MagBoard - The Complete Guide To Magnesium Oxide Boards (MgO)

High Quality MagBoard MgO Magnesium Oxide Boards

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magboard quarter inch
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1/4 in Magboard MgO Magnesium Oxide Board

$23.78per panel
Panel Dimensions: 1/4" (6mm) x 4 ft x 8 ft
Common Uses: Walls & Ceilings
Item Number: 691324728529
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magboard half inch
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1/2 in Magboard MgO Magnesium Oxide Board

$32.23per panel
Panel Dimensions: 1/2" (12mm) x 4 ft x 8 ft
Common Uses: Walls & Ceilings
Item Number: 691324728536
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magboard three quarter inch
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3/4 in Magboard MgO Magnesium Oxide Board

$49.11per panel
Panel Dimensions: 3/4" (20mm) x 4 ft x 8 ft
Common Uses: Sub-flooring
Item Number: 691324728543
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Inside, Outside, Floor, Ceiling, Walls… MagBoard is today’s super building material

In case you haven't heard, there's a new multi-purpose building material available nationwide across the U.S. MagBoard is a versatile, eco-friendly Magnesium Oxide Board, also called MgO panels, with a wide range of construction applications beginning with the inside for wall, ceiling and subflooring (for example tile backer), and outside for exterior trim, to roof decking, and lap siding.

  • mgo board quarter inch
  • mgo board half inch
  • mgo board three quarter inch
  • mgo board
  • mgo board building
MagBoard Magnesium Oxide Boards
Length 8'
Width 4'
Thicknesses 3 OPTIONS:
1/4" (6mm) (walls/ceilings)
1/2" (12mm) (walls/ceilings)
3/4" (20mm) (sub-flooring)
Surface Smooth front surface, sanded back surface

MagBoard can be used in most construction, on wood frame, metal frame and SIP panel assemblies.

Use virtually any finish you prefer including paint, stucco, plaster, wallpaper and more.

MagBoard’s antimicrobial characteristics make it resistant to mold, mildew, fungus and rot. The perfect indoor Air Quality wallboard.

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Where MagBoard is Used Indoors

MagBoard Used As Ceiling
Wall treatment glued to MagBoard.
MagBoard used as sub-flooring / tile backer
magnesium boards mgo indoors uses

Where MagBoard is Used Outdoors

Roofing / tiles secured to MagBoard
Siding / sheathing secured to MagBoard
magnesium boards mgo outdoors uses
MagBoard is highly resistant to fire, insects, fungus, mold, mildew and chemicals

MagBoard Compared to Other Building Materials

MagBoard is different from other building materials because it is highly resistant to fire, insects, fungus, mold, mildew and chemicals. It is an environmentally friendly and non toxic product. Use the charts below to compare the applications and features of MagBoard to other common building panels. You will find that MagBoard offers superior performance in every category compared to other building products.

Applications MagBoard MgO Oriented Strand Board (OSB) Exterior Gypsum Sheathing Dry Wall Cement Siding
Fire Resistant Walls
As a part of Structural Insulated Panel
Structural Sheathing

MagBoard is extremely environmentally friendly and consumes less energy compared to similarly used materials to reduce the environmental footprint. It is noncombustible, which helps protect homeowners, tenants, and building occupants while mitigating damage and loss. MagBoard provides all of these features in one remarkable product.

Features MagBoard MgO Oriented Strand Board (OSB) Plywood Cement Board
Environmentaly Friendly High Poor Average Average
Combustibility Zero High High Zero
Flame Resistance High Poor Poor High
Freeze/Thaw Resistance High Average Average Average
Impact Resistance High Average Average Poor
Mold and Mildew Resistance High Poor Poor High
Termite Resistance High Poor Poor High
Water Resistance High Poor Poor High

Benefits of MagBoard MGO Magnesium Oxide Boards

fire resistant magnesium oxide boards
Fire Resistant

Sustainable, fire resistant building material for commercial and residential construction. MagBoard is UL 055 and ASTM-tested and A-rated (highest fire rating).

