1、Designation:C128012 Designation: C1280 12aStandard Specification forApplication of Gypsum SheathingApplication of ExteriorGypsum Panel Products for Use as Sheathing1This standard is issued under the fixed designation C1280; the number immediately following the designation indicates the year oforigin
2、al adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1This specification covers the minimum requirements for and method
3、s of application of gypsum sheathing for use as asubstrate for exterior wall cladding.1.1 This specification covers the minimum requirements for and methods of application of exterior gypsum panel products thatare specifically designed for use as a substrate for exterior cladding.1.1.1 This specific
4、ation does not cover gypsum panel products that are specifically designed for interior applications.1.2 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports offire-resistance tests, engineering evaluations, or listings from recognized
5、 fire testing laboratories.1.2.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)than the fire-rated construction.1.3 Where sound control is required for a gypsum sheathingpanel product assembly, the details of construction s
6、hall be inaccordance with the acoustical test report of an assembly that has met the required acoustical value(s).1.3.1 This specification shall govern where it is more stringent (size or thickness of framing and size and spacing of fasteners)than the sound-rated construction.1.4 Where resistance to
7、 racking loads or shear is required for a gypsum sheathingpanel product assembly, the details ofconstruction shall be in accordance with the racking or shear test report of an assembly that has met the required racking or shearvalue(s).1.4.1 This specification shall govern where it is more stringent
8、 (size or thickness of framing and size and spacing of fasteners)than the racking or shear-tested construction.1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and
9、are not considered standard.1.6 The text of this standard references footnotesnotes which provide explanatory material. These footnotesnotes shall not beconsidered as requirements of the standard.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its us
10、e. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Building Materials and SystemsC
11、954 Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studsfrom 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in ThicknessC955 Specification for Load-Bearing (Transverse and Axial) Steel Studs, Runners (Tracks), and Bracing or Bridging for
12、 ScrewApplication of Gypsum Panel Products and Metal Plaster BasesC1002 Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal PlasterBases to Wood Studs or Steel StudsC1007 Specification for Installation of Load Bearing (Transverse and Axial) Stee
13、l Studs and Related AccessoriesC1063 Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster1This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsi
14、bility ofSubcommittee C11.03 on Specifications for the Application of Gypsum and Other Products in Assemblies.Current edition approved April 1,July 15, 2012. Published MaySeptember 2012. Originally approved in 1994. Last previous edition approved in 2011 as C1280 11. DOI:10.1520/C1280-12A.2For refer
15、enced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provid
16、e the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the st
17、andard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.C1177/C1177M Specification for Glass Mat Gypsum Su
18、bstrate for Use as SheathingC1278/C1278M Specification for Fiber-Reinforced Gypsum PanelC1396/C1396M Specification for Gypsum Board2.2 U.S. Department of Commerce Publication:PS20 American Softwood Lumber Standard33. Terminology3.1 Definitions: DefinitionsDefinitions shall be in accordance with Term
19、inology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 exterior cladding, na permanent material or system that impedes the transmission of environmental elements to thegypsum panel products used as sheathing.3.2.2 fastener, nnails, staples, or screws used for application of the sheathi
20、ng. gypsum panel product.3.2.3 framing member, nstuds, headers, bracing, and blocking that serve to receive the sheathing. gypsum panel product.3.2.4 horizontal application, na synonym for perpendicular application.3.2.5 parallel application, ngypsum sheathing panel product applied with the factory
