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| Markenbezeichnung: | SUNHOUSE |
| MOQ: | 500 STÜCK |
| Lieferfähigkeit: | 3000000 Meter/misst pro Monat |
Gypsum board thickness and layer quantity directly affect system weight, material consumption, installation time and project cost. However, they do not independently determine whether a wall or ceiling achieves 30, 60, 90 or 120 minutes of fire resistance. Correct procurement requires buyers to match the exact board type, thickness, number of layers and installation details with a tested or listed construction.
Confirm the exact metric or imperial thickness shown in the approved system instead of selecting only by price per sheet.
Identify the required base layer, face layer and total number of layers on each side of the framing.
Review joint staggering, board orientation and perimeter treatment because continuous joints can create weak paths.
Check studs, insulation, screws, spacing and penetrations together with the board configuration.
A thicker fire resistant board can provide more gypsum mass and may remain protective for longer under heat exposure. A multilayer lining can also provide additional protection by increasing the amount of gypsum and reducing direct paths through board joints. Nevertheless, the final rating belongs to the complete tested construction rather than to an individual sheet.
A 15mm, 15.9mm or 5/8-inch fire resistant board is not automatically a one-hour board. Two layers are not automatically a two-hour system. The required duration must be supported by a complete assembly that identifies the board type, manufacturer or permitted product designation, framing, fasteners, insulation and installation details.
Product thicknesses vary by country, manufacturer and standard. The following table provides a procurement overview only. The approved project assembly remains the controlling specification.
| Nominal Thickness | Common Market Position | Typical Procurement Consideration | Important Limitation |
|---|---|---|---|
| 9.5mm | Lightweight interior board or ceiling board in selected markets. | Lower unit weight and easier handling may support non-fire-rated or specially tested lightweight systems. | It should not be treated as a general substitute for thicker fire resistant gypsum board. |
| 12mm | Common general-purpose thickness in some international markets. | Confirm whether the supplied product is standard, fire resistant, moisture resistant or a combined-performance board. | A general 12mm board should not be substituted for a tested 12.5mm or 15mm system component. |
| 12.5mm | Widely used metric thickness for walls and ceilings. | Available in standard, Type F, Type DF and other market-specific fire resistant classifications. | Fire performance depends on board classification and complete system configuration. |
| 12.7mm / 1/2 Inch | Common North American nominal thickness. | May be available as regular board, proprietary Type X, Type C or other specialty products. | Regular 1/2-inch board and proprietary 1/2-inch Type C board are not equivalent. |
| 15mm | Common metric fire resistant board specification. | Frequently considered for fire rated walls, ceilings, shafts and commercial applications. | Do not assume equivalence with 15.9mm or 5/8-inch Type X without system approval. |
| 15.9mm / 5/8 Inch | Widely recognized North American Type X thickness. | Commonly used as one component in listed fire rated wall, column, floor-ceiling and roof-ceiling assemblies. | The board is not an independent one-hour barrier outside an approved assembly. |
| 18mm And Above | Specialty board, high-density panel or market-specific system. | May support enhanced impact, acoustic, structural or fire performance where specifically tested. | Extra thickness does not automatically create a higher fire classification or permit fewer layers. |
A single-layer system uses one gypsum board layer on one or both sides of the framing. It may offer lower material use, faster installation and less wall thickness when supported by an approved design.
A double-layer system generally uses a base layer and a face layer. It can increase gypsum mass, protect underlying joints and support higher fire, acoustic or impact performance when included in a tested design.
A layer used in a 30-minute assembly plus another similar layer does not automatically create an approved 60-minute assembly. The performance of multiple layers depends on the complete construction, sequence of failure, framing behavior, joint arrangement, fixing system and test conditions.
In a multilayer fire rated system, each layer has a specific position and fixing requirement. The base layer is installed closest to the framing, while the face layer forms the final exposed surface. These layers should not be reordered, omitted or replaced without checking the approved design.
This illustration explains the general layer sequence only. Actual board thickness, number of layers, framing, insulation and fixing details must follow the tested or listed system.
| Layer Position | Main Function | Procurement Information To Confirm |
|---|---|---|
| Base Layer | Provides the first gypsum membrane over the framing and supports the face-layer construction. | Board type, thickness, orientation, fastener type, fastener length, screw spacing and treatment of base-layer joints. |
| Face Layer | Adds protective mass, covers base-layer joints and forms the final surface. | Board type, thickness, joint offset, longer fasteners, finishing method and perimeter treatment. |
| Opposite Wall Face | Completes the partition and may be essential when fire exposure is possible from either direction. | Confirm whether the construction is symmetrical or uses different board layers on each side. |
| Shaft Or Cavity Liner | Forms part of a proprietary shaft wall or cavity system. | Exact liner thickness, edge profile, framing system and listed product designation. |
| Ceiling Membrane | Protects joists, floor structures, roof structures or services above the ceiling. | Number of layers, board orientation, suspension system, resilient channels, fasteners and perimeter details. |
Board joints are potential paths for heat, flame and smoke. In multilayer systems, joints are commonly offset so that a face-layer joint does not directly align with the joint in the base layer. The exact offset and installation pattern must follow the approved assembly.
The distance between base-layer and face-layer joints, the direction of board installation and the treatment of horizontal and vertical joints vary between systems. Installers should follow the tested drawing rather than choosing an offset based only on site convenience.
Regular board, Type X, proprietary Type C, Type F and Type DF products should not be treated as interchangeable.
The system may require one, two or more layers on each face, with different arrangements around shafts, columns or ceilings.
Steel studs, timber studs, channels, joists and proprietary framing systems respond differently during fire exposure.
Framing depth, gauge, center spacing and maximum wall height form part of the tested system.
Screw type, length and spacing vary between base layers, face layers, wood framing and steel framing.