waterproof magnesium oxide boards
Water Resistant

MagBoard maintains its structural stability when and will not warp, swell or delaminate when exposed to moisture for short periods of time. Long period exposure to moisture however is not recommended.

health safety of magesium oxide boards
Health Safe

Safe for people who suffer from allergies or asthma or who are chemically sensitive. It does not contain fly ash, formaldehyde, crystalline silica or toxins.

magboard mgo panel termite proof
Termite Proof

MagBoard is not a food source for termites, carpenter ants or other wood boring insects. It is completely inorganic and contains zero foodstuff.

environmentally friendly magnesium oxide boards
Environmentally Safe

MagBoard is not made with any toxic materials and is completely recyclable. Acts as a nutrient when it is ground up and sprinkled into the soil.

magboard heat resistance
Environmental Exposure

MagBoard is freeze/thaw tested for 36 months. Build anytime of the year.

magBoard mgo panel fungus resistant
Fungus Resistant

MagBoard’s antimicrobial characteristics make it resistant to mold, mildew, fungus and rot.

builder friendly magboard mgo
Builder Friendly

Stronger, more durable and lighter than other products, beautiful finishes, unmatched screw and nail holding capabilities, scores and cuts easily.

The many benefits of using Ambient MagBoards MgO

  • Structural Floors
  • Sound Proofing
  • Structural Walls
  • Fire-Rated Floor & Wall
  • Assemblies
  • Mold/Fungus Resistant
  • Moisture Resistant
  • Termite/Vermin Resistant
  • Quick and Easy Installation
  • Dimensionally Stable
  • Traditional Edge Details
  • Weather Resistant
  • Noncombustible
  • Abuse Resistant
  • Lightweight

MagBoard… the strongest, healthiest, multipurpose building material available

Indoor Uses
Outdoor Uses
applications of magnesium boards mgo panels

One Board… Multiple Applications

MagBoard eliminates many challenges consumers, architects, builders, contractors and engineers face with residential, commercial and industrial construction. It comes in many different densities and strengths making it suitable for different applications and uses. It is used to replace a variety of other building materials including pressed board, gypsum board, oriented strand board (OSB), plywood, and cement board.

Easy to Install & Use
  • The boards can be scored and snapped, sawed, drilled, and fastened to wood or steel framing. The back surface is sanded for easy tile application.
  • For building construction, MagBoard is available in a variety of sizes and thickness.
  • Unlike other board or panel building material, MagBoard is not a paper-faced material.
  • Instead numerous versions and value of grades exist including smooth face, rough texture, utility, and versatile grades.
  • It generally comes in a light gray, white or beige color but it can be painted any color.
mgo easy to install
Ideal for high-traffic areas
  • MagBoard is ideal for many applications especially for high-traffic, abuse-prone infrastructures such as multifamily units with stairways, entries and common areas, school classrooms, corridors, gyms and college dorms, hospitals and healthcare facilities.
  • MagBoard’s antimicrobial characteristics make it resistant to mold, mildew, fungus and allergens.
  • The product is also ideal for high traffic areas like retail malls and stores, government buildings, military facilities, and transportation facilities.
magboards in hospitals and health facilities

MagBoard is an extremely versatile product

magnesium oxide board director cabin
magnesium oxide board meeting room
Meeting Rooms
magnesium oxide board classrooms
magnesium oxide board building shafts
Building Shafts
magnesium oxide board warehouse
magnesium oxide board lt-panel-room
LT Panel Rooms
magnesium oxide board datacenter
magnesium oxide board hospital
magnesium oxide board control room
Control Rooms
magnesium oxide board kitchen
magnesium oxide board wet areas
Wet Areas
magnesium oxide board hotel room
Hotel Rooms
Equipment Shelters
Equipment Shelters
Modular Schools
Modular Schools
Interior Applications
Interior Applications

Check out Magboard used to build a Tiny Home!

