Foshan Huiju Decoration Material Co. Ltd.
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| ブランド名: | SUNHOUSE |
| モデル番号: | 1220x244m-12mm |
| MOQ: | 800 |
| 支払い条件: | LC、T/T |
Moisture resistant gypsum board, cement board and magnesium oxide board can all appear in bathroom, kitchen, hotel, hospital and modular building specifications. However, they have different compositions, installation methods, moisture limits, finishing requirements and procurement risks. Correct selection should be based on the actual water exposure, tested building system and destination-market requirements rather than one general claim that a board is waterproof, fireproof or suitable for every wet area.
Distinguish normal humidity, occasional splashing, direct spray, standing water and exterior weather exposure.
Confirm whether the board will receive paint, joint compound, ceramic tile, render or another finishing system.
Review fire, acoustic, mold, impact and structural requirements together with moisture resistance.
Match the exact formulation, standard, test report, fasteners and approved application before bulk purchasing.
The three materials should not be viewed as simple quality levels of the same product. Moisture resistant gypsum board is a lightweight interior finishing panel with reduced water absorption. Cement board is a denser cementitious tile-backing substrate designed for demanding wet and dry areas. Magnesium oxide board is a broad family of magnesium-based panels whose performance depends heavily on binder chemistry, reinforcement and manufacturing quality.
A gypsum-core panel with moisture-resistant additives and treated paper, glass mat or another product-specific facing. It is commonly selected for humid interior walls and ceilings where a smooth drywall finish and fast installation are important.
A cementitious board commonly reinforced with mesh or fibers. Products manufactured as cement backer units are designed to remain dimensionally stable and to provide a durable substrate for tile and stone in suitable wet and dry installations.
A general term covering boards made with magnesium-based binders, fillers and reinforcing mesh or fibers. Products may use chloride-based, alternative low-chloride or another chemistry, so performance can vary significantly between manufacturers.
Even a water-durable substrate contains joints, corners, screw penetrations and service openings. A shower, wet room or tiled enclosure may still require a separate waterproofing membrane, reinforced transition details, compatible adhesives and sealed penetrations. The board is one component of the system, not the complete waterproof barrier.
| Comparison Item | Moisture Resistant Gypsum Board | Cement Board | Magnesium Oxide Board |
|---|---|---|---|
| Primary Binder | Gypsum core with moisture-resistant additives. | Portland cement or another cementitious binder with reinforcing fibers or mesh. | Magnesium-based cement using chloride-based, low-chloride or another binder chemistry. |
| Typical Facing | Treated paper, glass mat or product-specific facer. | Reinforcing mesh or fiber integrated with the cementitious panel. | Fiberglass mesh, nonwoven layers or product-specific reinforcement. |
| Water Exposure Position | Humid interiors and limited water exposure, subject to product approval. | Commonly selected for wet and dry tile-backing areas. | Must be confirmed from the exact formulation, testing and approved exposure conditions. |
| Continuous Wetting | Generally not the preferred default material. | More water-durable, but waterproofing may still be required. | Suitability varies. Some magnesium oxychloride products may have poor long-term water resistance. |
| Surface Finish Quality | Provides a smooth drywall surface suitable for high-quality painted finishes. | Normally intended as a tile or coating substrate rather than a conventional Level 4 or Level 5 drywall finish. | Smoothness and joint visibility depend on the board and finishing system. |
| Cutting And Installation | Usually scored, snapped and fixed using standard drywall installation practices. | Often requires carbide tools, shears or power tools depending on product thickness. | Cutting methods vary; dust control and manufacturer instructions should be reviewed. |
| Relative Board Weight | Generally the lightest option for equivalent wall areas. | Generally heavier because of the dense cementitious composition. | Varies widely by density, fillers, thickness and formulation. |
| Fastener Requirements | Drywall screws selected for the framing and approved assembly. | Corrosion-resistant cement-board screws or other system-specific fasteners. | Fastener compatibility is critical, particularly where chloride-containing formulations may be present. |
| Fire Performance | Available in combined fire and moisture resistant versions. | Cementitious composition can provide strong noncombustible-material characteristics. | Often marketed for fire resistance, but the complete tested assembly must still be reviewed. |
| Mold Risk | Specialty products may provide tested mold resistance, but paper and surface contamination still require moisture control. | Cementitious surfaces provide less organic facing material, but dirt and finishes can still support mold. | Depends on facing, fillers, moisture behavior and surface treatments. |
| Movement And Joints | Compatible drywall tape and joint compound are normally used. | Alkali-resistant mesh tape and approved cementitious joint treatment are commonly required. | Joint products and movement details must match the manufacturer's system. |
| Typical Cost Position | Usually provides the lowest installed cost in appropriate humid interior applications. | Higher board and labor cost, but more suitable for demanding tiled wet zones. | Price varies significantly and should include testing, fasteners, coatings and compliance risk. |
| Main Procurement Risk | Being incorrectly promoted as a fully waterproof board. | Being purchased without the correct screws, tape, membrane or movement details. | Unknown chemistry, free chloride, moisture movement and insufficient system documentation. |
Moisture resistant gypsum board is normally the most efficient option for bathroom dry walls, kitchen walls, powder rooms, laundry rooms and ventilated humid ceilings.
