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A roofing membrane retainer is provided having a cylindrical plate. The cylindrical plate has a central aperture for receiving a fastener. The plate also includes a pair of concentric inner and outer raised reinforcing ribs and a plurality of scoop-shaped projections. The scoop-shaped projections ex

A roofing membrane retainer is provided having a cylindrical plate. The cylindrical plate has a central aperture for receiving a fastener. The plate also includes a pair of concentric inner and outer raised reinforcing ribs and a plurality of scoop-shaped projections. The scoop-shaped projections extend downwardly from the plate in concentric inner and outer cylindrical arrays. The inner cylindrical array of projections and the outer cylindrical array of projections are radially outward of the inner rib and the outer rib, respectively. The projections each comprise a scoop with a base periphery having an open mouth edge and a remaining peripheral portion contiguous with the plate. The projections in each array are spaced equidistance about the plate. The mouth edge of adjacent projections are oriented in alternating radial inward and outward directions.

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1. A roofing membrane retainer, comprising: a cylindrical plate having a central aperture for receiving a fastener, the plate having: a pair of concentric inner and outer raised reinforcing ribs; andplurality of scoop-shaped projections extending downwardly from the plate in concentric inner and out

1. A roofing membrane retainer, comprising: a cylindrical plate having a central aperture for receiving a fastener, the plate having: a pair of concentric inner and outer raised reinforcing ribs; andplurality of scoop-shaped projections extending downwardly from the plate in concentric inner and outer cylindrical arrays;wherein the inner cylindrical array of projections and the outer cylindrical array of projections are radially outward of the inner rib and the outer rib, respectively; andwherein the projections each comprise a scoop with a base periphery having an open mouth edge and a remaining peripheral portion contiguous with the plate, the projections in each array spaced equidistant about the plate, and with the mouth edge of adjacent projections oriented in alternating radial inward and outward directions. 2. The roofing membrane retainer of claim 1, wherein the inner reinforcing rib and the outer reinforcing rib each comprise an upwardly projecting cylindrical groove. 3. The roofing membrane retainer of claim 2, wherein each of the inner groove and the outer groove has a semi-cylindrical cross-sectional profile. 4. The roofing membrane retainer of claim 1, wherein each of the projections comprises an axisymmetric shell segment. 5. The roofing membrane retainer of claim 4, wherein the axisymmetric shell segment is an eyelid-shaped projection. 6. The roofing membrane retainer of claim 1, wherein any selected group of three nearest neighbor projections from the inner array, the outer array, or both the inner array and the outer array includes at least one projection extending in a radial outward direction and at least another projection extending in a radial inward direction. 7. The roofing membrane retainer of claim 1, wherein each projection in the outer array is positioned with a centerline axis orientation located angularly midway between a pair of adjacent projections in the inner array. 8. The roofing membrane retainer of claim 1, wherein each of the projections comprises a severed conic section that is symmetric about a center axis extending in a radial direction. 9. A roofing membrane seam plate, comprising: a plate having a closed curve outer periphery with a central aperture sized to receive a fastener, the plate including: a pair of circumferentially extending inner and outer raised reinforcing ribs; anda plurality of obtuse projections extending downwardly from the plate in inner and outer circumferential arrays, each projection including a scoop with a peripheral portion contiguous with the plate and an open mouth edge separated from the plate, the inner circumferential array of projections and the outer circumferential array of projections provided radially outward of the inner rib and the outer rib, respectively, the projections in each array spaced equidistant about the plate, and the mouth edge of adjacent projections within the inner array and the outer array oriented in alternating radial inward and outward directions. 10. The seam plate of claim 9, wherein the plate is a cylindrical plate having an upturned outer peripheral edge portion and the inner and outer reinforcing ribs are concentric. 11. The roofing membrane retainer of claim 9, wherein the inner and outer circumferential arrays each comprise a cylindrical array. 12. The roofing membrane retainer of claim 9, wherein the projections in the inner array and the outer array are oriented with the mouth edge of adjacent projections within each array oriented in alternating radial inward and outward directions. 13. The roofing membrane retainer of claim 9, wherein each projection comprises an axisymmetric shell segment forming a downwardly extending eyelid-shaped projection. 