Portland cement plaster (stucco) is a versatile facing material that has stood the test of time in locations throughout the world.
Throughout the discussion of stucco, it is important that one keeps in mind at all times, the differentiation between stucco being applied over a solid, i.e., concrete or block substrate, as compared to a wood or metal stud flexible substrate. There are many reasons for keeping this differentiation in mind, not the least of which is that the stucco over a solid substrate can be applied directly to the substrate, following ASTM C 932, whereas, stucco over frame, metal or wood flexible substrates, must include the requirements of ASTM C 1063, thus adding an entire new standard to the stucco requirements when applying it over the flexible substrate.
• "Portland Cement Plaster (Stucco) Manual" by Portland Cement Association.