MAXTERRA® All Products Brochure.
The complete product line, including specifications, certifications, applications, and system-level performance data.
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MAXTERRA® MgO Cement Panels support multifamily projects with non-combustible exterior wall sheathing, abuse resistant interior wall boards, and structural, fire-rated, and sound-deadening floor assemblies that eliminate wet-laid gypsum. ICC-ES evaluated, UL fire-rated, and proven in the field.
Related Resources for
Multifamily Construction
These guides help your team evaluate MAXTERRA® products and floor systems for multifamily projects.
Multifamily and Hotel Application Guide
Compare MAXTERRA® underlayment and single-layer structural floor systems for multifamily and hotel projects.
Download Guide →
Skip-the-Gyp Application Guide
Explore dry-installed floor systems as an alternative to wet-laid gypsum.
Download Guide →
Cold-Formed Steel Framing Application Guide.
For builders using or considering CFS framing, with code-ready wall and floor documentation.
Download Guide →Why Wet-laid Gypsum Keeps Costing You More
Multifamily developers and GCs are caught between IBC Type III code requirements and a wet-trade floor system that fights your schedule at every turn.
5–7 day (or more) cure cycle per floor. Wet-laid gypsum locks in waiting time at every level, compressing your ability to sequence trades efficiently.
Moisture damage and callbacks. Wet-laid gypsum introduces bulk water during construction, a leading cause of mold, delaminated flooring, and post-occupancy warranty claims.
Subcontractor mobilization risk. Wet-laid gypsum requires a specialty sub. Scheduling conflicts, material shortages, or quality disputes can halt your entire project.
MOC chemistry. Some MgO boards use magnesium oxychloride (MOC) formulas, which may corrode fasteners and framing members and fail industry standards.
FRTW compliance ambiguity. Fire-retardant-treated wood is a combustible material treated after the fact, not inherently noncombustible, despite common field assumptions.
The 
Advantage
Our MOS (magnesium oxysulfate) chemistry delivers what your project schedule, code inspector, and ownership group all need from a single product system.
Dry Installation. No water introduced to the building envelope, ever. Full floor system installs with standard fasteners in one trade sequence.
Inherently Non-combustible. ASTM E136 classified, not a treated combustible material. Qualifies for Type III exterior wall applications as referenced by the IBC.
ICC-ES evaluated. ESR-5193 (sheathing), ESR-5192 (underlayment), ESR-5194 (structural floor panel), ESR-5506 (MagRock® Premium Wall board). Documentation ready for plan review and field inspection.
MOS chemistry. MAXTERRA uses magnesium oxysulfate chemistry and is designed for moisture resistance, dimensional stability, and reduced chloride-related corrosion risk compared to chloride-based MgO products.
UL H531, 2-hour rated. Full assembly rating achieved with fewer layers than competing products. Simplifies procurement and inspection while saving money.
Still pouring a wet slurry?
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Single Layer Structural Floor Panel
3/4" MAXTERRA® Structural Floor Panel replaces both OSB subfloor and wet-laid gypsum in a single layer. Maximum schedule compression, zero wet trade, zero separate topping layer.
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Thickness 3/4" - span rating 24" OC
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Load capacity 133 psf at L/600 deflection
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ASTM E136 Non-Combustible MOS chemistry
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ICC-ES ESR-5194
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UL H531 2-Hour Rated
Fire- and Water-Resistant Underlayment
1/2" MAXTERRA® underlayment installs over existing OSB subfloor, set by your framing sub in the same pass. Eliminates wet-laid gypsum subcontractor, 5-7 day (or more) cure time, moisture risk, and flooring adhesion failures in one product swap.
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Thickness 1/2" - installs over existing OSB
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No cure time - dry install, no wet trade
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ICC-ES ESR-5192
Structural Wall Sheathing
Replaces OSB or plywood sheathing and gypsum sheathing on exterior wall framing. Noncombustible per ASTM E136, qualifying for Type III exterior wall applications as referenced by the IBC. No FRTW substitution arguments. Available in 1/2" and 5/8" for CFS and wood-frame applications.