21、edges parallel to the framing members;a synonym for vertical application.3.2.6 perpendicular application, ngypsum sheathing panel product applied with the factory edges at right angles to theframing members; a synonym for horizontal application.3.2.7 require, vto mandate by a force outside this spec
22、ification, such as a building code, project specification, contract, orpurchase order.3.2.8 specified, adjpertaining to a mandatory requirement of this specification or a referenced requirement.3.2.9 specify, vto mandate by an obligation of this standard or a referenced document.3.2.10 vertical appl
23、ication, nsynonym for parallel application.3.2.11 water-resistive barrier, na permanent material behind an exterior wall cladding that is intended to resist liquid waterthat has penetrated the exterior covering from further intruding into the exterior wall assembly.3.2.12weather-resistive barrier, n
24、a temporarily exposed protective membrane that is intended to impede the penetration ofenvironmental elements until the installation of a permanent water-resistive barrier and exterior cladding.4. Exposure After Installation4.1Gypsum sheathing board provides a substrate, which shall be covered by an
25、 exterior cladding or other weather-resistivebarrier and is not intended for long-term exposure. Gypsum sheathing board shall not be exposed to the elements for more than30 days after it has been installed. Gypsum sheathing shall be covered with a water-resistive barrier within 30 days of beinginsta
26、lled, if the exposure time is expected to be more than 30 days.4.1 Gypsum sheathing board is a paper faced substrate that shall be covered by an exterior cladding or other weather-resistivebarrier and is not intended for long-term exposure. It shall not be exposed to the elements for more than 30 da
27、ys after it has beeninstalled. Gypsum sheathing shall be covered with a weather-resistive barrier within 30 days if the exposure time will be more than30 days.NOTE 1Some building codes require an additional weather-resistive barrier. The exterior face paper of the sheathing shall be dry prior to app
28、licationof the additional weather-resistive barrier.4.2 Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing Panels provide a substrate that shall be covered by an exteriorcladding or other weather-resistive barrier and is not intended for long-term exposure. Refer to manufacturers recommendat
29、ionsfor maximum exposure time. Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing Panels shall be covered with awater-resistive barrier if exposure time is expected to exceed the manufacturers recommended maximum exposure time.4.3 Glass Mat Gypsum Substrate for Use as Sheathing provides a su
30、bstrate that shall be covered by an exterior cladding or otherweather-resistive barrier and is not intended for long-term exposure. Refer to manufacturers recommendations for maximumexposure time. Glass Mat Gypsum Substrate for Use as Sheathing shall be covered with a water-resistive barrier if expo
31、sure timeis expected to exceed the manufacturers recommended maximum exposure time.5. Materials and Manufacture5.1 Gypsum SheathingSpecification C1396/C1396M. , Section 9.5.1.1 Type X (Special Fire-Resistant) Gypsum SheathingGypsum sheathing that provides a greater degree of fire resistancethan regu
32、lar gypsum sheathing as defined in Specification C1396/C1396M.5.2 Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing PanelsSpecification C1278/C1278M, Section 8.5.2.1 Type X (Special Fire-Resistant) Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing PanelsWater-resistantexterior fibe
33、r-reinforced gypsum sheathing panels that provide a greater degree of fire resistance than regular water-resistantfiber-reinforced gypsum sheathing panels as defined in Specification C1278/C1278M.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia,
34、 PA 19111-5094, Attn: NPODS.C1280 12a25.3 Glass Mat Gypsum Substrate for Use as SheathingSpecification C1177/C1177M.5.3.1 Type X Glass Mat Gypsum Substrate for Use as SheathingGlass Mat Gypsum Substrate for Use as Sheathing thatprovides a greater degree of fire resistance than regular Glass Mat Gyps
35、um Substrate for Use as Sheathing as defined inSpecification C1177/C1177M.5.4 FastenersFasteners shall be as described in 5.2.1 5.4.1 through 5.2.35.4.3. The fastener length shall be not less than thatspecified in Table 1.5.2.15.4.1 NailsNails shall be not less than 12-gauge galvanized,716-in. (11.1
