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Ice Dam Explanation
How Ice Dams Form
The outside air temperature is below 32 degrees.Warm air escaping from the interior of the home enters the attic and warms the underside of the roof.
The warmed roof melts the underside of the snow blanket. The melted snow turns to water and runs down the roof shingles until it reaches the non-heated area of the roof, the exterior overhangs. Here the water refreezes and forms an ice dam.
Melted water continues to run down from above.The water begins to pool behind the dam and backs up under the roofing shingles. At this point it penetrates the roof decking, entering the interior of the home and wall cavities and begins to cause damage. |
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Signs of Ice Damming
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Interior water stains in the attic along the lowest part of the roof just before the overhangs
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Icicles hanging over gutters and or against the siding from under the soffits. |
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Wet or frozen decking or rafters in the attic where the roof intersects with the exterior walls. |
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Stained, blistered, and peeling siding |
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Soaked, rotting, and peeling soffits and fascia boards |
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Water stains on ceilings and walls along the exterior of the house |
How To Prevent Ice Dam Damage
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Be sure to have a preminum ice and water barrier properly installed during a roof replacement.This will help prevent ice dam damage.
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Keeping the attic well ventilated will help prevent ice dams in the winter. The colder the attic is the better.
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Be sure to seal all gaps and spaces and properly insulate your attic. This will prevent the heat in your home from rising up into the attic and warming the underside of the roof.
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Call now to schedule an appointment for a free
estimate
(718) 816-7663
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