1、Designation: C846 16Standard Practice forApplication of Cellulosic Fiber Insulating Board for WallSheathing1This standard is issued under the fixed designation C846; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the requirements for storing,handling, and application of cellulosic fiber insulating boardproducts.1.
3、2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associ
4、ated 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:2C208 Specification for Cellulosic Fiber Insulating BoardD15
5、54 Terminology Relating to Wood-Base Fiber and Par-ticle Panel Materials2.2 Federal Specifications:FF-N-105-B with Interim Amendment 4 Nails, Brads,Staples and Spikes: Wire Cut and Wrought3UU-B-790-A Building Paper, Vegetable Fiber: (Kraft,Waterproofed, Water Repellent and Fire Resistant)33. Termino
6、logy3.1 Definitions of Terms Specific to This Standard:3.1.1 exterior finishthe shingle, lap, or panel sidingmaterial, masonry veneer, or stucco applied over the sheathingas a protective, decorative exterior finish of the building.3.1.2 fastenersnails, staples, or screws used for applica-tion of the
7、 sheathing.3.1.3 framing membersthose portions of the studs,headers, bracing, and blocking which serve to receive thesheathing. Framing members can be wood or metal.3.1.4 regular wall sheathingdescribed in DefinitionsD1554 and Specification C208. It is 4 ft (1.22 m) wide withsquare-cut edges on all
8、sides and12 in. (12.7 mm) in thickness.3.1.5 structural wall sheathingdescribed in DefinitionsD1554 and Specification C208. When installed in accordancewith Section 7, it is considered a structural sheathing providingadequate racking resistance. It is 4 ft (1.22 m) wide and12 in.(12.7 mm) or2532 in.
9、 (19.8 mm) in thickness with square-cutedges on all sides.3.1.6 vertical applicationsheathing applied with the longedges parallel to the studs.4. Significance and Use4.1 This standard provides recommendations for the instal-lation in a safe and effective manner. Actual conditions mayvary greatly, an
10、d additional care should be taken to ensure asafe and effective installation.4.2 This standard presents requirements that are general innature and considered practical. They are not intended asspecific recommendations. The user should consult the manu-facturer for recommended application methods and
11、 procedures.4.3 This standard does not address the applicability ofregulatory limitations. This is the responsibility of the user.5. Materials5.1 Sheathing shall conform to Specification C208.5.2 Nails for application of sheathing to wood framing shallconform to Federal Specification FF-N-105-B, inc
12、luding In-terim Amendment 4, and shall be in accordance with Table 1.1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.40 on InsulationSystems.Current edition approved Sept. 1, 2016. Published September 2016. Orig
13、inallyapproved in 1976. Last previous edition approved in 2009 as C846 94 (2009).DOI: 10.1520/C0846-16.2For referenced ASTM 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
14、 Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Unit
15、ed States15.3 Staples for application of12-in. and2532-in. sheathing towood framing shall meet the following requirements:Gage 16Thickness, min, in. (mm) 0.057 (1.45)Width, min, in. (mm) 0.063 (1.59)Length, min, in. (mm) 112 (38.1)Crown, min, in. (mm)716 (11.1)Points chisel pointdivergent pointdiver
16、gent chisel point5.4 Screws for application of12-in. and2532-in. sheathing on14-gage (0.075-in.) (1.90-mm) to 20-gage (0.036-in.)(0.91mm) steel studs shall meet the following requirements:Head type bugle headHead diameter, min, in. (mm)516 (7.94)Length, min, in. (mm) 114 (31.8)Major diameter, in. (m
17、m)964 (3.57)Minor diameter, in. (mm)764 (2.78)Point drill point5.5 Framing Members shall be of such size and quality as tobe structurally adequate for the type of building being con-structed.5.5.1 Stud spacing shall be 16 in. (0.41 m) or 24 in. (0.61 m)on center depending on code requirements.6. Sto
18、rage6.1 Sheathing shall be stored flat, and supported and pro-tected from direct contact with the ground. Sheathing shall notbe stored in a heated warehouse and shall be allowed to cometo equilibrium at job site conditions prior to application.Sheathing should be protected from rain prior to install
19、ation.7. Application (see Table 2)7.1 Vertical Application (see Fig. 1)Apply 4-ft (1.22-m)wide by12-in. (12.7-mm) or by2532-in. (19.8-mm) sheathingvertically with long edges parallel to the vertical studs. Centerall joints over the framing members with a18-in. (3.18-mm)gap between edges. Leave a18-i
20、n. gap at doors, windows, andhorizontal joints. Sheathing should extend from sill to plate. Ifnot, headers for adequate nailing should be provided at allhorizontal joints. Apply fasteners for12-in. or2532-in. materialusing roofing nails, common nails (5.2) or staples (5.3) forwood framing and screws
21、 (5.4) for metal framing. Applyfasteners to intermediate framing members first. For woodframing, space fasteners 6 in. (152 mm) (Note 1) on center.Apply perimeter fasteners 3 in. (76 mm) (Note 1) on center anda minimum of38 in. (9.5 mm) from the edge. Apply staples(5.3) vertically with the crown par
22、allel to the framing member.Drive fasteners flush with the sheathing surface, but do notcountersink. For metal framing, space the fasteners 5 in. (127mm) around the perimeter of the sheets and 10 in. (254 mm)into intermediate framing.NOTE 1When bracing strength is provided separately, intermediatefa
23、steners may be 8 in. (203 mm) on center and perimeter fasteners 4 in.(102 mm) on center.8. General Recommendations for Installing ExteriorFinishes Over Sheathing8.1 Regular and Structural Wall SheathingFasten furringstrips, stucco bases, etc., through the sheathing to the framing.8.1.1 Horizontal La
24、p SidingApply directly over thesheathing and fasten to each stud. Nails must be long enoughto penetrate the wood framing members at least 1 in. (25.4 mm)TABLE 1 Nail DimensionsSheathing Thickness,in. (mm)Galvanized SteelRoofing NailsCommonNailsGage 11 1112 (6d)Length, min, in. (mm) 112 (38.1) 2 (50.
