HocreBoard Fiber Cement Products -Company Blog

That is a common and frustrating issue with painting any cementitious surface, including fiber cement board.

The peeling or failure of a sealer (or paint) is almost always due to a lack of proper adhesion, which can be traced back to a few key culprits:

1. Improper Surface Preparation

Fiber cement is a dense, cement-based material, and it ...

Magnesium Oxide (MGO) board is often referred to as a “next-generation” building panel and is an alternative to traditional drywall, cement board, and fiber cement board.

Here is a detailed overview of MGO partition board, including its properties and common uses:

🧱 What is MGO Partition Board?

MGO board is a mineral-based green building material made from a combination of magnesium oxide ...

That’s an excellent question, as the difference between “moisture-resistant” and “waterproof” is critical when choosing building materials like fiber cement board.

Here is a breakdown of the key differences:

 Moisture-Resistant Fiber Cement Board

• Definition: The material resists the detrimental effects of moisture and is not easily damaged or broken down by water, even when exposed for some time.
• Performance: It can absorb some water but ...

Fiber cement board, while naturally moisture-resistant, is not inherently waterproof on its own and often requires additional treatment for wet areas or exterior use.

Here are the main ways to waterproof fiber cement board, depending on the application (e.g., shower walls, exterior siding):

1. For Interior Wet Areas (e.g., Showers, Tubs)

This is the most common application where complete waterproofing is critical, usually before ...

The primary risk associated with “free chlorides” in Magnesium Oxide (MgO) boards is accelerated corrosion of metal building components and significant moisture damage to the structure

This risk is almost exclusively tied to older formulations of MgO boards that use magnesium chloride (MgCl2) as the binding agent (known as magnesium oxychloride cement).

Key Risks of Free Chlorides

1. Severe Metal Corrosion

• The Problem: The ...

The “weeping” or “sweating” issue is a significant problem primarily associated with older-style Magnesium Chloride boards, a type of Magnesium Oxide  board.

It is a process where the board draws moisture from the air, causing salty, corrosive liquid droplets to form and leak from its surface.

What Is Weeping or Sweating?

The question has already been answered with sufficient detail ...

No, MgSO4 (sulfate-based) boards and MgCl2 (chloride-based) boards generally have the same high fire rating in their initial, dry state. The difference lies in the long-term stability of that rating in real-world, high-humidity applications.

Both types of boards are built primarily on Magnesium Oxide (MgO) cement, which is inherently non-combustible

1. Core Fire Rating is Identical

In laboratory tests, both MgSo4 and MgCl2 boards typically ...

The question of whether MgSO4 board is a structural sheathing material is complex and depends on the specific product and its code approval, but the general answer is Yes, specific, high-density MgSO4 formulations are engineered and approved for use as structural sheathing

Here is a breakdown:

1. Structural vs. Non-Structural

• Sheathing is a board or panel material covering the outer wall framing ...

Magnesium Sulfate (MgSO4) Board is unequivocally more suitable for high-humidity and exterior applications than Magnesium Chloride (MgCl2) Board.

The reason is the absence of high concentrations of chloride ions in the  (MgSO4) formulation, which eliminates the core problems associated with  (MgSO4)boards in wet environments:

1. Corrosion: (MgSO4) boards are non-corrosive to metal fasteners and steel frames, whereas (MgCl2) boards can leach corrosive chloride-salt ...

An MGO (Magnesium Oxide) board is generally considered a safe and environmentally friendly building material, often marketed as a greener alternative to traditional options like gypsum drywall and cement board.

Here is a detailed breakdown of its safety and environmental attributes, along with a crucial safety consideration：

Safety and Health Profile

MGO boards have several characteristics that make them a safe choice for ...