Mortar and debris collection device and system

Abstract

A mortar and debris collection device for a cavity wall construction has a non-water absorbent body formed with circuitous paths therethrough making the body water-permeable. The collection device has a porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and other debris to pass therethrough to weep holes or other water channels covered by the collection debris. The device may be freely placed on the wall base within the cavity to cover the opening of a weep hole, or may also be placed on existing wall ties within the cavity.

What is claimed is: 
     
       1. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body positioned in alignment with at least some of said channel openings, said body having circuitous non-linear pathways therethrough which interrupt the downward movement of free-falling material and extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is .[.substantial.]. .Iadd.substantially .Iaddend.prevented from passing therethrough, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls.Iadd., said body having a plurality of upwardly facing first surfaces formed thereon that are separated by first horizontal spaces, and a plurality of upwardly facing second surfaces formed thereon that are separated by second horizontal spaces, said second surfaces elevated from said first surfaces, at least some of said first surfaces being disposed in vertical alignment with some of said second horizontal spaces between said second surfaces, whereby mortar and other debris falling under the influence of gravity within said cavity contacts at least one of said first and second surfaces.Iaddend..   
     
     
       2. .[.The collection device of claim 1.]. .Iadd.A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body positioned in alignment with at least some of said channels openings, said body having circuitous non-linear pathways therethrough which interrupt the downward movement of free-falling material and extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is substantially prevented from passing therethrough, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer wall, .Iaddend.wherein said body is elongated along a long axis and has an upper surface with a non-planar contour of peaks and valleys along said long axis adapted to break up accumulations of mortar and debris falling thereon.   
     
     
       3. The collection device of claim 2 wherein said body has an upper surface with a repeating dove-tailed contour along its long axis. 
     
     
       4. .[.The collection device of claim 1 further including.]. .Iadd.A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body positioned in alignment with at least some of said channels openings, said body having circuitous non-linear pathways therethrough which interrupt the downward movement of free-falling material and extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is substantial prevented from passing therethrough, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer wall, and .Iaddend.a wick for wicking water attached to said body, said wick being adapted to fill a channel.   
     
     
       5. The collection device of claim 1 wherein said body is adapted to be emplaced within the cavity resting on a wall base at the bottom of the cavity, with the body covering at least one respective channel opening and blocking the channel opening from mortar and debris. 
     
     
       6. The collection device of claim 2 wherein said body has a horizontal thickness defined perpendicular to said long axis, and has a non-planar contour along said thickness on said upper surface. 
     
     
       7. The collection device of claim 1 wherein the body portion having a thickness dimension substantially the same as the space between said inner and outer walls is located at the lower end of said body. 
     
     
       8. The collection device of claim 1 wherein said body has substantially the same thickness dimension throughout its length and height. 
     
     
       9. The collection device of claim 1 wherein said body is positioned in alignment with at least some of said channel openings by being positioned directly outwardly of said openings. 
     
     
       10. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body having circuitous non-linear pathways therethrough extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is substantially prevented from passing therethrough, said body being formed of a water-resistant fibrous mass and emplaceable within the cavity without any fixation device required.Iadd., said body having first and second horizontal surface portions exposed from above and located on at least two elevations.Iaddend..   
     
     
       11. .[.The collection device of claim 10.]. .Iadd.A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body having circuitous non-linear pathways therethrough extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is substantially prevented from passing therethrough, said body being formed of a water-resistant fibrous mass and emplaceable within the cavity without and fixation device required, .Iaddend.wherein said body is elongated along a long axis and further includes at least one reinforcing rod affixed to said body extending generally parallel to said long axis.   
     
     
       12. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed therein through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a water-permeable porous body of non-water absorbent randomly oriented fibrous material positioned in alignment with at least some of said weep hole openings, said body having a porosity sufficient to permit water to pass therethrough but mortar and debris is substantially prevented from passing therethrough,   said body having an upper surface including upwardly extending protrusions yielding peaks and valleys adapted to break up accumulations of mortar and debris falling thereon, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls.   
     