  • Magnesium oxide boards are the most energy efficient, socially and environmentally responsible building material.
  • It's a breathable material that is not susceptible to moisture and interacts in stable manner with other building materials.
  • It's also highly resistant to fire, insects, fungus, mold, mildew and chemicals.
  • It's a natural product that contains no toxins whatsoever.
why ambient
environmentally friendly home

An Environmentally Friendly Building Material for Building Healthier Homes

Ambient’s MagBoard is a technologically advanced, high performance, fully recyclable board used to replace gypsum drywall, fiber cement wallboards, OSB or plywood. The board’s resistance to mold, mildew, fungus and extreme environmental exposure makes it the perfect building material for health-conscious builders and families.

MagBoard gains its strength and resistance from very strong bonds between magnesium and oxygen atoms that form magnesium oxide crystals (with the chemical formula MgO). MagBoard is a mineral based green building material. MagBoard has high moisture resistance and repels mold, mildew and other fungal health hazards. This also means no warping, swelling, or rot when exposed to water or other elements. Because it is resistant to extreme cold or heat, construction can take place in virtually any environment, at any time, and in any season.

MagBoard Environmental Benefits:

  • MagBoard offers excellent impact strength which increases the lifespan of homes and buildings.
  • Resistance to fire, mold and insects increases the lifespan of homes and buildings.
  • MagBoard is a completely recyclable product classified as ‘Nutritional Waste’.
  • Leftover material can be ground up and sprinkled into the soil to act as a nutrient.
  • MagBoard is not made with any toxic materials and is considered landfill friendly.
  • Magboard uses a low energy manufacturing process.
  • Captures carbon dioxide CO2 during the curing process.
5 year warranty
Buy with confidence
5 years warranty against structural defects
This warranty applies solely to MagBoard sold by Ambient Bamboo Products Inc. This warranty does not cover products that are not purchased directly from Ambient. We guarantee that our MagBoard is free of manufacturing defects and will remain free of said defects during the term of the warranty period when used for the intended purpose.

Frequently Asked Questions

MagBoard is a strong, high quality, fire-proof, mineral-based building material used to replace plywood, fiber cement panels, OSB and gypsum wallboards. It is an extremely versatile product for use with interior and exterior construction. It is mading from bonding certain elements (including magnesium and oxygen) which results in an extremely strong cement-like material. Similar compounds have been used for construction purposes for hundreds of years in such world-famous sites such as the Great Wall of China, Rome's Pantheon, and extensively throughout one of the world's tallest buildings, Taipei 101.

Expensive deposits of magnesium oxide can be found in China, Europe, and Canada. The great White Mountains in China have so much natural MgO, it is estimated there is enough to last another 800 years at today's rate of consumption. Magboard is an incredible building material with seemingly unlimited uses. It can be used in place of drywall, and some of the many applications include sub-flooring and tile backer, ceilings, walls, exteriors, soffits, sheathing, coding substrates, shaft-liner, bathtub enclosures, and exterior siding. When used for exterior projects it must be coated or protected from the elements.

MgO board is harder and stronger than drywall, and it is resistant to fire, insects, mold, mildew, and rot. It is sound and impact resistant, and has good insulating characteristics. It's noncombustible and non-toxic, has a receptive bonding surface, and contains no dangerous toxins like some other building materials. One exciting characteristic about Magnesium board is that it's lightweight while still being very, very strong. Therefore, a smaller amount of MgO board can do the same job (or better) as a greater amount of another material, such as sheetrock. And don't forget, because MgO board is so moisture-resistant, it lasts a very long time. The Great Wall of China is a perfect example of that!

Magboard can be sawed, drilled, router-shaped, scored and snapped, nailed, and painted. It's many uses in the construction field include fireproof materials for ceilings and walls in every type of construction including apartment complexes, theaters, airports, hospitals, and much more.

This amazingly versatile product also happens to be very green (environmentally friendly – not the color green). It has no ammonia, formaldehyde, benzene, silica, or asbestos, and it is completely safe for humans. It's a natural product that can be completely recycled, so it leaves a very small carbon footprint, and has no negative impact on landfills.

