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A composite building material for preventing water and moisture from remaining trapped within walls and roofs of building which includes a weather barrier fixedly attached to a three-dimensional matrix filamentous mat manufactured of a polymeric material. The mat contains a great number of voids for

A composite building material for preventing water and moisture from remaining trapped within walls and roofs of building which includes a weather barrier fixedly attached to a three-dimensional matrix filamentous mat manufactured of a polymeric material. The mat contains a great number of voids for permitting gas and liquid such as water to flow therethrough. The mat possesses a crush-resistance which allows the mat to withstand the compressive of other building materials without inhibiting the ability of the mat to allow liquids and gases to flow therethrough.

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1. A method for constructing a building structure comprising:providing a plurality of spaced studs;securing a sheathing to the studs;providing a composite building material comprising an integral unitary member including a polymeric weather barrier, a mat formed of an open, three dimensional matrix

1. A method for constructing a building structure comprising:providing a plurality of spaced studs;securing a sheathing to the studs;providing a composite building material comprising an integral unitary member including a polymeric weather barrier, a mat formed of an open, three dimensional matrix of plastic filaments formed in an overlapping irregular looped and intermingled fashion and a securement means for attaching the mat to the weather barrier,securing the composite building material to said sheathing; andsecuring an external covering to the studs with the composite building material being sandwiched between said sheathing and external covering. 2. The method of claim 1 including securing the composite building material to the sheathing with penetrating fasteners. 3. The method of claim 2 in which the penetrating fasteners are nails or staples. 4. The method of claim 1, wherein the building structure is a wall and the studs extend vertically; in which the composite building material is an elongated strip having a greater length than width and having a longitudinal axis; and in which the length of said material extends perpendicular to the vertical studs. 5. The method of claim 4 including overlapping longitudinal edges of adjacent strips of the composite building material wherein an upper weather barrier overlaps an adjacent lower weather barrier. 6. The method of claim 4 including providing the composite building material with spaced parallel strips of an adhesive to secure the plastic filaments to the weather barrier, and wherein said strips extend substantially perpendicular to the longitudinal axis of said building material. 7. The method of claim 1 including providing an elongated edge of the composite building material free of the plastic filaments. 8. The method of claim 1 including forming the weather barrier of a sheet of non-woven polymeric fibers. 9. The method of claim 1 wherein the building structure is a roof and the sheathing is the roof deck and the external covering is a plurality of shingles. 10. The method of claim 1, wherein said securement means is selected from the group consisting of (i) a plurality of spaced adhesive spots (ii) a plurality of substantially parallel adhesive strips and (iii) a lamination. 11. The method of claim 10, wherein said securement means is a plurality of spaced adhesive spots. 12. The method of claim 1, wherein the adhesive is a plurality of substantially parallel adhesive strips. 13. The method of claim 12, wherein said composite building material is an elongated strip having a longitudinal axis; and in which the adhesive strips extend generally perpendicular to said longitudinal axis. 14. The method of claim 10, wherein the securement means is a lamination. 15. A building structure comprising:a framed wall comprising a plurality of spaced studs;a composite building material comprising an integral unitary member including a polymeric weather barrier, a mat formed of an open, three dimensional matrix of plastic filaments formed in an overlapping irregular looped and intermingled fashion and a securement means for attaching the drainage mat to the weather barrier, wherein said building material is fixedly attached to said spaced studs; andan external covering fixedly attached to said spaced studs with the composite building material being disposed between said framed wall and external covering. 16. The building structure of claim 15, wherein said mat is selectively detachable from said weather barrier, said mat and said weather barrier remaining undamaged after said mat is detached from said weather barrier. 17. The building structure of claim 15, wherein the weather barrier comprises a non-woven sheet of spun-bonded olefin fibers. 18. The building structure of claim 15, wherein the olefin fibers are selected from the group consisting of polypropylene fibers and high density polyethylene fibers. 19. The composite building material of claim 18, wherein the olefin fibers a re high density polyethylene fibers. 20. The building structure of claim 15, wherein the plastic filaments of the mat are nylon. 21. The building structure of claim 20, wherein the nylon filaments are nylon 6 . 22. The building structure of claim 15, wherein said securement means is selected from the group consisting of (i) a plurality of spaced adhesive spots (ii) a plurality of substantially parallel adhesive strips and (iii) a lamination. 23. The building structure of claim 22, wherein said securement means is a plurality of spaced adhesive spots. 24. The building structure of claim 15, wherein the adhesive is plurality of substantially parallel strips. 25. The building structure of claim 24, wherein said composite building material is an elongated strip having a longitudinal axis; and in which the adhesive strips extend generally perpendicular to said longitudinal axis. 26. The building structure of claim 15, wherein the securement means is a lamination. 27. A method for constructing a building structure comprising:forming a framed wall with a plurality of spaced studs;providing a composite building material comprising an integral unitary member including a polymeric weather barrier, a mat formed of an open, three dimensional matrix of plastic filaments formed in an overlapping irregular looped and intermingled fashion and a securement means for attaching the drainage mat to the weather barrier,securing the composite building material to said spaced studs of said framed wall; andsecuring an external covering to the studs with the composite building material being disposed between said framed wall and external covering.