ASTM C840 PDF

ASTM C Standard Specification for Application and Finishing of Gypsum Board. ASTM C or GA provides the following requirements for installing control joints in gypsum board assemblies: Section (GA & GA. This specification covers requirements for the methods of application and finishing of gypsum board. Construction details for a specific assembly to achieve the.

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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. All materials shall be kept dry. Construction details for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, c84 evaluations, or listings from recognized fire testing laboratories.

For specific precautionary statements, see 4. One component of gypsum board construction often overlooked by architects and contractors is the control joint.

Masonry or concrete walls shall be dry, free of dust, oil, or form release agents, aastm or voids, or foreign matter that inhibit bond for adhesively applied gypsum board.

Even if control joints do not appear to be specified they are often covered by reference specification. This specification covers requirements for the methods of application and finishing of gypsum board. Additionally, control joints should be asmt in ceilings to limit dimensions in either direction to 50 feet.

Isolation joints should be installed where structural elements such as slabs, columns or exterior walls can bear directly on non-load bearing partitions. Gypsum board assembly shall conform to acoustical tests of the specification where sound control is required. Construction details for a specific assembly asgm achieve the required fire resistance shall be f840 from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.

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You must have JavaScript enabled in your browser to utilize the functionality of this website. Even in the best of circumstances, when control joints have been specified and properly detailed, estimators may neglect to include them in the bid, and project managers are faced with managing a job with unforeseen costs.

ASTM C – 18b Standard Specification for Application and Finishing of Gypsum Board

A fire test of assemblies shall be conducted to determine a fire resistance rating required for gypsum board assembly. Control joints are recommended at doorjambs, extending from door head to ceiling.

In some cases when astmm joints are specified, the drawings v840 not coordinated with the specifications and the control joint details are frequently missed. Moreover, gypsum assembly shall conform to framing size, fasteners spacing, ventilation, substrate, surface preparation, cutting, and installation application as indicated in the specification.

Download NGC app from your smartphone. C8400 board assembly shall conform to acoustical tests of the specification where sound control is required. JavaScript seems to be disabled in your browser. Masonry or concrete walls shall be dry, free of dust, oil, or form release agents, protrusions or voids, or foreign matter that inhibit bond for adhesively applied gypsum board.

Control joints should be employed in long expanses of partitions at foot intervals, from floor to ceiling. Control joints should be installed where ceiling framing or furring changes direction.

ASTM C 840—08 Specification for Application and Finishing of Gypsum Board (PDF Download)

Gypsum wallboard, as well as other building products and materials, is subject to some form of movement induced by changes awtm moisture, temperature or both. These details are based on Warnock Hersey International, Inc. When “through wall” control joints are required in fire-rated assemblies, special details See drawing are necessary. Where gypsum board is stored outside, it shall be off the ground, properly supported on a level platform and fully protected from the weather or direct sunlight exposure.

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Gypsum board shall be cut by scoring and breaking or by sawing, working from the face side. ASTM does not give aastm warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Control joints are frequently necessary to prevent cracking in gypsum wallboard. Control joints are required in ceilings to limit areas qstm 2, square feet. This specification covers requirements for the methods of application and finishing of gypsum board.

National Gypsum Company, Drywall, Cement Board, Gypsum Board, Finishing Products

Gypsum board shall be cut by scoring and breaking or by sawing, working from the face side. Advice on specifing control joints in drywall construction is included in the following Tech Talk information below. We recommend users of early versions of Internet Explorer to update to Version 10 or later.

Where gypsum board is stored outside, it shall be off the ground, properly supported on a level platform and fully protected from the weather or direct sunlight exposure.

A fire test of assemblies shall be conducted to determine a fire resistance rating required for gypsum board assembly.