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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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Gypsum wallboard, as well as other building products and materials, is subject to some form of movement induced by changes in moisture, temperature or both.

Control joints are recommended at doorjambs, extending from door head to ceiling. Architects sometimes fail to specify control joints. Gypsum board assembly shall conform to acoustical tests of the specification where sound control is required.

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

Gypsum board shall be cut by scoring and breaking or by sawing, working from the face side. These details are based on Warnock Hersey International, Inc.

For specific precautionary statements, see 4. Construction details for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.

The requirement for control joints is addressed in both of these documents. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

The PDF Download is licensed per individual in which the individual can place on up to four electronic devices for their personal use. All materials shall be kept dry.

Where doorjambs extend from floor to ceiling and are spaced less than 30 feet apart, no control joints are required. This specification covers requirements for the methods of application and finishing of gypsum board. Construction details for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.

This specification covers requirements for the methods of application and finishing of gypsum board.

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

The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Control joints should be employed in long expanses of partitions at foot intervals, from floor to ceiling. To relieve the stresses that occur as a result of such movement, control joints are required in both partitions and ceilings.

Download NGC app from your smartphone. This abstract is a brief summary of the referenced standard. Isolation joints should be installed where structural elements such as slabs, columns or exterior walls can bear directly on non-load bearing partitions.

Materials categorized under this specification include: Gypsum board assembly shall conform to acoustical tests of the specification where sound control is required. 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. We recommend users of early versions of Internet Explorer to update to Version 10 or later. Gypsum board shall be cut by scoring and breaking or by sawing, working from the face side.

These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the specification.

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. Astk “through wall” control joints are required in fire-rated assemblies, special details See drawing are necessary. You must have JavaScript enabled in your browser to utilize the functionality of this website. In some cases when control joints are specified, the drawings are 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.

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 atm 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.

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 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. This asrm does not purport to address all of the safety concerns, if any, associated with its use.

Cracking may also be caused by stresses resulting from astj movement.

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

Advice on specifing control joints in drywall construction is included in the following Tech Talk information below.

Semi-solid Gypsum Board Partitions.

A fire test of assemblies shall be conducted to determine a fire resistance rating required for gypsum board assembly. For a volume license the PDF is licensed to the person in which it is assigned.