     
       13. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed through a wall through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the inner and outer walls, comprising: a body of randomly oriented non-water absorbent fibrous material formed into a water-permeable porous mass, said body being positioned in alignment with at least some of weep hole openings and having a porosity sufficient to permit water to pass therethrough but substantially insufficient to permit mortar and debris to pass therethrough, said body having a height and width sized to cover at least one of the weep hole openings and emplaceable within the cavity without any fixation device required, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls.Iadd., said body having a plurality of upwardly facing first surfaces formed thereon that are separated by first horizontal spaces, and a plurality of upwardly facing second surfaces formed thereon that are separated by second horizontal spaces, said second surfaces elevated from said first surfaces, at least some of said first surfaces being disposed in vertical alignment with some of said second horizontal spaces between said second surfaces, whereby mortar and other debris falling under the influence of gravity within said cavity contacts at least one of said first and second surfaces.Iaddend..   
     
     
       14. The collection device of claim 13 wherein said body is emplaced within the cavity and rests on a wall base at the bottom of the cavity to cover at least one respective opening and block the opening from mortar and debris. 
     
     
       15. The collection device of claim 13 further including a wick for wicking water extending from said body at a body bottom, said wick adapted to fit within the weep hole. 
     
     
       16. A drainage system for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed through one of the walls adjacent a wall base at the bottom of the walls through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a plurality of horizontally elongated drainage blocks, each of said blocks being made of porous material formed with circuitous paths through said blocks through which water can pass but through which mortar and other debris cannot pass, each said block being sized to fit within the cavity with a lateral face of said block being positioned in alignment with and covering at least one respective opening and blocking the opening from mortar and other debris with said block resting on the wall base, each of said blocks having an upper surface upon which mortar and other debris can collect, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls.Iadd., said upper surface having first and second horizontal surface portions exposed from above and located on at least two elevations.Iaddend..   
     
     
       17. .[.The drainage system of claim 16 wherein said drainage blocks have an.]. .Iadd.A drainage system for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed through one of the walls adjacent a wall base at the bottom of the walls through which weep holes water can drain from a weep hole opening communication with a cavity defined between the walls, comprising: a plurality of horizontally elongated drainage blocks, each of said blocks being made of porous material formed with circuitous paths through said blocks through which water can pass but through which mortar and other debris cannot pass, each said block being sized to fit within the cavity with a lateral face of said block being positioned in alignment with and covering at least one respective opening and blocking the opening from mortar and other debris with said block resting on the wall base, each of said blocks having an upper surface upon which mortar and other debris can collect, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls, said .Iaddend.upper surface including upwardly extending protrusions formed thereon creating a non-planar surface contour of peaks and valleys.   
     
     
       18. A drainage system for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed therein adjacent a wall base at the bottom of the walls through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a plurality of horizontally elongated debris blocking bodies, each of said bodies being made of non-water absorbent material formed into a permeable mass having a porosity sufficient to permit water to pass therethrough but insufficient to permit debris which is greater than about 1/16 inch to pass therethrough, each of said blocks having an upper surface upon which mortar and debris can collect, said bodies being emplaced within the cavity and at least some of said bodies resting on the wall base in alignment with and covering at least one respective opening and blocking the opening from debris, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls.Iadd., said upper surface having first and second horizontal surface portions exposed from above and located on at least two elevations.Iaddend..   
     
     
       19. A drainage system for use in a cavity wall construction having an inner wall, an outer wall, a wall base between the walls at the bottom of the cavity wall construction, and ties extending between and joining the walls above the base, with at least one channel formed in a wall through which channel water can drain from a channel opening communicating with a cavity defined between the walls comprising: a plurality of mortar and other debris blocking bodies, each of said bodies being horizontally elongated along a major length with a surface upon which mortar and debris can collect, made of non-water absorbent material formed into a water-permeable porous mass of randomly oriented passages which interrupt the downward movement of free-falling material, said porous mass having a porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and debris to pass therethrough, said bodies being emplaced within the cavity on the wall base in alignment with and covering at least one respective opening and blocking the opening from such mortar and debris, at least a portion of said bodies having a thickness dimension substantially the same as the cavity between said inner and outer walls.Iadd., said surface having first and second horizontal surface portions exposed from above and located on at least two elevations.Iaddend..   
     
     
       20. A debris collection device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed therein adjacent a cavity wall base through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a plurality of screens, each said screen having a porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and other debris having a size greater than about 1/16 inch to pass therethrough,   and means for organizing said screens in overlapping arrangement in a plurality of generally parallel planes with screens in one or more of said planes being spaced one from another, said screen so organized giving the debris collection device a thickness at least as great as the horizontal distance between the inner and outer walls at the cavity wall base and defining a volume for the debris collection device, said screens being overlapped such that a vertical line perpendicular to said planes through said volume must intersect at least one screen, whereby mortar and other debris falling under the influence of gravity within the cavity and into said volume must contact at least one such screen.   
     
