1、Designation: C 846 94 (Reapproved 2003)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 (e) 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 insu
3、lating boardproducts.1.2 This standard does not purport to address all of thesafety 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 t
4、o use.1.3 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are providedfor information only.2. Referenced Documents2.1 ASTM Standards:C 208 Specification for Cellulosic Fiber Insulating Board2D 1554 Terminology Relating to Wood-Base Fiber andPa
5、rticle Panel Materials32.2 Voluntary Product Standard:ANSI/AHA A194.1 Cellulosic Fiberboard42.3 Federal Specifications:FF-N-105-B with Interim Amendment 4 Nails, Brads,Staples and Spikes: Wire Cut and Wrought5UU-B-790-A Building Paper, Vegetable Fiber: (Kraft, Wa-terproofed, Water Repellent and Fire
6、 Resistant)53. 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 exterior finish of the building.3.1.2 fastenersnails, staples, or screws used
7、 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 in DefinitionsD 1554 and Specification C 208. It is 4 ft (1.22 m) wide
8、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 sheathing providingadequate racking resistance. It is 4 ft (1.22 m) wide
9、 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 recommendations for the instal-lation in a safe and effective manner. Actual
10、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 asspecific recommendations. The user should consult the manu-facturer for recom
11、mended 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 andSpecification C 208.5.2 Nails for application of sheathing to wood framing sha
12、llconform 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 requirements:1This practice is under the jurisdiction of ASTM Committee C16 on The
13、rmalInsulation and is the direct responsibility of Subcommittee C16.22 on Organic andNonhomogeneous Inorganic Thermal Insulations.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1976. Last previous edition approved in 1999 as C 846 94 (1999).2Annual Book of ASTM
14、Standards, Vol 04.06.3Annual Book of ASTM Standards, Vol 04.10.4Available from American Hardboard Assoc., 1210 W. Northwest Highway,Palatine, IL.5Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM Internat
15、ional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, 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
16、 application of12-in. and2532-in. sheathingon 14-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. (mm)964 (3.57)Minor diameter, in.
17、 (mm)764 (2.78)Point drill point5.5 Framing Members 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
18、 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 installation.7. Application (see Table 2
19、)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-in. gap at doors, windows, andhori
20、zontal 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 (5.4) for metal framing. Applyfa
21、steners 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 parallel to the framing member.Drive
22、 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, intermediatefasteners may be 8 in. (203 mm) on
23、center and perimeter fasteners 4 in.(102 mm) on center.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 thes
24、heathing and fasten to each stud. Nails must be long 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)Galvanize
25、d SteelRoofing NailsCommonNailsGage 11 1112 (6d)Length, 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. (
26、mm)716 (11.1)932 (7.14)Wire diameter, min, in. (mm) 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(12.7 or 19.8 mm by 1.22 m by 2.44 m or 2.74 m)wood 6 (152)
27、3 (76)12 or2532 in.by4ftby8ftor9ft(19.8 or 12.7 mm by 1.22 m by 2.44 m or 2.74 m)metal 10 (254) 5 (127)With separate bracing:12 in.by4ftby8ftor9ft(12.7 mm by 1.22 m by 2.44 m or 2.74 m)wood 8 (203) 4 (102)2532 in.by4ftby8ftor9ft(19.8 mm by 1.22 m by 2.44 m or 2.74 m)C 846 94 (2003)28.1.2 Vertical Wo
28、od Board SidingFasten vertical sidingand batten strips (if used) to horizontal members spaced notover 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 na
29、iling basesecured to each stud. Nails must be long enough to penetrate 1in. (25.4 mm) into the 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
30、penetrate the wood framingFastener 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 ApplicationC 846 94 (2003)3members at least 1 in. (25.4 mm) in accordance with themanufacture
31、rs recommendations.8.1.5 Wood 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 w
32、eather exposure of theshingles. 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 alternativ
33、e isClass D building paper meeting 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 equivalen
34、t may beapplied directly over 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 fur
35、ring stripsapplied vertically 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 th
36、e sheathing with nails that 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; re
37、gular wall sheathing; structuralwall 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
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40、ir hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown 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 (2003)4
