Abstract: A roof construction has a substantially flat, horizontal substrate, which may be of insulating material, having mounted thereon at least one structure having an inclined surface. A membrane of water-impervious material extends over the substrate and over the structure. The portion of the membrane covering the inclined surface of the structure has photocells thereon, the inclination and orientation of the inclined surface being selected for maximum radiation reception from the sun. The structure may be of generally triangular shape, is thermally insulating, and a plurality of parallel structures may be provided, with photocells on parallel, inclined surfaces. The structures may have additional surfaces which are opposite and facing the first mentioned surface of an adjacent structure, which additional surface or surfaces is provided with a reflective film for reflecting radiation into the photocells of the adjacent structure.

Abstract: A body for use in a membrane anchor system made of resilient metal a central region with an opening therein, a downwardly sloping region and a peripheral region outwardly of the downwardly sloping region. An anchor system including said body, wherein a linear fastener extends through the body and through a membrane, and mastic is placed between the body and the membrane.An anchor system utilizing the said body, and having a sheet of water-impervious material extending over and beyond the body, and adhered to the body and the membrane.

Abstract: A membrane anchor comprises a disc of rubber-like material having a central opening and downwardly inclined upper and lower surfaces. The lower surface has grooves for receiving mastic.