by reference the fastener 17 comprises a three piece non membrane penetrating fastener see fig2 all three pieces of the fasteners are formed of a rigid material such as polyvinyl chloride the first piece of the fastener 17 is a base or anchor disk 26 the anchor disk 26 comprises a generally flat circular disk 27 having a hollow inverted frusto conical projection or button 28 extending upwardly from the central portion of the disk 27 the wall 29 of the button 28 extends radially outward from the disk 27 so that a top or rim 31 of the button 28 is wider than the base 32 of button 28 the button 28 further includes a hollow interior 33 adapted to receive the head of a bolt a screw or nail a hole 34 extends from within the interior 33 directly through the center of disk 27 the hole is adapted to permit the shank of a bolt screw or nail to pass through and to prevent the head of the bolt screw or nail from passing through the anchor disk 26 is fastened to the deck 11 by screw 35 having a shank portion 36 extending through hole 34 through the center of anchor 26 into the deck 11 a plurality or array of these anchor disks are secured to the central portion 24 of the roof surface normally spaced two to four feet on center the disks and the roof deck are covered with the epdm rubber sheeting material generally having a thickness of from 0 040 0 065 inches in thickness the membrane is held to the anchor disks by the second piece of the fastener 38 a circular tined retainer cap 38.