FIELD: manufacture of building materials. SUBSTANCE: invention relates to building materials, which are applicable in mounting of fibrous basalt plates as heat insulation of outside walls in cottage and many- storeyed construction, for joining reinforcing and facing materials, and also as sealing and repairing mixes. Composition contains polymer material, modifying additive, and dispersing and dissolving agent. Polymer material is composed of butyl rubber-based blend and natural or synthetic polyisoprene rubber-based blend. EFFECT: extended application area. 6 cl, 2 tbl, 2 ex
