Panel Count 38
Fire Resistance ASTM E119, ANSI/UL 263
Structural ESR-4635

Sheathing Panel, 1/2" × 4' × 9'

Panel Count 33
Fire Resistance ASTM E119, ANSI/UL 263
Structural ESR-4635

Sheathing Panel, 1/2" × 4' × 10'

Panel Count 32
Fire Resistance ASTM E119, ANSI/UL 263
Structural ESR-4635
Nominal Product Thickness Nominal Panel Size Panel Count Weight (lbs./sq. ft.) Max Support Spacing Edge/Field Spacing[3] Maximum Allowable Shear Values (plf)[4] [5] [6] [7] [8] [9] Transverse Wind Loads (psf)[6] [7] [10] Fire-Resistance-Rated Assemblies[11] Code Evaluation Report
(12 mm)

4' × 8'
(1219 mm × 2438 mm)

4' × 9'
(1219 mm × 2750 mm)

4' × 10'
(1219 mm × 3050 mm




2.7 24" 4/6" 230 +/-38

Exterior Load-Bearing Wall:
MOS-1290-04 (ESL-1290, 1 hour)
MOS-1290-06 (ESL-1290, 2 hours)

Wall and Partition:
MOS-1290-07 (ESL-1290, 2 hours)
MOS-1290-08 (ESL-1290, 2 hours)
ESR 4635

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

  • Fire Resistance

    Inherently fire resistant throughout and provides fire resistance as part of fire resistance–rated wall and floor/ceiling assemblies.

  • Durability

    Tough enough to handle jobsite conditions, 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 Laboratories (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.

04 Warranty

Enhanced Experience

If you’re building a multifamily or light commercial project, register your project and complete a preconstruction meeting to access the full range of technical support and warranty benefits for your build, including a transferrable warranty. Review full warranty details and access project registration at the link below.

View Warranty

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