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This specification covers non-asbestos fiber-mat reinforced cementitious backer units manufactured to be dimensionally stable and suitable as either an unfinished substrate or as a substrate for decoration such as natural stone or tile on walls, floors, or decks in wet and dry areas. Flat sheets covered by this specification are divided into two types, according to their intended application: type A - sheets are intended for exterior applications as a substrate for other cladding materials, or as an unfinished substrate for decoration such as natural stone, tile, or coatings, and type B - Sheets are intended for covered exterior applications such as soffit areas, or for interior dry or wet area applications as a desired unfinished substrate or an unfinished substrate for decoration such as natural stone or tile, where substrate dimensional stability is required. These products are formed either with or without pressure and cured, either under natural or accelerated conditions, to meet the property requirements. Mechanical and physical properties shall be determined on an uncoated product wherever practical. The flexural strength, density value, and modulus of elasticity value shall be tested to meet the requirements prescribed.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers non-asbestos fiber-mat reinforced cementitious backer units manufactured to be dimensionally stable and suitable as either an unfinished substrate (see Note 1) or as a substrate for decoration such as natural stone or tile on walls, floors, or decks in wet and dry areas. It is also suitable to be used as a substrate in the Application of Class PB Exterior Insulation Finish Systems (Practice C 1397 Note 1—When used as an unfinished substrate, consult the manufacturer's written installation literature for proper application details.
Note 1—When used as an unfinished substrate, consult the manufacturer's written installation literature for proper application details.
1.2 This specification is not applicable to asbestos-cement flat sheets (Specification C 220
1.3 Units—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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C220 Specification for Flat Asbestos-Cement Sheets
C442/C442M Specification for Gypsum Backing Board, Gypsum Coreboard, and Gypsum Shaftliner Board
C473 Test Methods for Physical Testing of Gypsum Panel Products
C630/C630M Specification for Water-Resistant Gypsum Backing Board
C666/C666M Test Method for Resistance of Concrete to Rapid Freezing and Thawing
C947 Test Method for Flexural Properties of Thin-Section Glass-Fiber-Reinforced Concrete (Using Simple Beam With Third-Point Loading)
C1154 Terminology for Non-Asbestos Fiber-Reinforced Cement Products
C1178/C1178M Specification for Coated Glass Mat Water-Resistant Gypsum Backing Panel
C1185 Test Methods for Sampling and Testing Non-Asbestos Fiber-Cement Flat Sheet, Roofing and Siding Shingles, and Clapboards
C1186 Specification for Flat Fiber-Cement Sheets
C1288 Specification for Discrete Non-Asbestos Fiber-Cement Interior Substrate Sheets
C1397 Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage
C1516 Practice for Application of Direct-Applied Exterior Finish Systems
C1535 Practice for Application of Exterior Insulation and Finish Systems Class PI
D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials
D1554 Terminology Relating to Wood-Base Fiber and Particle Panel Materials
D2394 Test Methods for Simulated Service Testing of Wood and Wood-Base Finish Flooring
E84 Test Method for Surface Burning Characteristics of Building Materials
G21 Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi
G22 Practice for Determining Resistance of Plastics to Bacteria
ANSI StandardsA136.1 Standard for Organic Adhesives for Installation of Ceramic Tile
UNSPSC Code 30150000(Exterior finishing materials)