Mgo board flat roofing sheet

 In a flat roofing system, MgO (Magnesium Oxide) boards act as a high-performance structural substrate or cover board. They are increasingly replacing traditional OSB (Oriented Strand Board), plywood, or gypsum-based boards due to their superior fire rating and moisture resistance.

Here is the technical breakdown of using MgO boards for flat roofing：

1. The Core Functional Role

In a flat roof assembly, the MgO board is typically installed over the metal or wood framing to provide a solid, flat surface for the waterproof membrane.

• A1 Fire Rating: Essential for commercial projects with strict fire codes. It acts as a fire barrier between the building interior and the external roofing membrane.
• Compression Strength: It provides a rigid base that protects the insulation layer from being crushed by foot traffic during maintenance.
• Dimensional Stability: Unlike wood-based sheets, MgO boards exhibit minimal expansion or contraction (low linear thermal expansion), which prevents the waterproof membrane from tearing at the joints.

2. Critical Specification: Sulfate-based vs. Chloride-based

For flat roofing, Sulfate-bonded MgO boards (Magnesium Sulfate) are the industry standard for high-end or industrial projects.

• The Corrosion Risk: Standard "Chloride" MgO boards can "sweat" (release salty moisture) in high-humidity roof cavities. This moisture is highly corrosive to the metal screws (fasteners), steel joists, and aluminized steel frames typically found in flat roof assemblies.
• The Sulfate Advantage: Sulfate boards are "chloride-free," meaning they will not cause the fasteners to rust or the structural steel to corrode over time.

3. Common Technical Specifications

Feature	Typical Requirement for Flat Roofs
Common Thickness	12mm, 15mm, or 18mm (depending on span and load)
Edge Profile	Square Edge (for standard layouts) or Tongue & Groove (T&G) (to prevent vertical displacement between boards)
Density	High Density (> 1,000 kg/m³) is preferred for structural strength
Flexural Strength	Must meet local building codes for roof loading (wind uplift and live load)

 

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220

Mgo board outdoor application

 Magnesium Oxide (MgO) board is highly effective for outdoor applications, provided it is used correctly—primarily as a substrate rather than a finished exterior surface. While it is naturally moisture-resistant and non-combustible, it is not "waterproof" in the sense of being a final weather barrier.

 Primary Outdoor Uses

• Wall Sheathing: As a direct replacement for plywood or OSB, providing superior fire resistance and mold protection.
• Soffits and Fascia: Excellent for these areas due to its resistance to rot and high humidity.
• Roof Decking: Used as a fire-rated base layer under roofing materials.

Choosing the Right Board

• Sulfate vs. Chloride: For outdoor use, Magnesium Sulfate (MgSO₄) boards are generally preferred. They are significantly less prone to "sweating" (leaching salt/moisture) and are less corrosive to metal fasteners than standard Chloride-based boards.
• Density: Ensure you are using a high-density "Exterior Grade" board, which typically has lower water absorption rates.

Pros & Cons for Exterior Use

Feature	Benefit for Outdoors
Fire Rating	Class A1 Non-combustible; ideal for wildfire-prone areas.
Mold/Pests	Inorganic and high pH; will not support mold or attract termites.
Dimensional Stability	Does not warp or swell like wood-based products when damp.
Freeze-Thaw	Performs well in extreme temperature shifts without cracking.

More information, please visit at www.hocre-board.com or send message by whatsApp +86 15001321220

What is Fiber Cement Flat Roofing?

 Fiber cement Board  is a composite material made of Portland cement, cellulose fibers, and mineral fillers. When manufactured as a flat roofing sheet, it undergoes a high-pressure steaming process (autoclaving) that results in a material with remarkable dimensional stability and strength.

1. Unmatched Fire Safety (A1 Fire Rated)

For high-rise developments and industrial hubs, fire compliance is non-negotiable. Most premium fiber cement sheets are A1 or A2-s1, d0 non-combustible, providing an essential safety barrier that traditional bitumen or plastic-based roofing cannot match.

2. Superior Moisture and Corrosion Resistance

Unlike metal roofing, fiber cement does not rust or corrode in coastal or high-humidity environments. Furthermore, high-quality boards are engineered to prevent "sweating" or leaching, ensuring the sub-assembly remains dry and mold-free.

3. Low Thermal Expansion

One of the biggest challenges in roofing is the expansion and contraction caused by temperature swings. Fiber cement flat sheets have a very low coefficient of thermal expansion, which reduces the stress on screws, anchors, and frame systems.

Technical Data Sheet (TDS):

Density: ≥1.2g/cm3 for high-impact resistance.

• Modulus of Rupture (MOR): Class 4 or 5 according to EN 12467 standards.
• Water Impermeability: No water drops on the reverse side after 24 hours.
• Surface Finish: Options include through-colored, UV-resistant coatings, or natural grey for industrial aesthetics.

