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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Gypsum board shall be cut by scoring and breaking or by sawing, working from the face side. For a volume license the PDF is licensed asrm the person in which it is assigned.

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

Historical Version s – view previous versions of standard. Even if control joints do not appear to be specified they are often covered by reference specification. When “through wall” control joints are required in fire-rated assemblies, special details See drawing are necessary.

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ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. This abstract is a brief summary of the referenced standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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

A fire test of assemblies shall be conducted to determine a fire resistance rating required for gypsum board assembly. Materials categorized under this specification include: Semi-solid Gypsum Board Partitions.

The requirement for control joints is addressed in both of these documents. These details are based on Warnock Hersey International, Inc. Work Item s – proposed revisions of this standard.

Gypsum board assembly shall conform to acoustical tests of the specification where sound control is astk.

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Application of Vinyl Faced Gypsum Board. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. 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.

Even in the best of circumstances, when control joints have been specified and properly detailed, estimators may neglect to include them in the astn, and project managers are faced with managing a job with unforeseen costs. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

To relieve the stresses that occur as a result of such movement, control joints are required in both partitions and ceilings. All materials shall be kept dry.

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. This standard does not purport to address all of the safety concerns, if any, associated with its use. This specification covers requirements for the methods of application and finishing of gypsum board. Isolation joints should be installed where structural elements such as slabs, columns or exterior walls can bear directly on non-load bearing partitions.

Where doorjambs extend from floor to ceiling and are spaced less than 30 feet apart, no control joints are required. Cracking may also be caused by stresses resulting from building movement. Gypsum board assembly shall conform to acoustical tests of the specification where sound control is required.

JavaScript seems to be disabled in your browser. Architects sometimes fail to specify control joints. Control joints should be employed in long expanses of partitions at foot intervals, from floor to ceiling.

For specific precautionary statements, see 4. Construction details for a specific assembly to achieve the required fire resistance cc840 be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories. All materials shall be kept dry. Link to Active This link will always route to the current Active version of the standard. Construction details for a specific assembly to achieve the required fire resistance shall be ast, from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.

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This option is mobile friendly and compatible with all devices, including mobile tablets and smart phones. Control joints should be installed where ceiling framing or furring changes direction.

Moreover, gypsum assembly shall conform to framing size, fasteners spacing, ventilation, substrate, surface preparation, cutting, and installation application as indicated in the specification.

Additionally, control joints should be installed in ceilings to limit dimensions in asttm direction to 50 feet. Distribution of c80 PDF is not permitted. Download NGC app from your smartphone. This specification covers requirements for the methods of application and finishing of gypsum board. Advice on specifing control joints in drywall construction is included in the following Tech Talk information below.

Control joints are recommended at doorjambs, extending from door head to ceiling. Control joints are required in ceilings to limit areas to 2, square v840.

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. 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.

In some cases when control joints are specified, the drawings are not coordinated with the specifications and the control joint details are frequently missed.