Magboard is available in a variety of sizes and thicknesses, it comes in a choice of basic colors and textures, and there are different grades and strengths to choose from, depending on the application. Because it is so hard, there is no need to place joints on a stud. And because it is so stiff, thin boards can be used in place of thicker boards of another material.

MagBoard is a unique, cost-effective building material available across the U.S. The product has been engineered to resolve some of the toughest building challenges faced by architects, contractors, installers, builders and consumers. These include resistance to fire, moisture, mold, mildew, fungus and insects.

MagBoard is an extremely versatile product and can be used in many applications both interior and exterior.

Exterior Applications:
  • Wall sheathing
  • Fascia
  • Soffit
  • Trim
  • Lap Siding
Interior Applications:
  • Wall panels
  • Ceiling board
  • Tile backer
  • Drop ceiling tiles
  • Fire wall system
Specialty Applications:
  • Office cubicles
  • Room dividers
  • Structural Insulated Panels (SIPS)

MagBoard MgO Panels are sold in standard 4 × 8 ft sheets and in multiple thickness from 6mm to 20mm.

Yes. MagBoard is safer than many comparable building products. It is a mineral based product made with non-toxic ingredients. It is completely recyclable and resistant to mold, mildew, fungus and allergens. It is ideal for people who suffer from allergies or asthma. It is also free of carcinogens and silicas.

Purchase MagBoard directly through Ambient Building Products. We ship directly to your home or business. Read our shipping policy here.

MagBoard offers many cost benefits. Because of its strength and durability MagBoard increases the lifespan of structures such as homes and buildings. The cost per sheet of MagBoard MgO Panels for the same thickness is greater than regular gypsum but the same or less than specialty types and generally less than most cement products.

With MagBoard you pay a small premium for a huge increase in versatility and applications of MagBoard. Additional cost savings are found in the installation of MagBoard because the time to finish the boards can be much less and less product is needed in many applications. In addition, MagBoard MgO Panels are strong enough to support light shelving, pictures, etc., meaning no need to pre-install backing supports or use more expensive anchors. MagBoard MgO Panels are completely recyclable can also be disposed of easily. There are no expensive fees such as with the recycling/disposing of gypsum board scraps. Use leftover MagBoard for a variety of indoor and outdoor projects, such as edging the landscaping, installing shelving, or excess material can be ground up and added to the soil as a nutrient.

When comparing building material costs consider the benefits and features offered by each product. This includes the upfront costs but also the savings recognized during the life of the product. MagBoard MgO Panels provide a cheaper lifetime cost and a similar installation cost to gypsum when all the expenses are considered.

Cost benefits of MagBoard
  • Faster installation, using a “tile” approach to joint finishing boards allow the boards to be painted the same or next day.
  • No corner beads are required leading to a significant savings compared to gypsum installation.
  • No backing materials are required for shelving, cabinets, grab bars, etc.
  • Virtually expense free disposal with no dedicated waste removal needed.
  • Thinner boards can be used - 12mm for walls and 6mm for ceilings thereby reducing costs.
  • Expansive resistance adds stiffness to walls and will perhaps reduce bracing or the need for interior plywood shear panels that are necessary with traditional construction.
  • MagBoard panels are resistant to moisture, fire, mold, termite, impact, and freeze/thaw.

The possibility of expansion for MagBoard is low however there is some hydrothermal movement. You can leave smaller gaps to accommodate for lower expansion or shrinking. MagBoard is highly resistant to extreme outdoor environmental exposure such as rain and strong winds as long as it is properly coated.

No. MagBoard is considered mmoisture resistant, however during periods of extended exposure, moisture can affect it and it will experience hydrothermal expansion. When used outdoors, Magboard should be covered or coated to protect it from the elements.

It is made by combining the carbon out of magnesium carbonite; commonly called “MgO” due to its chemical composition of magnesium (chemical symbol Mg) and oxygen (chemical symbol O). When oxygen is combined with magnesium under heat and pressure, it can produce a stone-like material: MgO. It is ground up into a powder, which is then combined with water to make a cement-like (adhesive) material. MagBoard also contains other components but MgO is the primary component.

