1、Designation: C1280 13aC1280 18Standard Specification forApplication of Exterior Gypsum Panel Products for Use asSheathing1This standard is issued under the fixed designation C1280; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e 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*1.1 This specification covers the minimum requirements for and methods of application of exterior gypsum panel
3、products thatare specifically designed for use as a substrate for exterior cladding.1.1.1 This specification 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
4、 be obtained from reports offire-resistance tests, engineering evaluations, or listings from recognized 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 Wher
5、e sound control is required for a gypsum panel product assembly, the details of construction shall be in accordance withthe 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 frami
6、ng and size and spacing of fasteners)than the sound-rated construction.1.4 Where resistance to racking loads or shear is required for a gypsum panel product assembly, the details of construction shallbe in accordance with the racking or shear test report of an assembly that has met the required rack
7、ing or shear value(s).1.4.1 This specification shall govern where it is more stringent (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 parenthes
8、es are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.6 The text of this standard references notes which provide explanatory material. These notes shall not be considered asrequirements of the standard.1.7 This standard does not purport t
9、o address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.8 This international s
10、tandard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. R
11、eferenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Building Materials and SystemsC954 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 Thickness
12、C955 Specification for Cold-Formed Steel Structural Framing MembersC1002 Specification for Steel Self-Piercing Tapping Screws for Application of Gypsum Panel Products or Metal Plaster Basesto Wood Studs or Steel Studs1 This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and
13、Related Building Materials and Systems and is the direct responsibility ofSubcommittee C11.03 on Specifications for the Application of Gypsum and Other Products in Assemblies.Current edition approved Nov. 15, 2013Nov. 1, 2018. Published January 2014December 2018. Originally approved in 1994. Last pr
14、evious edition approved in 2013 asC1280 13.C1280 13a. DOI: 10.1520/C1280-13A.10.1520/C1280-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document
15、Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide 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 recomm
16、ends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700
17、, West Conshohocken, PA 19428-2959. United States1C1007 Specification for Installation of Load Bearing (Transverse and Axial) Steel Studs and Related AccessoriesC1063 Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based PlasterC1177/C1177M Spec
18、ification for Glass Mat Gypsum Substrate 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 DefinitionsDefinitions shall be in
19、accordance with Terminology 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 applic
20、ation of the gypsum panel product.3.2.3 framing member, nstuds, headers, bracing, and blocking that serve to receive the gypsum panel product.3.2.4 horizontal application, na synonym for perpendicular application.3.2.5 parallel application, ngypsum panel product applied with the factory edges parall
21、el to the framing members; a synonymfor vertical application.3.2.6 perpendicular application, ngypsum panel product applied with the factory edges at right angles to the framingmembers; a synonym for horizontal application.3.2.7 require, vto mandate by a force outside this specification, such as a b
22、uilding 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 application, nsynonym for
23、parallel application.3.2.11 weather-resistive barrier, na temporarily exposed protective membrane that is intended to impede the penetration ofenvironmental elements until the installation of a permanent exterior cladding.4. Exposure After Installation4.1 Gypsum sheathing board is a paper faced subs
24、trate 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 days after it has beeninstalled. Gypsum sheathing shall be covered with a weather-resistive barrier within 30 day
25、s 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 applicationof the additional weather-resistive barrier.4.2 Water-Resistant Exterior Fiber-Reinforced Gypsum Sheath
26、ing 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 recommendationsfor maximum exposure time. Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing Panels shall be cover
27、ed with awater-resistive barrier if exposure time is expected to exceed the manufacturers recommended maximum exposure time.4.2.1 Gypsum sheathing used in building construction shall be not less than 8 in. (200 mm) from the finish grade in fully weatherand water protected siding systems and in prope
28、rly drained and ventilated crawl spaces.All cut edges shall be protected from waterand moisture. The grounds surface in the crawl space shall be covered with a vapor retarder.4.3 Glass Mat Gypsum Substrate for Use as Sheathing provides a substrate that shall be covered by an exterior cladding or oth
29、erweather-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 exposure timeis expected to exceed the manufacturers recommended
30、 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 regular gypsum sheathing as defined in Specification C1396/C1396M.
