Fire-Resistant Gypsum Board
Fire-resistant gypsum boards fixed to a steel-stud partition
Fire-resistant gypsum board is reviewed with product-specific thickness and recognition information when a fire-compartment wall system is being specified. Before relying on a product name or time label, compare the designed wall assembly, required performance, and the applicable system documentation and recognition scope.
Best for
Situations where this material fits especially well.
- Projects that can first confirm the required scope and designed fire-compartment wall assembly
- Quotes that can compare a board product page with the recognition and technical documents for the wall system
Avoid if
Conditions worth checking again before choosing.
- The wall assembly and required performance are still undefined
- A board thickness or time label is being used to decide code suitability
Buying checklist
Items to review when you are close to making a decision.
- Has the design requirement for the fire compartment or fire-resistance wall been confirmed?
- Is the intended wall system's recognition scope and technical documentation available?
Warnings
Points that are easy to misunderstand or can lead to defects.
- The one-hour, 1.5-hour, and two-hour labels belong respectively to the Knauf 12.5 mm, 15 mm, and 19 mm product pages.
- Do not decide an entire wall's fire-resistance performance or code suitability from board thickness or product name alone.
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Gypsum board is a common interior base board made from a gypsum core and used to create flat wall and ceiling planes over framing. It disappears behind paint, wallpaper, film, panels, or built-ins, yet the board type, thickness, layer count, framing, joint treatment, backing, moisture condition, and fire or sound requirements need to be settled before the finish hides the work.
MDF is a medium-density engineered wood fiberboard made by pressing wood fibers with a bonding system into smooth, uniform panels. It is widely considered for painted cabinets, mouldings, doors, built-ins, shelves, and wall-panel substrates, but moisture, load, screw holding, fire rating, and emissions claims all depend on the exact grade, thickness, edge detail, and certificate.
Material details
Its Role in a Fire-Compartment Review
Fire-resistant gypsum board is reviewed as part of a fire-compartment, fire-resistance wall system. This entry does not set wall performance from the board name alone. First identify the designed wall assembly and the required scope, then compare the product documentation with the recognition documents for that assembly.
Separate the Board Product from the Wall System
Official product pages present fire-resistant gypsum board as an example for fire-compartment wall systems. The manufacturer's drywall-system page also notes that performance can vary with the system and its requirements, and directs specifiers to confirm each system's technical documents before finalizing a specification. Board thickness, layer count, fixing method, and surrounding construction remain items to check in the recognized system documentation.
Read Thickness and Time Labels by Product
The Knauf 12.5 mm fire-resistant board page lists a one-hour fire-resistance construction recognition, the 15 mm page lists 1.5 hours, and the 19 mm page lists two hours. Treat these as product-page information for comparison. Do not turn the time number into a result of thickness alone or a promise for a different wall assembly; check that the selected system's recognition and technical documents describe the same configuration.
Questions for the Quote and Site
Put the required performance, wall location, intended system document, board product, and thickness on the quote. Confirm that the configuration named in the recognition document matches the drawings and installation plan, and ask whether openings, penetrations, or finish conditions need separate criteria. Where moisture, acoustic, or thermal performance is also required, consult the applicable product or system documentation in addition to the fire-resistant board data.
How to Read the Official Product Examples
Knauf Fire-Resistant Gypsum Board 12.5 mm, 15 mm, and 19 mm are examples confirmed on official product pages. The 12.5 mm page lists 900 × 1,800 × 12.5 mm; the 15 mm page lists 1,800 mm length with 900 or 1,200 mm width; and the 19 mm page lists 900 × 1,800 × 19 mm. Recheck dimensions, recognition wording, sales status, and actual applicability against the selected product documentation and the project's system documents.
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