ASTM C846-16(R2021) pdf free download

ASTM C846-16(R2021) pdf free download.Standard Practice for Application of Cellulosic Fiber Insulating Board for Wall Sheathing
1. Scope
1.1 This practice covers the requirements for storing, handling, and application of cellulosic fiber insulating board products. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 exterior finish—the shingle, lap, or panel siding material, masonry veneer, or stucco applied over the sheathing as a protective, decorative exterior finish of the building. 3.1.2 fasteners—nails, staples, or screws used for applica- tion of the sheathing. 3.1.3 framing members—those portions of the studs, headers, bracing, and blocking which serve to receive the sheathing. Framing members can be wood or metal. 3.1.4 regular wall sheathing—described in Definitions D1554 and Specification C208. It is 4 ft (1.22 m) wide with square-cut edges on all sides and 1 ⁄ 2 in. (12.7 mm) in thickness. 3.1.5 structural wall sheathing—described in Definitions D1554 and Specification C208. When installed in accordance with Section 7, it is considered a structural sheathing providing adequate racking resistance. It is 4 ft (1.22 m) wide and 1 ⁄ 2 in. (12.7 mm) or 25 ⁄ 32 in. (19.8 mm) in thickness with square-cut edges on all sides. 3.1.6 vertical application—sheathing applied with the long edges parallel to the studs.
4. Significance and Use
4.1 This standard provides recommendations for the instal- lation in a safe and effective manner. Actual conditions may vary greatly, and additional care should be taken to ensure a safe and effective installation. 4.2 This standard presents requirements that are general in nature and considered practical. They are not intended as specific recommendations. The user should consult the manu- facturer for recommended application methods and procedures. 4.3 This standard does not address the applicability of regulatory limitations. This is the responsibility of the user.
7. Application (see Table 2)
7.1 Vertical Application (see Fig. 1)—Apply 4-ft (1.22-m) wide by 1 ⁄ 2 -in. (12.7-mm) or by 25 ⁄ 32 -in. (19.8-mm) sheathing vertically with long edges parallel to the vertical studs. Center all joints over the framing members with a 1 ⁄ 8 -in. (3.18-mm) gap between edges. Leave a 1 ⁄ 8 -in. gap at doors, windows, and horizontal joints. Sheathing should extend from sill to plate. If not, headers for adequate nailing should be provided at all horizontal joints. Apply fasteners for 1 ⁄ 2 -in. or 25 ⁄ 32 -in. material using roofing nails, common nails (5.2) or staples (5.3) for wood framing and screws (5.4) for metal framing. Apply fasteners to intermediate framing members first. For wood framing, space fasteners 6 in. (152 mm) (Note 1) on center. Apply perimeter fasteners 3 in. (76 mm) (Note 1) on center and a minimum of 3 ⁄ 8 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 not countersink. For metal framing, space the fasteners 5 in. (127 mm) around the perimeter of the sheets and 10 in. (254 mm) into intermediate framing. N OTE 1—When bracing strength is provided separately, intermediate fasteners may be 8 in. (203 mm) on center and perimeter fasteners 4 in. (102 mm) on center.
8. General Recommendations for Installing Exterior Finishes Over Sheathing
8.1 Regular and Structural Wall Sheathing—Fasten furring strips, stucco bases, etc., through the sheathing to the framing. 8.1.1 Horizontal Lap Siding—Apply directly over the sheathing and fasten to each stud. Nails must be long enough to penetrate the wood framing members at least 1 in.