     
       21. The collection device of claim 20 further including a wick for wicking water extending through the weep hole into the cavity. 
     
     
       22. A mortar collecting device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a supporting member having a lateral face, said supporting member having a vertical height and longitudinal length adapted to yield an area greater than that of at least one such channel opening,   a plurality of projections extending from said lateral face, said projections being provided in staggered arrangement such that a vertical line extending parallel to said lateral face will contact at least one such projection, thereby forming a circuitous path for debris passing along said lateral face,   whereby said collecting device when emplaced within the cavity with said projections overlying at least one such channel opening serves to prevent debris from plugging the channel opening.   
     
     
       23. The collecting device of claim 22 wherein said support member is a backing board having a planar lateral face, and said projections are adapted to extend across the cavity and contact one wall with said backing board abutting the other wall. 
     
     
       24. The collecting device of claim 20 wherein said projections are flexible. 
     
     
       25. The collecting device of claim 20 wherein said projections are resilient. 
     
     
       26. A mortar collecting device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a supporting member having two lateral side faces, said supporting member having a vertical height and longitudinal length adapted to yield an area greater than that of at least one such channel opening,   a plurality of projections extending outwardly from each said side lateral face, said projections being provided in staggered arrangement such that a vertical line extending parallel to each said side lateral face will contact at least one such projection, thereby forming a circuitous path for debris passing along each said side lateral face,   whereby said collecting device when emplaced within the cavity with said projections overlying at least one such channel opening serves to prevent debris from plugging the channel opening.   
     
     
       27. The collection device of claim 26 wherein said body is elongated with a horizontal long axis, and further includes reinforcing means affixed to said body and extending parallel to said long axis for adding rigidity against bending along said long axis. 
     
     
       28. A mortar collecting device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a pair of opposed supporting members each having a lateral face, each said supporting member having a vertical height and longitudinal length adapted to yield an area greater than that of at least one such channel opening,   a plurality of projections extending between said lateral faces, said projections being provided in staggered arrangement such that a vertical line extending parallel to each said side lateral face will contact at least one such projection, thereby forming a circuitous path for debris passing between said opposed supporting members along a lateral face,   whereby said collecting device when emplaced within the cavity overlying at least one such channel opening serves to prevent debris from plugging the channel opening.   
     
     
       29. A mortar collecting device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed therein adjacent a cavity bottom through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a water permeable body positioned in alignment with at least some of said weep hole openings, said body having non-linear water pathways formed therein which interrupt the downward movement of free-falling material and yielding a porosity sufficient to permit water to pass therethrough, said body having a horizontal axis relative to the cavity bottom, said body further including a layer of material extending along said horizontal axis which material passes water therethrough, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls.Iadd., said body having a plurality of upwardly facing first surfaces formed thereon that are separated by first horizontal spaces, and a plurality of upwardly facing second surfaces formed thereon that are separated by second horizontal spaces, said second surfaces elevated from said first surfaces, at least some of said first surfaces being disposed in vertical alignment with some of said second horizontal spaces between said second surfaces, whereby mortar and other debris falling under the influence of gravity within said cavity contacts at least one of said first and second surfaces.Iaddend..   
     
     
       30. .[.The collecting device of claim 29.]. .Iadd.A mortar collecting device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed therein adjacent a cavity bottom through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a water permeable body positioned in alignment with at least some of said weep hole openings, said body having non-linear water pathways formed therein which interrupt the downward movement of free falling material and yielding a porosity sufficient to permit water to pass therethrough, said body having a horizontal axis relative to the cavity bottom, said body further including a layer of material extending along said horizontal axis which material passes water therethrough, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls, .Iaddend.wherein said body has an upper surface including upwardly extending protrusions to prevent ponding of material falling on said upper surface.   
     
     
       31. The collecting device of claim 30 wherein said body is comprised of randomly oriented nonabsorbent fibrous material formed into a water permeable porous mass, said body having a porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and other debris having a size greater than about 1/16 inch to pass therethrough, said body having a height and width sized to cover at least one of the weep hole openings. 
     
