Decoupled floor underlayment

A decoupled floor underlayment, the floor underlayment with multiple-layer composite structures comprising a wiring layer, and a adhesive layer disposed on bottom of the wiring layer, the wiring layer comprising a body of the wiring layer, and a plurality of protrusion portions disposed on the body of the wiring layer, the plurality of the protrusion portions being arranged in a rectangular array on the body of the wiring layer, a wiring groove for embedding pipes being defined by adjacent protrusion portions;

• a pipe fixing element disposed in the wiring groove being defined by at least a partial-convex outer wall of the plurality of the protrusion portions, an accommodation space for pipes being defined by the pipe fixing element between the adjacent protrusion portions and the body of the wiring layer, the pipes fixed in the accommodation space for pipes;
• the protrusion portions comprising a first protrusion portion and a second protrusion portion with different types of structures, the first protrusion portion and the second protrusion portion arranged in a staggered manner in an equidistant manner on the body of the wiring layer row by row, column by column, a middle portion of the first protrusion portion defining a first concave structure with a small top portion and a large bottom portion, a second concave structure with a small top portion and a large bottom portion defined between the adjacent protrusion portions defining, and a middle portion of the second protrusion portion defining a third concave structure with a small top portion and a large bottom portion.