Cement board or another specifically approved wet-area substrate is often preferred for shower walls, bathtub surrounds and tiled areas exposed to repeated spray.
Commercial showers, pools, steam rooms, exterior facades and continuously wet areas require specialist systems. MgO products must be accepted only after formulation and durability verification.
| Application | Preferred Starting Option | Reason | Required Verification |
|---|---|---|---|
| Bathroom Dry Wall | Moisture Resistant Gypsum Board | Lightweight, smooth and economical for painted or lightly tiled interior surfaces. | Moisture classification, thickness, ventilation and finishing system. |
| Bathroom Ceiling | Ceiling-Approved MR Gypsum Board | Provides a smooth finish with lower overhead weight. | Sag resistance, framing spacing, board direction and extraction ventilation. |
| Kitchen Wall | Moisture Resistant Gypsum Board | Suitable for humidity and occasional cleaning splashes. | Additional splashback protection behind sinks and cooking equipment. |
| Residential Shower Wall | Cement Board Or Approved Wet-Area Panel | Better suited to repeated direct spray and tile installation. | Waterproof membrane, joints, corners, penetrations and tile-system approval. |
| Bathtub Surround | Cement Board Or Approved MR System | Exposure varies according to bath and shower configuration. | Define the wet zone and verify manufacturer approval. |
| Public Shower Room | Cementitious Specialist Wet-Area System | Frequent use creates high water loads and limited drying time. | Full waterproofing, drainage, movement joints and corrosion-resistant accessories. |
| Bathroom Floor Tile Backing | Cement Board Or Approved Floor Backer | Designed to support tile under floor loads when correctly installed. | Subfloor stiffness, mortar bed, fixing pattern and movement accommodation. |
| Hotel Bathroom Partition | Combined System | Dry faces may use MR gypsum, while shower faces may require cementitious wet-area backing. | Fire, acoustic, moisture and tile-load requirements. |
| Fire Rated Humid Partition | Fire And Moisture Resistant Gypsum Board | Can provide efficient combined performance where listed. | Exact board designation and complete fire rated assembly. |
| Modular Building Interior | Project-Specific Gypsum Or MgO Board | Weight, transport vibration, fire and moisture requirements may influence selection. | Full-scale system tests, joint design, fasteners and transport durability. |
| Exterior Sheathing | Approved Exterior Sheathing Product | Interior MR gypsum and tile backer products should not be assumed suitable. | Weather exposure, water-resistive barrier, cladding and fastening requirements. |
| Exterior Render Substrate | Approved Render Carrier Board | Render places moisture, movement and adhesion demands on the substrate. | Board approval, render manufacturer compatibility, movement joints and weather testing. |
Selecting a more water-durable board does not eliminate the need to manage water at every transition. In tiled wet zones, the substrate, membrane, adhesive and finish must function as one coordinated system.
This diagram shows a general system sequence. Actual membrane position, primer, tape, joint treatment, adhesive, fasteners and curing requirements must follow the approved board and waterproofing manufacturers' instructions.
Cement board generally remains more stable when exposed to moisture than paper-faced gypsum board. However, water can still pass through panel joints, fastener penetrations and the board itself. Where a waterproof enclosure is required, install the specified membrane and transition details.
