WATER Pot otential Damage ial Damage


1. Water Damage — Ice stored above the roof gets in contact with warm air from inside the house and melts. The resulting water can cause damage to ceilings,   even siding can suffer water damage. If gutters are damaged, chances are high that water has leaked through walls.


2. Organic Growth— Water that sits for extended periods of time can result in organic growth.


3. Roof Damage — As ice backs up under the shingles, they can get damaged or even torn off.


COLD HERE


4. Gutter Damage — Ice dams are notorious for causing gutters to rip right off the house. Gutters often get warped and bent out of shape from supporting ice dams all winter.


ICE DAM ICE DAM


ICE MELTS TO WATER ENTERING ROOF SHINGLES AND UNDERLAYMENT


SNOW MELTS FROM HEAT IN ATTIC SPACE AND RUNS OFF THE ROOF


SNOW MELTS FROM HEAT IN


ATTIC SPACE AND RUNS OFF THE ROOF


WATER GUTTER HEAT ESCAPES


WALL CAVITY


WARM HERE How an Ice Dam Forms on a Roof


Ice dams are notorious for causing gutters to rip right off the house.


Where Do Ice Dams Occur?


Ice dams are a concern in colder climates where heavy snowfall is prevalent. Many factors can contribute to ice damming, and in some cases and locations, their formation is almost impossible to stop.


Hot Attic Ice Dams are the most common type of ice dam. Below are a few reasons why they form:


 Discontinuous Thermal Boundary — levels or discontinuous attic insulation will allow warm, 


 Discontinuous Pressure Boundary — Conditioned air is introduced into the attic space by  interior and exterior walls, and chases that have not been made airtight.


An ice dam like this can damage the roof and gutters. It also poses the potential hazard of falling ice.


  — HVAC ducts that are non-insulated can leak heated air. Kitchen, bathroom, and dryer vents not taped and sealed at the roof deck can introduce warm, moisture-laden air.


 Inadequate Attic Ventilation — Inhibits the ability of the roof deck to draw cool outside air into the space and help cool down the roof deck.


Continued On Page 24  wscai.org 23


INSULATION DRYWALL


BELOW 32 DEGREES


ES


ABOVE 32 DEGREES


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