All supporting walls must be built from homogeneous material, since each section of the carrier wall should have the same technical characteristics. If you do not undergo this simple requirement, then over time the wall will unevenly perceive existing loads and as a result, cracks and cracks may appear. In the supporting walls, it is unacceptable to use not only different building materials, such as expanded clay blocks, bricks, blocks with hollow blocks, and even prohibited the use of the same type of materials, but with different characteristics. Approximately, it is impossible to use blocks of porous ceramics with unequal strength indicators – 10, 15 MPa in one load -bearing wall. By the way, before starting repairs with your own hands, visit the construction portal and read useful information about repair there.
It is also impossible to use materials with different indicators of heat transfer resistance during construction, otherwise wet spots appear on the plaster, which will dry out for a long time and can become an ideal source for the reproduction of fungi. When choosing a solution for masonry, you must pay attention to its brand. You can not use a solution with a strength higher than that of the wall material. Mostly developers use solutions of brands M50 or M75.