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A secondary drainage system for buildings utilizing pre-manufactured exterior panels. The system drains off moisture and condensation collected in joints and on the rear wall of the panels, under circumstances where the primary exterior seal or cladding have failed. An elongated collection channel i

A secondary drainage system for buildings utilizing pre-manufactured exterior panels. The system drains off moisture and condensation collected in joints and on the rear wall of the panels, under circumstances where the primary exterior seal or cladding have failed. An elongated collection channel is attached in inclined relation to the rear wall of a panel. The channel includes a top cover, comprised of a trough having inclined walls and oval apertures. The lower end of the channel includes an end cap with a drain tube, connected to an upper, inner portion of a receptacle box. The receptacle box is located within a vertical joint between two adjacent panels. A lower, outer portion of the receptacle box has a one-way discharge valve. Also provided are intermediate joint gutters, having open tops and a discharge outlet positioned over the trough of a collection channel.

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1. A secondary moisture drainage system for use with buildings utilizing pre-manufactured exterior panels, comprising:an elongated collection channel sloping between an upper end and a lower end, said collection channel including opposing side walls, a bottom floor spanning said side walls, and a to

1. A secondary moisture drainage system for use with buildings utilizing pre-manufactured exterior panels, comprising:an elongated collection channel sloping between an upper end and a lower end, said collection channel including opposing side walls, a bottom floor spanning said side walls, and a top cover at least partially open for receipt of moisture, said top cover comprised of a trough having inclined side walls converging inwardly and downwardly toward a bottom channel, and in which a plurality of apertures is provided in said bottom channel; and,a receptacle box, having an upper, rear portion in hydraulic communication with said lower end of said collection channel, and having a front portion with a lower discharge outlet, so that moisture received by said collection channel is directed into said receptacle box and released through said discharge outlet. 2. A secondary moisture drainage system for use with buildings utilizing pre-manufactured exterior panels, comprising:an elongated collection channel sloping between an upper end and a lower end, said collection channel including opposing side walls, a bottom floor spanning said side walls, and a top cover at least partially open for receipt of moisture;a receptacle box, having an upper, rear portion in hydraulic communication with said lower end of said collection channel, and having a front portion with a lower discharge outlet, so that moisture received by said collection channel is directed into said receptacle box and released through said discharge outlet; and,an end cap, said end cap having side walls, and a bottom floor spanning said side walls, said end cap further including a connection flange on one end and an end wall on the other end, said connection flange being sized and configured to compression fit within said lower end of said collection channel, and said end wall sealing off said other end, said end cap further having a drain in said bottom floor adapted for hydraulic connection with said rear portion of said receptacle box. 3. A secondary moisture drainage system for use with buildings utilizing pre-manufactured exterior panels, comprising:an elongated collection channel sloping between an upper end and a lower end, said collection channel including opposing side walls in which an outer side of one of said side walls is provided with adhesive, a bottom floor spanning said side walls, and a top cover at least partially open for receipt of moisture; and,a receptacle box, having an upper, rear portion in hydraulic communication with said lower end of said collection channel, and having a front portion with a lower discharge outlet, so that moisture received by said collection channel is directed into said receptacle box and released through said discharge outlet. 4. A secondary moisture drainage system for use with buildings utilizing pre-manufactured exterior panels, comprising:an exterior panel having an outer front wall, an inner rear wall, and vertical edge; an elongated collection channel mounted on said rear wall of said exterior panel, said collection channel sloping between an upper end and a lower end and including opposing side walls, a bottom floor spanning said side walls, and a top cover at least partially open for receipt of moisture;a receptacle box mounted on said vertical edge of said panel, said receptacle box having an upper, rear portion in hydraulic communication with said lower end of said collection channel, and having a front portion with a lower discharge outlet extending to said front wall of said panel, so that moisture received by said collection channel is directed into said receptacle box and released through said discharge outlet. 5. A secondary moisture drainage system for use with buildings employing pre-manufactured exterior panels, comprising:first and second elongated collection channels, said first collection channel being mounted on a rear wall of a first panel, and said second collection channel being mounted on a rear wall of a second panel, said first and second panels having adjacent vertical edges defining a vertical joint therebetween, each of said collection channels sloping from an upper end to a lower end, said lower ends of said collection channels being proximate and said upper ends of said collection channels being remote, said collection channel including opposing side walls, a bottom floor spanning said side walls, and a top cover at least partially open for receipt of moisture; and,a receptacle box mounted within said vertical joint, said receptacle box having a rear portion in hydraulic communication with said lower ends of said collection channels, and having a front portion with a lower discharge outlet. 6. A drainage system as in claim 1 in which said apertures are oval in configuration. 7. A drainage system as in claim 4 including an end cap, said end cap having side walls, and a bottom floor spanning said side walls, said end cap further including a connection flange on one end and an end wall on the other end, said connection flange being sized and configured to compression fit within said lower end of said collection channel, and said end wall sealing off said other end, said end cap further having a drain in said bottom floor adapted for hydraulic connection with said rear portion of said receptacle box. 8. A drainage system as in claim 7 in which said drain includes a spout extending downwardly therefrom, and further including a drain tube extending between said spout and said rear portion of said receptacle box. 9. A drainage system as in claim 7 in which said end cap further includes a top cover, said top cover comprising a trough having inclined side walls converging inwardly and downwardly toward a bottom channel, and in which a plurality of apertures is provided in said bottom channel. 