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SULFROCK SOLUTIONS

MgS BOARD SUBFLOOR

Non-Combustible • High Flexural Strength • High Modulus of Elasticity

Our non-combustible MgS subfloor boards provide a high-performance, single-layer alternative to fibre cement boards, plywood, OSB, and gypcrete underlayments. Designed for strength and stability, these boards can be fixed directly to timber or steel joists using corrosion-resistant screws or standard framing nails.

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  • DESCRIPTION

    Strong, durable, single-layer subfloor solution

  • APPLICATIONS

    Subflooring / single-layer structural floor boards

  • REPLACES

    Gypsum, fibre board, OSB, plywood, and other single-layer structural floor boards

KEY ADVANTAGES

  • Installation Ready:
    Streamlines the build process.

  • Single-Layer Efficiency:
    Reduces materials and labour.

  • Edge Options Available:
    Square, T&G, or shiplap profiles.

  • Superior Strength:
    Engineered for long-term durability.

  • Single-Trade Install:
    No specialist installation sequence required.

PHYSICAL SPECIFICATIONS

  • Thickness:
    16–22 mm

  • Sizes:
    600 × 2440 mm, 900 × 2440 mm, 1220 × 2440 mm

  • Surface:
    Standard or sanded

  • Edge Profiles:
    Square / Tongue & Groove / Shiplap

  • Fire Rating:
    A1

  • Moisture Movement:
    0.1–0.12%

  • Density:
    1150–1250 kg/m³

  • Flexural Strength:
    18–30 MPa

  • Modulus of Elasticity:
    5000–8000 MPa

BENEFITS OF MgS SUBFLOOR BOARDS

Our MgS subfloor boards are engineered to deliver a strong, stable, and moisture-resistant base for a wide range of flooring systems. Whether installing hardwood, tile, vinyl, carpet, or laminate, these boards provide long-lasting structural performance alongside superior resistance to moisture, mould, and fire.

NON-COMBUSTIBLE

A sustainable, non-flammable alternative for both residential and commercial projects. MgS boards resist fire for up to 2–3 hours, remaining stable at 800 °C and non-igniting until 1200 °C.

WATER-RESISTANT

Sulfrock boards retain structural integrity when exposed to moisture, preventing warping, swelling, and delamination.

NON-TOXIC

Free from fly ash, formaldehyde, crystalline silica, and other toxins – providing a safer, cleaner construction environment.

TERMITE-PROOF

Naturally resistant to moisture, fire, mould, and pests; ensuring lasting protection against warping, swelling, or decay.

ENVIRONMENTALLY FRIENDLY

Manufactured from natural compounds, our boards are recyclable and landfill-safe, classified as ‘nutritional waste’. Tested through 36 months of freeze / thaw cycles, they perform reliably all year round.

FUNGUS-RESISTANT

Antimicrobial properties protect against mould, mildew, and rot. Chloride-free formulation prevents corrosion and material expansion.

WHY CHOOSE OUR MgS SUBFLOOR SYSTEM?

  • Residential Flooring: Provides a stable, non-combustible base for timber, laminate, or tile flooring.

  • Commercial Buildings: Offers durability and moisture resistance for high-traffic environments such as hotels, offices, and retail spaces.

  • Industrial Facilities: Ensures fire-safe, moisture-resistant performance for warehouses and manufacturing areas.

  • Bathrooms & Kitchens: Ideal for wet areas, protecting against water ingress and mould growth.

CUSTOM SOLUTIONS

Every project has unique demands — which is why we offer bespoke MgO subfloor options tailored to your specifications:

  • Custom sizes, thicknesses, densities, flexural strengths, and MOE values.

  • Specialised surface treatments for improved moisture resistance.

  • Engineered load-bearing capacities for heavy-duty or industrial applications.