Gypsum, cementitious and magnesium-based boards are often selected partly for fire performance. The material classification and the complete wall or ceiling fire resistance must be reviewed separately.
| Fire Review Item | MR Gypsum Board | Cement Board | MgO Board |
|---|---|---|---|
| Material Behavior | Gypsum contains chemically combined water that helps delay heat transfer during calcination. | Cementitious composition generally provides strong resistance to ignition and flame contribution. | Magnesium-based composition may provide strong reaction-to-fire performance depending on formulation. |
| Fire Resistant Product Option | Available as combined fire and moisture resistant board. | Product fire characteristics should be verified for the exact cement board. | Fire claims should identify the tested board formulation and product code. |
| Hourly Rating | Requires a complete tested gypsum board assembly. | Requires a complete tested wall, floor or ceiling assembly. | Requires a complete tested assembly using the exact MgO board. |
| Substitution Risk | MR board must be specifically permitted in the fire design. | A cement board cannot replace fire-rated gypsum based only on noncombustibility. | One MgO product cannot replace another without system-level approval. |
A material may have limited contribution to fire while the completed partition still fails early through joints, framing deformation, fastener loss or heat transmission. Hourly ratings belong to tested assemblies, not to isolated board samples.
| Installation Item | MR Gypsum Board | Cement Board | MgO Board |
|---|---|---|---|
| Manual Handling | Generally easier to lift and position. | Heavier sheets may require additional labor. | Depends strongly on board density and thickness. |
| Cutting | Commonly score-and-snap with limited tool requirements. | May require carbide scoring, shears or power cutting. | Can often be scored or mechanically cut, depending on formulation. |
| Dust Control | Lower dust for basic score-and-snap cutting. | Mechanical cutting can create cementitious and silica-containing dust. | Mechanical cutting can create fine mineral dust requiring control. |
| Fasteners | Standard approved drywall screws. | Cement-board screws with suitable corrosion resistance. | Product-specific corrosion-resistant screws and compatible framing. |
| Joint Treatment | Drywall tape and joint compound for smooth decoration. | Alkali-resistant mesh and cementitious treatment. | Product-specific tape, filler and movement details. |
| Finished Appearance | Best suited to seamless painted-wall appearance. | Better suited beneath tile than exposed decorative finishing. | Can be finished, but joint cracking and compatibility must be reviewed. |
| Transport Payload | Lower board weight can improve sheets per container. | Higher density may limit sheets per container. | Container loading depends on actual product weight. |
MgO board should never be treated as one standard commodity. Binder chemistry, raw material purity, unreacted salts, reinforcement, fillers, curing and surface treatment can all affect performance.
Determine whether the board uses a chloride-based, alternative low-chloride or another magnesium-based system.
Request test data for water-soluble or free chloride where chloride-related corrosion is a project concern.
Review moisture sorption, dimensional movement and performance under high relative humidity.
Obtain wet-dry cycling, immersion, strength-retention and dimensional-stability data.
Confirm the required fastener coating or stainless-steel grade and compatibility with metal framing.
Check compatibility with primers, paints, adhesives, membranes and joint products.
Identify the actual testing framework rather than accepting a generic statement that the product meets international standards.
Review documented use in similar climates, assemblies and exposure conditions.
Some magnesium oxychloride boards can absorb moisture from humid air when residual chloride salts are not adequately controlled. Saline moisture may then affect screws, steel studs and nearby metal components. The risk should be assessed through product-specific chemical, moisture and corrosion testing.
An alternative low-chloride or chloride-free description may reduce concern about free magnesium chloride, but it does not independently prove water durability, dimensional stability or system approval. Buyers should still review the complete chemical and physical test package.
Board price per square meter is only one part of the purchasing decision. A lower-priced sheet can create a higher installed cost if it requires additional labor, special tools, premium fasteners or corrective work.
| Cost Element | MR Gypsum Board | Cement Board | MgO Board |
|---|---|---|---|
| Board Price | Usually lowest for suitable interior applications. | Generally higher than MR gypsum board. | Varies widely by composition and certification. |
| Freight Cost | Lower weight can reduce cost per installed area. | Higher density can increase freight and handling cost. | Must be calculated from actual mass per square meter. |
| Cutting Labor | Fast score-and-snap installation. | More cutting time and tool wear. | Depends on hardness and cutting method. |
| Finishing Labor | Efficient for painted drywall finishes. | Efficient beneath tiles but less suited to drywall finishing. | Requires a validated proprietary finishing system. |
| Accessory Cost | Drywall screws, tape and compound. | Special screws, alkali-resistant tape and mortar. | Potentially premium screws, primers and joint materials. |
| Compliance Risk | Low when used within clearly defined interior applications. | Low when supported by recognized tile-backer standards and system instructions. | Can be higher where product standards, chemistry and approvals are unclear. |
| Repair Risk | Higher if incorrectly installed in continuously wet zones. | Higher if waterproofing and movement joints are omitted. | Higher if moisture movement or corrosion appears after enclosure. |
Identify the wall, ceiling, floor, shower, exterior sheathing or render substrate being specified.
