National Gypsum Company, Drywall, Cement Board, Gypsum Board, Finishing Products. Type X gypsum wallboard, 5/8" in thickness ("5/8"Type X wallboard"), is manufactured for use as one component of an assembly/system (such as a wall) where a fire resistance rating is required in a residential, commercial, or other structure by an applicable building code. Type X wallboard must be manufactured in accordance with established ASTM standards defining.
. relying on the generic assemblies/systems contained in the Gypsum Association's Fire Resistance Design Manual subscribe to an on. NATIONAL GYPSUM. Association releases 2015 Fire Resistance Design Manual. Source. For a basic 500 square feet project, the cost to Hang Gypsum Board averages for job quality and. Gypsum Fire Resistance Design Manual Since 1959, the Gypsum Association has engaged extensively in testing and In the latest version of the Gypsum Fire Resistance. . flagship publication depicts over 600 systems that may be used for fire-rated walls and. to review “Fire Resistance Design Manual. National Gypsum. Gypsum Fire Resistance Design Manual 19th Edition includes fire. Gypsum Fire Resistance Design Manual, PDF. the National Fire Codes and many state and.
Type X wallboard as that which provides not less than one- hour fire resistance when tested in specified building assemblies/systems in a laboratory setting under certain controlled conditions and pursuant to certain ASTM procedures. Because ASTM procedures require that fire tests be conducted on complete building assemblies/systems and not just on the wallboard by itself, the ability of a particular 5/8"Type X wallboard product to pass a specific ASTM fire test may well depend on factors other than the fire resistance of the wallboard being tested. These factors include the other components used to construct the building system being tested, the manner in which the system is constructed, and the inherent variability of ASTM fire tests.
Independent third- party organizations, such as Underwriters Laboratories Inc. UL), may authorize manufacturers to certify or label their 5/8"Type X wallboard as acceptable for use in one- hour fire- rated systems based on criteria established by the third- party organizations. The third- party organizations may approve changes to certified formulations using criteria they believe appropriate, such as new full- scale ASTM fire tests, small- scale fire tests, or engineering studies and evaluations, and without requiring a full- scale ASTM one- hour fire test. Accordingly, the fact that a particular 5/8"Type X wallboard product has been certified as acceptable for use in one- hour fire- rated systems by a third- party organization does not necessarily mean that wallboard made according to that specific formulation has been subjected to a full- scale ASTM one hour fire test. Given the very different circumstances that may exist from one fire to another, the differences between conditions in an actual fire and the laboratory conditions in which a test is conducted, and the inherent variability of ASTM fire tests, passing an ASTM fire test in a controlled laboratory setting or certifying or labeling of 5/8"Type X wallboard as acceptable for use in one- hour fire- rated assemblies/systems under third- party certification or labeling procedures does not mean that either a particular assembly/system incorporating 5/8"Type X wallboard or any given piece of 5/8"Type X wallboard will necessarily provide "one- hour fire protection" in an actual fire or last for an hour in a new laboratory fire test. Even if 5/8"Type X wallboard is referred to using terms like "one- hour board" or "has a one- hour fire rating," this does not mean that either a particular assembly/system incorporating 5/8"Type X wallboard or any given piece of 5/8"Type X wallboard will necessarily last for an hour in a new laboratory fire test or provide "one hour fire protection" in an actual fire.
Once a 5/8"Type X wallboard formula has been certified by a third- party organization, the company using that formula to manufacture 5/8"Type X wallboard does not have to conduct periodic fire tests on that wallboard as long as the company follows the procedures established by that third- party organization to ensure that the wallboard is manufactured in compliance with the certified formula. Background and Discussion 5/8" Type X gypsum wallboard, 5/8" in thickness, is currently manufactured in accordance with ASTM Standard C 1.
The Gypsum Association FIRE RESISTANCE DESIGN MANUALis. curring fire resistance from the gypsum in the. National Gypsum Company - 1/2' Gold Bond. Fire-resistance rated gypsum board systems. National Gypsum Company. 52 GA-600-2009 FIRE RESISTANCE DESIGN MANUAL. Gypsum Association Fire Resistance Design Manual 19th Edition. Design State Operations Manual Fire Resistance Design Manual Gypsum. Association Fire.
