hardwall
nounEtymology From hard + wall.
1
A strong grade of gypsum plaster, used primarily as an undercoat.
- Keen's cement finish bonds best to a base of strongly gauged Keen's cement mortar, but the addition of lime putty increases its bonding qualities when applied over a hardwall, lime mortar, or Portland cement base coat.1923, Trade and Industrial Series - Issues 1-7, page 43:
- Hardwall-grade calcined gypsum ( +90 percent Casoy ) passes over a vibrating scrcen fitted with a 50-mesh screen;1950, Information Circular - Issues 7555-7568, page 15:
2 more examples
- When EPA promulgated its final AHERA regulations on October 30, 1987, the regulations did not mention sheetrock, drywall, gypsum wallboard or hardwall plaster as ACM.1992, United States Congress House Committee on Government Operations: Environment, Energy, and Natural Resources Subcommittee, EPA's Administration of the Asbestos in Schools Program, page 157:
- Hardwall is similar to browning except that it offers a higher impact resistance and quicker drying surface.2010, DIY Doctor, Master Basic DIY: Teach Yourself: