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September/October 2009

Nonmetallic Plaster Bases

The use of nonmetallic plaster bases (lath) is growing in the construction industry, and minimum consensus standards are being set for installation, test methods and performance requirements. A task group within Subcommittee C11.02 on Specifications and Test Methods for Accessories and Related Products is currently developing three lath standards:

  • WK24554, Test Method for Nonmetallic Plaster Bases (Lath) Used with Portland Cement Based Plaster;
  • WK24555, Specification for Installation of Nonmetallic Plaster Bases (Lath) Used with Portland Cement Based Plaster; and
  • WK24556, Specification for Nonmetallic Plaster Bases (Lath) Used with Portland Cement Based Plaster.

Subcommittee C11.02 is part of ASTM International Committee C11 on Gypsum and Related Building Materials and Systems.

According to William Egan, manager, engineering and development, BASF Wall Systems, and a C11 member, each of the proposed new standards will help assure that nonmetallic lath products perform adequately, provide a means for design professionals to generically specify products and guide contractors in installation.

“We expect that the proposed standards will be widely used and accepted after they’ve been approved,” says Egan. “However, they’re probably of most interest to design professionals, contractors, building owners and building officials.”

All interested parties are invited to contribute to the ongoing development of these three work items. “It would be particularly helpful to have input and participation from additional manufacturers of nonmetallic lath that currently do not participate in the ASTM standards development process,” says Egan.


Technical Information: William Egan, BASF Wall Systems, Jacksonville, Fla.

Phone: 904-996-6115

ASTM Staff: Thomas O’Toole

Phone: 610-832-9739