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1342 Preventing Ice Dams with Ventilation - Insulation Energy Efficiency - Venting Roofs
 
1342 Preventing Ice Dams with Ventilation - Insulation Energy Efficiency - Venting Roofs -

Image Text: Cross section > No ventilation > cold roof > trapped water > ice dam > no soffit vent  > wall > warm roof > 25 degrees Fahrenheit > snow melts and runs down roof > 45 degrees Fahrenheit > insulation > backed-up water gets into house > escaping heat > 75 degrees Fahrenheit > Ventilated > 25 degrees Fahrenheit > Ridge vent > snow on roof does not melt > air flow > 30 degrees Fahrenheit > Upgrade insulation if necessary > Keep air path open > Continuous soffit vent > gutter not shown > 75 degrees Fahrenheit > Note: ridge venting is more effective than individual upper level vents

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INSULATION

The Basics, Air/Vapor Barriers (Vapor Retarders), Venting Roofs, Venting Living Spaces, Attics, Flat and Cathedral Roofs, Walls Above Grade, Basements and Crawlspaces, Floors over Unheated Areas, Ventilation Systems

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