1、Designation: C 846 94 (Reapproved 2009)Standard Practice forApplication of Cellulosic Fiber Insulating Board for WallSheathing1This standard is issued under the fixed designation C 846; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, 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. Scope1.1 This practice covers the requirements for storing, han-dling, and application of cellulosic fiber insul
3、ating boardproducts.1.2 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 co
4、ncerns, 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:2C 208 Specification for Cellulosic Fi
5、ber Insulating BoardD 1554 Terminology Relating to Wood-Base Fiber andParticle Panel Materials2.2 Voluntary Product Standard:ANSI/AHA A194.1 Cellulosic Fiberboard32.3 Federal Specifications:FF-N-105-B with Interim Amendment 4 Nails, Brads,Staples and Spikes: Wire Cut and Wrought4UU-B-790-A Building
6、Paper, Vegetable Fiber: (Kraft, Wa-terproofed, Water Repellent and Fire Resistant)43. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 exterior finishthe shingle, lap, or panel siding ma-terial, masonry veneer, or stucco applied over the sheathing asa protective, decorative exteri
7、or finish of the building.3.1.2 fastenersnails, staples, or screws used for applica-tion of the sheathing.3.1.3 framing membersthose portions of the studs, head-ers, bracing, and blocking which serve to receive the sheathing.Framing members can be wood or metal.3.1.4 regular wall sheathingdescribed
8、in DefinitionsD 1554 and Specification C 208. It is 4 ft (1.22 m) wide withsquare-cut edges on all sides and12 in. (12.7 mm) in thickness.3.1.5 structural wall sheathingdescribed in DefinitionsD 1554 and Specification C 208. When installed in accordancewith Section 7, it is considered a structural s
9、heathing providingadequate racking resistance. It is 4 ft (1.22 m) wide and12 in.(12.7 mm) or2532 in. (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 recomm
10、endations for the instal-lation in a safe and effective manner. Actual conditions mayvary greatly, and 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 asspecif
11、ic recommendations. The user should consult the manu-facturer for recommended application methods and 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 ANSI/AHA A194.1 andSpecifi
12、cation C 208.5.2 Nails for application of sheathing to wood framing shallconform to Federal Specification FF-N-105-B, including In-terim Amendment 4, and shall be in accordance with Table 1.5.3 Staples for application of12-in. and2532-in. sheathingto wood framing shall meet the following requirement
13、s:1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.22 on Organic andNonhomogeneous Inorganic Thermal Insulations.Current edition approved April 1, 2009. Published August 2009. Originallyapproved in 1976. Last pre
14、vious edition approved in 2003 as C 846 94 (2003).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 Document Summary page onthe ASTM website.3Available
15、from American Hardboard Assoc., 1210 W. Northwest Highway,Palatine, IL.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Con
16、shohocken, PA 19428-2959, United States.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 pointdivergent chisel point5.4 Screws for application of12-in. and2532-in. sheathingon 14-ga
17、ge (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. (mm)964 (3.57)Minor diameter, in. (mm)764 (2.78)Point drill point5.5 Framing Members
18、 shall be of such size and quality asto be structurally adequate for the type of building beingconstructed.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. Storage6.1 Sheathing shall be stored flat, and supported and pro-tected from direct con
19、tact 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 installation.7. Application (see Table 2)7.1 Vertical Application (see Fig. 1)Apply 4-ft (1
20、.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-in. gap at doors, windows, andhorizontal joints. Sheathing should extend from sill to
21、 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 (5.4) for metal framing. Applyfasteners to intermediate framing members first. For
22、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 parallel to the framing member.Drive fasteners flush with the sheathing surface, but do
23、 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, intermediatefasteners may be 8 in. (203 mm) on center and perimeter fasteners 4 in.(102 mm) on cen
24、ter.8. General Recommendations for Installing ExteriorFinishes Over Sheathing8.1 Regular and Structural Wall Sheathing Fasten furringstrips, stucco bases, etc., through the sheathing to the framing.8.1.1 Horizontal Lap SidingApply directly over thesheathing and fasten to each stud. Nails must be lon
25、g enoughto penetrate the wood framing members at least 1 in. (25.4 mm)in accordance with the manufacturers recommendations. Alljoints of siding should fall on the center of framing members.TABLE 1 Nail DimensionsSheathing Thickness,in. (mm)Galvanized SteelRoofing NailsCommonNailsGage 11 1112 (6d)Len
26、gth, min, in. (mm) 112 (38.1) 2 (50.8)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)
27、 0.120 (3.06)A0.131 (3.33)APrior to 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(19.8or12.7mmby1.22mby2.44mor
28、2.74m)metal 10 (254) 5 (127)With separate bracing:12 in.by4ftby8ftor9ft(12.7mmby1.22mby2.44mor2.74m)wood 8 (203) 4 (102)2532 in.by4ftby8ftor9ft(19.8mmby1.22mby2.44mor2.74m)C 846 94 (2009)28.1.2 Vertical Wood Board SidingFasten vertical sidingand batten strips (if used) to horizontal members spaced n
29、otover 24 in. (0.61 m) on 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
30、wood framing in accordance 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 framingFastener SpacingNails,in. (mm)Staples,in. (mm)Screws,in. (mm)AABA3 (7
31、6.20)6 (152.40)3 (76.20)6 (152.40)5 (127.00)10 (254.00)AA = spacing on edgesB = spacing in fieldFIG. 1 Vertical ApplicationC 846 94 (2009)3members at least 1 in. (25.4 mm) in accordance with themanufacturers recommendations.8.1.5 Wood ShinglesApply furring strips (nominal 1 by 2in.) or larger horizo
32、ntally 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 theshingles. Nail shingles to the furring strips in accordance withthe shing
33、le 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 meeting Federal Specification UU-B-790-A or an equivalent weather re
34、sistant 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 over the building paper. If necessary, use stripsof wood lath to make
35、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 vertically over the studs. All nailing of both furringstrips and stucco base
36、 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 penetrate at least34 in. (19.0 mm) into the wood framing members. A
37、t 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; structuralwall sheathing; wall sheathingASTM International takes no posit
38、ion 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 riskof infringement of such rights, are entirely their own responsibilit
39、y.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM
40、 International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address s
41、hown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 846 94 (2009)4