     
       32. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body having circuitous non-linear pathways therethrough extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is substantially prevented from passing therethrough, said body being elongated along a long axis and having an upper surface with a non-planar contour along said long axis, and flashing affixed to said body along a body bottom which is opposite to said upper surface and generally parallel to said long axis.   
     
     
       33. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body having circuitous non-linear pathways therethrough extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pas therethrough, but mortar and other debris is substantially prevented from passing therethrough, said body being elongated along a long axis and having a horizontal thickness defined perpendicular to said long axis, said body also having an upper surface with a non-planar contour of stepped configuration along said upper surface.   
     
     
       34. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed therein through which weep holes water can drain from a weep hole opening communicating with a cavity defined between the walls, comprising: a water-permeable porous body of non-water absorbent randomly oriented fibrous material having a porosity sufficient to permit water to pass therethrough,   said body having an upper surface including upwardly extending protrusions which define overhangs along said upper surface to provide gaps in material collected on said upper surface.   
     
     
       35. A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with weep holes formed through a wall through which weep holes water can drain from a weep hole opening communicating along with a cavity defined between the inner and outer walls, comprising: a body of randomly oriented non-water absorbent fibrous material formed into a water-permeable porous mass, said body having a porosity sufficient to permit water to pass therethrough but substantially insufficient to permit mortar and debris to pass therethrough, said body having a height, and width sized to cover at least one of the weep hole openings, a wick for wicking water extending from said body at a body bottom, said wick adapted to fit within the weep hole, and flashing attached to said body bottom.   
     
     
       36. A drainage system for use in a cavity wall construction having an inner wall, an outer wall, a wall base between the walls at the bottom of the cavity wall construction, and ties extending between and joining the walls above the base, with at least one channel formed in a wall through which channel water can drain from a channel opening communicating with a cavity defined between the walls comprising: a plurality of mortar and other debris blocking bodies, each of said bodies being made of non-water absorbent material formed into a water-permeable porous mass of randomly oriented passages, said porous mass having porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and debris to pass therethrough, said bodies being emplaced within the cavity on the wall base covering at least one respectively opening and blocking the opening from such mortar and debris, said bodies having a thickness at least as great as the distance between the inner and outer walls at the wall base, with each said bodies freely resting on one or more of the wall base and ties.   
     
     
       37. A drainage system for use in a cavity wall construction having an inner wall, an outer wall, a wall base between the walls at the bottom of the cavity wall construction, and ties extending between and joining the walls above the base, with at least one channel formed in a wall through which channel water can drain from a channel opening communicating with a cavity defined between the walls comprising: a plurality of mortar and other debris blocking bodies, each of said bodies being made of non-water absorbent material formed into a water-permeable porous mass of randomly oriented passages, said porous mass having a porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and debris to pass therethrough, said bodies being emplaced within the cavity on the wall base covering at least one respective opening and blocking the opening from such mortar and debris, at least some of said bodies being elongated along a major length and include a reinforcing rod extending along said major length to provide further rigidity to said body, as for supporting said body between ties in the cavity. .Iadd.   
     
     
       38.  The collection device of claim 1 wherein said upwardly facing first and second surfaces are oriented in vertically and horizontally spaced apart rows..Iaddend..Iadd.39. The collection device of claim 1 wherein said body includes first and second screen portions, and wherein said first surfaces are formed on said first screen portions, said first surfaces disposed generally along a first substantially horizontal plane; and said second surfaces are formed on said second screen portions, said second screen portions having a bottom surface facing downwardly and disposed generally along a second substantially horizontal plane, said first and second substantially horizontal planes being separated by a vertical space..Iaddend..Iadd.40. The collection device of claim 39 wherein said first and second screen portions have a horizontal thickness dimension substantially the same as the cavity between said inner and outer walls..Iaddend..Iadd.41. The collection device of claim 39 wherein said first and second surfaces are substantially horizontally oriented..Iaddend..Iadd.42. The collection device of claim 39 wherein said first screen portions are arranged spaced apart along the horizontal direction, and said second screen portions are arranged spaced apart along the horizontal direction, said first screen portions are each arranged to have at least a portion of a respective first surface located along the horizontal direction between two adjacent ones of said second screen portions..Iaddend..Iadd.43. The collection device of claim 42 further comprising a plurality of third screen portions spaced apart along the horizontal direction and located at a lower elevation than said first screen portions, said third screen portions include a third upwardly facing surface, said third screen portions are arranged to have at least a portion of a respective third surface located along the horizontal direction between two adjacent ones of said first screen portions..Iaddend..Iadd.44. The collection device of claim 43 wherein said first screen portions include a bottom surface arranged generally along a third horizontal plane, and said third upwardly facing surfaces of said third screen portions are arranged generally along a fourth horizontal plane, said third horizontal plane and said fourth horizontal plane being   
     
