Abstract: An anchor plate for securing a membrane to a sub-structure such as a roof, tunnel, tank etc. The plate has an elevated bonding platform and a enlarged central countersink, sufficiently deep to accommodate the head of a fastening screw, without the screw head protruding above the top profile of the anchor plate when the screw secures the plate to the underlying substructure. The height difference between the bonding platform and the base of the countersink together with the fact that the countersink area is wider than the head of the screw ensures that when the screw is fastened to the underlying substructure, the bonding platform does not flex. The bonding platform carries a heat activated adhesive which is inductively heated to secure an overlying membrane to the substructure.

Abstract: An induction heater having an induction coil (26) for heating a metallic substance (4) hidden by a membrane (2), the metallic substance being coated with a heat activated adhesive on its side adjacent the membrane (2). The heater having four location sensor coils (36) for detecting the position of the hidden metallic substance and means to facilitate the placement of the induction coil (26) over the hidden metallic substance (4), based on information from the sensors. Once the induction coil (26) is over the metallic substance (4) it is used to heat the adhesive thereby adhering the metallic substance (4) to the membrane (2). The sensors (36) are adjacent the inductor coil (26) and are insulated therefrom by an air gap (38).