Pure magnesium, in its raw form, burns. MgO, however, is completely nonflammable and is used for fireproofing.

The chloride content of our magboard is regulated during our manufacturing process and our boards average approximately 8%. Additionally, our dissolvable (free) chloride ion content is less than 5% and our sulfate content averages 0.2%.

MagBoard MgO Panels are made from natural minerals, Magnesium oxide, Chloride, and Sulphate otherwise known as Epsom salts, along with wood dust (cellulose) perlite or vermiculite and a glass fiber mesh. There are no volatile organic compounds or toxic ingredients. Caution: while the materials used are not harmful, it is strongly recommended everyone wear proper silica/concrete dust respirators when using MagBoard due to the dust created while cutting and sanding.

MagBoard can be stored easily indoors. It is highly resistant to moisture, and humidity making it easy to store. MagBoard should be stored inside in a cool dry place as with any sheet building material. To protect the edges and corners, carry boards on their side. Stack boards flat on dunnage, loose wood, matting or other material and not directly on the ground. Do not allow MagBoard to bow. Do not stack any other materials on top of MagBoard. Before installing MagBoard acclimate the panels for 48 hours in the room where they will be installed.

Finish MagBoard with most products such as paint, stucco, synthetic stucco, wallpaper, plaster, stone, tile, brick and much more. The strong adhesion properties of MagBoard also make it a perfect product for Structural Insulated Panels (SIPS), Exterior Insulated Finish Systems (EIFS) and interior wall systems using fabrics.

To finish MagBoard MgO Panels after installation, begin with a primer. This is required because MagBoard panels are alkaline in nature. We recommend using a primer that is suitable for concrete or masonry. There are a few popular brands of paint which react molecularly with the cement in MagBoard forming a UV highly resistant coating that will last for years. Acrylic stucco topcoats or polymer modified cement base coats can also be used and individually applied to the board. Test the topcoats and paints prior to completing the entire project. To properly test the bonding capability of the topcoat, brush on or spray a small area of the MagBoard with paint, let the board dry and cure. Then make an X with a sharp razor knife, apply masking tape over the cut and press firmly and rip it off like a band-aid. If the paint stays on the board, this indicates the paint and board have a successful bond.

When installing panels, leave a 3 to 6mm wide gap between the panels. Control the depth of the gap using polyethylene backer rods to the point where the width is greater than the joint depth. Use non shrinking paintable caulk applied with a caulk gun, then smooth off excess caulk using a little water and your finger or a caulk smoothing tool. Add a coat of primer when the caulk is cured. After priming, apply a thin coat of spackle or gypsum mud to remove any joint telegraphing. The outside corners of the boards can be glued, sanded or routed smooth and flush and filled with caulk, plaster or grout. Use glue on the inside corners of the boards or butt joint with a bead of painter’s caulk.

The outside corners of the joints can be butted together and then sanded smooth. For a bull nose finish, corners can be routed or mitered. Adding a corner bead of caulk is optional. MgO bonds well to itself, metal, wood and other materials. Apply adhesive to the corner board joints using using ChemLink M1 or a moisture cure urethane adhesive. Review the caulking chart for other tested products.

Ceilings: For ceilings where the board will be fastened by screw to light gauge steel or wood use 8mm or thicker. Use a thicker board if planning to countersink the screw head. For drop down ceilings using MgO as panels, use 2mm or 6mm.

Walls: For most walls a board that is 10mm to 12mm is common. For walls requiring greater fire and impact resistance use a board that is 15mm to 20mm thick.

For walls that have continuous backing, cement or rigid insulation, a thinner board can be used. This is important when weight is a concern. For example, trailer homes have used 6mm as fully supported wall covering boards.

For applications where more strength is needed such as sports courts, or where sound reduction is needed, or for use to support bar countertops, use a thicker board at 20mm.