10. A drainage system as in claim 4 in which an outer side of one of said side walls is provided with adhesive. 11. A drainage system as in claim 4 in which an outer side of one of said side walls is provided with a flange. 12. A drainage system as in claim 11 in which said flange is dovetail in configuration. 13. A drainage system as in claim 4 including a plurality of said collection channels, and further including means for interconnecting adjacent ends of said channels so they are maintained in end to end relation and hydraulically sealed therebetween. 14. A drainage system as in claim 13 in which said interconnecting means comprises a connection coupler, said connection coupler including a first connector section, a second connector section, and a flange therebetween, said first and second connector sections being sized and configured to fit snugly within an open end of a respective collector channel, so that each of said open ends abuts said flange. 15. A drainage system as in claim 4, including a joint gutter, said joint gutter having opposing side walls, a front wall, a rear wall, a discharge outlet, and an open top, said joint gutter being positioned above said collection channel at a location intermediate said upper end and said lower end, with said discharge outlet over said top cover of said collection channel. 16. A drainage system as in claim 4, including a joint gutter, said joint gutter having a U-shaped trough with a circular cutout at an upper end and opposing lateral flanges at a lower end, said joint gutter being made from a flexible silicone elastomeric material. 17. A drainage system as in claim 4 in which said discharge outlet is provided with a one-way valve. 18. A drainage system as in claim 17 in which said one-way valve is a pinch valve. 19. A drainage system as in claim 17 in which said one-way valve is a flap valve. 20. A drainage system as in claim 4 in which said collection channel and said receptacle box are made from a flexible, flame retardant elastomeric silicone. 21. A drainage system as in claim 20 in which said silicone includes retardants to inhibit mold growth. 22. A drainage system as in claim 4 further including a removable strip having a silicone compatible adhesive on its underside, said strip being installed with its underside over a portion of said top cover for protection of openings therein. 23. A drainage system as in claim 5 in which a first section of a backer rod is located within said vertical joint, extending upwardly from said receptacle box, and in which a second section of a backer rod is located within said vertical joint, extending downwardly from said receptacle box, said first section and said second section and a front wall of said receptacle box providing a backing for sealant which is injected into said vertical joint and which spans said vertical edges, to form a weatherproofing seal. 24. A drainage system as in claim 23 in which said discharge outlet of said receptacle box passes through said weatherproofing seal. 25. A secondary moisture drainage system for use with buildings employing pre-manufactured exterior panels, comprising:[a.] an upper collection channel and a lower collection channel mounted on a rear inner wall of an exterior panel, each of said collection channels sloping from a respective upper end to a respective lower end, said lower end of said upper collection channel being adjacent and above said upper end of said lower collection channel and in hydraulic communication therewith, each of said collection channels including opposing side walls, a bottom floor spanning said side walls, and a top cover at least partially open for receipt of moisture; and,[b.] a receptacle box mounted on a vertical edge of an exterior panel, having a rear portion in hydraulic communication with said lower end of said lower collection channel, and having a front portion with a lower discharge outlet extending to a front outer wall of an exterior panel, so that moisture received by said collection channels is directed into said receptacle box and released through said discharge outlet. 26. A drainage system as in claim 25 in which said lower end of said upper collection channel includes an end cap, said end cap having side walls, and a bottom floor spanning said side walls, said end cap further including a connection flange on one end and an end wall on the other end, said connection flange being sized and configured to compression fit within said lower end of said upper collection channel, and said end wall sealing off said other end, said end cap further having a drain in said bottom floor adapted for hydraulic connection with said upper end of said lower collection channel. 27. A drainage system as in claim 26 in which said drain includes a spout extending downwardly therefrom, and further including a tube extending between said spout and said upper end of said lower collection channel. 28. A drainage system as in claim 26 in which said end cap further includes a top cover, said top cover comprising a trough having inclined side walls converging inwardly and downwardly toward a bottom channel, and in which a plurality of apertures is provided in said bottom channel. 29. A method of installing a secondary moisture drainage system to a pre-manufactured exterior panel, comprising the steps of:[a.] providing a pre-manufactured exterior panel, having a vertical edge, an inner rear wall, and an outer front wall;[b.] securing a collection channel to said rear wall of said panel, so that an upper end of said collection channel is sloping to and remote from said vertical edge and a lower end of said collection channel is proximate said vertical edge;[c.] securing a receptacle box along said vertical edge, with a front discharge outlet adjacent said front wall and a rear portion adjacent said rear wall; and,[d.] hydraulically interconnecting an upper rear portion of said receptacle box with said lower end of said collection channel. 30. A method as in claim 29, in which said step of securing said collection channel is carried out using silicone sealant. 31. A method as in claim 29, in which said step of securing said collection channel is carried out using a mortar slurry applied to said rear wall and encasing a flange on said collection channel. 32. A method as in claim 29, further including the steps of providing a second panel having a second vertical edge in spaced relation from said vertical edge of said panel, defining a vertical joint therebetween, installing an upper section of backer rod above said receptacle box and installing a lower section of backer rod below said receptacle box within said vertical joint, and injecting silicone sealant into said vertical joint from said front wall of said panel against said upper and lower sections and against said front portion of said receptacle box.