Patent ID: 8584420

Claim:
A method of erecting a building having a vertically extending cavity wall of two or more leaves comprising the steps of: erecting part of one leaf of the cavity wall of the building; securing to the erected part of the leaf of the cavity wall a spacer device which determines a separation of building elements of the two leaves of the vertically extending wall during construction, the wall spacer comprising a support body having a plurality of spaced projections extending horizontally therefrom and vertically spaced apart from each other across the cavity between said two leaves, each projection having means for preventing or at least inhibiting transfer of moisture at least in one direction from one end of the projection to the other; erecting at least part of an other leaf of the cavity wall of the building, in a position spaced from the said one leaf by a distance determined by the said spacer device; and wherein the spacer device is orientated in the cavity wall of the building so that a support body of the spacer device is against an inner face of an exterior leaf of the cavity wall and a plurality of projections of the support body extend toward an interior leaf of the cavity wall of the building.