A few things can cause micro cracking in magnesium oxide boards such as structure movement caused by force from wind or earthquake. Or the structure may expand caused by thermo graphic or hydrometric expansion. The frame used under the boards may change as wood will shrink when dried and metal expands when heated. MagBoards shrink during curing and drying to ambient humidity and will have some movement due to thermal or moisture changes. Micro cracking becomes a negligible issue because most interiors maintain relatively even temperatures.

To address and or prevent micro cracking follow a few precautionary steps. First, before installation, allow the boards to acclimatize in the structure where they will be used. Leave a small space between boards and apply a non-shrinking caulking followed by a primer coat of paint. Apply spackle or plaster to hide any imperfections. Finish by using a paint designed to prevent moisture absorption. Isolate joints from the structure by splicing with strips of scrap MgO Board or metal clips to keep the joints between studs.

To fasten MagBoard panels, use corrosion resistant fasteners. Add extra support by applying a barrier coat of epoxy, ceramic or a similar adhesive. Drywall screws that have a stainless steel or phosphoric coating also work well with MagBoard panels. For easiest installation, choose screws with self-counter boring heads. Alternatively, use gun nails when applying to both wood and light gauge steel framing with the appropriate pins or nails.

To finish MagBoard joints, use any top-quality joint compound. Check with the manufacturer of the product to ensure it is compatible with MagBoard. Use finely ground hydraulic cement fillers such as RapidSet One Pass to establish industrial strength joints. Additionally, urethanes bond well to MagBoard panels. If using tape and mud is a preference, choose a self-adhesive fiberglass tape and a mud or plaster suitable for moist environments. Most lightweight pre-mixed mud does not like moisture and MagBoard MgO Panels can have moisture, but they will eventually equalize with the structure.

MagBoard MgO Panels bond well to itself, metal, expanded polystyrene, wood, and laminates using ChemLink M1 or another moisture cured urethane adhesive.

The density of MagBoard is around 1 gram per cubic centimeter or just over 2.2 pounds per square foot for 12mm (1/2 inch) board – They are typically heavier than gypsum and lighter than ordinary cement boards.

For optimal results cutting MagBoard panels, use a thin carbide circular saw or worm drive saw. Rout the edges using carbide tooling. If the construction project is a large project, consider using a diamond bit. MagBoard panels can be scored with a razor blade and snapped apart from the smooth side. This method does not provide as clean an edge and will require more finishing work. To prevent micro cracking with cuts, glue all corners together.

MagBoard MgO Panels are ideal for use as a sub floor. Additionally, boards are available in the correct thickness and strength for use as structural sheathing. To determine the proper board grade depends on the design of the floor, joist span, spacing and size, dead load and live loading factors.

Installation Instructions and Handling Guidelines

For successful installation of MagBoard, follow the instructions and guidelines listed here

Storage and Handling

Although MagBoard is heat and moisture resistant, it should be stored inside in a cool dry place as with any sheet building material. To protect the edges and corners, carry boards on their side. Stack boards flat on dunnage, loose wood, matting or other material and not directly on the ground. Do not allow MagBoard to bow. Do not stack any other materials on top of MagBoard.

Tools and Materials Required

MagBoard is a multipurpose board used inside for walls, floor, ceiling, tile backer board and also outside for sheathing, roof decking and lap siding. Depending on how the board is used and the thickness of the board being used, will dictate what tools may be needed.

  • Safety Glasses
  • Dust Mask
  • Gloves
  • Putty Knife
  • Saw Horses
  • Square
  • Carbide Tipped Scoring Knife or Utility Knife
  • Fiber Cement Shears
  • Dust Reducing Circular Saw
  • Polyurea or Modified Epoxy Seam Filler
  • Underlayment
  • Fasteners (Recommended fasteners vary by application, see fasteners below)
  • Adhesive – (Depending on application - ASTM D3498 compliant adhesive, Select Construction Adhesive


Remove the packaging and allow the MagBoard panels to acclimate to the room temperature and humidity for 48 hours. Ideally, the boards should acclimate in the room where they will be used with the temperature replicating the planned temperature of the room.


