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A trim bead for a building wall incorporates an outwardly extending flange portion to provide a mechanical key for a layer of exterior finishing coatings, such as stucco coatings. The trim bead may be used in stucco systems for exterior building walls that employ continuous thermal insulation over t

A trim bead for a building wall incorporates an outwardly extending flange portion to provide a mechanical key for a layer of exterior finishing coatings, such as stucco coatings. The trim bead may be used in stucco systems for exterior building walls that employ continuous thermal insulation over the building wall substrate.

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1. A trim bead for a building wall comprising: spaced-apart front and rear walls;a bottom wall connecting the front and rear walls, a portion of said bottom wall extending beyond the front wall and including an inclined wall portion extending back toward and terminating at the front wall; anda horiz

1. A trim bead for a building wall comprising: spaced-apart front and rear walls;a bottom wall connecting the front and rear walls, a portion of said bottom wall extending beyond the front wall and including an inclined wall portion extending back toward and terminating at the front wall; anda horizontal flange portion extending from the front wall, wherein said horizontal flange includes a plurality of openings communicating through the thickness of the flange, wherein said flange comprises a mesh, diamond mesh, or a ribbed structure. 2. The trim bead of claim 1, wherein said bottom wall comprises at least one weep hole. 3. The trim bead of claim 1, wherein said rear wall comprises at least one opening communicating at least partially through the thickness of the rear wall. 4. The trim bead of claim 1, wherein said flange is perforated, stamped, or expanded. 5. The trim bead of claim 4, wherein said flange is perforated. 6. The trim bead of claim 4, wherein said flange is stamped. 7. The trim bead of claim 4, wherein said flange is expanded. 8. The trim bead of claim 1, wherein said trim bead comprises polymer material, a metal material, a metal alloy material, or composite material. 9. The trim bead of claim 1, wherein said flange comprises a mesh. 10. The trim bead of claim 1, wherein said flange comprises a diamond mesh. 11. The trim bead of claim 1, wherein said flange comprises a ribbed structure. 12. An exterior finish system for a building wall comprising: a trim bead comprising spaced-apart front and rear walls; a bottom wall connecting the front and rear walls, a portion of said bottom wall extending beyond the front wall and including an inclined wall portion extending back toward and terminating at front wall; and a horizontal flange portion extending from the front wall, wherein said flange includes a plurality of openings communicating through the thickness of the flange;an insulation layer; andat least one layer of an exterior finishing coating applied to the insulation layer and the flange of the trim bead. 13. The exterior finish system of claim 12, wherein said bottom wall comprises at least one weep hole. 14. The exterior finish system of claim 12, wherein said rear wall comprises at least one opening communicating at least partially through the thickness of the rear wall. 15. The exterior finish system of claim 12, wherein said flange comprises a mesh, diamond mesh, or a ribbed structure. 16. The exterior finish system of claim 15, wherein said flange comprises a mesh. 17. The exterior finish system of claim 15, wherein said flange comprises a diamond mesh. 18. The exterior finish system of claim 15, wherein said flange comprises a ribbed structure. 19. The exterior finish system of claim 12, wherein said flange is perforated, is stamped, or is expanded. 20. The exterior finish system of claim 19, wherein said flange is perforated. 21. The exterior finish system of claim 19, wherein said flange is stamped. 22. The exterior finish system of claim 19, wherein said flange is expanded. 23. The exterior finish system of claim 12, wherein said trim bead comprises polymer material, a metal material, a metal alloy material, or composite material. 24. The exterior finishing system of claim 12, further comprising a weather resistive barrier. 25. The exterior finishing system of claim 12, further comprising a reinforcement layer attached to said insulation layer for holding exterior finishing coatings. 26. The exterior finishing system of claim 12, wherein said exterior finishing coatings comprise at least one layer of stucco. 27. A building wall comprising: a frame;a building wall substrate capable of being attached to the frame;a trim bead attached to said frame, or to the building wall substrate, said trim bead comprising spaced-apart front and rear walls; a bottom wall connecting the front and rear walls, a portion of said bottom wall extending beyond the front wall and including an inclined wall portion extending back toward and terminating at the front wall and a horizontal flange portion extending from the front wall, wherein said flange includes a plurality of openings communicating through the thickness of the flange;an insulation layer adjacent the trim bead and attached to said frame, or to the building wall substrate;and at least one layer of an exterior finishing coating applied to the insulation layer and the flange of the trim bead. 28. The building wall of claim 27, further comprising a reinforcement layer attached to said insulation layer. 29. The building wall of claim 28, wherein said reinforcement layer comprises a lath. 30. The building wall of claim 29, wherein said exterior finishing coating comprises at least one layer of a stucco coating applied to the insulation layer and the flange of the trim bead. 31. The exterior finishing system of claim 27, further comprising a weather resistive barrier. 32. The building wall of claim 27, wherein said flange comprises a mesh. 33. The building wall of claim 27, wherein said flange comprises a diamond mesh. 34. The building wall of claim 27, wherein said flange comprises a ribbed structure. 35. The building wall of claim 27, wherein said flange is perforated. 36. The building wall of claim 27, wherein said flange is stamped. 37. The building wall of claim 27, wherein said flange is expanded. 38. A process for finishing an exterior building wall comprising: attaching a building wall substrate to a frame;attaching a trim bead to the exterior surfaces of the building wall substrate, wherein said trim bead comprising spaced-apart front and rear walls, a bottom wall connecting the front and rear walls, a portion of said bottom wall extending beyond the front wall and including an inclined wall portion extending back toward and terminating at the front wall; and a horizontal flange portion extending from the front wall, wherein said flange includes a plurality of openings communicating through the thickness of the flange;attaching an insulation layer to the building wall substrate; andapplying a layer of an exterior finishing material coating to the surfaces of the insulation layer and the flange of the trim bead. 39. The process of claim 38, further comprising attaching a reinforcing layer to said insulation layer. 40. The process of claim 39, wherein said attaching a reinforcing layer to said insulation layer comprises attaching a lath to said insulation layer. 41. The process for finishing an exterior building wall of claim 40 comprising: applying a layer of a stucco coating to the surfaces of the insulation layer and the flange of the trim bead. 42. The exterior finishing system of claim 41, further comprising a weather resistive barrier. 43. The process of claim 38, wherein said flange comprises a mesh. 44. The process of claim 38, wherein said flange comprises a diamond mesh. 45. The process of claim 38, wherein said flange comprises a ribbed structure. 46. The process of claim 38, wherein said flange is perforated. 47. The process of claim 38, wherein said flange is stamped. 48. The process of claim 38, wherein said flange is expanded.