Patent ID: 7743562

Claim:
A lightweight construction element forming an upright wall for a bathroom shower incorporating plumbing fixtures, said construction element comprising a plastic foam core with at least one external, fiber-reinforced mortar layer and an inner area of the wall that is reinforced with at least one wall component of more rigid material for the attachment of the plumbing fixtures that project out from an inner surface on one side of the lightweight construction element that forms a working side facing the shower area, the improvement wherein said at least one wall component is inserted into a groove cut into said working side of the plastic foam core, wherein the groove is sealed on the working side using a foam filler element in the form of a plastic foam board, wherein the wall component is of a waterproof plastic, and wherein the groove is in the form of a channel cut with a mirror-symmetrical stepped cross-section that narrows toward the inner side, whereby the groove has opposing steps and at least the filler element rests against the opposing steps, thereby hiding the wall component.