Substrate for a sensitive floor and method for displaying loads on the substrate

The substrate (1; 50) for making a sensitive floor comprises: a first frame made of high-conductivity sensing means (2a-2d) having a first orientation; a second frame made of high-conductivity sensing means (3a-3d) which is adapted to be laid on said first frame and has a second orientation, other than said first orientation, said second frame (3a-3d) forming a support layer for floor finishing products; an element (4) made of a conductive material, which comprises: an elastically compressible thickness (S1), two opposite faces (104, 204) contacting said two first and second frames (2a-2d), (3a-3d), an electric resistor whose resistance is proportional to said thickness (S1).