This work contains results of using failed local fine sands for construction plaster matrixes. Plaster mixes of improved technological, physical and mechanical properties were obtained. Using of complex mineral admixtures in construction mortar increases working life up to 5.5 hours, compression capacity – more than 30%, adhesion – up to 20%, decreases ability to delaminate, what widens its use in construction. It was defined that sands (hard and cold aggregate), slag, pumice stone, charcoal (light and warm aggregate) are used as aggregates. The best sand for making the plaster mortar is stream sand. It is the cleanest sand which does not need additional refining, and not decreasing resistibility of the mortar. Beach, ravine and rock sands are usually polluted by salts and clay; they should be washed before use. There are coarse (grain size from 2 to 5 mm), medium (grain size from 0.5 to 2 mm) and fine (grain size up to 0.5 mm) sands. Usually medium sands are used in plaster works, and fine sands in molding plaster for troweling and fine-grained fractures. It was showed that sharp sand is the best. It joins well with binders. Coarse sands are rarely used in plaster works. Usually medium sands are used. Fine sands are used for molding plaster which allows, while trowering, to get fine-grained finish without spackling it for painting. It was discovered that slag sand is obtained by crushing and screening of slag, which was kept in dump at least for 3 months, so all the sulfide impurities that destroy binders and decrease mortar resistibility could be washed out. These sands, being lighter sands, are used in mortar for building plastering and heat insulation. Herein, plaster thickness should not be less than 3 cm.

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