Arrangement in a protective membrane, especially for floors

A protective membrane for floors comprising a substantially planar membrane of substantially rigid material, said membrane having top and bottom surfaces and a reference plane which substantially coincides with said top surface of said membrane;

• said bottom surface having a plurality of protrusions, wherein each of said protrusions has a root area between said top and bottom surfaces and substantially adjacent to said protrusion;
• and said top surface having a number of indentations corresponding to said protrusions, wherein one or more of said protrusions each have a yielding zone which combines with said top and bottom surfaces to produce a yielding and load dissipation effect when said membrane is subjected to a load, and wherein each of said yielding zones are substantially adjacent to said root area, said yielding zone having a cavity, said cavity substantially defined by curved areas adjacent to said root area, said curved areas comprising inner and outer curved areas, said inner curved area being adjoined to said protrusion and having a top surface positioned at a distance from said reference plane, and said outer curved area being adjoined to said inner curved area and said outer curved area also being adjoined to said membrane to form an outer edge wherein said outer edge is positioned at a lesser distance from said reference plane than said distance of said top surface of said inner curved area.