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0007 Preventing Ice Dams with Ventilation - Roofing - General
 
0007 Preventing Ice Dams with Ventilation - Roofing - General -

Image Text: No ventilation: cold roof > trapped water > ice dam > no soffit vent > warm roof > 25 degrees Fahrenheit > snow melts and runs down roof > 45 degrees Fahrenheit > insulation > backed-up water gets into house > escaping heat > wall > 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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