Separate humidity, splashing, direct spray, standing water, condensation and weather exposure.
Confirm whether the finish is paint, tile, stone, render, wallpaper or another coating.
Check fire, acoustic, impact, mold, structural and thermal requirements.
Identify the applicable gypsum, cement backer, MgO or destination-market testing framework.
Verify framing, fasteners, joints, membrane, adhesive and finishing materials together.
Match physical samples with the test reports, product code and factory information.
Prohibit substitutions or formulation changes without written technical approval.
The supplier does not distinguish humidity, wet zones and continuous water exposure.
Board data is supplied without joints, fasteners, membrane or finish details.
Standard drywall screws and tape may be incompatible with the cementitious substrate.
The buyer cannot evaluate chloride, moisture movement or corrosion risk.
A material test is incorrectly presented as a complete wall fire rating.
Tile and grout are incorrectly treated as the only water-control layer.
The supplied factory may not be included in the tested or certified scope.
Framing load, labor and container payload may be incorrectly calculated.
Similar thickness does not prove equal moisture, fire or structural performance.
Joint cracking or surface incompatibility may occur.
Metal components may be exposed to moisture and chloride-related attack.
Interior moisture tests do not establish weather-exposure durability.
Moisture Resistant Gypsum Board For Approved Interior Wall Or Ceiling Applications, Specified Thickness And Dimensions, Applicable ASTM C1396 Or EN 520 Classification, With Declared Water Absorption Data, Product Identification, Batch Traceability And Manufacturer Installation Instructions.
Fiber-Reinforced Cementitious Backer Board For Approved Wet And Dry Tile Applications, Compliant With The Applicable Cement Backer Product Standard, Specified Thickness And Dimensions, Supplied With Compatible Corrosion-Resistant Fasteners, Alkali-Resistant Joint Tape And Complete Installation Instructions.
Magnesium-Based Building Board, Exact Binder Chemistry And Manufacturer Product Designation As Approved, Specified Thickness, Density And Dimensions, With Detailed Binder Composition Data, Moisture-Movement Testing, Water-Durability Results, Fastener Compatibility, Fire Documents, Batch Traceability And System Installation Instructions.
Cement board is generally more appropriate for demanding tiled wet zones. Moisture resistant gypsum board is usually more efficient for humid interior dry zones and smooth painted finishes.
It may be used where the exact board and installation system are approved. Direct-spray areas may require a dedicated wet-area substrate and waterproof membrane.
No. Cement board is water-durable, but water can pass through joints, penetrations and the board. A waterproof membrane may still be required.
Not automatically. MgO products may offer useful fire, weight or moisture characteristics, but performance varies greatly by formulation and quality control. Cement board has a more established position as a wet-area tile substrate.
No. Some products use magnesium oxychloride, while others use alternative low-chloride or different magnesium-based binders. The exact chemistry should be declared and tested.
Certain chloride-containing products may create corrosion risk when they absorb moisture. Request chloride, moisture-sorption and fastener-compatibility data for the exact product.
A ceiling-approved moisture resistant gypsum board is often the most practical choice because it is lighter and easier to finish. Framing spacing, sag resistance and ventilation must still be confirmed.
Use a specifically approved floor and shower-base system. Ordinary moisture resistant gypsum board should not be used as the shower-pan substrate.
Not without an approved tested assembly. Noncombustible material characteristics do not automatically reproduce the hourly rating of a gypsum board wall system.
Moisture resistant gypsum board normally has the lowest installed cost in appropriate interior dry and humid zones. Cement board may provide better lifecycle value in repeated wet exposure. MgO cost depends on testing, accessories and compliance risk.
It is possible only when one approved system covers every exposure and finish. In many projects, using MR gypsum in dry zones and a wet-area substrate in shower zones is more economical.
Confirm application, exposure zone, product standard, thickness, weight, water durability, fire requirements, finishing method, fasteners, membrane, chemical composition, factory and batch traceability.
Provide the room type, dry or wet zone, wall, ceiling or floor application, final finish, destination standard, fire requirement, board thickness and project quantity. The appropriate moisture resistant gypsum board, cement board or MgO system can then be reviewed for performance, installation cost and export supply.
