A venting arrangement for a roof includes a plurality of venting stacks each having a first open base end open to an area on top of the roof insulation layer and below the roof outer membrane, the venting stacks arranged spaced apart around a perimeter of the roof. A venting path grid of air permeab
A venting arrangement for a roof includes a plurality of venting stacks each having a first open base end open to an area on top of the roof insulation layer and below the roof outer membrane, the venting stacks arranged spaced apart around a perimeter of the roof. A venting path grid of air permeable material is arranged between the roof membrane and the insulation layer. The grid is in air flow communication with the first open base ends. Centrally located wind-driven turbine ventilators can also be in air flow communication to the grid.
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1. A venting arrangement for a roof, the roof having an insulation layer and a roof membrane on top of the insulation layer, the arrangement comprising: a first venting stack having a first open base end open to an area on the top of the insulation layer and below the roof membrane;a venting path of
1. A venting arrangement for a roof, the roof having an insulation layer and a roof membrane on top of the insulation layer, the arrangement comprising: a first venting stack having a first open base end open to an area on the top of the insulation layer and below the roof membrane;a venting path of air permeable open mesh fabric that allows air to pass horizontally and vertically through the fabric, the fabric arranged between the roof membrane and the insulation layer and in air flow communication at a first location to the first open base end of the first venting stack and extending to a second location away from the first venting stack; anda second venting stack having a second open base end open to the area on the top of the insulation layer and below the roof membrane, the venting path of air permeable open mesh fabric in air flow communication at the second location to the second open base end of the second venting stack;wherein the air permeable open mesh fabric comprises a matrix of interwoven tangled strands having mutually interconnected voids which provide a sufficient air permeability such that ambient air flow on the roof past the first or second venting stacks draws vapor through the venting path and creates a suction to urge the roof membrane down onto the insulation layer, and wherein the air permeable open mesh fabric does not transport said vapor by capillary action. 2. The venting arrangement according to claim 1 further comprising: a plurality of additional venting stacks each having a first open base end open to an area on top of the insulation layer and below the roof membrane, the additional venting stacks arranged spaced apart around a perimeter of the roof;a venting path grid of air permeable open mesh fabric arranged between the roof membrane and the insulation layer and in air flow communication to the first open base ends of the plurality of additional venting stacks and to the venting path. 3. The venting arrangement according to claim 1, comprising a first base mesh fabric supporting the first open base end and overlying the venting path and a second base mesh fabric supporting the second open base end and overlying the venting path. 4. The venting arrangement according to claim 1, wherein the open mesh fabric has a width of between 9 and 12 inches. 5. The venting arrangement according to claim 1 wherein the open mesh fabric comprises a thickness of between ⅞ and 1⅛ inches. 6. The venting arrangement according to claim 5 wherein the open mesh fabric has a width of between 9 and 12 inches. 7. The venting arrangement according to claim 1, wherein the second venting stack comprises a wind-driven turbine for drawing air up the second venting stack from the second open base end. 8. The venting arrangement according to claim 7, wherein the venting path of air permeable open mesh fabric extends from the second location away from the first location to a third location; and comprising a third venting stack having a third open base end open to the area on top of the insulation layer and below the roof membrane, the venting path of air permeable open mesh fabric open at the third location to the third open base end of the third venting stack. 9. The venting arrangement according to claim 8, wherein the first and second locations are adjacent opposite sides of the roof and the second location is in a central location of the roof. 10. A venting arrangement for a roof, the roof having an insulation layer and a roof membrane on top of the insulation layer, the arrangement comprising: a plurality of perimeter venting stacks arranged spaced-apart around a perimeter of the roof, each perimeter venting stack having a first open base end that is open to an area on the top of the insulation layer and below the roof membrane; anda plurality of venting paths forming a grid on the roof, each venting path comprising air permeable open mesh fabric that allows air to pass horizontally and vertically through the fabric, the fabric arranged between the roof membrane and the insulation layer and extending lengthwise or widthwise across the roof and open at opposite ends to first open base ends of the perimeter venting stacks located adjacent to opposite sides of the roof;wherein the air permeable open mesh fabric comprises a matrix of interwoven tangled strands having mutually interconnected voids which provide a sufficient air permeability such that ambient air flow on the roof past one of the plurality of venting stacks draws vapor through a respective said venting path and creates a suction to urge the roof membrane down onto the insulation layer, and wherein the air permeable open mesh fabric does not transport said vapor by capillary action. 11. The venting arrangement according to claim 10, wherein the open mesh fabric has a width of between 9 and 12 inches. 12. The venting arrangement according to claim 10, further comprising intermediate venting stacks located at intermediate positions along each venting path, each intermediate venting stack having a second open base end that is open to an area on top of the insulation layer and below the roof membrane. 13. The venting arrangement according to claim 12, wherein each intermediate venting stack comprises a wind driven impeller for drawing air up the intermediate venting stack from the second open base end. 14. The venting arrangement according to claim 10, wherein each venting stack is supported on a base mesh fabric that overlies a venting path. 15. The venting arrangement according to claim 14, wherein each base mesh fabric has an outer perimeter greater than the perimeter of the respective first open base end that is supported on the base mesh fabric. 16. The venting arrangement according to claim 15, wherein each base mesh fabric has a widthwise dimension of about 2 feet. 17. A venting arrangement for a roof, the roof having an insulation layer and a roof membrane on top of the insulation layer, the arrangement comprising: a plurality of perimeter venting stacks arranged spaced-apart around a perimeter of the roof, each perimeter venting stack having a first open base end that is open to an area on the top of the insulation layer and below the roof membrane;a plurality of venting paths forming a grid on the roof, each venting path comprising air permeable open mesh fabric that allows air to pass horizontally and vertically through the open mesh fabric, the open mesh fabric arranged between the roof membrane and the insulation layer and extending lengthwise or widthwise across the roof and open at opposite ends to first open base ends of the perimeter venting stacks located adjacent to opposite sides of the roof;wherein each venting stack is supported on a base mesh fabric that allows air to pass vertically through the base mesh fabric that overlies a respective said venting path;wherein each base mesh fabric has an outer perimeter greater than the perimeter of the respective first open base end that is supported on the base mesh fabric;wherein the air permeable open mesh fabric comprises a matrix of interwoven tangled strands having mutually interconnected voids which provide a sufficient air permeability such that ambient air flow on the roof past one of the plurality of venting stacks draws vapor through the respective venting path and creates a suction to urge the roof membrane down onto the insulation layer, and wherein the air permeable open mesh fabric does not transport said vapor by capillary action. 18. The venting arrangement according to claim 17, wherein each base mesh fabric has a widthwise dimension of about 2 feet.
Jones, James R.; Telionis, Demetri; Vlachos, Pavlos; Grant, Elizabeth; Rullan, Jose; Johnson, Charles S., Rooftop vent for reducing pressure under a membrane roof.
Ballard James W. (Livonia MI) Ballard Larry R. (Redford Township ; Wayne County MI), Ventilator having insert for controlling moisture and method of making same.
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