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A drainage mat for use in building structures, particularly in exterior walls and roofing, to improve drainage and ventilation within such structures. The drainage mat includes a web of extruded polymer monofilaments that are heat welded at junctions to form a matrix of tangled monofilaments. The we

A drainage mat for use in building structures, particularly in exterior walls and roofing, to improve drainage and ventilation within such structures. The drainage mat includes a web of extruded polymer monofilaments that are heat welded at junctions to form a matrix of tangled monofilaments. The web includes on its front face an alternating array of ridges and planar regions, each ridge having a substantially trapezoidal shape with a top surface and a base, the width of the top surface being less than the width of the base.

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1. A drainage mat comprising: a web of extruded polymer monofilaments, the polymer monofilaments being heat welded at junctions to form a matrix of tangled monofilaments, the web having a front face, a rear face, a top edge and a bottom edge, and a pair of side edges, the web configured to have a pl

1. A drainage mat comprising: a web of extruded polymer monofilaments, the polymer monofilaments being heat welded at junctions to form a matrix of tangled monofilaments, the web having a front face, a rear face, a top edge and a bottom edge, and a pair of side edges, the web configured to have a plurality of alternating rows of ridges and planar regions, each ridge configured to form an open elongated channel extending from the top edge to the bottom edge, each ridge having a substantially elongated trapezoidal shape with a top surface and a base, the width of the top surface being less than the width of the base. 2. The drainage mat of claim 1, wherein the width of the top surface of the ridges is less than the width of the planar regions. 3. The drainage mat of claim 1, wherein at least one of the ridges has a planar top surface. 4. The drainage mat of claim 1, wherein at least one of the ridges has a dome shaped top surface. 5. The drainage mat of claim 1 wherein the polymer monofilaments are made of a material selected from polyolefin, polyamide, polyester, polyvinylhalide, polystyrene, polyvinylester and a mixture of two or more thereof. 6. The drainage mat of claim 1 wherein the polymer monofilaments are made of a material selected from polyethylene, polypropylene, and a mixture thereof. 7. The drainage mat of claim 1 wherein the polymer monofilaments have an average diameter in the range from about 1 to about 4 mils. 8. The drainage mat of claim 1 further comprising a waterproof membrane bonded to the front face of the web. 9. The drainage mat of claim 1 wherein at least one of the side edges of the web has an entangled filament hook. 10. The drainage mat of claim 1 wherein the top edge of the web is cut at an angle and the bottom edge of the web is cut at a supplementary angle. 11. The drainage mat of claim 1 wherein the front face of the web is bonded to an insulation board having the same dimensions as the monofilament web. 12. The drainage mat of claim 1 further comprising a fabric layer heat bonded to the rear face of the web. 13. The drainage mat of claim 12 wherein the fabric layer comprises a plurality of fiberglass strands. 14. The drainage mat of claim 12 wherein the fabric layer includes at least one selvedge edge that extends beyond at least one of the side edges of the web. 15. The drainage mat of claim 12 further comprising a waterproof membrane bonded to the front face of the web. 16. A drainage system comprising at least two adjacent drainage mats in accordance with claim 1. 17. The drainage system of claim 16 wherein the at least two adjacent drainage mats each have an interlocking side edge member.