1、Designation: C1280 13aStandard 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, the year o
2、f 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 forand methods of application of exterior gypsum panel productst
3、hat are specifically designed for use as a substrate for exteriorcladding.1.1.1 This specification does not cover gypsum panel prod-ucts that are specifically designed for interior applications.1.2 Details of construction for a specific assembly toachieve the required fire resistance shall be obtain
4、ed fromreports of fire-resistance tests, engineering evaluations, orlistings from recognized fire testing laboratories.1.2.1 This specification shall govern where it is morestringent (size or thickness of framing and size and spacing offasteners) than the fire-rated construction.1.3 Where sound cont
5、rol is required for a gypsum panelproduct assembly, the details of construction shall be inaccordance with the acoustical test report of an assembly thathas met the required acoustical value(s).1.3.1 This specification shall govern where it is morestringent (size or thickness of framing and size and
6、 spacing offasteners) than the sound-rated construction.1.4 Where resistance to racking loads or shear is requiredfor a gypsum panel product assembly, the details of construc-tion shall be in accordance with the racking or shear test reportof an assembly that has met the required racking or shearval
7、ue(s).1.4.1 This specification shall govern where it is morestringent (size or thickness of framing and size and spacing offasteners) than the racking or shear-tested construction.1.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematica
8、lconversions to SI units that are provided for information onlyand are not considered standard.1.6 The text of this standard references notes which provideexplanatory material. These notes shall not be considered asrequirements of the standard.1.7 This standard does not purport to address all of the
9、safety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to
10、Gypsum and Related BuildingMaterials and SystemsC954 Specification for Steel Drill Screws for theApplicationof Gypsum Panel Products or Metal Plaster Bases to SteelStuds from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) inThicknessC955 Specification for Load-Bearing (Transverse and Axial)Steel Studs,
11、Runners (Tracks), and Bracing or Bridgingfor Screw Application of Gypsum Panel Products andMetal Plaster BasesC1002 Specification for Steel Self-Piercing Tapping Screwsfor the Application of Gypsum Panel Products or MetalPlaster Bases to Wood Studs or Steel StudsC1007 Specification for Installation
12、of Load Bearing (Trans-verse and Axial) Steel Studs and Related AccessoriesC1063 Specification for Installation of Lathing and Furringto Receive Interior and Exterior Portland Cement-BasedPlasterC1177/C1177M Specification for Glass Mat Gypsum Sub-strate for Use as SheathingC1278/C1278M Specification
13、 for Fiber-Reinforced GypsumPanelC1396/C1396M Specification for Gypsum Board2.2 U.S. Department of Commerce Publication:PS20 American Softwood Lumber Standard31This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct res
14、ponsibilityof Subcommittee C11.03 on Specifications for theApplication of Gypsum and OtherProducts in Assemblies.Current edition approved Nov. 15, 2013. Published January 2014. Originallyapproved in 1994. Last previous edition approved in 2013 as C1280 13. DOI:10.1520/C1280-13A.2For referenced ASTM
15、standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbin
16、s Ave., Philadelphia, PA 19111-5094, Attn: NPODS.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerm
17、inology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 exterior cladding, na permanent material or systemthat impedes the transmission of environmental elements to thegypsum panel products used as sheathing.3.2.2 fastener, nnails, staples, or screws used for applica-tion of the gypsum
18、panel product.3.2.3 framing member, nstuds, headers, bracing, andblocking that serve to receive the gypsum panel product.3.2.4 horizontal application, na synonym for perpendicu-lar application.3.2.5 parallel application, ngypsum panel product ap-plied with the factory edges parallel to the framing m
19、embers;a synonym for vertical application.3.2.6 perpendicular application, ngypsum panel productapplied 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 thisspecification, such as a building code, project
