ASTM C1325-99 - 10.11.1999
 
1. Scope

1.1 This specification covers fiber-mat reinforced cement substrate sheets 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 in internal wet and dry areas.

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 C220); non-asbestos fiber cement flat sheets for exterior applications such as claddings, facades, curtain walls, and soffits (Specification C1185); gypsum backing board and coreboard (Specification C442); water-resistant gypsum backing board (Specification C630); glass mat gypsum backing board (Specification C1178); particle boards (Definitions D1554); and discrete non-asbestos fiber cement interior substrate sheets (Specification C1288).

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.

 
2. Referenced Documents

C1154-25

Standard Terminology for Fiber-Reinforced Cement Products

C1535-05(2023)

Standard Practice for Application of Exterior Insulation and Finish Systems Class PI

D1037-12(2020)

Standard Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials

D1554-10(2023)

Standard Terminology Relating to Wood-Base Fiber and Particle Panel Materials

D2394-17(2022)

Standard Test Methods for Simulated Service Testing of Wood and Wood-Based Finish Flooring

E84-26a

Standard Test Method for Surface Burning Characteristics of Building Materials (Includes all amendments and changes 4/15/2026).

G21-15(2021)e1

Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi (Includes all amendments and changes 6/22/2021).

G22-23

Standard Practice for Determining Resistance of Plastics to Bacteria

A118.1

Specification for Dry-Set Portland Cement Mortar

C1516-05(2023)

Standard Practice for Application of Direct-Applied Exterior Finish Systems

A118.4

Specification for Latex-Portland Cement Mortar

A136.1

Standard for Organic Adhesives for Installation of Ceramic Tile

C473-24

Standard Test Methods for Physical Testing of Gypsum Panel Products

C220-91(1999)

Standard Specification for Flat Asbestos-Cement Sheets

C666/C666M-26

Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing

C947-03(2023)

Standard Test Method for Flexural Properties of Thin-Section Glass-Fiber-Reinforced Concrete (Using Simple Beam With Third-Point Loading)

C1397-25

Standard Practice for Application of Class PB Exterior Insulation and Finish Systems (EIFS) and EIFS with Drainage

C1178/C1178M-24

Standard Specification for Coated Glass Mat Water-Resistant Gypsum Backing Panel

C1185-23

Standard Test Methods for Sampling and Testing Fiber-Cement Flat Sheet, Roofing and Siding Shingles, and Clapboards

C1186-26

Standard Specification for Flat Fiber-Cement Sheets

C1288-23

Standard Specification for Fiber-Cement Interior Substrate Sheets

C1396/C1396M-24

Standard Specification for Gypsum Board