Mineral wool or glass fiber insulation may be mandatory, optional or restricted depending on the assembly.
Tape, joint compound, perimeter sealants and fastener-head treatment must follow the system requirements.
Horizontal or vertical board orientation can affect joint layout, framing support and permitted installation details.
Fastener selection becomes more important as layer quantity increases. Face-layer screws must pass through the outer board and provide the required engagement with the framing or approved base material. Screw selection should therefore be based on the complete layer build-up rather than one board thickness.
Excessive, incorrectly positioned or over-driven screws can damage board edges and facing paper. The correct approach is to follow the tested or listed screw type, length and spacing rather than adding fasteners without technical justification.
| Building Element | Configuration Focus | Key Procurement Questions |
|---|---|---|
| Partition Wall | Board layers on each side, stud depth, stud spacing, insulation and maximum wall height. | Is the system symmetrical, and can fire exposure occur from either side? |
| Corridor Wall | Fire resistance, impact exposure, acoustic privacy and service penetrations. | Is an abuse-resistant or moisture-resistant face layer required? |
| Shaft Wall | Shaft liner, C-H or proprietary studs, face layers and installation from one side. | Does the quotation include the exact shaft liner and framing system? |
| Floor-Ceiling System | Ceiling membrane layers, joists, channels, insulation, subfloor and finish flooring. | Is the board attached directly to framing or through resilient or furring channels? |
| Roof-Ceiling System | Ceiling board, suspension method, roof structure, insulation and cavity design. | Does the tested construction require Type X or a proprietary Type C board? |
| Structural Column | Number of enclosure layers, corner treatment, attachment and column dimensions. | Is the exact board product and enclosure geometry listed in the approved design? |
| Service Enclosure | Board continuity around ducts, pipes, cables and access openings. | Are compatible fire stopping and access-panel systems included? |
The examples below explain purchasing logic rather than prescribing a specific fire rating. Final systems must be selected from approved project documentation.
A thinner or single-layer board option may appear cheaper, but total installed cost depends on much more than sheet price. Buyers should compare the complete wall or ceiling system.
Include board layers, studs, tracks, insulation, screws, tape, joint compound, sealants, trims, pallets and expected material waste.
Consider unloading, board lifting, cutting, fixing, joint treatment, drying time, sanding, access equipment and quality inspection.
Include the cost of rejected submittals, redesign, replacement material, site delays and rework caused by an unapproved thickness or layer change.
| Cost Item | Single-Layer Effect | Double-Layer Effect |
|---|---|---|
| Board Quantity | Lower quantity per wall face. | Approximately twice the lining area per wall face before waste allowance. |
| Fastener Use | One primary fixing operation. | Separate fixing requirements for base and face layers. |
| Installation Time | Generally faster when the approved system permits one layer. | Additional lifting, positioning, fixing and inspection time. |
| Joint Treatment | Final exposed joints require finishing. | Base-layer treatment depends on the assembly; face-layer joints require finishing. |
| Transport Weight | Lower total board tonnage. | Higher container weight and potential loading limitations. |
| Damage Tolerance | Damage affects the only board layer. | Outer and inner layers provide a more robust lining where correctly installed. |
| System Approval | Must match an approved single-layer construction. | Must match the exact multilayer construction and joint arrangement. |
Add an appropriate project waste allowance based on board size, wall geometry, openings, cutting requirements, handling conditions and expected damage. Calculate both wall faces separately when the number or type of board layers differs.
For a partition with two board layers on each side, calculate four total lining layers across the wall area. Deducting openings should be considered carefully because door and window areas may create additional cutting waste, returns, headers and reinforcing details.
The supplied board may no longer match the approved fire rated system.
The fire, acoustic and structural performance may all be affected.
A rounded metric thickness may be incorrectly treated as an imperial equivalent.
The assembly may require fire resistant board in every layer.
Proprietary Type C performance may be essential to the listed system.
Aligned joints may create a direct weak path through the multilayer lining.
Face-layer screws may not achieve the required framing engagement.
The wall may fall outside structural and fire system limitations.
Adding or changing insulation is not automatically permitted in every assembly.
Unprotected penetrations can compromise the continuity of the fire barrier.
Multilayer systems can affect handling, container payload and framing design.
Adding untested layers does not automatically create a recognized system.
No. Greater thickness may provide more gypsum mass, but the final fire rating depends on the complete tested assembly. A thicker unapproved board should not replace the specified product automatically.
No. Fire resistance periods cannot be added in this way. The double-layer construction must be supported by a tested or listed wall system.
Not automatically. Two layers provide different joint coverage, fixing behavior and failure sequence compared with one thick board. Any substitution requires approved technical documentation.
Only when the approved system permits the metric product and its exact classification. The nominal dimensions are close but are not automatically technically equivalent.
Follow the assembly specification. Some systems require fire resistant board in every layer, while others may specify different products for particular positions.
Requirements vary between systems. Some assemblies specify treatment of base-layer joints, while others rely on the covering face layer. The tested installation instructions should control the decision.
Only when the approved system permits gypsum-to-gypsum attachment using the specified fasteners or adhesive. Many systems require face-layer fasteners to engage the framing.
Many multilayer systems require staggered joints. The exact arrangement should follow the approved drawing rather than a general site rule.
Additional layers may appear conservative, but they can change system weight, fastener engagement, framing loads and construction details. Obtain technical approval before modifying the tested system.
Confirm board classification, thickness, dimensions, layer quantity, layer position, assembly number, framing, fasteners, insulation, joint arrangement, packaging and product identification.
Provide the required fire duration, destination standard, assembly number, wall or ceiling structure, board type, thickness, number of layers and project quantity. The configuration can then be reviewed for technical compliance, material consumption, container loading and total project cost.
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