20、 specification,contract, or purchase order.3.2.8 specified, adjpertaining to a mandatory requirementof this specification or a referenced requirement.3.2.9 specify, vto mandate by an obligation of this stan-dard or a referenced document.3.2.10 vertical application, nsynonym for parallel appli-cation
21、.3.2.11 weather-resistive barrier, na temporarily exposedprotective membrane that is intended to impede the penetrationof environmental elements until the installation of a permanentexterior cladding.4. Exposure After Installation4.1 Gypsum sheathing board is a paper faced substrate thatshall be cov
22、ered by an exterior cladding or other weather-resistive barrier and is not intended for long-term exposure. Itshall not be exposed to the elements for more than 30 days afterit has been installed. Gypsum sheathing shall be covered witha weather-resistive barrier within 30 days if the exposure timewi
23、ll be more than 30 days.NOTE 1Some building codes require an additional weather-resistivebarrier. The exterior face paper of the sheathing shall be dry prior toapplication of the additional weather-resistive barrier.4.2 Water-Resistant Exterior Fiber-Reinforced GypsumSheathing Panels provide a subst
24、rate that shall be covered byan exterior cladding or other weather-resistive barrier and isnot intended for long-term exposure. Refer to manufacturersrecommendations for maximum exposure time. Water-Resistant Exterior Fiber-Reinforced Gypsum Sheathing Panelsshall be covered with a water-resistive ba
25、rrier if exposure timeis expected to exceed the manufacturers recommended maxi-mum exposure time.4.2.1 Gypsum sheathing used in building construction shallbe not less than 8 in. (200 mm) from the finish grade in fullyweather and water protected siding systems and in properlydrained and ventilated cr
26、awl spaces. All cut edges shall beprotected from water and moisture. The grounds surface in thecrawl space shall be covered with a vapor retarder.4.3 Glass Mat Gypsum Substrate for Use as Sheathingprovides a substrate that shall be covered by an exteriorcladding or other weather-resistive barrier an
27、d is not intendedfor long-term exposure. Refer to manufacturers recommenda-tions for maximum exposure time. Glass Mat Gypsum Sub-strate for Use as Sheathing shall be covered with a water-resistive barrier if exposure time is expected to exceed themanufacturers recommended maximum exposure time.5. Ma
28、terials 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 fireresistance than regular gypsum sheathing as defined in Speci-fication C1396/C1396M.5.2 Water-Resistant Exterior
29、 Fiber-Reinforced GypsumSheathing PanelsSpecification C1278/C1278M, Section 8.5.2.1 Type X (Special Fire-Resistant) Water-Resistant Exte-rior Fiber-Reinforced Gypsum Sheathing PanelsWater-resistant exterior fiber-reinforced gypsum sheathing panels thatprovide a greater degree of fire resistance than
30、 regular water-resistant fiber-reinforced gypsum sheathing panels as definedin Specification C1278/C1278M.5.3 Glass Mat Gypsum Substrate for Use as SheathingSpecification C1177/C1177M.5.3.1 Type X Glass Mat Gypsum Substrate for Use asSheathingGlass Mat Gypsum Substrate for Use as Sheathingthat provi
31、des a greater degree of fire resistance than regularGlass Mat Gypsum Substrate for Use as Sheathing as definedin Specification C1177/C1177M.5.4 FastenersFasteners shall be as described in 5.4.1through 5.4.3. The fastener length shall be not less than thatspecified in Table 1.5.4.1 NailsNails shall b
32、e not less than 12-gauge galva-nized,716-in. (11-mm) diameter head.5.4.2 Screws:5.4.2.1 Screws for fastening gypsum panel products towood framing members, and to steel framing members lessTABLE 1 Minimum Fastener LengthsFramingTypeFastenerTypeSheathingThickness, in. (mm)MinimumFastenerLength, in. (m
33、m)Wood Nails12 (12.7) 1-12 (38)58 (15.9) 1-34 (45)Screws12 (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 Screws12 (12.7) 1 (25)58 (15.9) 1-14 (32)AStaples shall be used to apply only Gypsum Sheathing board meeting Specifi-cation C1396/C1396M.C1280 13a2than 0
34、.033 in. (0.84-mm) in thickness, shall meet the require-ments of Specification C1002.5.4.2.2 Screws for fastening gypsum panel products to steelframing members from 0.033 to 0.112-in. (0.84 to 2.84-mm) inthickness shall meet the requirements of Specification C954.5.4.2.3 Trim-head screws shall not b
35、e permitted for theattachment of gypsum panel products.5.4.2.4 Screws for fastening self-furred metal lath overgypsum panel products as described in 8.2.7 shall be asspecified in Specification C1063.5.4.3 StaplesStaples shall be of galvanized steel, not lessthan 16-gauge,716-in. (11-mm) wide crown o
