Abstract: A non-penetrating fastener for mounting elastomeric sheeting to a roof includes a base plate adapted to be fixedly mounted to the roof and having a surface which mounts an induction heating element coated with hot melt adhesive, and a rigid top plate having a surface which mounts a second induction heating element coated with hot melt adhesive. The rigid top plate and base plate are positioned on opposite sides of an elastomeric sheet so that their adhesive coated surfaces of their induction heating elements contact the sheet and the rigid top plate overlies the base plate. In response to bombardment with a magnetic flux from an induction welding device, the induction heating elements of both the base plate and rigid top plate heat the adhesive thereon to the molten state for adhesion to the elastomeric sheet.

Abstract: A fastener adapted to secure a roof membrane to a roof surface without penetration of the membrane includes an anchor disc having an inverted frustoconical button, an externally threaded tined retainer adapted to fit over the button with the membrane trapped between the retainer and the button and an internally threaded cover adapted to screw over the retainer and hold it in place over the button. The anchor disc includes a plurality of ribs which extend from the base up to the button. The tined retainer includes a number of tines corresponding to the areas between the individual ribs so that one tine fits between each pair of adjacent ribs. These ribs thereby prevent the rotation of the retainer when the cover is screwed over the retainer. The retainer also includes an upper ring portion and a lower tined portion which permits the tines to flex outwardly but not upwardly. Therefore the threads on the tined portion cannot become misaligned.

Abstract: A three-piece fastener for securing a flexible roofing membrane to a roof without penetrating the membrane. The fastener includes an anchoring disc having a centrally located, upwardly-directed projection or button in the central portion thereof which preferably has a hollow inverted frusto-conical shape. The disc is screwed or nailed to a roof surface, and the roofing membrane laid over the disc. Thereafter, an externally threaded, tined retainer cap of resilient material, which forms a second element of the fastener, is snapped over the button with the membrane located therebetween. An internally threaded cover screws onto the tined retainer, preventing the retainer from popping off the button. The tined cap is lubricated with a permanent non-evaporating lubricant, such as silicon grease, to facilitate its use without damaging the membrane.