MAXTERRA® All Products Brochure.
The complete product line, including specifications, certifications, applications, and system-level performance data.
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As expectations for custom homes evolve, architects, builders, and homeowners are looking beyond traditional materials to meet demands for durability, moisture resistance, fire protection, and healthier indoor environments. ICC-ES-evaluated MAXTERRA® MgO panels are designed to address these needs in interior and exterior wall applications, as well as floors.
Related Resources for
Single-Family Homes
Whether you are building one custom home or a community of them, these guides help your team evaluate MAXTERRA® for the project.
Skip-the-Gyp Application Guide
Explore dry-installed floor systems as an alternative to wet-laid gypsum.
Download Guide →
MagRock® Brochure.
The paperless interior wall board for garages, humidity-prone rooms, and high-use spaces.
View Brochure →
Cold-Formed Steel Framing Application Guide.
For builders using or considering CFS framing, with code-ready wall and floor documentation.
Download Guide →Where Conventional Materials Fall Short
Material choices for a custom home start with its location and how each space will be used. Local exposure to wind, water, and wildfire matters alongside indoor humidity and the demands of premium finishes.
Combustible sheathing in wildfire country. Conventional wood sheathing remains combustible, even when treated with fire retardants.
Wood sheathing takes on water during the build. OSB and plywood can swell or delaminate with prolonged exposure to rain and humidity before the home is dried in.
Paper-faced gypsum gives mold a food source. In kitchens, bathrooms, pool rooms, and other humidity-prone spaces, drywall’s paper facing can support mold growth when moisture is present.
Garages need to stand up to hard use. Vehicles, tools, and storage can leave standard drywall dented and gouged.
VOCs can affect indoor air quality. Many conventional building materials release volatile organic compounds (VOCs), which can contribute to indoor air pollution.
Chloride-based MgO boards can create corrosion risks. Boards made with magnesium oxychloride (MOC) can absorb moisture and leach chloride that corrodes fasteners and framing.
The 
Advantage
MAXTERRA® brings multiple performance benefits together in a single panel, helping builders address the conditions outside the home and the demands of the spaces within it.
Fire performance for walls and floors. MAXTERRA® structural wall sheathing and structural floor panels are classified as non-combustible under ASTM E136. MAXTERRA® underlayment, backer board, and MagRock® Premium Wall Board provide fire-resistant options for interior applications. This fire performance comes from the panels’ composition, without added fire-retardant treatments or coatings.
Rides out job-site weather. MAXTERRA® MgO boards are designed to resist moisture-related swelling and warping. They can be exposed to weather during construction for up to 200 days, depending on the product.*
*Visit our Resources page for product-specific exposure limits and warranty requirements.
Mold-resistant. MagRock® Premium Wall Board has no paper facing to support mold growth and showed zero mold growth in ASTM G21 testing.
Durability for demanding spaces. MagRock® Premium Wall Board provides a durable, paperless surface for garages and other high-use areas.
Healthier materials. MAXTERRA® MgO boards are VOC-free and quartz silica-free. MAXTERRA® structural wall sheathing and MagRock® Premium Wall Board are also Red List Free, with no added formaldehyde.
MOS, not MOC. 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.
One System. Walls to Floors.
Single Layer Structural Floor Panel
3/4" MAXTERRA® structural floor panel replaces OSB subfloor in a single dry layer for upper floors, on wood or cold-formed steel joists.
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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
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Fire- and Water-Resistant Underlayment
1/2" MAXTERRA® underlayment installs over the subfloor as a fire- and water-resistant base for tile, natural stone, and other finished flooring in interior dry areas.
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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 on exterior wall framing. Non-combustible per ASTM E136, with wind and shear values for wood framing under ESR-5193. Also installs on cold-formed steel as non-structural sheathing and in ESL-1568 fire-rated steel wall assemblies.
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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
Paperless interior wall and ceiling board for living spaces, garages, and other high-use areas. MagRock® can be taped, finished, primed, and painted using the materials and methods in its installation guide. Class A surface-burning performance and zero mold growth observed under ASTM G21.
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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
CODE & COMPLIANCE
Get Spec'd. Get Approved.
The most highly certified MgO product on the market. Backed by ICC-ES evaluation reports, published test data, and a verified EPD, not marketing claims.
ICC-ES ESR-5193
Exterior Sheathing, Noncombustible Construction.
Covers MAXTERRA® MgO sheathing for exterior wall applications, including wind and shear load values for wood framing. Noncombustible per ASTM E136, with a supplement for the 2023 Florida Building Code.
ICC-ES ESL-1568
Fire-Rated Wall Assemblies.
One- and two-hour load-bearing wall assemblies with MAXTERRA® structural wall sheathing, listed for both wood and cold-formed steel framing.
ICC-ES ESR-5506
MagRock® Premium Wall Board, Class A Interior Finish.
ASTM E84 Class A per ESR-5506, with a Flame Spread Index of 0, Smoke Developed Index of 5, and zero mold growth per ASTM G21 (MagRock® technical data sheet).
ICC-ES ESR-5192
Floor Underlayment, Fire-and-Water-Resistant.
Covers MAXTERRA® underlayment installed over subfloor. Addresses surface-burning characteristics, durability, and structural floor-load performance.
ICC-ES ESR-5194
Structural Floor Panel, Single Layer System.
Span ratings, load tables, and deflection criteria for your structural engineer, on wood or cold-formed steel joists.
ICC-ES ESL-1645
Acoustic Assemblies, STC and IIC Rated.
Compare tested floor/ceiling assemblies for controlling voices, television sound, and footsteps between levels. Includes wood and cold-formed steel systems, with STC 55 to 59 and IIC 50 to 58. Ratings apply to the complete listed assembly.
EPD VERIFIED
Environmental Product Declaration.
The only MgO panel with a verified Environmental Product Declaration (EPD) for the North American market. VOC-free, quartz silica-free, and made from mineral-based materials.