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220

fibre cement lap cladding

 Fiber cement lap cladding is a highly durable exterior siding material made from a mixture of cellulose fibers, portland cement, sand, and water. It is designed to mimic the appearance of traditional wood siding—specifically "lap" or "clapboard" styles where each board overlaps the one below it—while offering significantly higher resistance to environmental factors.

Key Performance Benefits

• Fire Resistance: Most fiber cement products are non-combustible (often rated Class A or A1), making them ideal for high-risk wildfire zones or commercial applications.
• Moisture & Rot Resistance: Unlike wood, fiber cement does not rot, swell, or buckle when exposed to rain or humidity. It is also resistant to termites and other wood-boring insects.
• Dimensional Stability: It has a low thermal expansion coefficient, meaning it won't shrink or expand drastically with temperature changes, which helps maintain the integrity of paint and seals.
• UV Resistance: When factory-finished or treated with high-quality coatings, it holds color much longer than traditional timber siding.

Common Specifications

Feature	Typical Standards
Thickness	8mm to 12mm (5/16" to 1/2")
Standard Widths	150mm to 300mm (approx. 6" to 12")
Surface Finish	Smooth (modern) or Cedar/Woodgrain (traditional)
Installation	Blind nailed (fasteners hidden) or Face nailed

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220

Grooved Weatherboard • Interior-Exterior fiber cement sheeting

 Fiber cement grooved weatherboards are a versatile cladding solution, designed to mimic the aesthetic of traditional timber tongue-and-groove planks while providing the durability of masonry. Because they are composed of pressurized sand, cement, and cellulose fibers, they offer significant performance advantages in both internal and external environments.

Technical Performance

• Fire Resistance: Typically classified as non-combustible (often reaching A1 or Group 1 ratings), making them ideal for high-risk bushfire zones or commercial interiors requiring strict fire compliance.
• Moisture Stability: Unlike wood, fiber cement does not swell, rot, or warp when exposed to moisture. In exterior applications, this prevents paint from peeling prematurely; in interiors, it handles high-humidity areas like laundries or mudrooms effectively.
• Thermal & Acoustic Mass: The density of the sheeting provides better sound insulation and thermal inertia compared to thin PVC or metal siding.

Application Versatility

Application	Usage Benefits
Exterior Facades	Used for full wraps or accent walls. The deep grooves create strong shadow lines that define the architectural profile of a building.
Interior Walls	Often used for "shiplap" styles or wainscoting. It is much more impact-resistant than standard gypsum drywall, making it suitable for high-traffic hallways.
Soffits & Ceilings	Provides a clean, linear look for porch ceilings or undercover outdoor areas where durability against wind-driven rain is required.

 More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220

Why 19mm MgO Board for Passive Fire Protection?

 

1. Zero Flame Spread & Low Smoke

MgO boards do not burn. In the event of a fire, they do not contribute fuel to the flames and, crucially, do not emit toxic smoke or "dripping" particulates, which are the primary causes of injury during building evacuations.

2. Structural Integrity Under Heat

Unlike plywood or OSB, which lose structural capacity quickly when charred, MgO maintains its shape and load-bearing properties for a longer duration under high temperatures. This is vital for maintaining "compartmentation" in multi-story buildings.

3. Resistance to "Sweating" (Sulfate vs. Chloride)

For 19mm flooring, it is recommended to use Magnesium Sulfate (MgSO4) based boards.

• Chloride-free: Prevents the "crying board" phenomenon where moisture leaches out and corrodes metal joists or fasteners.
• Stability: Sulfate boards offer better dimensional stability in changing humidity, ensuring the T&G joints stay tight.

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220

PASSIVE FIRE FLOOR CLADDING Magnesium Oxide (MgO) boards with a Tongue & Groove (T&G)

 Magnesium Oxide (MgO) boards with a Tongue & Groove (T&G) profile are increasingly used as high-performance subflooring and underlayment. They offer a robust alternative to plywood or fiber cement, particularly in environments requiring high fire ratings and moisture resistance.

Core Technical Specifications

MgO flooring boards are typically denser and thicker than standard wall panels to handle structural loads.

• Fire Rating: Most T&G MgO boards are Class A1 (Non-combustible). They do not contribute to fire spread and release no toxic smoke.
• Standard Thickness: Usually ranges from 18mm to 20mm for structural flooring, though thinner boards exist for underlayment.
• Edge Profile: The T&G system allows for a seamless, interlocking fit that distributes weight across the joints and prevents "stepping" between panels.
• Density: Generally between 1,000 kg/m³ and 1,200 kg/m³ to ensure flexural strength and impact resistance.

More information, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220