Beware of icicles hanging from your roofline

ice dam.tif

Northeast News
February 11, 2014

Icicles may look pretty, but if they’re hanging from your home, be wary.

If icicles are hanging from your roof, it could be a sign of ice dams which can cause interior and exterior damage to your home.

“Eventually this dam forces the water to back up under the shingles and sometimes into the ceiling or wall inside the home,” said Bob Schultheis, natural resource engineering specialist with the University of Missouri Extension.

Ice dams can lead to dislodged roof shingles, sagging gutters, damaged insulation and water stains on interior ceilings and walls. Water from ice dams may also cause structural framing members to decay, metal fasteners to corrode, and mold and mildew to form in attics and on walls.

Ice dams are caused by nonuniform roof temperatures, Schultheis said.  

“In the winter, when warm air inside the house leaks into the unheated attic, it creates warm areas on the roof,” he said.

Melting snow on the roof flows down the roof slope until it reaches the cold overhang, where it refreezes. As the process continues, ice builds up along the eaves and forms a dam.

The best way to prevent ice dams is to control heat loss from your home, he said.

“In the short-term, remove snow from the roof using a roof rake or push broom, but take care not to damage the roofing materials. Doing this work on or below the roof can be very dangerous, and it’s a job best left to the professionals,” Schultheis said.

Another short-term solution is to stop water from flowing into the structure. Schultheis recommends making channels through the ice dam by using a hose with warm tap water. Work up from the lower edge of the dam and the channel will become ineffective within days.

For the long-term, Schultheis recommends increasing the ceiling and roof insulation in your home to R-38 to reduce heat loss. Also, ensure the ceiling is airtight so warm air cannot flow from the house into the attic space. To accomplish this, plug the gaps around plumbing vents, wiring, recessed lights and chimneys.

“Keep the attic cold by providing at least two square feet of attic vent for each 150 square feet of attic area,” he said. “Where the roof rafters meet the walls at the eaves, provide a 1-inch clearance between the roof sheathing and the ceiling insulation to allow ventilation.”

 

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