The strength of plaster mix gets reduced with the reduction in the fineness modulus of sand. For single coat plaster the fineness modulus of sand should be as far as possible 1.5.This Contractor shall make sample panels at the building at least 4' x 4' of each type of plasterwork. Allowable Tolerances: For flat surfaces, do not exceed ' to 10'-0' for bow, warp, plumb or level, including surfaces to receive applied finishes (tile, etc.). engineers, designers, specification writers, contractors, plasterers, and public authorities can use this guide for familiarization with the plastering processes. Portland cement-based plaster may be applied to flat, curved, or rusticated bases made from. 5) Types M, S, N Portland cementASTM C150 (ref. Cement Plaster: Perform work in accordance with ASTM C926. Portland cement-based plaster is a versatile and weather-resistant surfacing material. Portland cement-based plaster may be applied to flat, curved, or rusticated bases made from concrete, clay masonry, concrete masonry, woven or welded-wire mesh, or expanded me tal lath. 4) Types IP, IP (M), IS, IS (M), and their air-entrained counterparts IP-A, IP (M)-A, IS-A, IS (M)-A Masonry cementASTM C91 (ref. ASTM C 1063 - Standard Specification for Installation of Lathing and Furring for Portland Cement Plaster. Portland cement-based plaster is a versatile and weather-resistant surfacing material. Where two or three coat plasters are adopted, as far as possible the mix for the under coats should contain coarse sand (conforming to grading zone 2) having fineness modulus not less than 2.0 Cement should comply to one of the following product specifications: Blended hydraulic cement ASTM C595 (ref.Very rough surface both internal and externalįat lime and fine sand or marble dust in equal proportions A list of specifications for mixes suitable for various situations, which cover single-coat, two-coat and three-coat work is given in the table below.
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