Underlayment membrane

An underlayment membrane between a base surface and an outer coating of a wall, a ceiling, or a floor of a building, said membrane (1) comprising:

• at least one base layer (2);
• and
• a plurality of protrusions (3) arising from said base layer (2) and configured to retain a conditioning element,
• wherein said protrusions (3) are arranged to define, between their side walls (15), a plurality of paths (16, 17) adapted to receive the conditioning element, and
• wherein at least one of said plurality of paths is adapted to retain said conditioning element by having:
• a plurality of first straight portions (18) defined, along a same direction, by first protrusions of said plurality of protrusions (3) that are positioned in facing relationship to be on opposite sides of said conditioning element and that are spaced apart by a predefined distance at most equal to a thickness of the conditioning element, so as to hold the conditioning element by friction;
• and
• one or more second arched portions (25) each positioned between two of the plurality of first straight portions (18) and defined by second protrusions (3) of said plurality of protrusions, said second protrusions being arranged in facing relationship along lines (26) that intersect obliquely said same direction and being spaced from each other by a predefined distance greater than the thickness of the conditioning element, so that the conditioning element is retained by elastic-mechanical contrast with one of the side walls (15) of one of said second protrusions (3).