14. The roofing membrane retainer of claim 9, wherein the reinforcing ribs are each cylindrical, and each projection in the outer array is positioned with a centerline axis orientation located angularly midway between a pair of adjacent projections in the inner array. 15. The seam plate of claim 9, wherein adjacent projections in each circumferential array are spaced apart 60 degrees, and adjacent projections from the inner array and the outer array, respectively, are spaced apart 30 degrees. 16. The roofing membrane retainer of claim 15, wherein each scoop forms an eyelid-shaped shell having an open mouth edge. 17. The seam plate of claim 9, wherein any selected group of three nearest neighbor projections from the inner array, the outer array, or both the inner array and the outer array includes at least one projection extending in a radial outward direction and at least another projection extending in a radial inward direction. 18. A roofing membrane retainer, comprising: a plate having a central aperture for receiving a fastener, the plate having: a pair of concentric inner and outer raised reinforcing ribs; anda plurality of scoop-shaped projections extending downwardly from the plate in concentric inner and outer circumferential arrays;wherein the inner circumferential array of projections and the outer circumferential array of projections are radially outward of the inner rib and the outer rib, respectively; andwherein the projections each comprise a scoop with a base periphery having an open mouth edge and a remaining peripheral portion contiguous with the plate, the projections in each array spaced equidistant about the plate, and with the mouth edge of at least three adjacent projections in each array oriented in alternating radial inward and outward directions. 19. The roofing membrane retainer of claim 18, wherein the plate comprises a round plate with concentric inner and outer cylindrical arrays of projections. 20. The roofing membrane retainer of claim 18, wherein each of the scoops comprises a symmetric scoop having an axis of symmetry extending in a radial direction. 21. A roofing membrane retaining washer, comprising: a cylindrical plate with a central aperture configured to receive a fastener, the plate further including: an inner reinforcing rib;an outer reinforcing rib;a plurality of projections each comprising a scoop-shaped projection formed contiguously with the plate and having a free edge separated from the plate, each projection extending downwardly from the plate and configured in concentric inner and outer cylindrical arrays, each projection comprising a free-edge axisymmetric three dimensional curved shell structure; andan upturned outer peripheral edge portion. 22. The roofing membrane retainer of claim 21, wherein the axisymmetric shell segment is an eyelid-shaped projection. 23. The roofing membrane retainer of claim 21, wherein any selected group of three nearest neighbor projections from the inner array, the outer array, or both the inner array and the outer array includes at least one projection extending in a radial outward direction and at least another projection extending in a radial inward direction. 24. A roofing membrane retaining washer, comprising: a cylindrical plate with a central aperture configured to receive a fastener, the plate further including: an inner reinforcing rib;an outer reinforcing rib;a plurality of projections each extending downwardly from the plate and configured in concentric inner and outer cylindrical arrays, each projection comprising a free-edge axisymmetric three dimensional curved shell structure; andan upturned outer peripheral edge portion;wherein the inner reinforcing rib and the outer reinforcing rib each comprise a cylindrical groove having a semi-cylindrical cross section. 25. The roofing membrane retainer of claim 24, wherein the projections in each of the inner and outer cylindrical arrays are spaced equidistant about the plate. 26. The roofing membrane retainer of claim 24, wherein each projection in the outer array is positioned with a centerline axis orientation located angularly midway between a pair of adjacent projections in the inner array. 27. A roofing membrane retaining washer, comprising: a cylindrical plate with a central aperture configured to receive a fastener, the plate further including: an inner reinforcing rib;an outer reinforcing rib;a plurality of projections each extending downwardly from the plate and configured in concentric inner and outer cylindrical arrays, each projection comprising a free-edge axisymmetric three dimensional curved shell structure; andan upturned outer peripheral edge portion;wherein the inner reinforcing rib and the outer reinforcing rib are concentric. 28. The roofing membrane retainer of claim 27, wherein each of the free-edge axisymmetric shell structures comprises a severed conic section that is symmetric about a center axis extending in a radial direction. 29. The roofing membrane retainer of claim 27, wherein any selected group of three nearest neighbor projections from the inner array, the outer array, or both the inner array and the outer array includes at least one projection extending in a radial outward direction and at least another projection extending in a radial inward direction.