One section of ASTM C 1. Type X gypsum wallboard to meet specific requirements when tested using the test method defined in an ASTM Standard, the E 1. Standard Test Method for Fire Tests of Building Construction and Materials.
Additionally, all gypsum wallboard manufacturers in the United States subscribe to an independent third- party certification and labeling service such as UL to ensure product consistency and quality. ASTM E 1. 19 was initially published in 1. ASTM C 1. 9) and has been used continuously since then as the principal method to test the fire- resistance of construction assemblies/systems. Similar protocols from other standards groups or laboratories were developed later and are used in some cases.) Refinements have been made in the standard since 1.
The test method described in the ASTM E 1. By the standard's own definition, ASTM E 1. ASTM E 1. 19 does, however, generate results that can be used to evaluate the general fire resistance of assemblies/systems made up of multiple components, such as walls, columns, slabs, and floor- and roof- ceiling systems under laboratory conditions. The ASTM E 1. 19 standard does not contain specific details for construction of the test furnace.
Since test furnaces are subject to variation due to individual characteristics of construction and design, including ventilation, atmospheric conditions, and general thermal tendencies, test results are typically not fully repeatable or reproducible from one laboratory to another. Test results attained in an E 1. Additionally, differences in assembly/system components and construction methods, the design and control features of individual furnaces, and other variables regarding the testing regimen, can cause wide fluctuations in ASTM E 1. A fire test, therefore, is a snapshot of a single assembly/system at a given time that includes the measurement of the performance of a specific assembly/system, composed of specific materials, constructed in a specific test furnace, on a specific day.
This simply means that for a "one- hour fire rating" of a gypsum board assembly/system, all requirements of an ASTM E 1. The ASTM E 1. 19 test method does not incorporate all dynamics essential for fire hazard analysis or fire risk assessment of the assemblies/systems under conditions in an actual fire situation. The results of an ASTM E 1. Model building codes reference the ASTM E 1. Gypsum board systems are tested based on the requirements of the ASTM E 1. Referencing the same test method(s) by the building codes facilitates the descriptions and comparisons of fire resistance ratings of assemblies/systems that have been objectively evaluated. Numerical fire resistance ratings created by ASTM E 1.
The higher the numerical rating (i. The hourly fire resistance ratings found in commercial and residential building codes that refer to an ASTM E 1. Fire resistance classifications are based on results of tests conducted on assemblies/systems created with specific materials and built in a specified manner; therefore, variations from the test conditions or the construction specifications (including, but not limited to, the type and size of materials and the method of construction) will affect the results of fire tests. Because fire exposure conditions vary with changes in a wide variety of factors, including the amount, nature, and distribution of available fuel; ventilation; and the size, configuration, and other characteristics of the compartment, the test method contained in the ASTM E 1.
Fire resistance ratings created through use of the ASTM E 1. ASTM E 1. 19 test results should not be construed as having determined performance of an assembly/system under different conditions.
To maintain industry- wide quality assurance standards for 5/8"Type X gypsum wallboard, the Gypsum Association requires that all member companies relying on the generic assemblies/systems contained in the Gypsum Association's Fire Resistance Design Manual subscribe to an on- going, third- party, in- plant product inspection and labeling service. This objective certification and labeling process ensures that manufacturers continue to manufacture the same quality of product as that originally tested. For more information on Underwriters Laboratories testing, certification, follow- up, and labeling procedures, visit its Web site at http: //www. PLEASE NOTE: There are systems that have third- party- approved ratings for fire resistance which may utilize gypsum wallboard other than Type X or which may use more than one layer of Type X along with other materials.
These ratings can vary from 3. Type X gypsum wallboard are based upon standard ASTM test methods for determining system fire resistance. The third party approvals for such other systems, like the one- hour systems using Type X gypsum wallboard, may be based upon full- scale ASTM fire tests, small- scale fire tests, or engineering studies and evaluations. While this article on the subject of Fire and Safety Information deals expressly with 5/8” Type X gypsum wallboard, the principles discussed may also be relied upon to help understand the meaning of the fire resistance ratings of these other systems.
For further information, see the current edition of the National Gypsum Construction Guide or call 1- 8.