     
        separated by a further vertical space..Iaddend..Iadd.45.  The collection device of claim 44 wherein said first, second and third screen portions are formed by random-fiber, fibrous material..Iaddend..Iadd.46. The collection device of claim 1 wherein said body includes first and second screen portions, and wherein said first surfaces are formed on said first screen portions, said first surfaces disposed generally along a first substantially horizontal plane; and said second surfaces are formed on said second screen portions, said second screen portions having a bottom surface facing downwardly and disposed generally along a second substantially horizontal plane, said first and second substantially horizontal planes being separated by a vertical space;   wherein said first and second screen portions have a horizontal thickness dimension substantially the same as the cavity between said inner and outer walls;   wherein said first and second surfaces are substantially horizontally oriented;   wherein said first screen portions are arranged spaced apart along the horizontal direction, and said second screen portions are arranged spaced apart along the horizontal direction, said first screen portions are each arranged to have at least a portion of a respective first surface located along the horizontal direction between two adjacent ones of said second screen portions;   and comprising a plurality of third screen portions spaced apart along the horizontal direction and located at a lower elevation than said first screen portions, said third screen portions include a third upwardly facing surface, said third screen portions are arranged to have at least a portion of a respective third surface located along the horizontal direction between two adjacent ones of said first screen portions;   wherein said first screen portions include a bottom surface arranged generally along a third horizontal plane, an said third upwardly facing surfaces of said third screen portions are arranged generally along a fourth horizontal plane, said third horizontal plane and said fourth horizontal plane being separated by a further vertical space; and   wherein said first, second and third screen portions are formed by   
     
     
        random-fiber, fibrous material..Iaddend..Iadd.47.  The collection device of claim 1 wherein said body includes first and second screen portions, and wherein said first surfaces are formed on said first screen portions, said first surfaces disposed generally along a first substantially horizontal plane; and said second surfaces are formed on said second screen portions, said second screen portions having a bottom surface facing downwardly and disposed generally along a second substantially horizontal plane, said first and second substantially horizontal planes being separated by a vertical space; and   said first and second screen portions are formed by random-fiber, fibrous material..Iaddend..Iadd.48. The collection device of claim 1 wherein said body includes a plurality of third upwardly facing surfaces, said third upwardly facing surfaces located on an elevation below said first and second upwardly facing surfaces..Iaddend..Iadd.49. The collection device of claim 1 wherein said body includes first and second screen portions, and wherein said first surfaces are formed on said first screen portions; and   said second surfaces are formed on said second screen portions,   wherein said first screen portions are arranged spaced apart along the horizontal direction, and said second screen portions are arranged spaced apart along the horizontal direction, said first screen portions are each arranged to have at least a portion of a respective first surface located along the horizontal direction between two adjacent ones of said second screen portions;   and a plurality of third screen portions spaced apart along the horizontal direction and located at a lower elevation than said first screen portions, said third screen portions include a third upwardly facing surface, said third screen portions are arranged to have at least a portion of a respective third surface located along the horizontal direction between two adjacent ones of said first screen   
     
     
        portions..Iaddend..Iadd.50.  A mortar and debris collection device for use in a cavity wall construction having an inner wall and an outer wall with channels formed therein through which channels water can drain from a channel opening communicating with a cavity defined between the walls, comprising: a water-permeable body positioned in alignment with at least some of said channels openings, said body having circuitous non-linear pathways therethrough which interrupt the downward movement of free-falling material and extending from an upper surface upon which water and debris can fall, and yielding a porosity for said body sufficient to permit water to pass therethrough, but mortar and other debris is substantially prevented from passing therethrough, at least a portion of said body having a thickness dimension substantially the same as the cavity between said inner and outer walls, said body having a plurality of upwardly facing surfaces formed thereon that are separated by horizontal spaces, whereby mortar and other debris falling under the influence of gravity within said cavity can contact one of said upwardly facing surfaces or fall through one of said horizontal spaces..Iaddend.