MgO board installation on a joist structure is a proven, high-performance method for building strong, stable, and long-lasting sub-flooring systems. In both residential and commercial construction, magnesium oxide (MgO) boards are rapidly replacing traditional plywood and cement boards thanks to their fire resistance, moisture tolerance, and environmental sustainability.
This comprehensive guide walks you through how to install magnesium oxide board for sub-flooring over joists, with step-by-step instructions designed for professionals and DIY builders alike. Whether you’re building from scratch or renovating an existing floor, proper MgO board installation ensures a safe, level, and highly durable foundation that supports a variety of surface finishes. From materials preparation and joist layout to fastening techniques and final surface treatment, every stage is covered to help you achieve optimal results.
1. Preparation
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Materials and Tools
Gather the necessary materials, including MgO boards, wooden or metal joists, screws, expansion bolts, a level, moisture barrier (optional), and installation tools such as a drill, hammer, etc.
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Surface Cleaning
Before installation, ensure that the floor surface is clean and level. Remove any debris and make sure the surface is smooth. If the surface is damp, it’s advisable to lay down a moisture barrier to improve the floor’s resistance to moisture.
2. Installing the Joists
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Determine Joist Layout
Plan the joist layout based on the floor dimensions. Typically, the joist spacing should be between 40-60 cm (16-24 inches). Use a level to ensure the joists are installed evenly, which is crucial for a level floor. The choice between wooden or metal joists should be based on the environmental conditions and load requirements.
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Securing the Joists
Place the joists in their designated positions and use expansion bolts to secure them to the floor. Ensure that all joists are at the same height to avoid uneven flooring. If using wooden joists, consider applying a protective coating on the areas in contact with the floor to extend their lifespan.
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Reinforcing the Joists
Install cross-bracing between the main joists to further stabilize the structure. These cross braces should be placed perpendicular to the main joists, with spacing that matches the MgO board dimensions. This ensures that the edges of the boards are fully supported.
3. Laying the MgO Boards
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Cutting the Boards
Measure and cut the MgO boards to fit the floor layout and joist spacing. Ensure the edges of the boards are cut cleanly to allow for tight seams and secure installation.
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Securing the Boards
Place the cut MgO boards onto the joists and secure them with specialized screws. The screws should be spaced 20-30 cm (8-12 inches) apart, with even distribution along the edges and across the center of the boards. Make sure the screws are flush with the surface of the board to avoid any protrusions.
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Handling Expansion Gaps
Leave a small expansion gap (typically 3-5 mm) between the boards to accommodate potential expansion and contraction due to changes in temperature and humidity. Fill these gaps with sealant or caulk to prevent dust and moisture from penetrating.
4. Surface Finishing
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Leveling Check
Once the boards are installed, use a level to check the evenness of the floor. Adjust as necessary to ensure there are no noticeable high or low spots.
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Installing the Top Layer
Depending on your requirements, you can add a decorative top layer such as vinyl flooring, tiles, or hardwood on top of the MgO boards. This layer not only enhances the aesthetic appeal of the floor but also adds an additional protective layer, prolonging the floor’s lifespan.
5. Conclusion
Successful MgO board installation using a joist structure offers more than just foundational support—it delivers enhanced performance, extended lifespan, and peace of mind. By following the correct procedure—ensuring accurate measurements, proper joist spacing, secure fastening, and clean expansion gaps—you’ll be laying a floor system that can withstand moisture, fire, and daily wear for many years.
Whether you are working on a new construction project or upgrading an older subfloor, mastering how to install magnesium oxide board gives you a long-term edge in terms of structural integrity and building safety.
Need assistance or product recommendations for your next MgO board installation project? Contact Suparna MgO Board today — our experienced team is here to provide detailed specifications, expert guidance, and reliable supply for high-quality magnesium oxide boards tailored to your flooring needs.
