Abstract: The invention relates to a procedure for the production of insulating building units from plastic and/or rubber waste containing metal, in the course of which procedure the plastic and/or rubber waste containing metal is ground, the ground material is mixed with binding and filling materials, then it is placed in a shaping mould, and a building unit is produced under pressure. The characteristic feature of the invention is that steel radial tyres used as rubber waste containing metal is used, before grinding the used tyres are cut up into pieces of a maximum size of 10-30 cm, and they are ground only after being cut up previously, and after grinding the ground material containing metal is taken through separating equipment, where the assorted grains of a maximum size of 5-20 mm containing metal are separated from the rest of the ground material, and only the part of the ground material of the given grain size separated in this way is mixed with binding and filling materials.