31、5.2 Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing PanelsSpecification C1278/C1278M, Section 8.3 Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.C1280 1825.2.1 Type X (Special Fire-Resistant) Water-Resista
32、nt Exterior Fiber-Reinforced Gypsum Sheathing PanelsWater-resistantexterior fiber-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.5.3 Glass Mat Gypsum Sub
33、strate 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 Gypsum Substrate for Use as Sheathing as defined inSpecification C
34、1177/C1177M.5.4 FastenersFasteners shall be as described in 5.4.1 through 5.4.3. The fastener length shall be not less than that specifiedin Table 1.5.4.1 NailsNails shall be not less than 12-gauge galvanized, 716-in. (11-mm) diameter head.5.4.2 Screws:5.4.2.1 Screws for fastening gypsum panel produ
35、cts to wood framing members, and to steel framing members less than 0.033in. (0.84-mm) in thickness, shall meet the requirements of Specification C1002.5.4.2.2 Screws for fastening gypsum panel products to steel framing members from 0.033 to 0.112-in. (0.84 to 2.84-mm) inthickness shall meet the req
36、uirements of Specification C954.5.4.2.3 Trim-head screws shall not be permitted for the attachment of gypsum panel products.5.4.2.4 Screws for fastening self-furred metal lath over gypsum panel products as described in 8.2.7 shall be as specified inSpecification C1063.5.4.3 StaplesStaples shall be o
37、f galvanized steel, not less than 16-gauge, 716-in. (11-mm) wide crown outside measurement.Legs shall have divergent points.5.5 Framing Members:5.5.1 Wood FramingWood framing members shall conform to PS20.5.5.2 Steel FramingLoad-bearing steel framing shall meet the requirements of Specification C955
38、.6. Substrate, Surface Preparation6.1 The maximum spacing for framing members for gypsum panel products shall be not more than 24-in. (610-mm) on centeron walls.6.1.1 Wood framing shall be straight and true, attached securely following accepted engineering practices and as required forthe intended d
39、esign. The surfaces to which abutting edges or ends of gypsum panel products are to be attached shall be not lessthan 112-in. (38-mm) wide. The bearing surface shall be not less than 34-in. (19-mm) for internal corners or angles.6.1.2 Load-bearing metal framing members shall be of the proper size an
40、d design for their intended use and shall be installedin accordance 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 gypsumpanel products have been applied.8. Cutting and Applicatio
41、n of Gypsum Panel Products8.1 Cutting Gypsum Panel Products:8.1.1 The gypsum panel products shall be cut by scoring and breaking or by sawing, working from the face side. The face offaced gypsum panel products shall be cut with a sharp knife or other suitable tool when cutting by scoring. The gypsum
42、 panelproduct shall be broken by snapping the gypsum panel product in the reverse direction or by cutting the facer on the back surfacewith a knife or suitable tool.8.1.2 The cut edges and ends of gypsum panel products shall be trimmed to obtain neat fitting joints when installed.TABLE 1 Minimum Fas
43、tener LengthsFramingTypeFastenerTypeSheathingThickness, in. (mm)MinimumFastenerLength, in. (mm)Wood Nails 12 (12.7) 1-12 (38)58 (15.9) 1-34 (45)Screws 12 (12.7) 1-14 (32)58 (15.9) 1-14 (32)StaplesA 12 (12.7) 1-12 (38)58 (15.9) 1-34 (45)Steel Screws 12 (12.7) 1 (25)58 (15.9) 1-14 (32)A Staples shall
44、be used to apply only Gypsum Sheathing board meeting Specifi-cation C1396/C1396M.C1280 1838.1.3 Holes for pipes, fixtures, or other small openings shall be scored on the face before removing the cutout with a saw orspecial tool designed for this purpose.8.1.4 Where gypsum panel products meet project
45、ing surfaces, the gypsum panel product shall be scribed and cut neatly.8.2 Application of Gypsum Panel Products:8.2.1 Gypsum panel products shall be fitted snugly around all window and door openings.8.2.1.1 Gypsum panel product joints shall be offset a minimum of 4-in. (100-mm) from the edge of any
46、opening.8.2.1.2 Gypsum panel products shall be flashed at openings so that water intrusion will not contact the 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
47、 panel products.8.2.3 Control Building Construction Joints:8.2.3.1 Control joints shall be provided in wall runs exceeding 30-ft (9 m) in length. The distance between control joints shallbe not more than 30-ft (9 m).8.2.3.1 Control jointsGypsum sheathing shall be installed in walls wherever there is
48、 a building construction joint or whererequired.not be continuous through building construction joints.8.2.3.3 The location of the control joints shall be as required by either the building design or the exterior cladding specified.8.2.3.4 Control joints, other accessories, and metal plaster base sh
49、all be fastened through gypsum panel products to framingmembers.8.2.4 Gypsum panel products, 4-ft (1220-mm) wide, shall be applied either parallel or perpendicular to framing members.8.2.4.1 Square edge gypsum panel products applied perpendicular to framing members shall be covered with a water-resistivebarrier, or horizontal joints shall be sealed.8.2.5 Tongue and groove gypsum panel products shall be applied with the long dimension perpendicular to framing members,with the grooved edges down, interlocking the tongue of the gyps
