When the upper portion of a roof is warm enough to melt snow and the eaves below are cold enough to freeze the runoff, an ice dam is born.
So What IS an Ice Dam?
Ice dams are ridges of ice that form along the bottom edge of a roof due to unvented heat loss inside a home’s attic space. If snow continues to melt, water will then begin to pool behind the ice dam. Excess water running over the edge of the dam may form icicles.
But more problematic is trapped water that migrates back up the roof and under the shingles. This leaves the roof susceptible to leaks, rotting, mold, ruined insulation and structural problems.
The Solution to an Ice Dam
The best way to permanently prevent an ice dam from forming is to have a well-insulated attic floor. This, combined with adequate attic ventilation, keeps the surface temperature of the roof consistent – called a “cold roof.”
Homeowners should also check the attic floor for cracks, holes and gaps around ductwork. This is where warm air from below can enter. Sealing attic floor cracks with spray foam or a similar product will fix this problem.
With adequate insulation levels, no air leaks and a well-vented attic, your attic will stay cold enough to prevent ice dams. As a bonus, you’ll also save on heating costs and minimize any possible condensation in your attic during the winter months. In the summer, your top floor interior spaces will be cooler and more comfortable.
For more information about preventing ice dams, or to schedule a professional inspection of your roof and attic space to determine if roof repair is necessary, call the Central Ohio roofing experts at Muth & Company at (614) 682-3060.