Placement varies depending on the application of the boards. When attaching to cold-formed steel framing (CFS), stagger panels with a 1/16” (1/5mm) gap between boards. When attaching to wood allow 1/8” gap.

Board Orientation

MagBoard is constructed with one side smooth finish and one side rough finish. The rough finish can be used as a backer board for tile and other applications.

Filling Seams

When laying resilient flooring such as Luxury Vinyl Plank, Bamboo Flooring, Eucalyptus Flooring, Vinyl plank or Linoleum over MagBoard, fill with a polyurea or modified epoxy seam filler and shave or sand until flush. This helps create a smooth surface and avoids “telegraphing” which is uneven joints to on the wear surface.

Installation (Flooring, Wall and Ceiling)

  • Installation must comply with all applicable local, state and federal codes and should also follow industry installation practices.
  • Cut MagBoard with a carbide tipped scoring knife or a power saw equipped with a carbide blade. Do not use power saws indoors. For best results, use a blade designed specifically for cement board and use a T-square to help ensure cuts are straight and even.
  • For circular cuts and irregular angle cuts use a Roto Zip, Dremel, or equivalent tool, equipped with a cement board bit or carbide tipped bit.
  • Start with proper framing and ensure studs are straight and square to allow for adequate fastening surface at adjoining walls and flat stress-free installation of MagBoard. Ensure framing is level.
  • The fewer cuts that are made the better and easier installation will be. Begin by laying out your floor before fastening to the joists. When planning the layout make sure the cut edges will be against the perimeter of the room. Sheets should be spaced evenly and butt tightly.
  • Install MagBoard on 16” centers. Always support board ends by joists. Slightly countersink each fastener. Leave about 1/8th inch between the perimeter walls and the MagBoard to allow for expansion.
  • After installing the initial sheet of MagBoard flooring, apply a generous amount of Select Construction Adhesive, or equal, to the exposed edge of the installed sheet of MagBoard. Install the next sheet of flooring butting joints together tightly. Squeeze a small amount of well-bonding construction adhesive the surface along the entire seam. Use a putty knife to remove excess from the butt joint. After installation of first board, verify the board is level before continuing.


Magnesium Oxide Boards (MgO) are a non-tox board material and certain types of fasteners may corrode the board. Because all projects and locations are different, consult a local fastener expert for your location and project. Ambient recommends using a 316-stainless steel material for all fasteners. Alternatively, a ceramic coated fastener designed specifically for cement board products may also be acceptable.

  • Fastening to wood studs with screws: Use #8 flat head fasteners with high / low threads and a sharp drill point.
  • Fastening to metal: Use 18 gauge or heavier, with screw: Use #8 flat head screw with nibs under the head for countersinking into the MagBoard, and a self-drilling point for penetrating the light gauge metal. When fastening to light gauge materials lighter than 18 gauge, consider using pneumatic fastening. Other fasteners may strip out lighter gauge studding prior to countersinking the head of the fastener into the MagBoard sheathing. If fastening using pneumatic nails use hardened nails. Pneumatic pressures vary depending on board thickness and stud material used. Always set pressure based on countersinking needs.
  • Fastener Installation: Install fasteners no closer than 4” from corners. Perimeter fasteners should be placed 6” apart. Center fasteners should be placed 12” apart. Install fasteners approximately 9/16” from board edge. Do not install fasteners at 45º angles. Always begin fastening at one side and proceed to fasten across the board to the other side to avoid stress.


MagBoard does not contain any carcinogenic material. We do recommend that installers wear a dust mask and safety glasses during routing, cutting and sanding operations. Never dry sweep MagBoard, instead use a wet suppression or HEPA vacuum.

If you are using galvanized steel framing, the chlorides in some MgO sheathing, used to ward off insects and prevent the feeding of mold and mildew, may experience a reaction. There have been no reports of such reactions. If using MagBoard as a sheathing, we recommend installing a barrier of some type to eliminate direct contact between the board and the framing.

Be sure to always follow local, state and national building codes with your construction projects.

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