The additives of polymers of domestic and foreign production used in compositions of dry construction mixes are given. The need of expansion the range of polymer additives produced in Russia for competitive production is proved. It is shown that use of masonry mortars with additives of domestic water-soluble polymers (methyl cellulose, oxyethylcellulose) in amount of 0.5–1 % prevents softening and cracking of masonry at the junction of bricks, provides high adhesion to stone wall material, increases solidity of masonry. Masonry earing capacity on cement and sand solution with additive of 0.5 % of methyl cellulose increases by 20 % above in comparison with a bricklaying on traditional solution, without polymer additive. The appearance of main cracks in the central compression of the masonry on cement-polymer solution occurs at higher intensities of the breaking load. Studied domestic additives of water-soluble polymers are environmentally friendly products of domestic production. The low percentage of polymer has a positive effect on the water resistance and cost of masonry. The developed masonry mortars can be recommended for buildings and constructions subjected to dynamic effects.