36、utside measure-ment. Legs shall have divergent points.5.5 Framing Members:5.5.1 Wood FramingWood framing members shall con-form to PS20.5.5.2 Steel FramingLoad-bearing steel framing shall meetthe requirements of Specification C955.6. Substrate, Surface Preparation6.1 The maximum spacing for framing
37、members for gyp-sum panel products shall be not more than 24-in. (610-mm) oncenter on walls.6.1.1 Wood framing shall be straight and true, attachedsecurely following accepted engineering practices and asrequired for the intended design. The surfaces to whichabutting edges or ends of gypsum panel pro
38、ducts are to beattached shall be not less than 112-in. (38-mm) wide. Thebearing surface shall be not less than34-in. (19-mm) forinternal corners or angles.6.1.2 Load-bearing metal framing members shall be of theproper size and design for their intended use and shall beinstalled in accordance with Sp
39、ecification C1007.7. Framing Alignment7.1 Framing members shall be installed so that the surfacewill be in an even plane, unless otherwise specified, after thegypsum panel products have been applied.8. Cutting and Application of Gypsum Panel Products8.1 Cutting Gypsum Panel Products:8.1.1 The gypsum
40、 panel products shall be cut by scoring andbreaking or by sawing, working from the face side. The face offaced gypsum panel products shall be cut with a sharp knife orother suitable tool when cutting by scoring. The gypsum panelproduct shall be broken by snapping the gypsum panel productin the rever
41、se direction or by cutting the facer on the backsurface with a knife or suitable tool.8.1.2 The cut edges and ends of gypsum panel productsshall be trimmed to obtain neat fitting joints when installed.8.1.3 Holes for pipes, fixtures, or other small openings shallbe scored on the face before removing
42、 the cutout with a saw orspecial tool designed for this purpose.8.1.4 Where gypsum panel products meet projectingsurfaces, the gypsum panel product shall be scribed and cutneatly.8.2 Application of Gypsum Panel Products:8.2.1 Gypsum panel products shall be fitted snugly aroundall window and door ope
43、nings.8.2.1.1 Gypsum panel product joints shall be offset a mini-mum of 4-in. (100-mm) from the edge of any opening.8.2.1.2 Gypsum panel products shall be flashed at openingsso that water intrusion will not contact the gypsum panelproduct.8.2.2 All vertical end and edge joints shall abut over thecen
44、ters of framing members and shall be offset a minimum ofone framing space between adjacent rows of gypsum panelproducts.8.2.3 Control Joints:8.2.3.1 Control joints shall be provided in wall runs exceed-ing 30-ft (9 m) in length. The distance between control jointsshall be not more than 30-ft (9 m).8
45、.2.3.2 Control joints shall be installed in walls whereverthere is a building construction joint or where required.8.2.3.3 The location of the control joints shall be as requiredby either the building design or the exterior cladding specified.8.2.3.4 Control joints, other accessories, and metal plas
46、terbase shall be fastened through gypsum panel products toframing members.8.2.4 Gypsum panel products, 4-ft (1220-mm) wide, shallbe applied either parallel or perpendicular to framing members.8.2.4.1 Square edge gypsum panel products applied perpen-dicular to framing members shall be covered with a
47、water-resistive barrier, or horizontal joints shall be sealed.8.2.5 Tongue and groove gypsum panel products shall beapplied with the long dimension perpendicular to framingmembers, with the grooved edges down, interlocking thetongue of the gypsum panel product below without forcing.8.2.6 Application
48、 of Gypsum Panel ProductsFastenersshall be spaced not more than 8-in. (200-mm) on center alongvertical ends or edges and intermediate supports. The length offasteners shall be as indicated in Table 1.8.2.6.1 Gypsum sheathing board shall be applied with nails,screws or staples. Water-Resistant Exteri
49、or Fiber-ReinforcedGypsum Sheathing Panels and Glass Mat Gypsum Substratefor Use as Sheathing shall be applied with nails or screws.8.2.6.2 Fasteners shall be located not less than38-in. (10-mm) from the ends and edges of the gypsum panel product.8.2.6.3 Gypsum panel products shall be held tight againstthe framing when driving fasteners.8.2.6.4 Fasteners shall be driven so that the heads are at orslightly below the surface of the gypsum panel product withoutbreaking the face paper or glass mat, or fracturing the core.8.2.6.5 Screws s
