Patent ID: 7849635

Claim:
Building encasement element with a foil cushion that comprises an outer foil layer forming the outside of a building envelope and an inner foil layer forming the inside of a building envelope, wherein these foil layers form, between themselves, at least one essentially fluid-tight, enclosed hollow space in which a fluid medium is contained, and with a reinforcement element wherein: the reinforcement element divides the essentially fluid-tight, enclosed hollow space into a first, essentially fluid-tight, enclosed chamber between the inner foil layer and the reinforcement element and into a second, essentially fluid-tight, enclosed chamber between the outer foil layer and the reinforcement element, the fluid medium in the first chamber is pressurized with a first pressure and the fluid medium in the second chamber is pressurized with a second pressure that is below that of the first, and one or both of the magnitudes of the first and second pressures and the ratio of the first and second pressures is formed so that the reinforcement element reduces the stress on the outer foil layer by transmitting a part of the stress of the outer foil layer via the pressurized fluid medium onto the reinforcement element.