A method for the renovation and new construction of wet rooms, such as bathrooms, in which large-format panel modules (10; 10') are attached to a wall and/or a floor and/or a ceiling of the wet room, and where panel modules (10; 10') comprising a water-impermeable core on the basis of a foam core are provided for installation in the wet room, characterized by the following method steps: a) determining an installation position of a panel module (10; 10') on the floor and/or the wall and/or the ceiling of the wet room; b) attaching at least one water-resistant sealing strip section (16; 17) on the wall and/or on the floor and/or on the ceiling of the wet room in a position which forms an outer contour of the panel module (10; 10') so that, in the fully assembled state, a sealing is provided between panel module (10; 10') and wall, floor or ceiling which is arranged behind the panel module (10; 10') and thus in a region that is no longer accessible after the panel modules (10; 10') have been installed; c) applying a water-resistant sealing adhesive to the at least one sealing strip section (16; 17) attached to the floor and/or the wall and/or the ceiling of the wet room in such a manner that the watertight sealing adhesive continuously underlays the edge regions of two adjacent panel modules (10; 10') in the fully assembled state; d) pressing a first panel module (10; 10') onto a first subregion of the sealing adhesive in a position in which the sealing strip section (16; 17) and a second part of the sealing adhesive protrude beyond the outer contour of the panel module (10; 10') such that a second panel module (10; 10') following the first panel module (10, 10') covers the part of the sealing strip section (16; 17) protruding beyond the first panel module (10; 10') and the second part of the sealing adhesive and that a seal point can be produced between the first and second panel module (10; 10') which prevents moisture from reaching the wall, the floor or the ceiling through a joint formed between the panel modules (10; 10'). a) determining an installation position of a panel module (10; 10') on the floor and/or the wall and/or the ceiling of the wet room; b) attaching at least one water-resistant sealing strip section (16; 17) on the wall and/or on the floor and/or on the ceiling of the wet room in a position which forms an outer contour of the panel module (10; 10') so that, in the fully assembled state, a sealing is provided between panel module (10; 10') and wall, floor or ceiling which is arranged behind the panel module (10; 10') and thus in a region that is no longer accessible after the panel modules (10; 10') have been installed; c) applying a water-resistant sealing adhesive to the at least one sealing strip section (16; 17) attached to the floor and/or the wall and/or the ceiling of the wet room in such a manner that the watertight sealing adhesive continuously underlays the edge regions of two adjacent panel modules (10; 10') in the fully assembled state; d) pressing a first panel module (10; 10') onto a first subregion of the sealing adhesive in a position in which the sealing strip section (16; 17) and a second part of the sealing adhesive protrude beyond the outer contour of the panel module (10; 10') such that a second panel module (10; 10') following the first panel module (10, 10') covers the part of the sealing strip section (16; 17) protruding beyond the first panel module (10; 10') and the second part of the sealing adhesive and that a seal point can be produced between the first and second panel module (10; 10') which prevents moisture from reaching the wall, the floor or the ceiling through a joint formed between the panel modules (10; 10').