An acoustic attenuation panel including: a main layer made of a porous material and having two opposite faces; a coating layer arranged on one of the two faces of the main layer; an adhesive film, arranged at the interface between the main layer and the coating layer to assemble same. The main layer is a body made of melamine resin foam having a density between 6 and 6.8 kg/m.sup.3 and a porosity rate between 0.978 and 0.984; the coating layer is a fabric with a density between 484 and 526 kg/m.sup.3 and a porosity rate between 0.771 and 0.817; the adhesive film is a film made of a thermoplastic material provided with holes passing through and having a surface density between 40 g/m.sup.2 and 56 g/m.sup.2.

A layered building element for protecting exterior or interior building surfaces is disclosed. Exterior or interior surfaces may include both vertical and horizontal surfaces, such as walls, roofs, or floors. The layered building element includes a flexible sheet comprising at least one elastomer layer in communication with an elastomer-impregnated fiberglass layer. Each elastomer layer may be bound in communication to the fiberglass layer at an interface comprising elastomer-impregnated fiberglass. The flexible sheet may form, for example, shingles, tiles, or a cylindrical roll, which may support portability and installation of the layered building element.

An improved reefer wall panel having better foam adhesion includes purposefully spaced gaps in the looped sections to be foamed. Such spaced gaps may extend horizontally, vertically, diagonally or in combinations of directions. These gaps (random or patterned) may be applied to the whole of a reefer panel or to just the more vulnerable lower sections where traffic impact during loading/unloading is more common and/or where delamination is known to occur more frequently. A method of reefer panel manufacture with such spaced gaps is also disclosed.

An improved reefer wall panel having better foam adhesion by including a plurality of hook and loop tape sections. The sections, as strips, may be applied horizontally or diagonally and may extend from the top to near the bottom of any such wall panel before foaming. They may be applied to the whole of panel, randomly throughout or to just the more vulnerable lower sections of a given panel.

A carriage body for a passenger transport vehicle has a carriage body shell which has side walls provided with cut-outs for doors and/or windows, a roof and end walls which are composed of metal structures. The carriage body shell has wall segments which are formed from material through which mobile communication frequencies (frequency f>700 MHz) can pass and are inserted into openings in the metal structures.