36、-mm) diameter head.5.2.2-in. (11-mm) diameter head.5.4.2 Screws:5.24.2.1 Screws for fastening gypsum sheathing panel products to wood framing members, and to steel framing members lessthan 0.033 in. (0.84-mm) in thickness, shall meet the requirements of Specification C1002.5.24.2.2 Screws for fasten
37、ing gypsum sheathing panel products to steel framing members from 0.033 to 0.112-in. (0.84 to2.84-mm) in thickness shall meet the requirements of Specification C954.5.24.2.3 Trim-head screws shall not be permitted for the attachment of gypsum sheathing. panel products.5.24.2.4 Screws for fastening s
38、elf-furred metal lath over gypsum sheathingpanel products as described in 8.2.7 shall be asspecified in Specification C1063.5.2.35.4.3 StaplesStaples shall be of galvanized steel, not less than 16-gauge,716-in. (11.1-mm)(11-mm) wide crown outsidemeasurement. Legs shall have divergent points.5.35.5 F
39、raming Members:5.3.15.5.1 Wood FramingWood framing members shall conform to PS20.5.3.25.5.2 Steel FramingLoad-bearing steel framing shall meet the requirements of Specification C955.6. Substrate, Surface Preparation6.1 The maximum spacing for framing members for gypsum sheathing panel products shall
40、 be not more than 24-in. (610-mm)on center on walls.6.1.1 Wood framing shall be straight and true, attached securely following accepted engineering practices and as required forthe intended design. The surfaces to which abutting edges or ends of gypsum sheathingpanel products are to be attached shal
41、l benot less than 112-in. (38-mm) wide. The bearing surface shall be not less than34in. (19 mm) for internal corners or angles. -in.(19-mm) for internal corners or angles.6.1.2 Load-bearing metal framing members shall be of the proper size and design for their intended use and shall be installedin a
42、ccordance with Specification C1007.7. Framing Alignment7.1 Framing members shall be installed so that the surface will be in an even plane, unless otherwise specified, after the gypsumsheathing haspanel products have been applied.TABLE 1 Minimum Fastener LengthsFramingTypeFastenerTypeSheathingThickn
43、ess, in. (mm)MinimumFastenerLength, in. (mm)Wood nails12 (12.7) 112 (38)Wood Nails12 (12.7) 1-12 (38)58 (15.9) 134 (45)58 (15.9) 1-34 (45)screws12 (12.7) 114 (32)Screws12 (12.7) 1-14 (32)58 (15.9) 114 (32)58 (15.9) 1-14 (32)staples12 (12.7) 112 (38)StaplesA12 (12.7) 1-12 (38)58 (15.9) 134 (45)58 (15
44、.9) 1-34 (45)Steel screws12 (12.7) 1 (25)Steel Screws12 (12.7) 1 (25)58 (15.9) 114 (32)58 (15.9) 1-14 (32)AStaples shall be used to apply only Gypsum Sheathing board meetingSpecification C1396/C1396M.C1280 12a38. Cutting and Application of Gypsum SheathingPanel Products8.1 Cutting Gypsum SheathingCu
45、tting Gypsum Panel Products:8.1.1 The gypsum sheathing panel products shall be cut by scoring and breaking or by sawing, working from the face side. Theface paper of faced gypsum panel products shall be cut with a sharp knife or other suitable tool when cutting by scoring. Thegypsum sheathing panel
46、product shall be broken by snapping the gypsum sheathing panel product in the reverse direction or bycutting the facer on the back papersurface with a knife or suitable tool.8.1.2 The cut edges and ends of gypsum sheathing panel products shall be trimmed to obtain neat fitting joints when installed.
47、8.1.3 Holes for pipes, fixtures, or other small openings shall be scored on the face paper before removing the cutout with a sawor special tool designed for this purpose.8.1.4 Where gypsum sheathing meets panel products meet projecting surfaces, the gypsum sheathingpanel product shall bescribed and
48、cut neatly.8.2 Application of Gypsum SheathingApplication of Gypsum Panel Products:8.2.1 Gypsum sheathing panel products shall be fitted snugly around all window and door openings.8.2.1.1Sheathing 8.2.1.1 Gypsum panel product joints shall be offset a minimum of 4-in. (100-mm) from the edge of anyope
49、ning.8.2.1.2 Gypsum sheathing panel products shall be flashed at openings so that water intrusion will not contact the sheathing.gypsum panel product.8.2.2 All vertical end and edge joints shall abut over the centers of framing members and shall be offset a minimum of oneframing space between adjacent rows of gypsum sheathing. panel products.8.2.3 Control Joints:8.2.3.1 Control joints shall be provided in wall runs exceeding 30-ft (9100-mm) in length. The distance between control jointsshall be not more than 30-ft (91
