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TechBoard® T&G
MgO Tongue-and-Groove Subfloor Panel
The same climate-resilient MgO technology as TechBoard®, manufactured in a thicker 3/4" panel with interlocking edges for a faster, tighter subfloor installation. TechBoard® Tongue & Groove brings fire, moisture, mold and pest resistance to floor assemblies in a familiar panel format.
How It’s Used
Wood-Framed Subfloors
Install over wood floor framing to create a stable MgO base with interlocking edges that help maintain consistent joints and minimize panel movement.
Light-Gauge Steel Subfloors
Install over compatible light-gauge steel framing where the floor design calls for a moisture-resistant, noncombustible alternative to wood-based panels.
Base for Finished Flooring
Create a flat, durable substrate beneath compatible flooring finishes, including tile, hardwood, luxury vinyl plank and carpet.
Suitability, framing spacing, fastening and finished flooring requirements must be confirmed through project specifications, applicable technical documentation and local code requirements.
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TechBoard® Tongue and Groove Specifications
TechBoard® T&G is available across Canada and the United States as a standard 3/4" magnesium cement panel for subfloor applications.
One Standard Panel. A Better-Connected Floor.
Thickness
Available Size
Typical Applications
3/4" (19 mm)
4' × 8'
Subfloor applications over compatible wood or light-gauge steel framing
One Material. Multiple Advantages.
A sheathing panel is only as good as the material it's made from. At ZS2, we've spent years advancing magnesium cement technology through continuous formulation, manufacturing, and testing. Every improvement in the material is reflected in how the panel performs, from fire and moisture resistance to durability and long-term resilience. Because when the chemistry is right, everything built on top of it performs better.
Naturally Fire Resistant
- Won’t contribute fuel in a fire, helping limit flame spread and improve building resilience.
- When exposed to extreme heat, chemically bound water is released as steam rather than smoke, helping dissipate heat during a fire event.
- Non-combustible by nature, without relying on added fire-retardant treatments or coatings.
Built for the Elements
- Won’t rot, swell, or delaminate like gypsum or wood-based building materials when exposed to moisture.
- Naturally resistant to mold and mildew because it doesn’t provide an organic food source for growth.
- Maintains strength and dimensional stability through changing climates, freeze-thaw cycles, and demanding jobsite conditions.
More Performance with Fewer Layers
- Combines multiple wall assembly functions into a single high-performance MgO board
- Ships flat-packed and installs using familiar framing methods, tools, and fasteners.
- Helps simplify specification, reduce trade coordination, and improve construction efficiency from design through installation.
Built for Decades
- Engineered for long-term durability with reduced maintenance and replacement over the life of the building.
- Supports resilient, lower-carbon construction without compromising performance.
- Helps owners, designers, and builders meet evolving expectations around lifecycle performance, resilience, and insurance risk.
Performs Where Gypsum Rots, OSB Burns, and Concrete Cracks.
MgO delivers the fire resistance, moisture durability, and long-term performance traditional building materials can't.
Construction Sequence
Step 1 – Prep
Confirm the floor framing is level, properly aligned and designed for the specified assembly. Plan the panel layout, framing spans and joint locations according to project requirements and TechBoard® T&G installation guidance.
Step 2 – Install
Fit the tongue-and-groove edges together to create tight, consistent joints, then fasten each panel to the wood or light-gauge steel framing using the specified fasteners and spacing. Panels can be measured and cut using familiar jobsite tools.
Step 3 – Finish
Check that joints are fully engaged and the completed surface is clean, secure and ready for the next layer. Install compatible membranes, adhesives, underlayments or finished flooring according to project specifications and the flooring manufacturer’s requirements.
Innovation, Built.
Keep scrolling to see the transformation
Real projects. Trusted partners. Proven performance across North America.
From design support and manufacturing to installation and long-term performance, we're invested in every project long before the first panel arrives on site. Explore recent case studies, watch products being installed, or get our report card straight from the source.
TechBoard® Tongue & Groove: MgO Subfloor Installation
CMHC Housing Supply Challenge Project Spotlight: How ZS2 is Scaling What Works
Case Study: Milk Processing Facility
Product Resources & Technical
Documents
TechBoard® T&G FAQ & 1 Pager
- Download
ZS2 TechBoard® - Data Sheet
- Download
ZS2 TechBoard® - Product Sheet
- Download
ZS2 TechBoard® - Installation Guide
- Download
CERus-1009-ZS2-Technologies-Ltd-QAI Laboratories
- Download
Recommended by Others
The 3/4” TechBoard has been a reliable choice for subfloors, providing a solid, level surface that installs quickly and performs well long-term. It minimizes movement and helps ensure a quiet, stable finished floor.
20 years ago I built the house next door and made it energy efficient at the time. My utility bills are on average $100/month on gas and $100/month on electricity. This is the same size house and my energy bills are $30-60/month each. So it’s super energy efficient.
The house is crazy good, warm in freezing weather and unchanged on warm days. Just circulating air and the furnace barely kicks in… So quiet too, can’t hear anything outside, utilities are excellent!
Frequently Asked Questions
TechBoard® T&G can be specified as an alternative to conventional OSB or plywood subfloor panels in compatible floor designs. It offers the added material benefits of magnesium cement, including resistance to fire, moisture, mold and pests. Suitability must be confirmed for the complete floor assembly, including framing spans, design loads, fastening and finished flooring requirements.
Magnesium cement will not rot, swell or delaminate like wood-based panels when exposed to moisture. This helps reduce the risk of uneven panels and damaged joints during construction or in moisture-prone environments. TechBoard® T&G is not a waterproofing layer, so required moisture protection, membranes and proper jobsite practices must still follow the floor design and local code requirements.
TechBoard® T&G can provide a durable base beneath compatible finishes such as tile, hardwood, luxury vinyl plank and carpet. Some finishes may require an additional membrane, adhesive, underlayment or surface preparation. Always confirm compatibility and installation requirements with the flooring manufacturer and project design team.
The magnesium cement panel will not ignite or contribute fuel to a fire. When exposed to extreme heat, chemically bound water within the material is released as steam rather than smoke. Fire-resistance ratings apply to tested complete assemblies, not the board alone, so the framing, fasteners, floor finish and other assembly components must be evaluated together.
TechBoard® T&G is available across North America in a standard 3/4" panel format. Contact ZS2 with your project location, floor design and required quantity to confirm suitability, availability and technical requirements.
Built to Support Every Project.
From your first specification to the final installation, our team is here to make building with magnesium cement as straightforward as building with the materials you already know.
Find the Right Solution for Your Build
From standard MgO boards to project-specific prefabricated assemblies, see how each ZS2 product is specified, supplied and installed.
How you specify it
How it is supplied
How it is used
TechBoard®
Sheathing, backing board & underlayment
Select the required board size and thickness for the application.
Standard-format boards, ordered by sheet or project quantity.
Install in wall, ceiling and floor assemblies using familiar tools, fasteners and construction methods.
TechBoard® T&G
Tongue & groove subfloor panel
Specify the standard T&G panel and approved floor assembly.
Standard-format boards, ordered by sheet or project quantity.
Interlocking panels install over wood or steel framing to create a continuous structural floor deck.
TechPanel®
Prefabricated structural walls, floors and roofs
Provide your designs, structural requirements and target R-value.
Custom panels manufactured from your approved designs.
Numbered panels arrive ready for sequenced installation for building envelope.
TechClad™
Continuous Exterior Insulation Panel
Select a standard size, or specify custom dimensions and target R-value.
Standard sized panels or manufactured to project specifications.
Installs over existing or conventional framing to create a continuous exterior insulation layer.