25、8)12 (12.7) Head diameter, min, in. (mm)716 (11.1)1764 (6.75)Wire diameter, min, in. (mm) 0.120 (3.06)A0.1130 (2.87)Gage 11 1014 (8d)Length, min, in. (mm) 134 (44.5) 212 (63.5)2532 (19.8) Head diameter, min, in. (mm)716 (11.1)932 (7.14)Wire diameter, min, in. (mm) 0.120 (3.06)A0.131 (3.33)APrior to
26、galvanizing.TABLE 2 Fastener SpacingSheathing FramingFastener Spacing, in. (mm) on CenterIntermediateFramingPerimeter Framing12 or2532 in.by4ftby8ftor9ft(12.7or19.8mmby1.22mby2.44mor2.74m)wood 6 (152) 3 (76)12 or2532 in.by4ftby8ftor9ft(19.8or12.7mmby1.22mby2.44mor2.74m)metal 10 (254) 5 (127)With sep
27、arate bracing:12 in.by4ftby8ftor9ft(12.7mmby1.22mby2.44mor2.74m)wood 8 (203) 4 (102)2532 in.by4ftby8ftor9ft(19.8mmby1.22mby2.44mor2.74m)C846 162in accordance with the manufacturers recommendations. Alljoints of siding should fall on the center of framing members.8.1.2 Vertical Wood Board SidingFaste
28、n vertical sidingand batten strips (if used) to horizontal members spaced notFastener SpacingNails,in. (mm)Staples,in. (mm)Screws,in. (mm)AABA3 (76.20)6 (152.40)3 (76.20)6 (152.40)5 (127.00)10 (254.00)AA = spacing on edgesB = spacing in fieldFIG. 1 Vertical ApplicationC846 163over 24 in. (0.61 m) on
29、 center. Nails must penetrate the woodblocking not less than 1 in. (25.4 mm).8.1.3 Mineral Fiber ShinglesUse38-in. (9.5-mm) by 312-in. (88.9-mm) or larger wood furring strips as nailing basesecured to each stud. Nails must be long enough to penetrate 1in. (25.4 mm) into the wood framing in accordanc
30、e with themanufacturers recommendations.8.1.4 Plywood and Hardboard Panel and SidingApplydirectly over the sheathing and fasten to each framing member.Nails must be long enough to penetrate the wood framingmembers at least 1 in. (25.4 mm) in accordance with themanufacturers recommendations.8.1.5 Woo
31、d ShinglesApply furring strips (nominal 1 by 2in.) or larger horizontally over the sheathing and secure to eachstud. Nails must be long enough to penetrate at least 1 in. (25.4mm) into the wood framing. Space the furring strips the samedistance, center to center, as the weather exposure of theshingl
32、es. Nail shingles to the furring strips in accordance withthe shingle manufacturers specifications.8.1.6 StuccoCover the entire sheathing surface with acontinuous layer of asphalt-impregnated, water-repellent paperweighing at least 10 lb/100 ft2(0.49 kg/m2). An alternative isClass D building paper m
33、eeting Federal Specification UU-B-790-A or an equivalent weather resistant barrier. Do not use avapor barrier such as coated roofing membrane. Head and sidelaps should be at least 4 in. (101.6 mm). Self-furring metal lathstucco bases (3.4 lb/yd2) (1.84 kg/m2) or equivalent may beapplied directly ove
34、r the building paper. If necessary, use stripsof wood lath to make certain that there is at least38 in. (9.5mm) of clear space between the stucco base and the sheathing.Non-furring stucco bases such as diamond mesh metal lathshould be nailed to nominal 1 by 2-in. wood furring stripsapplied verticall
35、y over the studs. All nailing of both furringstrips and stucco base should be done with nails or staples thatare long enough to extend through the sheathing and at least 1in. (25.4 mm) into the wood framing.8.1.7 Masonry VeneerAttach metal ties for masonry ve-neer over the sheathing with nails that
36、penetrate at least34 in. (19.0 mm) into the wood framing members. At least 1 in.(25.4 mm) of clear space should be left between the sheathingand the back of the veneer.9. Keywords9.1 cellulosic fiberboard; cellulosic fiber insulating board;fiberboard; insulating board; regular wall sheathing; struct
37、uralwall sheathing; wall sheathingASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risko
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