Can someone provide a definition for skim coat, please?
Here is the GA-214-07 definition:
“Either a thin coat of joint compound trowel applied, or a material manufactured especially for this purpose and applied in accordance with manufacturers recommendations, over the entire surface.”
The document discusses skim coats for Level 5 finishes in some detail. (Note that GA-214 has been updated since the 2007 version quoted; the current version is available on the Gypsum Association website)
Sorry. I missed your topic title referring to plaster, not gypsum. Here is the TSIB definition from the Plaster Manual:
SKIM COAT: a coat of material, base coat or finish material, applied to improve, smooth out or level a surface. A stucco finish coat applied directly to masonry or concrete.
See tsib.org
Thanks George, I forgot about TSIB, an excellent reference, ASTM C 926 definition was not working for me: “3.2.9.9 skim coata thin finish coat applied to an existing plaster surface or other substrate to improve appearance.” My client was confused, she thought the skim coat was part of the standard number of coats for stucco application over a solid substrate.