The building materials that are used at construction sites are very diverse and there are a lot of them, we want to choose that it suits us. Since there are a lot of them, but you need to choose the best, there are a number of criteria by which certain building materials choose. The first such characteristic that you need to pay attention to is abrasion, that is, a change in building material in volume and mass. So, before the establishment of any material, it must be checked for abrasion, mainly check the floors, steps on the stairs, sidewalks.















