Drainage and ventilation mat for building exterior wall, roof and basement assemblies

A drainage and ventilation mat for use in building construction, the mat adapted to be placed in a space between a building substrate and a building outer layer of material, comprising

• a. a first layer of stranded material, the first layer of stranded material having a plurality of strands disposed a predetermined distance apart and parallel to each other;
• b. a second layer of stranded material, the second layer of stranded material having a plurality of strands disposed a predetermined distance apart and parallel to each other, the second layer of stranded material being overlaid on and bonded to the first layer of stranded material so that the stands are angled and form at least one vertex oriented vertically downwardly, and whereby the first and second layers define a netting arrangement with parallelogram shaped apertures including the downwardly oriented vertex, the netting arrangement being disposed between a building substrate and a building outer layer;
• c. the first and second layers of stranded material each having a square cross-sectional geometry;
• d. at least one scrim layer disposed on and parallel to the first and second layers of stranded material;
• and
• e. whereby the mat provides moisture drainage towards the downwardly oriented vertices and air movement between the building substrate and the building outer layer, the netting arrangement being resistant to compression by the building substrate and the building outer layer to form and maintain an airspace between the building substrate and the building outer layer.

A drainage and ventilation mat for use in building construction, the mat adapted to be placed in a space between a building substrate and a building outer layer of material, comprising

• a. a first layer of extruded high density polyethylene plastic stranded material, the first layer of stranded material having a plurality of strands disposed a predetermined distance apart and parallel to each other, each strand having a square crossection;
• b. a second layer of extruded plastic stranded material, the second layer of stranded material having a plurality of strands, each having a square crossection and disposed a predetermined distance apart and parallel to each other, the second layer of stranded material being overlaid on and thermally bonded to the first layer of stranded material so that the stands are angled and form at least one vertex oriented vertically downwardly, and whereby the first and second layers define a netting arrangement with diamond shaped apertures, including the downwardly oriented vertex, the netting arrangement being disposed between a building substrate and a building outer layer, wherein the netting has a thickness of between 0.1875 and 0.25 inches, and wherein the square cross-sectional geometry of the strands in the netting arrangement provide a compressive strength such that the netting arrangement will maintain an airspace intact when compressed between the building substrate and the building outer layer;
• c. at least one scrim layer constructed of a fabric material, disposed on one side of the mat, parallel to the first and second layers of stranded material;
• d. at least one weather resistive barrier (WRB) disposed on the opposite side of the mat, and disposed towards the exterior of the building;
• and
• e. whereby the mat provides moisture drainage towards the downwardly oriented vertices and air movement between the building substrate and the building outer layer, the netting arrangement being resistant to compression by the building substrate and the building outer layer.