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Thickness 1/2" & 5/8" - CFS & wood framing
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ASTM E136 Noncombustible - MOS chemistry
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ICC-ES ESR-5193
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MagRock® Premium Wall Board
Interior wall panel replacing standard gypsum panel products. ASTM E84 Class A rated. ASTM G21 mold resistance - 0 growth observed. MOS chemistry, designed for moisture resistance and reduced chloride-related corrosion risk.
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Thickness 3/8", 1/2", 5/8"
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ASTM E84 Flame Spread 0, Smoke 5 - Class A
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ICC-ES ESR-5506 replaces interior gypsum
Proven on Real Projects
MAXTERRA® has been specified and installed on
Multifamily Projects across the country.
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CLEBURNE, TEXAS
Alps Cleburne Apartments
Project Type
Class A Garden-Style Multifamily
Product
MAXTERRA® Single Layer Structural Floor Panels
Framing Type
Wood-Framed Construction
Location
Cleburne, Texas
Units
266
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PLANT CITY, FLORIDA
The Henry Apartments
Project Type
Multifamily Residential
Product
MAXTERRA® Single Layer Structural Floor Panels
Framing Type
Cold-Formed Steel (CFS) Framing
Location
Plant City, Florida
Units
96
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DOVER, DELAWARE
Metro Properties Multifamily
Project Type
Multifamily
Product
1/2” MAXTERRA® Flooring Underlayment
Framing Type
Wood-Framed Construction
Location
Dover, Delaware
Application
Underlayment over OSB Subfloor
"The biggest benefit we found was that we saved 2-3 weeks on our construction schedule by using this product."
Megan Leatherwood,
Construction Superintendent at Trafalgar Homes
View All Project Spotlights →
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CODE & COMPLIANCE
Get Spec'd. Get Approved.
The most highly certified MgO product on the market. Every claim backed
by ICC-ES evaluation reports and UL assembly listings, not marketing claims.
ICC-ES ESR-5193
Exterior Sheathing, Type III Compliance
Covers MAXTERRA® MgO sheathing for exterior wall applications on CFS and wood-frame construction. Noncombustible per ASTM E136, qualifying for Type III exterior wall applications as referenced by the IBC. This is the report that ends the FRTW conversation before it starts.
ICC-ES ESR-5192
Floor Underlayment, Fire-and-Water-Resistant
Covers MAXTERRA® 1/2" underlayment installed over OSB subfloor as a wet-laid gypsum replacement. Addresses fire performance, structural contribution, and moisture resistance. Provides the documentation path for permit submission on floor-ceiling assemblies.
ICC-ES ESR-5194
Structural Floor Panel, Single Layer System
Covers MAXTERRA® 3/4" single-layer structural floor panel as a combined replacement for OSB subfloor and wet-laid gypsum. Span rating, load tables, and deflection criteria included, everything your structural engineer needs for the floor framing plan. .
UL H531
2-Hour Fire-Rated Floor-Ceiling Assembly
Full UL-listed 2-hour fire-rated assembly for CFS truss construction with MAXTERRA® floor panel and single layer of ceiling gypsum. Fewer components than competing H-series assemblies, simpler procurement, simpler inspection, same rating.
ICC-ES ESR-5506
MagRock® Premium Wall Board - Interior Fire Resistance
Covers MagRock® MgO wall board for interior wall applications as a replacement for traditional gypsum panels. ASTM E84 Flame Spread Index of 0, Smoke Developed Index of 5. Zero mold growth per ASTM G21. The documentation path for interior fire-resistant wall assemblies without gypsum.
EPD VERIFIED
Environmental Product Declaration
The only MgO panel with a verified Environmental Product Declaration (EPD) for the North American market. Contributes to LEED v4 credit pathways including MR Credit: Building Product Disclosure and Environmental Product Declarations. VOC-free, quartz silica-free, and manufactured through a low-carbon mineral-based process.
UL L528
1-Hour Fire-Rated Floor-Ceiling Assembly
UL-listed 1-hour fire-rated floor-ceiling assembly for wood open truss construction. Refer to the listing for the specified materials and installation requirements.