02/01/2013
Preventing Ice Dams
Winter weather in the Greater Toledo Area brings snow covered roofs, freezing temperatures, and snow melt that can cause damaging ice dams.
Ice-dam problems occur when melting snow pools behind dams of ice at the roof’s edge and leak into the home.
Some visible indications of problems caused by ice dams may include delaminated roof decks, water-stained ceilings, dislodged roof shingles, sagging ice-filled gutters, peeling paint, damaged plaster, mold and mildew, and wet wall and attic insulation.
Here are three tips for avoiding these frosty formations and the damage caused by them in typical roof/attic designs in our area:
1) Don't heat your roof, keep it cold! the underside of your roof should not exceed 30 degrees Fahrenheit in temperature.
2) Make sure your attic is adequately insulated, an air space between the roof deck and the insulation with proper attic ventilation in order to prevent a condensation buildup that can delaminate the roof deck.
3) Make sure your attic is adequately ventilated so that air flow is introduced into it to exhaust warm moist air rapidly that is typically generated from improperly sealed conditioned living spaces below. If adequate cross ventilated gable vents or ridge vents with soffit venting don't generate sufficient air movement to extract the heat and humidity escaping into the attic, adding motorized venting to the attic to exhaust the heat and humidity can be helpful to supplement attic ventilation, just as long as there is adequate make up air vents that generate flow into the attic from exterior air sources lower than the motorized exhaust vent fan location. Proper attic ventilation design is critical for proper function.
Consult with qualified building professionals for proper new design, and before implementing any changes to your existing design, or the problem could be exacerbated with improper design and implementation.
Just remember that ice dams and the damage that results from them is avoidable!
Tips 2 and 3 can also be benefical in helping reduce cooling bills in the warm and hot months.
More Helpful Links:
Assess Your Home’s Efficiency with an Energy Audit
http://www.nahb.org/generic.aspx?genericContentID=133